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4541/1ChemistryPaper 1May 2009

1 1/4 hours

JABATAN PELAJARAN MELAKA

____________________________________________________________

UJIAN PENGESANAN PERTENGAHAN TAHUNSIJIL PELAJARAN MALAYSIA 2009

CHEMISTRY

Paper 1

One hour and fifteen minutes

DO NOT OPEN THE QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO

1. This paper consists of 50 questions.

2. Answer all questions.

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

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

This paper consists of 33 printed pages

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4541/1 [Lihat sebelahSULIT]

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3 Which of the following substances consist of atoms?Antara bahan berikut, yang manakah terdiri daripada atom?

A LeadPlumbum

B Oxygen gasGas oksigen

C Lead(II) iodidePlumbum(II) iodida

D NaphthaleneNaftalena

4 The following is chemical equation for a reaction.Berikut ialah persamaan kimia bagi satu tindak balas.

CaCO 3 + 2HNO 3 Ca(NO 3)2 + H 2O + CO 2

Which of the following are the products?Antara berikut, yang manakah hasil tindak balas?

A H2O and CO 2

B HNO 3 and CO 2

C CaCO 3 and HNO 3

D Ca(NO 3)2, H2O and CO 2

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5 Diagram 2 shows a graph of temperature against time represents the heating of naphthalene powder.Rajah 2 menunjukkan graf suhu melawan masa bagi pemanasan serbuk naftalena.

Diagram 2Rajah 2

Which of the following statements is true?Antara yang berikut, pernyataan manakah yang benar ?

A Exist as liquid at XWujud sebagai cecair pada X

B Heat is released at YHaba dibebaskan pada Y

C The melting point is 80 oCTakat lebur ialah 80 oC

D The particles are very closely packed at ZZarah-zarah tersusun sangat rapat pada Z

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6 The following equation represents the chemical process to extract aluminium fromaluminium oxide.Persamaan dibawah menunjukkan proses kimia untuk mengekstrak aluminium darialuminium oksida

2 Al 2O3 4 Al + 3 O2

What is the volume of oxygen gas evolved when 204 g of aluminium oxide is used inextraction ?Berapakah isipadu gas oksigen yang terbebas apabila 204 g aluminium oksidadigunakan di dalam proses ini?

[ Relative atomic mass ; O ,16 ; Al , 27, 1 mol of gas occupies 24.0 dm 3 at roomtemperature ][Jisim atom relatif ; O, 16, Al, 27, 1 mol gas menempati 24.0 dm 3 pada suhu bilik.]

A 36 dm 3

B 144 dm 3

C 48 dm 3

D 72 dm 3

7 Table 1 shows the mass of element P and Q which react with each other.Jadual 1 menunjukkan jisim bagi unsur P dan Q yang bertindak balas.

ElementUnsur

P Q

Mass(g)Jisim(g)

0.32 0.36

Table 1Jadual 1

What is the emprical formula for the substance formed?Apakah formula empirik bagi sebatian yang terbentuk ?

[Relative atomic mass :P ,64 ; Q, 35.5][ Jisim atom relatif: P,64;Q,35.5]

A PQ 2

B PQ

C P2Q3

D PQ 4

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8 Diagram 3 shows the set-up of the apparatus to determine the empirical formula of substance Y.Rajah 3 menunjukkan susunan radas untuk menentukan formula empirik bahan Y.

Diagram 3Rajah 3

What could be substanceY ?Apakah mungkin bahan Y?

I Magnesium oxideMagnesium oksida

II Copper(II) oxideKuprum(II) oksida

III Lead (II) oxidePlumbum oksida

IV Silver oxideArgentum oksida

A I and II

B II and III

C III and IV

D II,III and IV

Hydrogen gasGas hidrogen

SubstanceYBahan Y

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9 2.7 g of element X reacts with 2.4 g element Y to form a substance with empricalformula of X 2Y3. What is the atomic mass of Y?2.7 g unsur X bertindak balas dengan 2.4 g unsur Y untuk membentuk sebatian denganformula empirik X 2Y 3. Berapakah jisim atom relatif bagi Y?

(Relative atomic mass :X ,27)( Jisim atom relatif: X,27)

A 8

B 16

C 24

D 31

10 The equation shows a reaction between silver nitrate solution and sodium chloridesolution .Persamaan di bawah menunjukkan tindak balas di antara larutan argentum nitrat danlarutan natrium klorida

AgNO 3 (aq) + NaCl(aq) NaNO 3 (aq) + AgCl(s)

Calculate the mass of silver chloride formed when 0.1 mol of silver nirate solution isadded to 0.1 mol of sodium chloride solution?Hitungkan jisim argentum klorida yang terbentuk apabila 0.1 mol larutan argentumnitrat di tambah ke dalam larutan 0.1 mol natrium klorida?[ Relative atomic mass : Cl, 35.5; Ag, 108][ Jisim atom relatif : Cl,35.5; Ag ,108]

A 28.7 g

B 14.35g

C 21.5 g

D 43.05g

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11 Diagram 4 shows the set-up of the apparatus for electrolysis process.Rajah 4 menunjukkan susunan radas yang digunakan dalam proses elektrolisis.

