kimia k123 f4 2010

SULIT 4541/1

4541/1 ©2010 Hak Cipta Jabatan Pelajaran Melaka [Lihat sebelahSULIT

PEPERIKSAAN AKHIR TAHUNTINGKATAN 4, 2010

KIMIAKERTAS 1

Oktober

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Kertas soalan ini mengandungi 50 soalan.

2. Jawab semua soalan.

3. Jawab dengan menghitamkan ruangan yang betul pada kertas jawapan.

4. Hitamkan satu ruangan sahaja bagi setiap jawapan.

5. Rajah tidak dilukis mengikut skala kecuali dinyatakan.

6. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan.

Kertas soalan ini mengandungi 26 halaman bercetak

1¼ jam Satu jam lima belas minit

4541/1 PEPERIKSAAN SELARAS AKHIR TAHUN TINGKATAN 4Chemistry MATAPELAJARAN SAINS DAN MATEMATIKPaper 1 SEKOLAH-SEKOLAH MENENGAHOctober 2010 NEGERI MELAKA 2010

1 1/4 hours ______________________________________

KelolaanPEJABAT PELAJARAN DAERAH

MELAKA TENGAH*ALOR GAJAH*JASIN

Dengan kerjasamaJABATAN PELAJARAN MELAKA

JALAN ISTANA ,BUKIT BERUANG,MELAKA

CHEMISTRY

Kertas 1

Satu jam lima belas minit



2. Jawab semua soalan.


4. Hitamkan satu ruangan sahaja bagi setiap soalan.

5. Rajah tidak dilukis mengikut skala kecuali dinyatakan

6. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan

Kertas soalan ini mengandungi 26 halaman bercetak.

SULIT 4541/1

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INFORMATION FOR CANDIDATES

1. This question paper consists of 50 questions.

2. Answer all questions.

3. Answer each question by blackening the correct space on the answer sheet.

4. Blacken only one space for each question.

5. If you wish to change your answer, erase the blackened mark that you have made.Then blacken the space for the new answer.

6. The diagrams in the questions provided are not drawn to scale unless stated.

7. You may use a non-programmable scientific calculator.

MAKLUMAT UNTUK CALON


2. Jawab semua soalan


4. Hitamkan satu ruangan sahaja bagi setiap soalan.

5. Sekiranya anda hendak menukarkan jawapan, padamkan tanda yang telah dibuat.Kemudian hitamkan jawapaan yang baru.

6. Rajah yang mengiringi soalan tidak dilukis mengikut skala kecuali dinyatakan.

6. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan

Question 1 to Question 50 are followed by four options A, B, C or D.Choose the best option for each question and blackened the corresponding space onthe objective answer sheet.

Bagi Soalan 1 hingga Soalan 50, tiap-tiap soalan diikuti oleh empat pilihan jawapan A, B, Cdan D. Pilih satu jawapan yang terbaik bagi tiap-tiap soalan dan hitamkan ruangan yangsepadan pada kertas jawapan objektif anda

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1 Which of the following substances is made up of atoms?Antara berikut, bahan yang manakah terdiri daripada atom?A

B

C

D

IronFerum

Oxygen gasGas oksigen

NaphthaleneNaftalena

Sodium chlorideNatrium klorida

2 Table 1 shows the characteristics of subatomic particle X.Jadual 1 menunjukkan sifat bagi zarah sub atom X.

Subatomic ParticlesZarah sub atom

Relative ChargeCas relative

Relative massJisim relatif

X +1 1Table 1

A

B

C

D

ElectronElektron

ProtonProton

NeutronNeutron

NucleusNukleus

3 Which of the following statements best explain the stability of inert gases?Antara pernyataan berikut yang manakah terbaik menerangkan kestabilan gas adi?A

B

C

D

Have octet electron arrangement except heliumMempunyai susunan elektron oktet kecuali helium

Can accept, lose or share electronBoleh terima, hilang atau kongsi elektron

Have 8 valence electronsMempunyai 8 elektron valens

Exists as polyatomic gasesWujud sebagai gas poliatom

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4 Diagram 1 shows part of the Periodic Table.Rajah 1 menunjukkan sebahagian daripada Jadual Berkala.

X

Diagram 1What is the electron arrangement of atoms of element X?Apakah susunan elektron bagi atom unsur X?

ABCD

2.62.82.8.62.8.8

5

What is the molecular formula of substance X?Apakah formula molekul bagi bahan X?

ABCD

C2H4

C2H6

C3H6

C3H8

6 Which compound has the empirical formula of CH2 O?Sebatian manakah yang mempunyai formula empirik CH2 O?

ABCD

HCOOHCH3 COOHCH3COOCH3

HCOOC2H5

The information of substance X is:Empirical formula is CH2

Relative Molecular Mass is 42

Maklumat bagi Bahan X adalah :Formula empirik CH2

Jisim Molekul Relatif 42

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8 Which of the following statements is true?Antara pernyataan berikut yang mana adalah benar?

A

B

C

D

1 mol of hydrogen gas contains 6.02 × 1023 atoms1 mol gas hidrogen mengandungi 6.02 x 1023 atom

1mol of magnesium contains 6.02 × 1023 molecules1mol magnesium mengandungi 6.02 × 1023 molekul

1 mol of hydrogen gas contains 6.02 x 10 23 molecules1 mol gas hidrogen mengandungi 6.02 x 10 23 molekul

1 mol sodium chloride solution occupies 22.4 dm3 at s.t.p1 mol larutan natrium klorida mengandungi isipadu 22.4 dm3 pada s.t.p

7 Diagram 2 shows the symbol for the element X.The letter used is not the actual symbol of the element.Rajah 2 menunjukkan simbol unsur X.Huruf yang digunakan bukan simbol sebenar unsur itu.

39

19

DIAGRAM 2RAJAH 2

Which of the following is true when chlorine gas reacts with X?Antara berikut,yang manakah benar apabila gas klorin bertindak balas dengan X?

A

B

C

D

One chlorine atom receives one electron from one atom X to form one chloride ionSatu atom klorin menerima satu elektron daripada satu atom X untuk membentuk satuion klorida

Covalent bond is formedIkatan kovalen dibentuk

Chlorine atom donates 7 electrons to one atom XAtom klorin menderma 7 elektron kepada satu atom X

The molecular formula of the compound formed is XCl2

Formula molekul bagi sebatian yang terbentuk ialah XCl2

x

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9 Table 2 shows the proton number of elements P and QJadual 2 menunjukkan nombor proton bagi unsur P dan Q

ElementUnsur

Proton numberNombor proton

PQ

1117

TABLE 2

Which of the following statements are true for the elements in Table 2?Antara pernyataan berikut, yang manakah adalah betul bagi unsur-unsur didalam Jadual 2?

I

II

III

IV

A

B

C

D

Q is more electronegative than PQ adalah lebih elektronegatif dari P

The atomic size of P is bigger than QSaiz atom P adalah lebih besar dari Q

Elements P and Q can conduct electricityUnsur-unsur P dan Q boleh mengalirkan elektrik

P and Q are in the same period in the Periodic Table of ElementsP dan Q berada dalam kala yang sama dalam Jadual Berkala Unsur

I and III onlyI dan III sahaja

II and IV onlyII dan IV sahaja

I, II and IV onlyI, II dan IV sahaja

II, III and IV onlyII, III dan IV sahaja

10 What is the percentage of nitrogen by mass in ammonium nitrate, NH4NO3?Apakah peratus nitrogen dalam ammonium nitrat NH4NO3 mengikut jisim?[ Relative atomic mass:H= 1, N = 14 ,O= 16][ Jisim atom relatif : H= 1, N = 14, O= 16]

A 3.50 %

B 8.75 %

C 17.50 %

D 35.00 %

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11 Diagram 3 shows the set up of the apparatus of chemical cell using electrode pair of zinc andcopper.Rajah 3 menunjukkan susunan radas sel kimia menggunakan pasangan elektrod zink dankuprum.

DIAGRAM 3

The blue copper(II) sulphate solution becomes lighter.Warna biru larutan kuprum(II) sulfat didapati menjadi luntur

Which of the following explains the observation?Antara pernyataan berikut yang manakah menerangkan pemerhatian itu?

A

B

C

D

Zinc atom ionizesAtom zink mengion

Sulphate ion is dischargedIon sulfat dinyahscas

Copper atom ionizesAtom kuprum mengion

Copper(II) ion is dischargedIon kuprum(II) dinyahcas

Copper(II) sulphatesolutionLarutan kuprum(II) sulfat

ZincZinkCopper

kuprum

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12 Which of the following electrolytic cells produce oxygen gas at anode and hydrogen gas atcathode?Antara sel elektrolisis berikut, yang manakah membebaskan gas oksigen di anod dan gashidrogen di katod?

A B

C D

Carbon rodRod karbon

Carbon rodRod karbon

Concentrated sodiumchloride solutionLarutan natriumklorida pekat

Dilute sodiumchloride solutionLarutan natriumklorida cair

Dilute copper(II)chloride solutionLarutan kuprum(II)klorida cair

ConcentratedhydrochloricacidAsid hidroklorikpekat

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13 Diagram 4 figure shows hydrogen chloride gas is bubbled within the waterRajah 4 menunjukkan gas hidrogen klorida dialirkan ke dalam air

DIAGRAM 4RAJAH 4

Which of the following statements are true about the solution produced?Antara pernyataan berikut yang manakah benar tentang larutan yang dihasilkan?

I

II

III

IV

A

B

C

D

The solution produced is an acidLarutan yang dihasilkan adalah asid

The solution contains hydrogen ionsLarutan mengandungi ion hidrogen

The solution has a pH value below 7Larutan mempunyai nilai pH kurang dari 7

The solution produced reacts with zinc to release hydrogen gasLarutan yang dihasilkan bertindakbalas dengan zink untuk membebaskan gas hydrogen

I and II only

III and IV only

I, II and III only

I, II, III and IV

Hydrogen chloride gasGas hidrogen klorida

WaterAir

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14 Z is an element that reacts with water to produce hydrogen gas.Which of the following is likely to be the electron arrangement of Z?Z adalah satu unsur yang boleh bertindakbalas dengan air untuk menghasilkan gas hidrogen.Yang manakah antara berikut adalah susunan elektron Z?

A 2.4B 2.8.7C 2.8.8.1D 2.8.18.8

15 What happen when a small piece of burning sodium is quickly placed into a gas jar filled withchlorine gas as shown in the Diagram 5?

