spm percubaan 2007 mrsm chemistry paper 2

8/14/2019 SPM Percubaan 2007 MRSM Chemistry Paper 2

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Name : . Index Number: .......

Class:

SPM TRIAL EXAMINATION 2007

MARA Junior Science College

CHEMISTRY

Paper 2

Two hours and thirty minutes

DO NOT OPEN THE QUESTION BOOKLET

UNTIL BEING TOLD TO DO SO

1. Write your name, index number and class in

the space provided.Tuliskan nama , angka giliran dan kelas anda pada

ruang yang disediakan.

2. The question booklet is bilingual

Kertas soalan ini adalah dalam dwibahasa.

3. Candidate is required to read the information

in page 2.Calon dikehendaki membaca maklumat

di halaman 2 .

For Examiners Use

Section QuestionFull

Mark

Obtained

Mark

1 9

2 10

3 9

4 11

5 11

A

6 10

7 20

B 8 20

9 20

C 10 20

TOTAL

This booklet contains 31 printed pages.

4541/2

ChemistryPaper 2

Sept 2007

2 hour


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INFORMATION FOR CANDIDATESMAKLUMAT UNTUK CALON

1. This question paper consists ofthree 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

spaces provided in the question paper.[Jawabsemua soalan dalamBahagian A. Tuliskan jawapan bagi Bahagian Adalam ruang yang

disediakan dalam kertas soalan].

3. Answer one question from Section B and one question from Section C. Write youranswers for Section B and Section C on the lined pages at the end of the question

paper. Answer questions in Section B and Section C in detail. You may use

equations, diagrams, tables, graphs and other suitable methods to explain youranswer.[Jawapsatu soalan daripadaBahagian B dansatu soalan daripadaBahagian C. Tuliskan jawapan

bagi Bahagian B dan Bahagian Cpada halaman bergaris di bahagian akhir kertas soalan ini.

Jawab Bahagian B dan Bahagian Cdengan 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 cancel any answer, neatly cross out the 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 dalam kurungan].

8. The time suggested to complete Section A is 90 minutes, Section B is 30 minutesand Section C is 30 minutes[Masa yang dicadangkan untuk menjawabBahagian A ialah 90 minit, Bahagian B ialah 30 minit

danBahagian 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 all your answer sheets at the end of the examination.[Serahkan semua kertas jawapan anda di akhir peperiksaan].


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Section ABahagian A

[60 marks]

Answerall questions in this section.

The time suggested to answer thissectionis 90 minutes[Jawabsemua soalan dalam bahagian ini.

Masa yang dicadangkan untuk menjawab bahagian ini ialah 90 minit.]

1 Diagram 1 shows the electronic arrangement of atoms of six elements.

P, Q, R, S, T and U do not represent the actual symbol of the elements.

Use the letters to answer the following questions.[Rajah 1 menunjukkan susunan elektron atom-atom bagi enam unsur.

P, Q, R, S, T, dan U tidak mewakili simbol sebenar unsur-unsur berkenaan.

Gunakan huruf-huruf yang diberikan untuk menjawab soalan-soalan berikut.]

DIAGRAM 1[RAJAH 1]

(a) Determine and fill the position of P and T in the Periodic Table of Elements givenbelow.[Tentukan dan isikan kedudukan P dan T dalam Jadual Berkala Unsur di bawah]

Q R

S U

[2 marks]

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

1(a)


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(b) State one element which:

[Nyatakan satu unsur yang merupakan]:

(i) is a metal: ..........................................................................................................[suatu logam]

[1 mark]

(ii) forms an ion with +2 charge: ...........................................................................[membentuk ion bercas +2]

[1 mark]

(iii) is used in advertising light: ...............................................................................[digunakan dalam lampu iklan]

[1 mark]

(c) Name the products formed when S reacts with water.[Namakan hasil-hasil yang terbentuk apabila S bertindak balas dengan air.]

........................................................................................................................................

[2 marks]

(d) State one usage of U in water treatment plant.[Nyatakan satu kegunaan U dalam loji rawatan air.]

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

(e) The atomic radius of T is smaller than S. Explain why.

[Jejari atom T lebih kecil dari S. Terangkan mengapa.]

........................................................................................................................................