Diagram 4Rajah 4

Which of the following compound can be used as an electrolyte?Antara sebatian berikut yang manakah boleh digunakan sebagai elektrolit?

A EthanolEtanol

B NaphthaleneNaftalena

C Glucose solutionLarutan glukosa

D Ammonia solutionLarutan ammonia

12 Diagram 5 shows the electron arrangement of a compound between atom R and atom S.Rajah 5 menujukkan sususun elektron bagi sebatian yang terbentuk antara atom R danatom S .

Diagram 5Rajah 5

The compound formedSebatian yang terbentuk A is a covalent compound

merupakan sebatian kovalen

B is a ionic compoundmerupakan sebatian ion

C conducts electricitymengalirkan arus elektrik

D is soluble in waterlarut dalam air

CarbonKarbon

ElectrolyteElektrolit

CarbonKarbon

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15 Table 2 shows the proton number and number of electrons of several particles.Which of the following particles is a anion?Jadual 2 menunjukkan nombor proton dan bilangan elektron bagi beberapa zarah.Manakah di antara berikut merupakan anion?

ParticlesZarah

Proton NumberNombor Proton

Number of electronsBilangan elektron

P 3 2Q 9 10R 11 11S 20 18

Table 2Jadual 2

A P

B Q

C R

D S

16 Impure silver can be purified by using electrolysis. Which of the following pair of electrodes is correct?Argentum tak tulen boleh ditulenkan dengan menggunakan elektrolisis. Pasanganelektrod manakah adalah betul?

A

B

C

D

AnodeAnod

CathodeKatod

CarbonKarbon

Pure carbonKarbon tulen

CarbonKarbon

CarbonKarbon tak tulen

Pure silverArgentum tulen

Impure silverArgentum tak tulen

Impure silverArgentum tak tulen

Pure silverArgentum tulen Impure

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17 Diagram 6 shows the set-up of apparatus of an electrolytic cell.Rajah 6 menunjukkan susunan radas bagi sel elektrolisis.

Diagram 6Rajah 6

Which of the following graphs show the changes in mass of the cathode during

electrolysis ?Antara graf berikut manakah menunjukkan perubahan jisim katod semasa elektrolisis?

A

C

Copper(II) sulphate solutionLarutan kuprum(II) sulfat

Copper electrodesElektrod kuprum

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18 Table 3 shows the elements in Period 3 of the Periodic Table of elements. The elementscan react with oxygen to form oxides.Jadual 3 menunjukkan unsur-unsur Kala 3 dalam Jadual Berkala Unsur. Unsur-unsur tersebut bertindak balas dengan oksigen membentuk oksida.

ElementUnsur Na Mg Al Si P S Cl

Table 3Jadual3

Which of the following element form amphoteric oxide?Antara berikut unsur manakah membentuk oksida amfoterik?

A S

B P

C Si

D Al

19 The number of neutrons of atom X is 20. If the number of electrons of ion X 2+ is 18,what is the relative atomic mass of X?Bilangan neutron badi suatu atom X ialah 20. Jika bilangan elektron ion X 2+ ialah 18,berapakah jisim atom relatif X?

A 18

B 20

C 38

D 40

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20 The information below gives the advantages of using a voltaic cell T.Maklumat di bawah adalah kebaikan kebaikan menggunakan sel kimia T.

Can be recharged and used for a long timeBoleh di cas semula dan digunakan tempoh yang lamaAvailable in small sizeBoleh didapati dalam saiz yang kecil

Cell T can be aSel T adalah

I Dry cellSel kering

II Lead- acid accumalatorAkumulator asid -plumbum

III Mercury cellSel merkuri

IV Nickel cadmium cellSel nikel kadmium

A III only

B IV only

C I and III

D II and IV

21 Which of the following is true about an alkali?Antara pernyataan berikut yang manakah benar tentang alkali?

A An alkali is not corrosiveAlkali tidak mengkakis

B A strong alkali has a low pH valueAlkali kuat mempunyai nilai pH yang rendah

C A weak alkali has a high degree of ionizationAlkali lemah mempunyai kadar pengionan yang tinggi

D An alkali is a base that is soluble in waterAlkali ialah bes yang larut dalam air

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22 Which of the following solutions can show a pH value of 8?Antara larutan berikut yang manakah boleh menunjukkan nilai pH 8?