Apakah yang berlaku apabila satu kepingan kecil natrium yang terbakar dimasukkan dengancepat ke dalam balang gas yang diisi dengan gas klorin seperti dalam rajah 5 ?

DIAGRAM 5

A

B

C

D

Heat is absorbed by the gas jarHaba diserap oleh balang gas

Temperature remains constant inside the gas jarSuhu tinggal tetap di dalam baling gas

The white solid produced conducts electricity in its aqueous statePepejal putih yang dihasilkan mengalir arus elektrik dalam keadaan berair

The white solid dissolves readily in organic solventpepejal putih larut di dalam pelarut organic

Burning sodiumNatrium yangterbakar

ChlorinegasGas klorin

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16 Diagram 6 shows the atomic structure of element Y.Rajah 6 menunjukkan struktur atom unsur Y

DIAGRAM 6

Ion Y is most likelyIon Y yang mungkin ialah

ABCD

Y+

Y-

Y3+

Y5-

17 Which of the following is a use of cobalt-60 isotope?Antara yang berikut ,yang manakah kegunaan isotop kobalt- 60?

A Treatment of cancerRawatan kanser

B Sterilisation of insectsPensterilan serangga

C X-ray for body examinationSinar –X untuk pemeriksaan badan

D Dating for the age of fossils and artifactsPentarikhan usia fosil dan artifak

p=3n=4

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18 Which pair of the following reagents will produce an insoluble salt when react together?Antara pasangan reagen berikut yang manakah menghasilkan satu garam tidak larut apabiladitindakbalaskan bersama?

A

B

C

D

Nitric acid and sodium carbonateAsid nitrik dan natrium karbonat

Sulphuric acid and sodium hydroxideAsid sulfurik dan natrium hidroksida

Barium chloride and sodium nitrateBarium klorida dan natrium nitrat

Lead nitrate and sodium chloridePlumbum nitrat dan natrium klorida

19 Diagram 7 shows the set-up of apparatus for the titration of sodium hydroxide solution withsulphuric acid.Rajah 7 menunjukkan susunan radas bagi titratan larutan natrium hidroksida dengan asidsulfurik.

What is the volume of sulphuric acid needed at the end point of the titration in Diagram 7Berapakah isipadu asid sulfurik yang diperlukan pada takat akhir titratan dalam rajah 7

A

B

C

D

10.00 cm3

20.00 cm3

30.00 cm3

40.00 cm3

Sulphuric acidAsid sulfurik0.05 mol dm-3

20 cm3 of sodium hydroxide solution0.1 mol dm-3 and phenolphthalein as anindicator20 cm3 larutan natrium hidroksida0.1 mol dm-3 dan fenoltalein sebagaipenunjuk

Diagram 7Rajah 7

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20 Table 3 shows the voltage reading chemical cells using different electrode pairs dipped intocopper(II) sulphate solution.Jadual 3 menunjukkan nilai voltan bagi sel kimia menggunakan pasangan logam yang berlainanyang dicelupkan ke dalam larutan kuprum(II) sulfat.

Cellsel

Metal electodeElektrod logam Voltage reading(V)

Bacaan Voltan (V)Negative terminalTerminal negatif

Positive terminalTerminal positif

I W Z 2.7II W Y 2.3III X Z 1.5IV X Y

TABLE 3JADUAL 3

What is voltage reading of cell IV?Berapakah nilai voltan bagi sel IV ?

ABCD

0.4 V1.1 V1.2 V1.6 V

21 5.6 g element R react completely with 1.6 g oxygen.The letter R is not the actual symbol of the element.Which of the following chemical equations represent the reaction?[Relative atomic mass of R = 56 and O = 16]

5.6 g unsur R bertindak balas lengkap dengan 1.6 g oksigen.Huruf R bukan simbol sebenar unsur itu.Antara persamaan kimia berikut yang manakah mewakili tindak balas yang berlaku?[Jisim molekul relatif R=56 dan O=16]

A

B

C

D

2R + O2 2RO

2R + 3O2 2RO3

3R + 2O2 R2O4

4R + 3O2 2R2O3

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22 Diagram 8 shows excess copper(II) oxide powder in a beaker that contains dilute nitric acid.Rajah 8 menunjukkan serbuk kuprum(II) oksida yang berlebihan di dalam satu bikar yangmengandungi asid nitrik cair.

DIAGRAM 8RAJAH 8

Which of the following steps is correct to obtain copper(II) sulphate crystals?Antara langkah-langkah berikut, yang manakah betul untuk membentuk hablur kuprum(II) sulfat?

A

B

C

D

Filtration cooling evaporationTurasan penyejukan peruapan

Cooling filtration evaporationPenyejukan turasan, peruapan

Filtration evaporation coolingTurasan peruapan penyejukan

Evaporation cooling filtrationPeruapan turasan penyejukan

23 Which of the following substances can react with glacial ethanoic acid?Antara bahan-bahan berikut, yang manakah boleh bertindakbalas dengan asid ethanoik glasial?

A

B

C

D

Magnesium oxideMagnesium oksida

Magnesium ribbonPita magnesium

Calcium carbonate chipsKepingan kalsium karbonat

Sodium carbonate solutionLarutan natrium karbonat

HeatHaba

Dilute nitric acidAsid nitrik cair

copper(II) oxide powderserbuk kuprum(II) oksida

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24 Compound X has the following properties.Sebatian x mempunyai sifat-sifat berikut .

• Melting point 800 ˚CTakat lebur pada 800˚C

• Soluble in waterLarut dalam air

• Conducts electricity in aqueous solutionMengkonduksi arus elektrik dalam larutan akueus

What is X?Apakah X?

A

B

C

D

GlucoseGlukosa

NaphthaleneNaftalena

Sodium chlorideNatrium klorida

Lead(II) bromidePlumbum (II) bromide

25 Which of the following particles in a solution of hydrogen chloride is responsible for its acidityproperties?Antara pernyataan berikut,yang manakah dalam larutan hidrogen klorida bertanggungjawab keatas sifat asidnya ?A

B

C

D

Cl-

OH-

HCl

H+

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26 Which pair of metals produces the highest voltage in a voltaic cell?

Yang manakah antara pasangan logam berikut menghasilkan voltan tertinggi dalam sebuah selvoltan?

A

B

C

D

Tin – IronStanum-Ferum

Silver - MagnesiumArgentum-Magnesium

Copper - ZincKuprum - zink

Zinc - AluminiumZink - Aluminium

27 Which of the following is a weak acid ?Yang manakah antara berikut adalah asid lemah?A Ethanoic acid

Asid Etanoik

B Hydrochloric acidAsid Hidroklorik

C Phosphoric acidAsid fosforik

D Sulphuric acidAsid Sulfurik

28 The proton number of element X is 6 and the proton number of element Y is 9. What is theformula of a compound formed between X and Y?Nombor proton unsur X ialah 6 manakala nombor proton unsur Y ialah 9. Apakah formulasebatian yang terbentuk antara unsur X dan Y?

A XYB XY3

C XY4

D X2Y3

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29 Which one of the following salt is soluble?

Yang manakah antara berikut adalah garam terlarutkan?

A Barium sulphateBarium sulfat

B Silver chlorideArgentum klorida

C Lead (II) sulphatePlumbum(II)sulfat

D Sodium carbonateNatrium karbonat

30 Element P is placed in Group 15 and Period 2.What is the proton number for P ?Unsur P terletak dalam Kumpulan 15 dan Kala 2.Apakah nombor proton bagi P ?

A 2B 7C 15D 17

31 Diagram 11 shows the appratus used to test the electrical conductivity of four substances.Rajah 11 menunjukkan susunan radas yang digunakan untuk menguji kekonduksian elektrik bagiempat bahan.

What is substance Y?Apakah bahan Y?

A Molten naphthaleneLeburan naftalena

B Molten lead (II) bromideLeburan Plumbun(II) iodida

C Glasial ethanoic acidAsid ehanoik glasial

D 1,1,1-trichloroethane1,1,1- tri kloroetana

Substance YBahan Y

Diagram 11Rajah 11

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Metal PLogam P

Metal RLogam R

AMagnesiumMagnesium

CopperKuprum

BCopperKuprum

LeadPlumbum

CTinTimah

IronFerum

DIronFerum

AluminiumAluminium

33 Which of the following substances is acidic?Yang manakah antara berikut adalah bahan yang berasid?A

B

C

D

Sodium hydroxideNatrium hidroksida

Sulphur dioxideSulfur dioksida

Potassium oxideKalium oksida

AmmoniaAmmonia

32 Diagram 10 shows a simple chemical cell.Rajah 10 menunjukkan sebuah sel kimia ringkas.

Which pair of metals will produce an electron flow, in the direction shown?Pasangan logam manakah akan menghasilkan arah pergerakan elektronyang ditunjukkan?

P Q

e

Diagram 10Rajah 10

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34 Element X reacts with oxygen to form a covalent compound.Which of the following elementscould be X?Unsur X bertindakbalas dengan oksigen menghasilkan sebatian kovalen.Yang manakah di antaraunsur berikut mungkin X?

A CarbonKarbon

B SodiumNatrium

C AluminiumAluminium

D MagnesiumMagnesium

35 Diagram 11 shows pH value for solutions P, Q, R , S and T.Rajah 11 menunjukkan nilai pH bagi larutan P, Q, R, S dan T.

P Q R S TpH 1 pH 7 pH14

Diagram 11Rajah 11

What is the probable solution of P, Q, R, S and T?Apakah larutan yang mungkin bagi P, Q, R, S dan T?

Ethanoicacid

Asid etanoik

Sulphuricacid

Asid sulfurik

AmmoniasolutionLarutan

ammonia

SodiumchlorideNatriumklorida

SodiumhydroxideNatrium

hidroksida

A Q P T RS

B Q P S RT

C P Q R ST

D Q P R ST

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37 Which of the following is correct about the noble gases and their uses?Yang manakah antara berikut betul tentang gas nadir dan kegunaannya?A

B

C

D

Helium gas is used to fill a weather ballonGas Helium digunakan untuk mengisi belon kajiicuacaKrypton is used to fill light bulbKrypton digunakan untuk mengisi mentol cahayaNeon is mixed with oxygen to fill the diver’s tankGas Neon dicampurkan dengan oksigen untuk diisi ke dalam tangki penyelamArgon is used in laser to repair retina of the eyeGas Argon digunakan dalam laser untuk membaiki retina mata

38 Which of the following salts is prepared by the titration method?Yang manakah antara garam berikut disediakan dengan kaedah pentitratan?