[1 mark]

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

1(b)(i)

1(b)(ii)

1(b)(iii)

1(c)

1(d)

1(e)


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2 Diagram 2 shows the electrolysis of 1.0 mol dm-3

sodium chloride solution which is

still in progress.[Rajah 2 menunjukkan elektrolisis larutan natrium klorida 1.0 mol dm

-3yang sedang dijalankan]

DIAGRAM 2[RAJAH 2]

(a) Write the formulae of all ions present in the electrolyte.[Tuliskan formula semua ion yang wujud dalam elektrolit]

........................................................................................................................................

[1 mark]

(b) Name the gas produced at:[Namakan gas yang terhasil di]:

(i) burette X : ......................................................................................................[buret X]

(ii) burette Y : ......................................................................................................

[buret Y] [2 marks]

(c) State how you would verify the gas named at b(i).

[Nyatakan bagaimana anda mengesahkah gas yang dinamakan di b(i)]

........................................................................................................................................

........................................................................................................................................

........................................................................................................................................

[3 marks]

(d) (i) Write the half-equation for the process that occurs in burette X.[Tuliskan setengah persamaan bagi proses yang berlaku di buret X.]

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

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

2(b)

2(a)

2(c)

2(d)(i)


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(ii) At the end of the experiment, 30.00 cm3

of gas was collected at room

temperature in burette X.

Calculate the number of moles of gas collected in burette X.

[1 mol of gas occupies a volume of 24.0 dm3 at room temperature]

[Di akhir eksperimen, 30.00 cm3 gas dikumpulkan pada suhu bilik dalam buret X.Hitungkan bilangan mol gas yang dikumpulkan dalam buret X][1 mol gas menempati 24.0 dm

3pada suhu bilik]

[1 mark]

(e) Name a substance that can be used to replace carbon electrodes for the experiment

to get the same result?[Namakan satu bahan yang boleh digunakan untuk menggantikan elektrod karbon bagi eksperimen

menghasilkan keputusan yang sama.]

........................................................................................................................................

[1 mark]

(f) State one usage of the electrolysis of sodium chloride solution in industry.[Nyatakan satu kegunaan elektrolisis larutan natrium klorida dalam industri.]

........................................................................................................................................

[1 mark]

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

2(d)(ii)

2(e)

2(f)


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3 (a) Diagram 3 shows a series of tests performed on a colourless solution which

contains one cation and two anions..[Rajah 3. menunjukkan satu siri ujian yang dijalankan ke atas larutan tanpa warna yang

mengandungi satu kation dan dua anion.]

DIAGRAM 3[RAJAH 3]

(i) Based on the observations in Diagram 3, complete the table below withappropriate inferences.[Berdasarkan pemerhatian dalam Rajah 3, lengkapkan jadual di bawah dengan inferens

yang sesuai]

Test[ujian] Inference[inferens]

1

2

3

[3 marks]

(ii) Write an ionic equation for the reaction in Test 3.[Tuliskan persamaan ion bagi tindak balas dalam Ujian 3]

...........................................................................................................................

[1 mark]

+ HNO3(aq) , AgNO3(aq)

Colourless solution[Larutan tanpa warna]

+ NaOH (aq), then heated

(+ NaOH(ak), dan dipanaskan)

Vapour produced turns damp

red litmus paper to blue[Wap terhasil menukarkan kertas

litmus merah lembab kepada biru]

Test 1(Ujian 1)

White precipitate formed.[Mendakan putih terbentuk]

Brown ring formed[Cincin perang terbentuk]

Test 2(Ujian 2)

Test 3(Ujian 3)

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

3 a i

3 a ii


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(b) A student wants to prepare a pure sample of crystalline zinc sulphate by reacting

dilute sulphuric acid with substance X.[Seorang pelajar ingin menyediakan suatu sampel tulen hablur zink sulfat melalui tindak balas

antara asid sulfurik dengan bahan X]

(i) Name the substance X.[Namakan bahan X]

............................................................................................................................

[1 mark]

(ii) Write an equation for the above reaction.[Tuliskan satu persamaan kimia bagi tindak balas di atas]

............................................................................................................................

[1 mark]

(iii) Calculate the maximum mass of zinc sulphate that can be prepared if 50.0

cm3

of 0.2 mol dm-3

sulphuric acid is reacted with excess X.

[The relative formula mass of zinc sulphate = 161][Hitungkan jisim maksima zink sulfat yang dapat disediakan jika 50.0 cm3 larutan asid

sulfurik 0.2 mol dm-3

ditindak balaskan dengan X berlebihan]

[Jisim formula relatif zink sulfat = 161 ]

[3 marks]

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

3 b i

3(b)(ii)

3(b)(iii)


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4 An experiment is carried out to study the effect of concentration on rate of reaction.