A 0.1 mol dm -3 of ethanoic acidAsid etanoik 0.1 mol dm -3

B 0.1 mol dm -3 of hydrochloric acidAsid hidroklorik 0.1 mol dm -3

C 0.1 mol dm -3 of ammonia solutionLarutan ammonia 0.1 mol dm -3

D 0.1 mol dm -3 of sodium hydroxide solutionLarutan natrium hidroksida 0.1 mol dm -3

23 The following equation represents a neutralization reaction.Persamaan berikut mewakili suatu tindak balas peneutralan.

Which pairs are reactants in this process?Pasangan yang mana merupakan bahan tindak balas dalam tindak balas tersebut??

I Sulphuric acid + sodium hydroxideAsid sulfurik + natrium hidroksida

II Nitric acid + solid copper(II) oxide.Asid nitrik + pepejal kuprum(II) karbonat

III Hydrochloric acid + CopperAsid hidroklorik + kuprum

IV Hydrochloric acid + calcium carbonateAsid hidroklorik + kalsium karbonat

A I and II only

B I, III and IV only

C II and III only

D I, II , III and IV

Acid + Base Salt + WaterAsid + Bes Garam + Air

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26 Diagram 7 shows the set up of apparatus to prepare lead(II) salt through precipitionreaction.Rajah 7 menunjukkan susunan radas bagi menyediakan garam plumbum(II) melaluitindakbalas pemendakan.

Which solution can be used as solution X ?Larutan apakah yang boleh digunakan sebagai larutan X?

I ammonium chloride solutionlarutan ammonium klorida

II sodium carbonate solutionlarutan natrium karbonat

III nitric acid solutionlarutan asid nitrik

IV zinc nitrate solutionlarutan zink nitrat

A I and II only

B I and III only

C II and IV only

D II, III and IV only

Diagram 7Rajah 7

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27 Diagram 8 shows a series of tests carried out on solution Y.Rajah 8 menunjukkan satu siri ujian telah dijalankan ke atas larutan Y.

Diagram 8Rajah 8

Which of the following is most likely to be solution Y.Antara berikut manakah kemungkinan larutan Y.

A Iron(II) sulphateFerum(II) sulfat

B Lead(II) sulphatePlumbum (II) sulfat

C Iron(II) chlorideFerum(II) klorida

D Copper(II) carbonate

Kuprum(II) karbonat

28 The body of an aeroplane is made of duralumin. What is the main metal in duralumin?Badan kapalterbang diperbuat daripada duralumin. Apakah logam utama dalamduralumin?

A IronBesi

B CopperKuprum

C AluminiumAluminium

D MagnesiumMagnesium

Green precipitateMendakan hijau

NaOH

White precipitateMendakan putih

Solution YLarutan Y

Dilute hydrochloric acid followed by BaCl 2solutionAsid hidroklorik diikuti dengan larutan BaCl 2

Solution YLarutan Y

White precipitateMendakan putih

Green precipitateMendakan hijau

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29 Equation below shows the oxidation of sulphur dioxide to form sulphur trioxide inContact Process.Persamaan di bawah menunjukkan pengoksidaan sulfur dioksida kepada sulfur trioksidadalam Proses Sentuh.

The reaction is catalysed byTindak balas ini dimangkinkan oleh

A PlatinumPlatinum

B Vanadium(V) oxideVanadium(V) oksida

C Manganese(IV) oxideMangan(IV) oksida

D IronFerum

30 The advantages of badminton rackets made of composite materials as compared to thosemade from wood areRaket badminton yang diperbuat daripada bahan komposit lebih baik daripada kayukerana

I Strongerlebih kuat

II DurableLebih tahan

III Lighterlebih ringan

IV high tensile strengthdaya regangan yang tinggi

A I and III only

B II and IV only

C I , II and III only

D I, II, III and IV

2SO 2 + O 2 2SO 3

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III

31 Curve 1 on Diagram 9 was obtained when 1 g of granulated zinc reacted with an excessof hydrochloric acid at 30 0C. Which of the following changes would have resulted incurve II?Lengkung 1 dalam Rajah 9 diperolehi apabila 1 g ketulan zink bertindak balas dengan asid hidroklorik berlebihan pada suhu 30 0C. Perubahan keadaan yang manakah akanmenghasilkan lengkung II?

A Keeping the reactants well stirredBahan tindak balas dikacau dengan sekata

B Using finely powdered zinc

Menggunakan serbuk zink yang lebih halus

C Using half as much zincMenggunakan separuh daripada jisim asal zink

D Diluting the acid with waterMencairkan asid menggunakan air

Diagram 9Rajah 9

Volume of gas/ cm 3

Isipadu gas / cm 3

Time / secondMasa / saat

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2032 The following equation shows the reaction between sodium thiosulphate with sulphuric

acid.Persamaan berikut menunjukkan tindak balas antara natrium tiosulfat dengan asid sulfurik.