A

B

C

D

Copper(II) sulphateKuprum (II)sulfat

Potassium nitrateKalium nitrat

Zinc chlorideZink klorida

Magnesium chlorideMagnesium klorida

36 Which of the following reaction will produced lead (II) nitrate?Yang manakah antara tindakbalas berikut menghasilkan Plumbum (II) nitratI Lead(II) oxide and nitric acid

Plumbum(II) oksida dan asid nitrikII Lead(II) carbonate and nitric acid

Plumbum(II) karbonat dan asid nitrikIII Lead (II) sulphate and nitric acid

Plumbum (II)sulfat dan asid nitrikIV Lead(II) chloride and sodium nitrate

Plumbum(II) klorida dan natrium nitratA I and II

B I,II and IIIC I and IVD I,II,III and IV

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39 Table 4 below shows the type of compounds for oxide of X and oxide of W.Jadual 4 di bawah menunjukkan jenis sebatian bagi oksida X dan oksida W.

Type of CompoundJenis sebatian

Oxde of XOksida X

CovalentKovalen

Oxide of WOksida W

IonicIon

Table 4Jadual 4

Which one of the following statements is correct?Yang manakah dari pernyataan berikut adalah benar?

A

B

C

D

X is a metalX adalah logam

The oxide of X has high melting point.Oksida bagi X mempunyai takat lebur yang tinggi

The oxide of W dissolves in waterOksida bagi W larut dalam air

The oxide of W can conduct electricity in solid state.Oksida bagi W boleh mengalirkan arus elektrik dalam keadaan pepejal.

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41 Below are some oxides of elements in Period 3 of the Periodic Table.Di bawah adalah oksida-oksida bagi unsur dalam Kala 3 pada Jadual Berkala

Na2O Al2O3 SO2 MgO SiO2

Which of the following are acidic oxides?Yang manakah antara berikut adalah oksida yang berasid?

A

B

C

D

Al2O3,MgO

Na2O,MgO

SO2,SiO2

Na2O, SO2

40

A

B

C

D

The pH value of an acid depends onNilai pH bagi sesuatu asid bergantung kepada

The solubility of the acid in waterKeterlarutan asid dalam air

The concentration of the hydrogen ionsKepekatan ion-ion hidrogen

The number of hydrogen atoms in the molecule of the acidBilangan atom hidrogen di dalam molekul asid

The temperature of the acid solutionSuhu larutan asid

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42 Table 5 shows the electron arrangement of atoms G,H,J and KJadual 5 menunjukkan susunan elektron bagi atom G,H,J dan K

AtomAtom

GG

HH

JJ

KK

Electron arrangementSusunan elektron 1 2.5 2.8.2 2.8.8.1

Table 5Jadual 5

Which of the following pairs of the elements can combine to form a covalent compound?Yang manakah antara pasangan unsur berikut membentuk suatu sebatian kovalen?A

B

C

D

G and HG dan HH and KH dan KG and KG dan KJ and KJ dan K

43 Table 6 shows the changes in the state of matterJadual 6menunjukkan perubahan keadaan jirim

Set Change of statePerubahan keadaan

ProcessProses

Change of energyPerubahan tenaga

I Gas to liquidGas kepada cecair

CondensationKondensasi

Energy releasedTenaga dibebaskan

II Solid to gasPepejal kepada gas

EvaporationPenyejatan

Energy absorbedTenaga diserap

III Liquid to gasCecair kepada gas

BoilingPendidihan

Energy absorbedTenaga diserap

IV Gas to liquidGas kepada cecair

SublimationPemejalwapan

Energy releasedTenaga dibebaskan

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Table 6Jadual 6

Which of the above statements are correct?Yang manakah pernyataan di atas adalah betul?A

B

C

D

I and III only

II and IV only

I,II and III only

I,II and IV only

44 Which of the following are balanced chemical equations?Yang manakah antara berikut persamaan kimia yang seimbang?

I

II

III

IV

A

B

C

D

2KClO3 2KCl + 3O2

2Na + 2H2O 2NaOH + H2

3CuCl2 + 2 Al 3Cu + 2AlCl3

Pb(NO3)2 + 2KI PbI2 + KNO3

II and III

I and IV

I, II and III

I,II,III and IV

45 Which of the following particles have the same total number of electrons?Yang manakah antara berikut mempunyai jumlah elektron yang sama ?(Proton number: Li=3,Ne=10,Na=11,Cl=17,K=19)ABCD

Cl- ,K+

Na+,Cl-

Li+,K+

Ne,Na+

46 The equation below represents the reaction to extract aluminium from aluminium oxide.Persamaan di bawah mewakili tindak balas pengekstrakan aluminium daripada aluminium

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25

oksida

What is the mass of aluminium that can be extracted from 102 g of aluminium oxide? [Relativeatomic mass : O = 16, Al = 27] Berapakah jisim aluminium yang boleh diekstrak daripada 102 galuminium oksida?[ Jisim atom relatif : O = 16, Al = 27]

ABCD

13.5 g27.0 g54.0 g108.0 g

47 Which of the following statements correctly describe a trend in the properties of the elementsfrom left to right across a period of the Periodic Table?Pernyataan yang manakah benar mengenai sifat unsur apabila merentasi Jadual Berkala darikiri ke kanan?A

B

C

D

The number of neutrons in an atom decreases.Bilangan neutron dalam suatu atom berkurang

The number of protons in an atom decreases.Bilangan proton dalam suatu atom berkurang

The number of electrons in the outer shell of an atom decreases.Bilangan elektron pada petala terluar suatu atom berkurang

The elements change from metals to non-metals.Unsur berubah dari logam kepada bukan logam

48 Diagram 12 shows the set-up of apparatus for an experiment to determine the empirical formulaof magnesium oxide.Rajah 12 menunjukkan susunan radas bagi eksperimen untuk menentukan formula empirikmagnesium oksida.

DIAGRAM 18HeatHaba

Magnesiummmm

CrucibleMangkuk pijar

LidPenutup

2Al2O3 → 4Al + 3O2

SULIT 4541/1

26

Diagram 18Diagram 12

Rajah 12

Why is the crucible lid opened once in a while during the experiment?Mengapakah penutup mangkuk pijar dibuka secara berkala semasa eksperimen?

A

B

C

D

To avoid explosionUntuk mencegah letupan

To cool the magnesiumUntuk menyejukkan magnesium

To allow oxygen gas to enter the crucibleUntuk membenarkan oksigen memasuki mangkuk pijar

To see what happen inside the crucibleUntuk melihat apakah yang berlaku di dalam mangkuk pijar

49 Sodium chloride is an ionic compound.It cannot conduct electiricity in solid state but itcan conduct electricity in molten state.This is becauseNatrium klorida adalah sebatian ionik .Ia tidak boleh mengkonduksikan elektrik dalam keadaanpepejal tetapi boleh mengkonduksikan arus elektrik dalam keadaan leburan.Ini adalah kerana

A The ions have a lot of free electronsIon-ion mempunyai banyak elektron

B The ions do not have enough kinetic energyIon-ion tidak mempunyai tenaga kinetik

C It consists of molecules in solid state and converts to ions in molten stateIa mengandungi molekul-molekul dalam keadaan pepejal dan bertukar kepada ion-ion

dalam keadaan leburD It consists of ions that are free to move in molten state , but not in solid state

Ia mengandungi ion-ion yang bebas bergerak dalam keadaan leburan ,tetapi tidak dalamkeadaan pepejal

50 Which of the following electron arrangements is found in a noble gas atom?Yang manakah antara berikut merupakan susunan elektron bagi atom nadir?

ABCD

2.812.12.8.2

SULIT 4541/1

27

END OF QUESTION PAPERKERTAS SOALAN TAMAT

________________________________________________________________________

PEPERIKSAAN SELARAS AKHIR TAHUN 2010

TINGKATAN EMPAT

CHEMISTRY

Mark Scheme

Paper 1

Answers for Chemistry Paper 1

1 A 2 B 3 A 4 C 5 C

6 B 7 A 8 C 9 C 10 D

11 D 12 A 13 D 14 C 15 C

16 A 17 A 18 D 19 B 20 B

21 A 22 C 23 D 24 C 25 D

26 B 27 A 28 C 29 D 30 B

31 B 32 A 33 B 34 A 35 B

36 A 37 A 38 B 39 C 40 B

41 C 42 A 43 A 44 C 45 D

46 C 47 D 48 C 49 D 50 A

SULIT 4541/2



KIMIAKERTAS 2

Oktober


1. Kertassoalan ini mengandungi tiga bahagian:

Bahagian A, Bahagian B, Bahagian C.

2. Jawab semua soalan dalam bahagian A. Tulis

jawapan dalam ruangan yang disediakan.

3. Jawab satu soalan dalam Bahagian B dan satu

soalan dalam Bahagian C. Jawab soalan dalam

Bahagian A dan Bahagian B dengan terperinci.

Anda boleh menggunakan persamaan kimia, rajah,

jadual, graf dan kaedah yang bersesuaian untuk

menerangkan jawapan anda .

4. Tunjukkan jalan kerja. Ia dapat membantu anda

mendapat markah.

5. Rajah dalam soalan tidak dilukis mengikut skala.

6. Anda boleh menggunakan kalkulator saintifik yang

tidak diprogramkan.

7. Serahkan kertas jawapan pada akhir waktu

peperiksaan

Untuk kegunaan pemeriksaBahagian No Markah

A

1

2

3

4

5

6

Jumlah

B7

8

Jumlah

C9

10

Jumlah

JUMLAH


2½ jam Dua jam tiga puluh minit

SULIT Nama

4541/2Chemistry TingkatanKertas 22 ½ jam

____________________________________________________________

PEPERIKSAAN AKHIR TAHUNTINGKATAN EMPAT 2010

CHEMISTRYKertas 2

Dua jam tiga puluh minit


1. Kertas soalan ini mengandungi tiga bahagian:Bahagian A, Bahagian B and Bahagian C.

2. Jawab semua soalan dalam Bahagian A. Tulisjawapan dalam Bahagian A dalam ruangan yangdisediakan..

3. Jawab satu soalan dalam Bahagian B dan satusoalan dalan Bahagian C. Jawab saoalan dalamBahagian A dan Bahagian B dengan terperinci.Anda boleh menggunakan persamaan kimia,rajah, jadual, graf dan kaedah yang bersesuaianuntuk menerangkan jawapan anda.

4. Tunjukkan jalan kerja. Ia dapat membantu andamendapat markah.

5. Rajah dalam soalan tidak dilukis mengikut skala.6. Markah yang diperuntukan bagi setiap soalan

ditunjukkan dalam kurungan.7. Anda boleh menggunakan kalkulator saintifik

yang tidak diprogramkan.8. Serahkan kertas jawapan pada akhir waktu

peperiksaan.