50.0 cm3

of 0.5 mol dm-3

hydrochloric acid and excess granulated calcium carbonate

is put into a conical flask and is placed on an electronic balance as shown in

Diagram 4.

The mass of the conical flask and its contents is recorded at 60 seconds intervals.

[Satu eksperimen telah dijalankan untuk mengkaji kesan kepekatan ke atas kadar tindak balas.50.0 cm

3asid hidroklorik 0.5 mol dm

-3dan ketulan kalsium karbonat berlebihan dimasukkan ke

dalam kelalang kun diletakkan di atas neraca elektronik seperti dalam Rajah 4.

Jisim kelalang kun dan kandungannya direkodkan pada sela masa 60 saat].

DIAGRAM 4RAJAH 4

Table 4 shows the results.[Jadual 4 menunjukkan keputusan]

Time/sec.

[Masa/saat] 0 60 120 180 240 300 360 420 480Balance readings /g[Bacaan neraca/g] 140.64 140.48 140.37 140.31 140.26 140.22 140.20 140.20 140.20

TABLE 4[JADUAL 4]

(a) Give the definition of rate of reaction.[Berikan maksud kadar tindak balas]

........................................................................................................................................

[1 mark]

(b) Explain why the mass of the conical flask and its content decreases with time.[Terangkan mengapa jisim kelalang kun dan kandungannya berkurang dengan masa]

........................................................................................................................................

........................................................................................................................................

[1 mark]

(c) Based on Table 4, plot a graph of the mass of the conical flask and its content versus

time on the graph paper below.[Berdasarkan Jadual 4, plotkan graf jisim kelalang kun dan kandungannya melawan masa pada

kertas graf di bawah].

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

4(a

4(b)


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[3 marks] 4 c

Graph of mass of the conical flask and its content versus timeGraf jisim kelalang kun dan kandungannya melawan masa


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(d) Based on the graph, calculate the instantaneous rate of reaction at 120 seconds.

[Berdasarkan graf, hitungkan kadar tindak balas pada saat ke 120]

[3 marks]

(e) (i) Calculate the mass of carbon dioxide gas produced.[Hitungkan jisim gas karbon dioksida yang dihasilkan]

[1 mark]

(ii) Calculate the expected volume of gas produced at room condition.

[1 mol of gas occupies 24 dm3

at room condition; relative molecular mass of

CO2 is 44 ][Hitungkan isipadu gas yang dijangka akan terhasil pada keadaan bilik.

1 mol gas menempati 24 dm3 pada suhu bilik ; jisim molekul relatif CO2 ialah 44]

[2 marks]

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

4(d)

4(e)(i)

4(e (ii


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5 Diagram 5 shows a series of chemical reactions starting from compound Y.[Rajah 5 menunjukkan satu siri tindak balas kimia bermula daripada sebatian Y]

DIAGRAM 5RAJAH 5

(a) Name compound Y[Namakan sebatian Y]

........................................................................................................................................

[1 mark]

(b) Draw a diagram to show the set-up of apparatus if Process I is to be carried out in a

laboratory.[Lukiskan satu rajah untuk menunjukkan susunan radas jika Proses I dilakukan dalam makmal]

[2 marks]

CH3CH2COOH

Compound R

[Sebatian R]

Compound P[Sebatian P]

C3H6CH3CH2CH2OH

Compound Y[Sebatian Y]

Process I

(Proses I)

Process III(Proses III)

Process II(Proses II)

+ solution of bromine in CCl4[+ larutan bromin dalam CCl4]

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

5(a)

5(b)


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(c) Draw and name the structural formula of compound P[Lukis dan namakan formula struktur sebatian P]

[2 marks]

(d) Describe how Process III could be done in a laboratory.

[Perihalkan bagaimana Proses III dapat dijalankan dalam makmal]

........................................................................................................................................

........................................................................................................................................

........................................................................................................................................

[3 marks]

(e) Compound Y reacts with glacial ethanoic acid to form a sweet smelling liquid.[Sebatian Y bertindak balas dengan asid etanoik glacial membentuk larutan berbau manis]

(i) Name the process that occured.[Namakan proses yang berlaku]

[1 mark]

(ii) Write a chemical equation for the above reaction.[Tuliskan persamaan kimia untuk tindak balas di atas]

............................................................................................................................