When the concentration of sodium thiosulphate is increased, it is found that theformation of yellow precipitate of sulphur is faster. It is because there is an increasing inApabila kepekatan larutan natrium tiosulfat bertambah, didapati pembentukanmendakan kuning sulfur adalah lebih cepat. Ini adalah kerana terdapat peningkatandalam

A the kinetic energytenaga kinetic

B the number of particles per unit volumebilangan zarah per unit isipadu

C the activation energytenaga pengaktifan.

D the total surface areajumlah luas permukaan

33 Table 5 shows the result obtained from the decomposition of hydrogen peroxide.Jadual 5 menunjukkan keputusan yang diperoleh dari penguraian hidrogen peroksida.

Time/minuteMasa/minit 0 1 2 3 4 5 6

Volume of O 2 gas / cm 3

Isipadu gas O 2 / cm3 0 4 8 11 12 12 12

Table 5Jadual 5

Calculate the average rate of decomposition of hydrogen peroxide within the secondminute.Kira kadar tindak balas purata bagi penguraian hidrogen peroksida dalam minit kedua.

A 2.0 cm 3 min -1

B 3.0 cm 3 min -1

C 4.0 cm 3 min -1

D 12.0 cm 3 min -1

Na 2S2O3 + 2HCl 2NaCl + H 2O + SO 2 + S

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34 Graph below shows the total volume of carbon dioxide gas released when excess calciumcarbonate react with hydrochloric acid.Graf di bawah menunjukkan jumlah isipadu gas karbon dioksida yang terbebas apabilakalsium karbonat berlebihan bertindakbalas dengan asid hidroklorik.

It shows that,Graf menunjukkan ,

I The rate of reaction at 10 seconds is higher than the rate of reaction at 20 seconds.Kadar tindakbalas pada saat ke 10 lebih tinggi daripada kadar tindakbalas padasaat ke 20.

II The total volume of gas collected for the first 10 second is V/2 cm 3.Jumlah isipadu gas yang terkumpul pada 10 saat pertama ialah V/2 cm 3.

III Total volume of gas released is V cm 3.Jumlah isipadu gas yang terbebas ialah V cm 3

IV The rate of reaction is highest at 30 second.Kadar tindakbalas paling tinggi pada 30 saat.

A I and III only

B II and IV only

C I, II and III only

D I, II, III and IV

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35 Which of the following statements can be used to determine the rate of reaction?Antara berikut, pernyataan yang manakah dapat digunakan untuk menentukan kadar tindakbalas?

A Increase in the mass of reactant per unit time.Pertambahan jisim bahan tindakbalas.

B Release of gas per unit time.Pembebasan gas per unit masa.

C Decrease in the volume of product per unit time.Pengurangan isipadu hasil tindak balas per unit masa.

D Increase the mass of gas per unit time.Pertambahan jisim gas per unit masa

36 Table 6 shows the time taken to collect 20 cm 3 of hydrogen gas when 1 g of magnesiumwas allowed to react with 50 cm 3 of 1 mol dm -3 of sulphuric acid.Three experiments were repeated by using different sizes of magnesium.Jadual 6 menunjukkan masa yang diambil untuk mengumpul 20cm 3 gas hidrogenapabila 1 g magnesium bertindakbalas dengan 50cm 3 1 moldm -3 asid sulfurik.Eksperimen telah diulang sebanyak 3 kali dengan menggunakan saiz magnesium yangberbeza.

ExperimentEksperimen

I II III

Time / sMasa / s

15 7 25

Table 6Jadual 6

Arrange the experiments according to increasing in rate of reaction.Susun eksperimen di atas mengikut tertib susunan menaik bagi kadar tindakbalas.

A I, II, III

B III, II, I

C II, I, III

D III, I, II

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37 Diagram 10 shows the apparatus set-up to determine the rate of reaction betweencalcium carbonate and hydrochloric acid.Rajah 10 menunjukkan susunan radas yang digunakan untuk menentukan kadar tindak balasantara kalsium karbonat dan asid hidroklorik.

Diagram 10Rajah 10

Which part of the diagram is set up wrongly.Nyatakan kesilapan dalam pemasangan radas di atas.

I Fixing of cork Kedudukan gabus

II Position of thistle funnel

Kedudukan corong tisel

III Position of the delivery tube in the water trough.Kedudukan salur penghantar di dalam bekas takungan.

IV Position of the delivery tube in the conical flask.Kedudukan salur penghantar di dalam kelalang kon.