Kertas soalan ini mengandungi 21 halaman bercetak[Lihat sebelah]

Untuk kegunaan pemeriksaBahagian No. Markah

A

123456

Jumlah

B78

Jumlah

C910

JumlahJumlah Markah

2

INFORMATION FOR CANDIDATESMAKLUMAT UNTUK CALON

1. This question paper consists of three sections: Section A, Section B and Section C.Kertas soalan ini mengandungi tiga bahagian: Bahagian A, Bahagian B dan Bahagian C.

2. Answer all questions in Section A. Write your answers for Section A in the spacesprovided in the question paper.Jawab semua soalan dalam Bahagian A. Tuliskan jawapan bagi Bahagian A dalam ruangyang disediakan dalam kertas soalan.

3. Answer one question from Section B and one question from Section C.Write your answers for Section B and Section C on the `writing paper’ provided bythe invigilators.Answer questions in Section B and Section C in detail.You may use equations, diagrams, tables, graphs and other suitable methods toexplain your answer.Jawab satu soalan daripada Bahagian B dan satu soalan daripada Bahagian C. Tuliskanjawapan bagi Bahagian B dan Bahagian C pada kertas tulis yang disediakan. JawabBahagian B dan Bahagian C dengan terperinci. Anda boleh menggunakan persamaan,gambar rajah, jadual, graf dan cara lain yang sesuai untuk menjelaskan jawapan anda.

4. Show your working. It may help you to get marks.Tunjukkan kerja mengira.Ini membantu anda mendapatkan markah.

5. If you wish to change your answer, neatly cross out the answer that you have done.Then write down the new answer.Sekiranya anda hendak membatalkan sesuatu jawapan, buat garisan di atas jawapan itu.

6. The diagrams in the questions are not drawn to scale unless stated.Rajah yang mengiringi soalan tidak dilukiskan mengikut skala kecuali dinyatakan.

7. Marks allocated for each question or part question are shown in brackets.Markah yang diperuntukkan bagi setiap soalan atau ceraian soalan ditunjukkan dalamkurungan.

8. The time suggested to answer Section A is 90 minutes, Section B is 30 minutes andSection C is 30 minutes.Masa yang dicadangkan untuk menjawab Bahagian A ialah 90 minit, Bahagian B ialah 30minit dan Bahagian C ialah 30 minit.

9. You may use a non-programmable scientific calculator.Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan.

10. Hand in your answer sheets at the end of the examination.Serahkan semua kertas jawapan anda di akhir peperiksaan.

3

Section ABahagian A

[60 marks][60 markah]

Answer all questions in this section.Jawab semua soalan dalam bahagian ini.

1 (Diagram 1 shows the set-up of an experiment to determine the melting point of solid X.Rajah 1 menunjukkan susunan radas bagi eksperimen untuk menentukan takat leburpepejal X.

DIAGRAM 1 /RAJAH 1

The temperature of X is recorded at 30 seconds intervals as shown below.Suhu X dicatat pada setiap 30 saat seperti ditunjukkan di bawah.

Time/secondMasa/saat

0 30 60 90 120 150 180 210

Temperature/oCSuhu/ oC

100 110 118 122 122 122 128 135

Table 1

(a) (i) Draw the graph of temperature against time for the heating of X on the graphpaper on page 3Lukiskan graf suhu melawan masa bagi pemanasan X pada kertas graf padamuka surat 3.

[ 3 marks ]

(ii) On the graph that you have drawn in (a)(i), label the melting point ofsubstance X Pada graf yang telah anda lukis di (a)(i), tandakan takat leburbahan X.

[ 1 mark]

Thermometer/ termometer

Water / Air

5

(iii) Explain why the temperature remains constant from 60 s to 120 s?Jelaskan mengapa suhu adalah tetap dari 60 s ke 120 s ?………………………………………………………………………………......

[ 2 marks]

(iv) Draw the arrangement of particles in X at 180oCLukiskan susunan zarah dalam X pada 180oC

[ 1 mark ]

(b) Diagram 2 shows the atomic structure of elements R and S.Rajah 2 menunjukkan struktur atom bagi unsur R dan S.

DIAGRAM/RAJAH 2

(i) What is the proton number of element R?Apakah nombor proton bagi unsur R?.....................................................................................................................

[ 1 mark ]

(ii) Atom of element S has a nucleon number of 17. Calculate the number ofneutrons in atom S.Atom unsur S mempunyai nombor nukleon 17. Hitungkan bilanganneutron bagi atom S.

…………………………………………………………………………….[ 1 mark ]

RS

X X

X X

X X XX

X X XX

X X X XX X

X X

X

6

(iii)Write the symbol of atom S in the form of SA

Z .

Tuliskan simbol bagi atom S dalam bentuk SAZ .

..........................................................................................................[ 1 mark ]

2 Diagram 3 shows the set up apparatus of an experiment to determine the empiricalformula of copper oxide.Rajah 3 menunjukkan susunan radas eksperimen untuk menentukan formula empiricbagi kuprum oksida.

Diagram 3Rajah 3

(a) What is the meaning of chemical formula?Apakah maksud formula kimia?

...………….………………………………………………………………………………[1 mark]

Copper(II) oxideKuprum(II) oksida

HeatPanaskan

Anhydrous calcium chloride, CaCl2

Kalsium klorida kontang, CaCl2

Hydrogen gasGas hidrogen

Porcelain dishMangkukporselin

7

(b) (i) Name an acid and a metal that can be used to prepare hydrogen gas inthis experiment.Namakan suatu asid dan logam yang boleh digunakan untuk menyediakangas hidrogen dalam eksperimen ini.

……………………………………………………………………………………..[1 mark]

(ii) Write a balanced chemical equation for the reaction between the acid andthe metal in (b) (i).Tuliskan persamaan kimia yang seimbang untuk tindak balas yangberlaku di antara asid dan logam di (b) (i).

………….………………………………...………………………………………[1 mark]

(c) State one precaution that must be taken before the copper oxide is heated.Nyatakan satu langkah berjaga-jaga yang perlu diambil sebelum kuprumoksida dipanaskan.

………….……...…………………………………………………………………………[1 mark]

(d) Table 2 shows the results of an experiment carried out by a student.Jadual 2 menunjukkan keputusan eksperimen yang dilakukan oleh pelajar.

Mass of combustion tube + porcelain dishJisim tiub pembakaran + mangkuk porselin

30.24g

Mass of combustion tube + porcelain dish + copper (II) oxideJisim tiub pembakaran + mangkuk porselin + kuprum(II)oksida

32.26g

Mass of combustion tube + porcelain dish + copperJisim tiub pembakaran + mangkuk porselin + kuprum

31.86g

Table 2Jadual 2

(i) Calculate the number of moles of copper in this reaction. 2(d) (i)[Relative atomic mass : Cu = 64]Kirakan bilangan mol kuprum dalam tindak balas ini.[Jisim atom relatif : Cu= 64]

[1 mark] 1

8

(ii) Calculate the number of moles of oxygen in this reaction.[Relative atomic mass : O = 16]Kirakan bilangan mol oksigen dalam tindak balas ini.[Jisim atom relative: O= 16]

[1 mark]

(iii) Determine the empirical formula of copper oxide.Tentukan formula empirik kuprum oksida.

[2 marks](e) Name another metal oxide with empirical formula that can be determined using

the same method.Namakan suatu oksida logam yang lain di mana formula empiriknya ditentukandengan kaedah yang sama.

……..……………………………………………………………………………………[1 mark]

(f) M is a reactive metal. Suggest a method to determine the empirical formula ofthe oxide of M.

M merupakan suatu logam reaktif. Cadangkan satu kaedah untuk menentukanformula empirik bagi oksida M.

...............................................................................................................................[1 mark]

9

3 Diagram 4 shows part of the Periodic Table of the Elements. A, B, C, D, E, and F donot represent the actual symbol of the elements.Rajah 4 menunjukkan sebahagian daripada Jadual Berkala Unsur. A,B,C,D,E dan Ftidak mewakili simbol sebenar unsur-unsur berkenaan.

Diagram 4Rajah 4

Using the letters in the Periodic Table of the Elements in Diagram 4, answer thefollowing questions.Dengan menggunakan huruf-huruf yang terdapat dalam Jadual Berkala pada Rajah 4, jawab

soalan-soalan berikut.

(a) (i) State the position of element B in the Periodic Table.Nyatakan kedudukan unsur B dalam Jadual Berkala.

……………………………………………………………………………………..

[2 marks]

(ii) Choose the element which exhibit different oxidation numbers in itscompounds. Pilih unsur yang mempunyai pelbagai nombor pengoksidaandi dalam sebatiannya.

…………………………………………………………...………………………..[1 mark]

(b) Element A combines with element E to form a compound.Unsur A bergabung dengan unsur E untuk membentuk suatu sebatian.

(i) Write the chemical formula of this compound.Tuliskan formula kimia bagi sebatian ini.

..............................…………………………………………………………………[1 mark]

D

A EC

F

B

10

(ii) State one physical property of this compound.Nyatakan satu sifat fizik sebatian ini.

……………………………………………………………………….......................[1 mark]

(c) A and B have the same chemical properties.A dan B mempunyai sifat-sifat kimia yang sama.

(i) Which element is more reactive?Unsur yang manakah yang lebih reaktif?

......................................................................................................................[1 mark]

(ii) Explain your answer in (c) (i).Terangkan jawapan anda dalam (c) (i).

……………………………………………………………………………………..

……………………………………………………………………………………..[2 marks]

(d) (i) Which element exists as diatomic molecules?Unsur yang manakah membentuk molekul dwiatom?

……………………………………………………………………………………[1 mark]

(ii) Name the chemical bond in these diatomic molecules.Namakan ikatan kimia dalam molekul dwiatom ini.

..........................……………………………………………………………………[1 mark]

11

4 Diagram 5 shows the apparatus set-up to study the electrolysis of 1.0 mol dm-3

copper(II) sulphate solution using copper electrodes. The electrolysis process is

carried out for 20 minutes.

Rajah 5 menunjukkan radas untuk proses elektrolisis bagi 1.0 moldm-3 larutankuprum(II) sulfat menggunakan elektrod kuprum. Proses mengambil masa selama20 minit

Diagram 5Rajah 5

(a) Write the formula for all the cations present in copper(II) sulphate solution.Tulis semua formula kation yang hadir dalam larutan kuprum(II) sulfat

……………………………………………………………………………………[1 mark]

(b) Based on copper electrode X,Berdasarkan electrode kuprum di X,

(i) State one observationNyatakan satu pemerhatian

……………………………………………………………………………………[1 mark]

(ii) What ion will be discharged at the electrode X?Apakah ion yang dipilih untuk dinyahcas di electrode X?