[2 marks]

Name of compound P : ...............................................................................(Namakan sebatian P)

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

5(c

5(d

5(e)(i)

5(e)(ii)


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6 In an experiment to study the heat of neutralization, 25.0 cm3

of a 1.0 mol dm-3

sodium hydroxide solution was added to 25.0 cm3

of a 1.0 mol dm-3

aqueous

hydrochloric acid. The mixture was then stirred and the maximum temperature was

recorded.

Diagram 6 shows the set up of the apparatus used in the experiment.[Dalam satu eksperimen untuk mengkaji haba peneutralan, 25.0 cm

3larutan natrium hidroksida 1.0

mol dm-3

telah ditambahkan ke dalam 25.0 cm3

larutan akueus asid hidroklorik 1.0 mol dm-3

.

Campuran dikacau, dan suhu maksima direkodkan.

Rajah 6 menunjukkan susunan radas yang digunakan dalam eksperimen ini]

DIAGRAM 6RAJAH 6

The following data was obtained.[Data berikut diperoleh]

(a) What is meant by heat of neutralization?[Apakah yang dimaksudkan haba peneutralan?]

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

(b) Write an ionic equation for the reaction between hydrochloric acid and sodium

hydroxide.[Tulis persamaan ion bagi tindak balas antara asid hidroklorik dan natrium hidroksida]

........................................................................................................................................

[1 mark]

Initial temperature of sodium hydroxide solution = 28.5o

C(Suhu awal larutan natrium hidroksida)

Initial temperature of hydrochloric acid solution = 28.5oC

(Suhu awal larutan asid hidroklorik)

Maximum temperature of the mixture = 34.5oC

(Suhu maksima campuran)

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

6(a)

6(b)


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(c) Based on the data obtained from the experiment, calculate[Berdasarkan data yang diperolehi daripada eksperimen, hitung]

(i) the number of moles of hydrochloric acid used[ bilangan mol asid hidroklorik yang digunakan]

[1 mark]

(ii) the amount of heat released[kuantiti haba yang dibebaskan]

[1 mark]

(iii) the heat of neutralization

[haba peneutralan]

[1 mark]

6(c)(i)

6(c)(ii)

6(c)(iii)

For

Examiners

Use[Untuk

Kegunaan

Pemeriksa]


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(d) Draw the energy level diagram for the reaction.[Lukiskan gambar rajah aras tenaga bagi tindak balas]

[2 marks]

(e) (i) The heat of neutralization obtained from the experiment is less than the

theoretical value. Give a reason.[Haba peneutralan yang diperoleh dari eksperimen kurang dari nilai teori. Berikan sebab]

............................................................................................................................

............................................................................................................................

[1 mark]

(ii) Suggest one step that should be taken to modify the apparatus in order to get

a more accurate result.[Cadangkan satu langkah pengubahsuaian yang boleh dibuat ke atas radas untuk mendapat

keputusan yang lebih tepat]

............................................................................................................................

............................................................................................................................

[1 mark]

(f) The experiment is repeated by doubling the volume of both hydrochloric acid and

sodium hydroxide.

Assuming the initial temperature is maintained, what would be the maximumtemperature of the mixture?[Eksperimen diulang dengan menggandakan isipadu kedua-dua asid hidroklorik dan natrium

hidroksida.

Dengan anggapan bahawa suhu awal tindak balas adalah sama, apakah suhu maksima campuran

yang dijangkakan?]

........................................................................................................................................

[1 mark]

For

Examiners

Use

[Untuk

Kegunaan

Pemeriksa]

6(d)

6 e i

6(e)(ii)

6(f)


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Section B [Bahagian B]

[20 marks]

Answer any one question.Jawab mana-manasatu soalan.

7 (a) Table 7.1 shows information on the atomic structure and the relative atomic mass

of three elements: aluminium, carbon and oxygen.[Jadual 7.1 menunjukkan maklumat mengenai struktur atom dan jisim atom relatif bagi tiga

unsur:, aluminium, karbon dan oksigen]

Element[Unsur]

Number of proton[bilangan proton]

Number of neutron[Bilangan neutron]

Relative atomic mass[Jisim atom relatif]

Carbon

(Karbon)6 6 12

Oxygen(Oksigen)

8 8 16

Aluminium(Aluminium)

13 14 27

TABLE 7.1

[JADUAL 7.1]

(i) Based on Table 7.1, state the relationship between the relative atomic

mass of an element with the number of proton and neutron of its atom.[Berdasarkan Jadual 7.1, nyatakan perkaitan antara jisim atom relatif dengan bilangan

proton dan bilangan neutron yang dipunyai oleh suatu atom]