A II and IV only

B I and III only

C II and III only

D I, II, III and IV

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38 The equation shows the reaction between magnesium and hydrochloric acid.Persamaan di bawah menunjukkan tindak balas antara magnesium dan asid hidroklorik.

The rate of delibration of hydrogen gas decreased against time becauseKadar pembebasan gas hidrogen berkurang dengan masa kerana

I The total surface area of magnesium powder becomes smaller.Jumlah luas permukaan serbuk magnesium semakin berkurang.

II Concentration of hydrochloric acid solution decreasesKepekatan larutan asid hidroklorik semakin berkurang.

III Volume of hydrochloric acid solution decreases.Isipadu larutan asid hidroklorik semakin berkurang

IV Heat released to the surrounding.Haba dibebaskan ke persekitaran.

A I and II only

B III and IV only

C I, II and IV only

D I, III and IV only

Mg + 2HCl H 2 + MgCl 2

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39 Curve Q shows the volume of carbon dioxide gas released against time when 5 g of smallmarble chips react with 50 cm 3 of 1.0 mol dm -3 hydrochloric acid.Lengkung Q menunjukkan isipadu gas karbon dioksida yang dibebaskan melawan masa apabila5 g ketulan kecil marmar ditindakbalaskan dengan 50 cm 3 1.0 mol dm -3 larutan asid hidroklorik cair..

Curve P is obtained if the experiment is repeated by usingLengkung P akan diperolehi jika eksperimen diulang menggunakan

A 5 g of small marble chips is added to 100 cm 3 of 1.0 moldm -3 hydrochloric acid5 g ketulan kecil marmar ditambahkan kepada 100 cm 3 1.0 mol dm -3 larutan asid hidroklorik cair

B 5 g of small marble chips is added to 50 cm 3 of 2.0 moldm -3 hydrochloric acid

5 g ketulan kecil marmar ditambahkan kepada 50 cm3

2.0 mol dm-3

asid hidroklorik cair

C 5 g of large marble chips is added to 100 cm 3 of 1.0 moldm -3 hydrochloric acid5 g ketulan besar marmar ditambahkan kepada 100 cm 3 1.0 mol dm -3 larutan asid hidroklorik

D 5 g of small marble chips is added to 50 cm 3 of 1.0 moldm -3 hydrochloric acid5 g ketulan kecil marmar ditambahkan kepada 50 cm 3 1.0 mol dm -3 larutan asid hidroklorik cair

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40 Diagram 11 shows the molecular formula for hydrocarbon P, Q, R and S.Rajah11 menunjukkan formula molekul bagi hidrokarbon P, Q, R dan S.

P Q R SDiagram 11

Rajah 11

Which of the hydrocarbon is most suitable to be used as cooking gas?[relative atomic mass: C, 12; H, 1]Hidrokarbon yang manakah paling sesuai digunakan sebagai gas untuk memasak?[Jisim atom relatif: C, 12; H, 1]A P

B Q

C R

D S

41 The following chemical equation shows the conversion of ethene to ethanol.Persamaan kimia berikut menunjukkan pertukaran etena kepada etanol.

What is the name of the process shown by the above equation?Apakah nama proses yang terlibat dalam persamaan di atas?

A OxidationPengoksidaan

B HydrationPenghidratan

C DehydrationPendehidratan

D EsterificationPengesteran

C 2H 4 (g) + H 2O(g) H 3PO 4 C 2H 5OH (aq)

300 0C, 60 atm

C 3H 6 C 4H 8 C 4H 10 C 6H 6

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42 What is the homologous series of methyl ethanoate?Apakah siri homolog bagi metil etanoat?

A EsterEster

B Alkene

Alkena

C AlcoholAlkohol

D Carboxylic acidAsid karboksilik

43 Diagram 12 shows the structural formula for a hydrocarbon compound.Rajah 12 menunjukkan formula struktur bagi suatu sebatian hidrokarbon.

Diagram 12Rajah 12

Which of the following IUPAC nomenclature represents the compound in Diagram 12?Antara penamaan IUPAC berikut, yang manakah mewakili sebatian dalam Rajah 12?

A 3, 4 - dimethyl pent-2-ene3,4 dimetil pent-2-ena

B 3 propyl but-2-ene3 propel but-2-ena

C 1,2,3 trimethyl but-1-ene1,2,3- trimetil but-1-ena

D 2, 3 - dimethyl pent-3-ene2,3 dimetil pent-3-ena

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44 Diagram 13 shows the structural formula for substance X.Rajah 13 menunjukkan struktur formula bagi bahan X.

Diagram 13Rajah 13

Substance X,Bahan X,

I change the colour of acidified potassium dichromate(VI) solution from orange togreen.

menukar warna larutan kalium dikromat(VI) berasid daripada jingga ke hijau.