……………………………………………………………………………………[1 mark]

Copper electrode Y Copper electrode X

Copper(II) sulphatesolution

12

(iii) Write the half equation for the reaction that occursTuliskan persamaan setengah bagi tindak balas yang berlaku

……………………………………………………………………………………[1 mark]

(c) After the experiment has been carried out, it is found that there is no changein the intensity of the blue copper(II) sulphate solution.Explain why.Selepas eksperimen dijalankan, tiada perubahan warna biru pada larutankuprum(II) sulfat. Terangkan mengapa.

………………………………………………………………………………………

……………………………………………………………………………………..[2 marks]

(d) The electrolysis is repeated using carbon electrodes to replace the twocopper electrodes.

Proses elektrolisis diulangi dengan menggantikan dua electrode kuprumdengan electrode karbon.

(i) Name the product formed at the carbon electrode YNamakan hasil yang terbentuk di electrode karbon Y

……………………………………………………………………………………[1 mark]

(e)

(ii) Describe a chemical test to confirm the product formed at carbon electrode Y.Terangkan ujian kimia untuk mengesahkan hasil yang terbentuk di electrode Y.

………………………………………………………………………………………

………………………………………………………………………………………[2 marks]

The apparatus set-up in Diagram 5 can be used for the electroplating of ironspoon with copper. At which electrode should the iron spoon be connected?Radas yang disediakan dalam rajah 5 boleh digunakan untuk menyadurkansudu besi dengan kuprum. Electrode yang manakah sudu besi perludisambungkan?

……………………………………………………………………………………[1 mark]

13

5 Diagram 6 shows the apparatus set-up for the neutralisation reaction between a strongacid and a strong alkali.Rajah 6 menunjukkan susunan radas untuk tindak balas peneutralan antara satu asidkuat dan satu alkali kuat.

DIAGRAM 6Rajah 6

25.0 cm3

of potassium hydroxide solution is transfered into a conical flask.A few drops of phenolphthalein indicator are added into the solution. The solution in

the conical flask is then titrated with 0.1 mol dm-3

hydrochloric acid .25.0 cm3 larutan kalium hidroksida dimasukkan ke dalam sebuah kelalang kon.Beberapa titik fenolftalein ditambah ke dalam larutan itu. Larutan dalam kelalang kon

dititratkan dengan 0.1 mol dm-3 asid hidroklorik.

(a) Hydrochloric acid is a strong acid. What is meant by a strong acid?Asid hidroklorik adalah asid kuat. Apakah yang dimaksudkan dengan asidkuat?

…………………………………………………………………………………

…………………………………………………………………………………[2 marks]

(b) Suggest an apparatus that can be used to measure 25.0 cm3 of potassiumhydroxide solution accurately.Cadangkan satu radas yang dapat digunakan untuk menyukat 25.0 cm3 larutankalium hidroksida dengan tepat.

…………………………………………………………………………………………. [1 mark]

Hydrochloric acid, 0.1 mol dm-3

Asid hidroklorik, 0.1 mol dm-3

25 cm3 potassium hydroxidesolution + phenolphthalein25 cm3 larutan kalium hidroksida +fenolftalein

14

(c) State the colour change of the solution in the conical flask at the end point.Nyatakan perubahan warna larutan dalam kelalang kon pada takat akhir.

…………………………………………………………………………………[1 mark]

(d) (i) Write a chemical equation for the above reaction.Tulis persamaan kimia bagi tindak balas di atas.

……………………………………………………………………………[2 marks]

(ii) In this experiment, 20.0 cm3 hydrochloric acid is needed to neutralise25.0 cm3 of potassium hydroxide solution. Calculate the molarity of the

potassium hydroxide solution.Dalam eksperimen ini, 20.0 cm3 asid hidroklorik diperlukan untukmeneutralkan 25.0 cm3 larutan kalium hidroksida. Hitungkankemolaran larutan kalium hidroksida itu.

[2 marks]

(e) (i) The experiment is repeated with 0.1 mol dm-3 sulphuric acid to replacehydrochloric acid. Predict the volume of sulphuric acid needed to neutralise25.0 cm3 potassium hydroxide solution.Eksperimen itu diulang dengan menggunakan 0.1 mol dm-3 asid sulfurikbagi menggantikan asid hidroklorik. Ramalkan isipadu asid sulfurik yang

diperlukan untuk meneutralkan 25.0 cm3 larutan kalium hidroksida.

……………………………………………………………………………[1 mark]

(ii) Explain your answer in (e) (i).Terangkan jawapan anda dalam (e)(i).

……………………………………………………………………………

………………………………………………………………………… [2 marks]

15

6 Diagram 7 shows the apparatus set-up for the preparation of zinc sulphate fromzinc carbonate and an acid.Rajah 7 menunjukkan susunan radas untuk penyediaan zink sulfat daripada zinkkarbonat dengan suatu asid.

Heat

Step 1

Step II

Step IV

HeatStep III

Diagram 7Rajah 7

(a) What is meant by salt?Apakah yang dimaksudkan dengan garam?

……………………………………………………………………… ................[1 mark]

(b) (i) Draw the diagram for step II in the box provided.Lukis gambar rajah untuk langkah II di dalam kotak yang disediakan.

[2 marks]

16

(ii) What is the purpose of carrying out step II?Apakah tujuan melakukan langkah II?

………………………………………………………………………[1 mark]

(c) (i) Name the acid used.Namakan asid yang digunakan.

………………………………………………………………………[1 mark]

(ii) Write the chemical equation for the reaction.Tuliskan persamaan kimia untuk tindak balas tersebut.

………………………………………………………………………[2 marks]

(d) State one of uses the salt in daily lives.Nyatakan satu kegunaan garam dalam kehidupan seharian

……………………………………………………………………[ 2 mark ]

17

Section B[20 marks]

Answer any one question.The time suggested to answer this section is 30 minutes.

7 (a) Diagram 8 shows the models of atoms developed by ErnestRutherford, Neils Bohr and the Modern atomic model.Rajah 8 menunjukkan model atom yang cipta oleh Ernest Rutherford ,Neils Bohr’s dan Model atom moden.

Electron moves outside thenucleus

Nucleus contains protons

Rutherford’s model Bohr’s model

DIAGRAM 8RAJAH 8

(i) Describe the atomic structure of the Neil Bohr’s modelTerangkan struktur atom Neil Bohr’s model.

[4 marks]

(ii) What is the difference in the position of electrons between the ErnestRutherford’s model and Neil Bohr’s model.Apakah perbezaan kedudukan electron diantara Ernest Rutherford’sModel dan Neil Bohr’s model.

[2 marks](iii) Draw the electron arrangement of an atom that consist of 13 electrons

using the Modern atomic model.Lukiskan susunan electron suatu atom yang mengandungi 13 elektronmenggunakan Modul atom moden.

[2 marks]

(b) Chlorine has two isotopes which are chlorine-35 and chlorine-37.The protonnumber pf Chlorine is 17.Klorin mempunyai dua isotopes iaitu Chlorine-35 dan Chlorine-37. Protonnumber klorin ialah 17.

Electron

Shell

Nucleus containsprotons

Modernatomicstructure

18

(i) Compare the number of sub atomic particles in these two isotopes.Bandingkan nombor sub atom zarah dalam kedua-dua isotop

[3 marks]

X(ii) Write the symbol for one of the isotope of chlorine in the form of A

ZX

Tuliskan symbol salah satu isotop dalam bentuk AZ

[2 marks]

(iii) Describe fully the atomic structure for the chlorine isotope that you havestated in (b) (ii).Terangkan sepenuhnya struktur atom bagi isotop klorin yang dinyatakanDalam (b) (ii)

[7 marks]

8. (a) Diagram 9 shows the position of chlorine and iodine in the Periodic Tableof elements.Rajah 9 menunjukkan kedudukan klorin dan iodin di dalam JadualBerkala Unsur.

Cl

I

Diagram 9Rajah 9

Which group does these elements belongs to?Explain why chlorine is more reactive than iodine.

Dalam kumpulan manakah unsur ini terletak?Terangkan mengapa klorin lebih reaktif berbanding iodin?

[4 marks]

19

(b) Diagram 10 shows the reaction between potassium with water. Theexperiment is repeated using sodium to replace potassium.Observations are recorded in Table 2

Rajah 10 menunjukkan tindak balas antara kalium dengan air.Eksperimen di ulangi menggunakan natrium menggantikan kalium.Permerhatian dicatatkan di dalam jadual 3

Diagram 10Rajah 10

ElementUnsur

ProtonnumberNomborproton

ObservationPemerhatian

PotassiumKalium

19

Metal moves very vigorously on the surface ofwater.Colourless solution formed and changed redlitmus paper blue.Bergerak sangat cergas di permukaan air.Larutan tanpa warna yang terhasil menukarkanwarna kertaslitmus merah kepada biru

SodiumNatrium

11

Metal moves vigorously on the surface of waterwith a ‘hissing’ sound.Colourless solution is formed and changed redlitmus paper blue.Bergerak cergas di permukaan air dengan bunyi‘hiss’.Larutan tanpa warna terbentuk menukarkankertas litmus merah kepada biru

Table 3Jadual 3

20

(i) By using electron arrangement, explain why potassium andsodium similar chemical properties.Berdasarkan nombor proton, terangkan mengapa kedua-duaunsur menunjukkan sifat kimia yang sama.

[2 marks]

(ii) Write a balanced chemical equation for the reaction betweenpotassium and water.Tulis persamaan kima seimbang untuk tindak balas kalium danair.

[2 marks]

(iii) Explain briefly why the solutions obtained in both reactions turnsred litmus paper blue.Terangkan secara ringkas mengapa larutan yang diperolehimenukarkan kertas litmus merah kepada biru.

[2 marks]

(c) Table 4 shows the proton number of three elements.Jadual 4 menunjukkan bilangan proton bagi empat unsur..

ElementUnsur

Proton NumberBilanganproton

C 6

Na 11

O 8

Table 4Jadual 4

Explain how bonds are formed when:Terangkan bagaimana ikatan terbentuk apabila:

(i) Na reacts with O to form a compound P.Na bertindak balas dengan O membentuk sebatian P.

(ii) C reacts with O to form a compound Q.C bertindak balas dengan O membentuk sebatian Q.

[10 marks]

21

Section C[20 marks]

Answer any one question.The time suggested to answer this section is 30 minutes

9 Table 5 shows the electron arrangement of the atoms of element R, Q and Z.Jadual 5 menunjukkan susunan elektron bagi atom unsur R, Q dan Z.

ElementUnsur

Electron arrangementSusunan electron

RQZ

2.8.22.8.42.8.7

Table 5Jadual 5

(a) State the Period of the elements R, Q and Z in the Periodic Table?Explain your answer.Nyatakan Kala bagi unsur R , Q dan Z dalam Jadual Berkala.Terangkan jawapan anda.[2 marks]

(b) The R atom is represented as .

Draw the electron arrangement of the R. In your drawing, show thenumber of proton and neutron.

Atom R diwakili sebagai .

Lukiskan susunan elektron bagi atom unsur R. Dalam lukisan anda,tunjukkan bilangan proton dan neutron.

[2 marks]

(c)

R24

12

R24

12

Caffeine is one of the substances in coffee. 0.97 g of caffeine consistsof 0.48 g carbon, 0.05 g hydrogen, 0.28 g nitrogen and 0.16 g oxygen.The molar mass of caffeine is 194 g mol –1.

Kaffein adalah satu bahan yang terdapat di dalam kopi. 0.97 g kaffeinmengandungi 0.48 g karbon, 0.005 g hidrogen, 0.28 g nitrogen dan0.16 g oksigen. Jisim molar bagi kaffein ialah 194 g mol-1

22

Based on the information above,Determine the empirical formula and molecular formula of caffeine.Berdasarkan kepada maklumat di atas,Tentukan formula empirik dan formula molekul bagi kaffein.[ Relative atomic mass : C=12 ; H=1 ; O=16 ; N=14 ]

[8 marks]

(d)

Calculate the percentage of nitrogen by mass in each of the threefertilizers given above and determine the best fertiliser that a farmershould used for his plants.

Kira peratus jisim nitrogen dalam setiap satu dari tiga baja di atas dantentukan baja yang paling baik yang patut digunakan oleh petani untuktanamannya.[ Relative atomic mass : C=12 ; H=1 ; O=16 ; N=14 ; S=32 ]

[ 8 marks ]

10. (a) You have an impure silver plate. The impure silver plate can be purifiedby using electrolysis.Draw a labelled diagram of the set up of the apparatus for the process.Anda mempunyai satu kepingan argentum tak tulen. Kepingan argentumtak tulen tersebut boleh ditulenkan melalui proses elektrolisis.Lukiskan gambarajah berlabel susunan radas bagi eksperimen tersebut.

[4 marks]

Fertilisers usually have a high content of nitrogen. Nitrogen is needed toincrease the growth of plants such as vegetables. The following substancesare the examples of fertiliser which are used by farmers .

Baja biasanya mempunyai kandungan nitrogen yang tinggi. Nitrogendiperlukan untuk meningkatkan pembesaran tumbuhan sepertisayuran.Beriku adalah contoh baja yang dignakan oleh petani.

Ammonium suplhate, (NH4)2SO4

Urea, CO(NH2)2

Hydrazine, N2H2

23

(b) Study the following statement.Kaji pernyataan berikut:

Describe a laboratory experiment to prove this statement by using dilutesulphuric acid as the electrolyte and two different metals.

Huraikan satu eksperimen untuk membuktikan pernyataan di atas denganmenggunakan asid sulfurik cair sebagai elektrolit dan dua logam yang berlainan.

Your explanation must include:Penerangan anda mestilah mengandungi:

a labelled diagramgambar rajah berlabel

procedureprosedur

observationpemerhatian

half equationsetengah persamaan

[10 marks]

c) A pupil carried out an experiment to investigate the chemical changes thatoccur to copper (II) chloride as a result of reaction P.The result of theexperiment is shown in Diagram 11.Seorang pelajar menjalankan eksperimen untuk mengkaji perubahan kimiayang berlaku kepada kuprum (II) klorida dalam tindak balas P. Keputusaneksperimen ditunjukkan dalam Diagram 11.

Chemical energy can be changed to electrical energy.Tenaga kimia boleh ditukarkan kepada tenaga elektrik.

24

Diagram 11Rajah 11

(i) The chemical equation for reaction P is as follows:Persamaan kimia untuk tindak balas P di tunjukkan di bawah :

PbCl2 + Na2CO3 2NaCl + PbCO3

Excess sodium carbonate is added to 50 cm3 of 0.1 mol dm-3 lead(II)chloride. Given that the relative molecular mass of PbCO3= 267.Natrium carbonate berlebihan di tambah ke dalam 50 cm3 0.1mol dm-3

plumbum(II) kloride. Diberi jisim molekul relative PbCO3= 267

Calculate the mass of lead(II) carbonate precipitate formed.Kira jisim mendakan Plumbum(II) carbonate yang terhasil.

[2 marks]

(ii) Name solid X and state its colour.Namakan pepejal X dan nyatakan warna

[2 marks]

(iii) Name gas Y and describe a method to verify its identity.Namakan gas Y dan terangkan kaedah untuk mengesahkannya

[2 marks]

1

Skema pemarkahan kimia kertas 2

Q1 ExplanationMarks

Sub Total

a.(i)

(ii)

(iii)

(iv)

1. Both axis are labelled and with unity axis ; temperature/oC and x axis ; time/s

2. Uniform scale (size of graph must be bigger)3. All points are transfered correctly and best fit curve

[The melting point is marked accurately on the graph]

1. Heat energy is absorbed2. to overcome the forces between particles

1

1

1

1

1

1

1

3

1

2

1

b.(i)

(ii)

(iii)

12

9

17

S

9

1

1

1

1

1

1

TOTAL 10

2

Q2 ExplanationMarks

Sub Total

a.

Is a representation of a chemical substance using letters for atomsand subscripts for each type of atoms present in the substance.

1 1

b. (i)

(ii)

[ Able to name suitable acid and metal and its equation ]For example : zinc metal and hydrochloric acid

Zn + 2HCl ZnCl2 + H2

1

1

2

c. Hydrogen gas must be flowed/through/into the combustion tube fora few minutes before heating/The flow of hydrogen gas must be continuous throughout theexperiment/[ Accept any one answer]

1

1

d.(i)

(ii)

(iii)

Number of mole of copper = 1.6264

= 0.025mole

Number of mole of oxygen = 0.4016

= 0.025mole

Number of mole of copper : Number of mole of oxygen0.025 : 0.025

The simplest ratio 1 : 1The empirical formula of copper(II) oxide is CuO

1

1

1

1 4

e. Iron / Tin / Lead / Silver/ Aurum / 1 1

f. Burning of metal in excess oxygen 1 1

TOTAL

10

Q3Explanation

Marks

Sub Total

a.(i) Group 1 and Period 5

C

1+1 2

3

(ii) 1 1

b. (i)

(ii)

AE

Soluble in water// high melting / boiling point// conductselectricity in molten or aqueous solution

1

1

2

c. (i)

(ii)

B

The nuclei attraction towards the valence electrons is weaker in B.Thus it is easier for B to lose / release an electron to form apositively charged ion.

1

1

1

3

d.(i)

(ii)

D//E

Covalent bond

1

1

2

TOTAL 10

4

Q4 ExplanationMarks

Sub Total

a. Cu2+ , H+ 1 1

b. (i)

(ii)

(iii)

Brown solid/deposit formed //Electrode X becomes thicker //Mass of electrode X increases

Cu2+

Cu2+ + 2e → Cu

1

1

1

3

c. Number of Cu2+ ions discharged at the cathode is the same asnumber of Cu2+ ions formed at the anode.Concentration of Cu2+ ions remains the same.

1

1

2

d.(i)

(ii)

Oxygen

Insert a glowing wooden splinter into a test tube containing the gasThe gas relights the glowing wooden splinter.

1

1

1 3

e. Electrode X / cathode 1 1

TOTAL 10

5

Q5 ExplanationMarks

Sub Total

a. An acid that dissociates/ ionises completely in waterto form a high concentration of hydrogen ions

1

1 2

b. pipette 1 1

c. From pink to colourless 1 1

d.(i)

(ii)

HCl + KOH KCl + H2O

0.1 x 20 = 1Mb x 25 1

25Mb = 2Mb = 0.08moldm-3

2

1

3

e. (i) 10 cm3 // half the volume of hydrochloric acid 1 1

(ii) Sulphuric acid is a diprotic acid whereas hydrochloric acid is amonoprotic acid.So, the sulphuric acid used has twice the number of hydrogenions compared to hydrochloric acid .

1

1 2

TOTAL 11

6

Q6 ExplanationMarks

Sub Total

a. The chemical substance/ ionic compound formed from the

replacement of hydrogen ion in an acid by metal ion or ammonium

ion

1

1 2

b. (i)

(ii)

Beaker containing solution

Filter funnel and filter paper

To remove excess zinc carbonate

1

1

1 3

c. (i)

(ii)

Sulphuric acid

ZnCO3 + H2SO4 → ZnSO4 + CO2 +H2O

Correct reactants

Correct products

1

1

1

3

d. - as a preservatives// as a electrolyte 1

1

TOTAL 9

7

Questions Marking criteria Marks

7 (a) (i) 1. Atom consist proton and electron2. Electrons in the shell3. Protons are in the nucleus4. The nucleus in the middle of the atom

1111

4

(ii) 1. Rutherford’s model: Electrons outside the nucleus

2. Bohr’s model: Electrons in the shell

11

2

(iii)

1. Atom with nucleus and the number of shells is 3

2. Correct number of electrons: 2.8.3

11

2

(b)(i) 35 37Cl Cl

17 171. Symbol of an element2. Nucleon number3. Proton number

111

3

(b)(ii) 1. Chlorine-35 and chlorine-37 have 17 protons// The electronarrangements of chlorine-35 and chlorine- 37 are 2.8.7

2.The number of neutron in chlorine-35 and chlorine- 37 are 18 and 20respectively//The nucleon number of chlorine-35 and chlorine- 37 are35 and 37 respectively

11

2

(c) 1. Nucleus is at the centre of the atom2. Nucleus contains 17 protons, which are positively charged particles3. The number of neutrons are 18/20 which are neutral particles4. The nucleon number is 35/375. Electron cloud consist of 17 electrons6. Electron which is negatively charged particles move around thenucleus// Electron is located outside the nucleus/in the shell7. Electron arrangement is 2.8.7// The number of shells field withelectrons are 3

7

TOTAL 20

8


8 (a) 1. Halogen / group 17 / VII2. atomic size of chlorine atom is smaller than iodine atom.3. Force of attraction between nucleus and electron is stronger4. easier to accept electron .