II is formed from oxidation of propanol.terbentuk daripada pengoksidaan propanol.

III react with ethanol to produce ethyl propanoatbertindakbalas dengan etanol untuk menghasilkan etil propanoat

IV undergoes dehydration reactionmenjalani tindakbalas pendehidratan.

A I and III only

B II and III only

C II, III and IV only

D I, II, III and IV

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45 Which of the homologous series is correctly paired to its functional group?Bagi jawapan berikut, pilih pasangan yang betul bagi siri homolog dan kumpulanberfungsi.

Homologous SeriesSiri Homolog

Functional groupKumpulan berfungsi

A AlkaneAlkana

B AlkeneAlkena

C AlcoholAlkohol

D Carboxylic acidAsid karboksilik

46 The equation below shows a chemical reaction of a hydrocarbon.Persamaan di bawah menunjukkan tindakbalas kimia bagi suatu hidrokarbon.

The name of the reaction isTindak balas tersebut ialah

A HalogenationPenghalogenan

B HydrationPenghidratan

C SubstituitionPenukargantian

D DehydrationPendehidratan

C2H4 + Cl2 C2H3Cl + HCl

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SULIT 4541/1


30

Palm Oil

47 Diagram 14 shows an industrial process.Rajah 14 menunjukkan satu proses industri .

Diagram 14Rajah 14

Name the process.Namakan proses tersebut.

A HydrogenationPenghidrogenan

B DehydrationPendehidratan

C HydrolysisHidrolisis

D HydrationPenghidratan

Margarine

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SULIT 4541/1


31

48 Diagram 15 shows two type of rubber molecule.Rajah 15 menunjukkan 2 jenis molekul getah.

Rubber X Rubber YGetah X Getah Y

Diagram 15

Rajah 15Which of the following is correct match of properties of rubber X and rubber Y?Antara berikut, yang manakah padanan sifat bagi getah X dan getah Y yang betul?

A

B

C

D

Rubber XGetah X

Rubber YGetah Y

More elasticLebih kenyal

Less elasticKurang kenyal

Stronger and harder

Kuat dan keras

Weaker and softer

Lemah dan lembut

High melting pointTakat lebur tinggi

Low melting pointTakat lebur rendah

Easy to oxidizeMudah teroksida

Difficult to oxidizeSukar teroksida

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SULIT 4541/1


32

49 Diagram 16 shows the process to produce compound J.Rajah 16 menunjukkan proses menghasilkan sebatian J.

Which of the following is the structural formula of compound J?

Antara berikut yang mana adalah formula struktur bagi sebatian J?

A

O||

CH 3CH 2COCH 2CH 2CH 3

B

O||

CH 3CH 2COCH 2CH 3

C

O||CH 3COCH 2CH 3

DO||

CH 3COCH 2CH 2CH 3

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SULIT 4541/1


33

50 The equation below shows the chemical equation of the combustion of ethanol in excessoxygen.Persamaan di bawah menunjukkan persamaan kimia bagi pembakaran etanol dalamoksigen berlebihan.

2C 2H5OH + 7O 2 4CO 2 + 6H2O

Calculate the volume of carbon dioxide gas released when 9.20 g ethanol reactscompletely.Hitung isipadu gas karbon dioksida yang terbebas apabila 9.2 g etanol bertindak balaslengkap.

[Relative atomic mass of H = 1, C = 12, O = 16, 1 mol of gas occupies 24 dm 3 at roomcondition][Jisim atom relatif H = 1, C = 12, O = 16, 1 mol gas memenuhi 24 dm 3 pada keadaanbilik]

A 4.8 cm 3

B 9.6 cm 3

C 96.0 cm 3

D 9600 cm 3

END OF QUESTION PAPERKERTAS SOALAN TAMAT

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SULIT4541/2ChemistryPaper 1Paper 2May 2009Marking Scheme

JABATAN PELAJARAN MELAKA

__________________________________________________________________________________________

UJIAN PENGESANAN PERTENGAHAN TAHUNSIJIL PELAJARAN MALAYSIA 2009

MARKING SCHEMECHEMISTRY

Paper 1 and Paper 2

Kertas soalan ini mengandungi 10 halaman bercetak4541/2 [Lihat sebelah

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2

SKEMA PERMARKAHANCHEMISTRY 1

4541/1

No

soalan Jawapan

No

soalan Jawapan

No

soalan Jawapan

No

soalan Jawapan

No

soalan Jawapan

1 D 11 D 21 D 31 B 41 B

2 C 12 A 22 C 32 B 42 A

3 A 13 B 23 A 33 C 43 A

4 D 14 C 24 C 34 C 44 B

5 C 15 B 25 B 35 B 45 D

6 D 16 D 26 A 36 D 46 A

7 A 17 C 27 A 37 A 47 A

8 B 18 D 28 C 38 A 48 D

9 B 19 D 29 B 39 C 49 D

10 B 20 B 30 C 40 C 50 A

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3

PAPER 2 SECTION A

No Marking Scheme Mark 1(a)