1111 4

(b)(i) 1. [correct electron arrangement for both elements]Na: 2.8.1 K: 2.8.8.1

2. both atoms have 1/ same number of valence electron[r: same valence electron]

11

2

(b)(ii) 2 K + 2 H2O 2 KOH + H2

1. correct formulae of reactants and products2. balanced equation

11

2

(b)(iii) Products are alkaline / potassium hydroxide and sodium hydroxide it contains OH- ions

11

2

(c) (i) Formation of compound P1. Electron arrangement of atom Na is 2.8.1 / and atom O is 2.62. To achieve a stable octet electron arrangement3. Each Na atom donates one electron to form Na+ ion/equation

and each O atom accepts two electron to form O2- ions/equation

4. Na+ and O2- ions are attracted to each other by strongelectrostatic force // Na+ and O2- ions are attracted to form ionicbond

Diagram5. correct numbers of shells and electrons for both ions6. label ions

1111

1

16

(c) (ii) Formation of compound Q7. Electron arrangement of atom C is 2.4 and atom O is 2.68. Atom C share two pairs of electron with two O atoms //9. forming # double # covalent bonds.

Diagram10. correct numbers of electrons11. shows sharing of electrons

111

1 4

10

9

TOTAL 20


9 (a) Period 3 because the number of shell occupied with electron are three 1

12

(b) Correct number of shells and number of electronShow the number of proton and neutron in the nucleus

11

2

(c)Element C H N O

1 Mass /g 0.48 0.05 0.28 0.162 Number of mole 0.48/12

//0.040.05/1//0.05

0.28/14//0.02

0.16/16//0.01

3 The simplestratio

0.04/0.01

// 4

0.05/0.01

// 5

0.02/0.01

// 2

0.01/0.01

// 1

4 Empirical formula = C4H5N2O5 [C4H5N2O ]n = 1946 [ 97 ]n = 1947 n = 194/97 // 28 Molecular formula = C8H10N4O2

1111

111

18

(d)1 molar mass of ammonium sulphate = 132g/mol2 percentage of nitrogen in ammonium sulphate = 28/132 x

100% // 21.2%3 molar mass of urea = 60 g/mol4 percentage of nitrogen in urea = 28/ 60 x 100% // 46.7%5 molar mass of hydrazine = 32g/mol6 percentage of nitrogen in hydrazine = 28/132 x 100% // 87.5%7 Hydrazine has the richest source of nitrogen compares with

other fertilizers.8 The farmer should choose hydrazine

11111111

8

TOTAL 20

10


10 (a)

FunctionalLabel: 1 battery and ammeter

2 pure silver and impure silver3 silver nitrate solution

1111

4

(b)

Procedure:1. Clean both metals with sandpaper.2. Pour [electrolyte] into a beaker.3. Dip both metals into the [electrolyte]4. Connect both metals to a voltmeter / galvanometer / bulb

Observation:1. Needle of voltmeter / galvanometer deflects // bulb lights up.

[compulsory]2. Negative terminal becomes thinner // positive terminal becomes

thicker / bubbles are released

Half equation:Negative terminal: M Mn+ + nePositive terminal: Mn+ + ne M // 2H+ + 2e H2

1+1

1111

11

11

10

Pure silver

Silver nitrate solution

A

impure silver

[Metal]

[electrolyte]

G

[Metal]

11

C (i) Number of mole PbCl2 = MV = 0.1 X 50 = 0.005 mol1000 1000

From equation : 1 mol PbCl2 = 1 mol PbCO30.005 mol PbCl2 = 0.005 mol PbCO3

Mass of PbCO3 = 0.005 X 267 = 1.335g

1

1 2

(ii) Lead oxide, brown when hot and yellow when cold 1+1

2

(iii) Carbon dioxide.Pass the gas into limewater. The lime water turns chalky. This indicatethe presence of carbon dioxide gas.

1+1

2

TOTAL 20

SULIT 4541/3



KIMIAKERTAS 3

Oktober


1. Tulis nama dan tingkatan pada ruang yang

disediakan.

2. Kertas soalan ini adalah dalam dwi bahasa.

3. Calon hendaklah membaca arahan pada halaman 2 .

Untuk kegunaan pemeriksa sahaja

SoalanMarkahpenuh

Markahdiperolehi

1 18

2 15

3 17

Jumlah 50


1½ jam Satu jam tiga puluh minit

4541/3 [ Lihat sebelahSULIT

4541/3 NamaChemistry 3Oct/Nov 2010 Tingkatan1 ½ jam

PEPERIKSAAN SELARAS AKHIR TAHUN 2010TINGKATAN 4

MATA PELAJARAN SAINS DAN MATEMATIKSEKOLAH-SEKOLAH MENENGAH NEGERI MELAKA

Kelolaan :PEJABAT PELAJARAN DAERAH

MELAKA TENGAH * ALOR GAJAH * JASINDengan Kerjasama :

JABATAN PELAJARAN MELAKAJALAN ISTANA, BUKIT BERUANG, MELAKA

CHEMISTRY

Kertas 3

Satu jam tiga puluh minit


1. Tuliskan nama dan tingkatan padaruang yang disediakan.

2. Kertas soalan ini adalah dalam dwibahasa.

3. Calon hendaklah membaca arahan padahalaman 2 .

Untuk kegunaan pemeriksa sahaja

SoalanMarkahPenuh

Markahdiperolehi

1 18

2 15

3 17

Jumlah 50


SULIT 4541/3

[Lihat sebelahSULIT

2

INFORMATION FOR CANDIDATES

1. This question paper consists of three questions. Answer all questions.

2. Write your answer for Question 1 and 2 in the spaces provided in the question paper.

3. You may use equations, diagrams, tables, graph and other suitable methods to explainyour answer.

4. Show your working, it may help you to get marks.

5. If you wish to change your answer, neatly cross out the answer that you have done.Then write down the new answer.

6. The diagrams in the questions are not drawn to scale unless stated.

7. Marks allocated for each question or part question are shown in brackets.

8. The time suggested to answer each of the questions is 30 minutes.

9. You may use a non-programmable scientific calculator.

10. Hand in your answer sheets at the end of the examination.

Marks awarded :

Mark Description

3 Excellent : The best response

2 Satisfactory : An average response

1 Weak : An inaccurate response

0 No response or wrong response

SULIT 4541/3

[Lihat sebelahSULIT

3

Answer all questionsJawab semua soalan

1 An experiment was carried out to construct an electrochemical series of metals. Diagram 1.1shows the set-up apparatus for an experiment to measure the potential difference betweenmagnesium electrode and W electrode. An experiment was repeated by replacing W electrodewith X, Y and Z electrodes.The magnesium electrode is the negative terminal in all the experiments.

Satu eksperimen telah dijalankan untuk membina siri elektrokimia beberapa logam. Rajah1.1 menunjukkan susunan radas untuk mengukur beza keupayaan di antara elektrodmagnesium dan elektrod W. Eksperimen diulangi dengan menggantikan elektrod W denganelektrod X, Y dan Z.Elektrod magnesium adalah terminal negatif dalam kesemua eksperimen.

Diagram 1.1Rajah 1.1

Forexaminer’s

use

Magnesium electrodeElektrod magnesium

Electrode WElektrod W

Sodium chloride solutionLarutan natrium klorida

V

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4

Diagram 1.2 shows the voltmeter readings of all the experiments.Rajah 1.2 menunjukkan bacaan voltmeter bagi semua eksperimen.

Reading: ……………...Bacaan:

Reading: …………………….Bacaan:

Reading: ……………….Bacaan:

Reading: ………………….Bacaan:

Diagram 1.2Rajah 1.2

(a) Record the voltmeter readings in the spaces provided in Diagram 1.2.Catatkan bacaan voltmeter pada ruang yang disediakan dalam Rajah 1.2.

[3 marks]

Mg and W Mg and X

Mg and Z

1(a)

3

Mg and Y

Forexaminer’s

use

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[Lihat sebelahSULIT

5

(b) Construct a table to record the voltmeter reading for the different pair of metal.Bina satu jadual untuk merekod bacaan voltmeter untuk pasangan logam yang berlainan.

[3 marks]

(c) State one hypothesis for this experiment.Nyatakan satu hipotesis bagi eksperimen ini.

………………………………………………………………………………………………

………………………………………………………………………………………………

………………………………………………………………………………………………[3 marks]

(d) For this experiment, state:Bagi eksperimen ini, nyatakan:

(i) The manipulated variablePembolehubah dimanipulasikan

………………………………………………………………………………

(ii) The responding variablePembolehubah bergerak balas

………………………………………………………………………………

(iii) The constant variablePembolehubah dimalarkan

………………………………………………………………………………

1(c)

3

1(b)

3

Forexaminer’s

use

1(d)

3

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[Lihat sebelahSULIT

6

[3 marks]

(e) Based on the voltmeter readings, arrange all the metals in ascending order of theirelectropositivity.Berdasarkan bacaan voltmeter, susunkan semua logam dalam susunan menaikkeelektropositifan.

…………………………………………………………………………..………………[3 marks]

(f) Suggest the possible voltage if X and Z electrodes is used to construct electrochemicalseries.Cadangkan nilai voltan yang mungkin jika elektrod X dan Z digunakan untuk membinasiri elektrokimia.

…………………………………………………………………………..………………[3 marks]

Forexaminer’s

use

1(e)

3

1(f)

3

Total 1

18

SULIT 4541/3

[Lihat sebelahSULIT

7

2 A student carried out an experiment to investigate the role of water in showing the properties ofacids as shown in the Diagram 2.Seorang pelajar telah menjalankan satu eksperimen untuk menyiasat peranan air dalammenunjukkan sifat-sifat bagi asid seperti yang ditunjukkan dalam Rajah 2.

Diagram 2Rajah 2

(a) State the observation and the corresponding inferences in Table 2.1.Nyatakan pemerhatian dan inferens yang sepadan dalam Jadual 2.1.

Test tubeTabung uji

ObservationPemerhatian

InferenceInferens

ANo change

Tiada perubahan

B

Table 2.1.Jadual 2.1

[3 marks]

(b) Based on the test tube B, what is the meaning of acid.Berdasarkan tabung uji B, apakah yang dimaksudkan dengan acid.

…………………………………………………………………………………………………...