(b)

(i)(ii)(iii)

(i)

(ii)

14B1. Correct number of shells

2. Correct number of electrons at each shells3. Correct number of proton in nucleus4. Correct number of neutron in nucleusExamples:

P: liquidS: solidHas weak force of attraction between moleculesNeed low energy to overcome the force of attraction

111

111

1111

11

4

2

210

2 (a) 1. Formula that shows the simplest ratio2. the number of atoms for each element in the compound. 1

(b) Anhydrous calcium chloride//concentrated sulphuric acid 1

(c) To remove all the air in the tube 1

(d) 1. Repeat the process of heating, cooling and weighing2. until a constant mass is obtained

11 2

(e) 1. [Determine the mass of Pb and O correctly]2. [Calculate the no. of mole of Pb and O correctly]3. [Determine the simplest ratio of mole of Pb and O correctly]4. [State the empirical formula correctly]

Examples:Pb O

Mass/g 4.14 g 4.78 4.14 // 0.64 g

No.of mole 4.14/207 // 0.02 0.64/16 // 0.04Simplest ratio 0.02/0.02 = 1 0.04/0.02 = 2Empirical formula PbO 2

1111 4

(f) Magnesium is more reactive than hydrogen // Hydrogen is less reactive thanmagnesium // Hydrogen cannot reduce the magnesium oxide // Hydrogen isbelow magnesiumin reactivity series.

1

10

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4

3(a)

(b)

(c)

(d) (i)

(ii)

(iii)

1. Correct formula of reactant2. Correct formula of product3. Balance of equationExamples:

4Na + O 2 2 Na 2O

Colourless turn to pink

Burn very rapidly//White fume are produced//produced white solidwhen cooled.

Have 3 shells occupied/fill with electrons

Decrease

Number of shell filled with electron still same/three

Number of proton and electron increaseThe nucleus attraction will increase // nuclei attraction on thevalence electron increases

111

1

1

1

1

1

11

3

1

1

1

1

3

10

4 (a) 1. Substances that conduct electricity2. in molten state or aqueous solution3. undergoes chemical changes

1

(b) Mark ( +) at electrode P and ( -) at electrode Q correctly 1

(c) (i) Brown gas 1(ii) Bromine 1

(d) (i) Na + , Cl- , H+ , OH - 1(ii)

Electrode R Electrode SCl - , OH - Na + , H+

1 mark 1 mark 1+1 2

(iii) Chloride 1(iv) Concentration of chloride ions is higher than hydroxide ions 1(v) 2Cl - Cl 2 + 2e 1

10

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5

5(a)

(b)

(c)

(d)

(i)

(ii)

1. Functional apparatus and labeling of water2. [Correct apparatus to collect gas] e.g measuring cylinder

1. Correct axis2. Correct scale3. Transferring of point and smooth curve

1. Able to draw the correct tangent at 40 s2. Able to state the rate of reaction with correct unitRange : 0.85 k 0.88

1. [Able to draw the graf which steeper than the first graphand has the same maximum volume of gas collected]

2. Labelled the graph.

Mass of zinc decrease.

11

111

11

11

1

2

3

2

2

1

10

6 (a) (i) Alcohol 1(ii) OH H H H H OH

l l l l l lH- C C C H or H C C C H

l l l l l lH H H H H H

1

(b) 1. Correct formula of reactants and products2. Balance the equationExample:C3H7OH + 9/2O 2 3CO 2 + 4H 2O

11 2

(c) Propanoic acid 1

(d) (i) Dehydration 1(ii) 1. [Functional diagram]

2. [Labeled Al 2O3, glass wool + propan-1-ol and heat]11 2

(e) 1. Hexene burns with more sooty flame2. Percentage of carbon by mass in hexane is higher// [show

calculation]

11 2

10

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6

PAPER 2 SECTION B

7 (a)

(b)(i)

(ii)

(iii)

(iv)

Change of quantity of reactant/ productTime taken

1. Formula of reactants

2. Formula of products3. Balance chemical equation

Mg + 2HCI MgCI 2 + H2

1mol Mg = 1 mol H 2

0.2g X 24 = 0.2 dm 3

24

1. Both axes labeled with correct unit2. [Experiment III is more steeper than Experiment II ,

Experiment I is the less steeper]3. Same maximum volume of gas collected

Experiment I II III

0.2 / 0.004

50

0.2 / 0.010

20

0.2 / 0.013

15

1.Concentration of acid in experiment II is higher thanexperiment I.