Forexaminer’s

use

Zinc plateKepingan zink

Glacial ethanoicacidAsid etanoikglasial

Glacial ethanoicacid+ waterAsid etanoikglacial + air

Test tube ATabung uji A

Test tube BTabung uji B

2(a)

3

2(b)

3

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[Lihat sebelahSULIT

8

…………………………………………………………………………………………………...[3 marks]

(c) Explain the role of water in showing the properties of acid.Terangkan peranan air dalam menunjukkan sifat-sifat acid.

…………………………………………………………………………………………………..

…………………………………………………………………………………………………..[3 marks]

(d) Zinc plate is replaced by zinc carbonate in test tube B.Name the two products formed.Kepingan zink digantikan dengan zink karbonat dalam tabung uji B.Namakan dua hasil tindak balas yang terbentuk.

…………………………………………………………………………..………………………[3 marks]

(e)

Classify the acids given into strong acid and weak acid.Kelaskan asid-asid yang diberi kepada asid kuat dan asid lemah.

[3 marks]

Strong acidAcid kuat

Weak acidAcid lemah

Hydrochloric acid, HCl Sulphuric acid, H2SO4

Asid hidroklorik, HCl Asid sulfurik, H2SO4

Phosphoric acid , H3PO4 Carbonic acid, H2CO3

Asid fosforik, H3PO4 Asid karbonik, H2CO3

Nitric acid, HNO3 Methanoic acid, HCOOHAsid nitrik, HNO3 Asid metanoik, HCOOH

Forexaminer’s

use

2(e)

3

2(c)

3

Total 2

15

SULIT 4541/3

[Lihat sebelahSULIT

9

3

Using the suitable apparatus and materials, you are required to design alaboratory experiment to determine the reactivity of above mentioned elementswhen they react with water.Dengan menggunakan bahan dan radas yang sesuai, anda dikehendakimerancang satu eksperimen dalam makmal untuk menentukan kereaktifan unsurkumpulan satu di atas melalui tindak balas dengan air.

Your planning must include the following items:Perancangan anda hendaklah mengandungi perkara-perkara berikut:

(a) Statement of problemPernyataan masalah

(b) All the variablesSemua pembolehubah

(c) HypothesisHipotesis

(d) Lists of substances and apparatusSenarai bahan dan alat radas

(e) ProcedureProsedur

(f) Tabulation of dataPenjadualan data

[17 markah]

END OF QUESTION PAPERKERTAS SOALAN TAMAT

Three elements of group 1 in the Periodic TableTiga unsur kumpulan 1 dalam Jadual Berkala

Lithium Sodium PotassiumLitium Natrium Kalium

SULIT 4541/3

OTI 1 2010 MARK SCHEME

1

4541/3Chemistry 3Oct/Nov 20101 ½ jam

PEPERIKSAAN SELARAS AKHIR TAHUN 2010TINGKATAN 4

MATA PELAJARAN SAINS DAN MATEMATIKSEKOLAH-SEKOLAH MENENGAH NEGERI MELAKA

Kelolaan :PEJABAT PELAJARAN DAERAH

MELAKA TENGAH * ALOR GAJAH * JASINDengan Kerjasama :

JABATAN PELAJARAN MELAKAJALAN ISTANA, BUKIT BERUANG, MELAKA

CHEMISTRY

Kertas 3

Skema Pemarkahan

Skema Pemarkahan ini mengandungi 8 halaman bercetak

SULIT 4541/3


2

MARKING SCHEMECHEMISTRY 3 , 4541/3

Question Rubric Score

1(a)

Able to state all the voltmeter readings accurately with correct unit andone decimal point.

Sample answer:

Mg and W : 2.0 VMg and X : 0.6 VMg and Y : 1.4 VMg and Z : 2.5 V

3

Able to state all the voltmeter readings accurately without unit.

Sample answer:

Mg and W : 2Mg and X : 0.60Mg and Y : 1.4Mg and Z : 2.5

2

Able to state at least two readings correctly without unit 1No response or wrong response 0


1(b )

Able to construct a table to record the voltmeter reading for each pair ofmetals that contain:

1. Correct titles2. Readings

Sample answer:Pairs of metals Voltage / VMg and W 2.0Mg and X 0.6Mg and Y 1.4Mg and Z 2.5

3

Able to construct a less accurate table that contains:1. Titles2. Readings

2

Able to construct a table with at least one title / reading 1No response or wrong response 0

SULIT 4541/3


3


1(c )

Able to give the hypothesis accurately

Sample answer:The further the distance between two metals in the electrochemical series,the higher the potential difference / voltage

3

Able to give the hypothesis almost accurately

Sample answer:The further the distance between two metals, the higher potentialdifference/voltage // vice versa

2

Able to state an idea of hypothesis

Sample answer:Different metals affects the potential difference

1

No response or wrong response 0


1(d )

Able to state all the three variables correctly

Sample answer:Manipulated variable: Pair of metalResponding variable: Voltmeter reading/voltageConstant variable: magnesium/negative electrode, sodium

Chloride solution//electrolyter: volume of sodium chloride/electrolyte

3

Able to state any two variables correctly 2Able to state any one variable correctly 1No response or wrong response 0


1(e)Able to arrange in ascending order of all the metals

Sample answer:Z, W, Y, X, Mg

3

Able to arrange any four metals in correct ascending order 2Able to arrange any three metals in correct ascending order 1No response or wrong response 0


1(f)

Able to predict the value of voltage accurately with unit.Answer:1.9 V

3

Able to predict the value of voltage accurately without unit.Answer:1.9

2

Able to give an idea the value of voltage.1.4 < V < 2.5

1

No response or wrong response 0

SULIT 4541/3


4


2(a)

Able to state the observation and corresponding infences correctly

Sample answer:

Test tube Observation InferenceA - No reactionB Bubbles of gas

producedHydrogen gas releases

3

Able to state any two answer correctly 2Able to state any one answer correctly 1No response given / wrong response 0


2(b)

Able to give the meaning of acid correctly

Sample answer:Substance that produced hydrogen gas when reacts with zinc.

3

Able to give the meaning of acid.

Sample answer:Substance that ionize/dissolve in water to produce hydrogen ion //substance that produce bubbles when reacts with zinc.

2

Able to give an idea of acid

Sample answer:Substance that change blue litmus paper to red // substance that has pHvalue lower than 7.

1

No response given / wrong response 0


2(c)

Able to explain the role of water correctly

Sample answer:Water can ionise/dissociate acid to form hydrogen ion.

3

Able to explain the role of water less accurately

Sample answer:Water can ionise/dissociate acid // water can produce hydrogen ion.

2

Able to give an idea of the role of water.

Sample answer:To show the acidity of acid.

1


SULIT 4541/3


5


2(d)

Able to write the name of any two products correctly

Sample answer:1. Zinc ethanoate2. Carbon dioxide3. water

3

Able to write the name of any one product correctly or any two productsless accurately

Sample answer:1. zinc ethanoate // carbon dioxide // water2. CO2 and H2O//(CH3COO)2Zn and CO2 //(CH3COO)2Zn and H2O

2

Able to state an idea of the product.

Sample answer:(CH3COO)2Zn // CO2 // H2O

1



2(e)

Able to classify all the acids correctly

Sample answer:

Strong acid Weak acidHydrochloric acid. HClNitric acid, HNO3

Sulphuric acid, H2SO4

Phosphoric acid, H3PO4

Carbonic acid, H2CO3

Methanoic acid, HCOOH

3

Able to classify any four acids correctly 2

Able to classify any two acids correctly or give opposite heading

Sample answer:

Weak acid Strong acidHydrochloric acid. HClNitric acid, HNO3

Sulphuric acid, H2SO4

Phosphoric acid, H3PO4

Carbonic acid, H2CO3

Methanoic acid, HCOOH

1


SULIT 4541/3


6

QuestionNumber

Rubric Score

3(a)

[ Able to give the statement of the problem accurately]Example :How does the reactivity of lithium, sodium andpotassium/group 1 elements change when they react with water?

3

[ Able to give the statement of the problem correctly ]Example :How does the reactivity of lithium, sodium and potassium?//To determine the reactivity of group 1 elements react with water

2

[ Able to give an idea of statement of the problem correctly]Example :To investigate the reactivity of group 1 elements

1

[ No response or wrong response] 0

QuestionNumber

Rubric Score

3(b)

[ Able to state All variables correctly ]Example :Manipulated variable : Different types of alkali metals//Lithium,

sodium,potassiumResponding variable : Reactivity of alkali metals with waterConstant variable : Size of alkali metals, water

3

[ Able to state any two variables correctly ] 2[ Able to state any one variables correctly ] 1[ No response or wrong response] 0

QuestionNumber

Rubric Score

3(c)

[ Able to give the hypothesis correctly]Example :When going down Group 1, the reactivity of the metals withwater increase.

3

[ Able to give the hypothesis almost correct]Example :When going down the group, the reactivity of the metalsincrease.// the reactivity of the metals with water increase, whengoing down Group 1

2

[ Able to state an idea of the hypothesis ]Example :The position of the metals affect the reactivity

1

[No response or wrong response] 0

SULIT 4541/3


7

QuestionNumber

Rubric Score

3(d)

[ Able to give the list of the apparatus and materials correctlyand completely]

Example :

Lithium, sodium, potassium, water, small knife, forcep,basin,filter

paper

3

[ Able to give the list of the apparatus and materials correctlybut not completele]Example :Lithium, sodium, potassium, water, basin

2

[ Able to give an idea about the list of the apparatus andsubstances correctly]Example :Any one apparatus and one substance

1


QuestionNumber

RubricScore

3(e)

[ Able to state all procedures correctly ]Example :

1. Fill a basin with water

2. Cut a small piece of lithium using a knife and forceps

3. Dry the oil on the surface of thr lithium with filter paper

4. Place the lithium slowly onto water surface in a trough

5. Record your observations

6. Repeat steps 1 – 5 using sodium and potassium to replacelithium one by one

3

[ Able to state 4 steps of procedures correctly ]Steps 1,2,4,6

2

[ Able to state 3 steps of procedures correctly ]Steps 1,4,5

1


QuestionNumber

Rubric Score

SULIT 4541/3


8

3 (f)

Able to exhibit the tabulation of data that includes thefollowing information.

1. HeadingsExample :

Metals Observations

Lithium

Sodium

Potassium

3

[ Able to exhibit the tabulation of data that includes thefollowing information

1. HeadingsExample:

Metals Observations2

[ Able to state an idea about the tabulation of data ]Example :Metals 1


END OF MARK SCHEME

kimia k123 f4 2010

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