2. Number of particles per unit volume is higher in Exp. II.3. Collision between particles is higher in Exp. II.4. Frequency of collision between particles is higher in

Exp. II.5. Frequency of effective collision also higher in Exp. II.

6. Experiment III using catalyst but not in Experiment II7. Catalyst lower the activation energy.8. Frequency of effective collision in Exp. III is higher than

in Exp. II.

1

1

11

1

1

1

11

1+1+1

111

11

1

1

1

1

5

3

3

8

20

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78 (a) (i) 1. [Example of strong acid]

H2SO 4 // Sulphuric acid // HCl // Hydrochloric acid // HNO 3 // Nitric acid

2. Strong acid ionised completely in water3. formed H + with higher concentration4. [Example of weak acid acid]

CH 3COOH // ethanoic acid

5. Weak acid ionised partially in water6. formed H + with lower concentration

11

111

11

Max 4

(b) (i) 1. Correct formula of reactants2. Correct formula of products3. Balance

H2SO 4 + 2 KOH K 2SO 4 + 2 H2O

4. The no. of mol of H 2SO 4 = 22 x 0.1/1000 // 0.00225. Mol of KOH = 2 x 0.0022 // 0.0044

6. Molarity of KOH = 0.0044x 1000 /25 // = 0.176 mol dm -3

OR

0.1 x 22 14. =

Mb x 25 2

5. M b = 2 x 0.1 x 2225

6. 0.176 mol dm -3

111

11

1 6

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8

8 (c) [chemical substances - 1 mark][ apparatus - 1 mark][procedure - 7 marks][chemical equation - 1 mark]

Sample answer :

1. [chemical substances]magnesium powder /magnesium oxide(Hydroxide, carbonate)and sulphuric acid

2. [ apparatus]Beaker, filter funnel, filter paper, glass rod

[procedure]3. [20 100] cm 3 sulphuric acid [0.5 2.0 ] mol dm -3 is poured

into a beaker4. magnesium powder is added to sulphuric acid until undissolved

/excess / no more effervescence5. Stir6. the mixture is filtered7. the filtrate is evaporated until saturate (one-third of it original

volume)8. the saturated solution is then allowed to cool to room

temperature.9. crystals is dried between filter paper10. [chemical equation]

Mg + H 2SO 4 MgSO 4 + H2 // MgO + H 2SO 4 MgSO 4 + H2O//

MgCO 3 + H2SO 4 MgSO 4 + CO 2 + H2O

1

1

1

1

111

1

11 10

20

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99 (a) Substance/compound that contains carbon and hydrogen only 1

(b) 1. n(CH 2) = 5612n + 2n = 56

2. n = 43. Molecular formula C 4H8

1

1

1 3

(c) 1. [Correct structural formula]2. [ Correct name]

Examples:

But-1-ene But-2-ene 2-Methylpropene

1+1+11+1+1 6

(d) [chemical substances and quantity - 1 mark][ apparatus - 1 mark][procedure - 5 marks][Observation 1 mark][chemical equation - 2 mark]

1. [2-5] cm 3 ethanol and [2-5] cm 3 butanoic acid2. boiling tube3. Add ethanol to butanoic acid4. Shake the mixture5. Add a little drop of concentrated sulphuric acid6. Heat it7. Poured into a beaker of water8. The product form has a fruity smell9. Correct formula of reactants10. Correct formula of products

C3H7COOH + C 2H5OH C 3H7COOC 2H5 + H2O

11111111

1+1 10

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10

10 (a)

(b)

(c)

(d)

Haber process

i) Formula of reactantii) Formula of product

iii) Balance of equation

1. N2 + 3H 2 2 NH 3

2. 1 volume of nitrogen gas to 3 volume of hydrogen gas3. Pressure at 200 atm.4. Temperature at 450 0 C5. Catalyst : Iron

Apparatus : Retort stand with clamp, [1 kg] weight, steel ballbearing metre rule.

Material : Copper block, bronze block, cellophane tape,thread.

1. Stick a stell ball bearing onto the copper block usingcellophane tape.

2. Hang 1 kg weight at a height of 50 cm above the ballbearing.

3. Drop the weight so that it hits the ball bearing.4. Measure the diameter of the dent made on the copperblock.

5. Repeat step1 to 4 twice on the other parts of thecopper block.

6. Repeat step 1 to 5 using the bronze block to replacethe copper block.

7. [Diagram ] - Functional diagram8. [Diagram ] labelling of copper/bronze block, steel

Ball bearing, metre rule, weight

1. Fibre glass2. High tensile strength // low density// easily moulded

1

111

1111

1

1

1

1

1

1

1

11

1

11

1

7

10

220

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