[1 mark]

(ii) Draw the electronic arrangement diagram for an ion of oxygen.[ Lukiskan rajah susunan electron bagi suatu ion yang terbentuk dari unsur oksigen]

[2 marks]

(iii) Aluminium and carbon react with oxygen to form aluminium oxide and

carbon dioxide respectively. The reactions are represented by the

following equations.[Aluminium dan karbon bertindak balas dengan oksigen membentuk aluminium oksida

dan karbon dioksida.Tindak balas ditunjukkan dalam persamaan di bawah ]

I. 4 Al + 3O2 2 Al2O3

II. C + O2 CO2

Describe how chemical bonds in aluminium oxide and carbon dioxide are

formed.[Perihalkan bagaimana ikatan-ikatan kimia dalam aluminium oksida dan karbon

dioksida dibentuk]

[8 marks]


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(b) Naphthalene and sodium chloride are white crystals at room temperature. Table

7.2 shows two physical properties of the compounds.[Naftalena dan natrium klorida adalah hablur berwarna putih pada suhu bilik. Jadual 7.2

menunjukkan dua sifat fizik bagi kedua-dua sebatian]

Compound(Sebatian) Melting point /

0

C(Takat lebur) Electrical conductivity(Kekonduksian elektrik)

Naphthalene(Naftalena) 80

Non electrolyte(Bukan elektrolit)

Sodium chloride

(Natrium klorida)801

Electrolyte(Elektrolit)

TABLE 7.2JADUAL 7.2

Explain the differences in the melting points and the electrical conductivity of

naphthalene and sodium chloride.

Your answer should be based on the[Terangkan perbezaan takat lebur dan kekonduksian elektrik bagi naftalena dan natrium

klorida. Jawapan anda hendaklah berdasarkan kepada]

types of particles present in both compounds[ jenis zarah yang hadir dalam kedua-dua sebatian]

types of bonds and[jenis ikatan]

forces of attraction[daya tarikan antara zarah]

[5 marks]

(c) Diagram 7 shows the symbol of two atoms of oxygen.[Rajah 7 menunjukkan simbol bagi dua atom oksigen]

DIAGRAM 7RAJAH 7

Compare and contrast the two atoms of oxygen.[Banding dan bezakan kedua-dua atom oksigen ini]

[4 marks]

O18

8O16

8


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8 (a) Table 8 shows the pH of two solutions.[Jadual 8 menunjukkan pH bagi dua larutan]

Solution pH

0.1mol dm-3 of potassium hydroxide solution(Larutan kalium hidroksida 0.1 mol dm-3 ) 130.1mol dm-3 of aqueous ammonia(Larutan ammonia 0.1 mol dm

-3)

11

TABLE 8[JADUAL 8]

Explain why the two solutions have different pH.[Terangkan mengapa kedua-dua larutan mempunyai nilai pH yang berbeza.].

[4 marks]

(b) An unlabeled reagent bottle is said to contain sulphuric acid solution.

Describe how you would confirm the solution.[Satu botol reagen yang tidak berlabel dikatakan mengandungi larutan asid sulfurik.

Perihalkan bagaimana anda mengesahkan larutan itu]

[4 marks]

(c) The structural formula of ethanoic acid is shown in Diagram 8.[Formula struktur bagi asid etanoik ditunjukkan dalam Rajah 8]

DIAGRAM 8[RAJAH 8]

(i) Explain why ethanoic acid is a monoprotic acid.

[ Terangkan mengapa asid etanoik adalah asid monobes]

[2 marks]

(ii) Glacial ethanoic acid does not conduct electricity but the aqueous solution

of ethanoic acid does. Explain why.[Asid etanoik glasial tidak mengkonduksikan elektrik tetapi larutan akueus asidetanoik mengkonduksikan elektrik. Terangkan mengapa]

[3 marks]

(iii) When zinc powder is added into an aqueous ethanoic acid, bubbles of

colourless gas are evolved.

Write a chemical equation for the reaction.[Bila serbuk zink ditambahkan ke dalam larutan akueus asid etanoik, gelembung-

gelembung gas tidak berwarna dibebaskan.

Tuliskan persaman kimia bagi tindak balas ini]

[2 marks]


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(d) The equation below shows the reaction between hydrochloric acid and

magnesium.[Persamaan di bawah menunjukkan tindak balas antara asid hidroklorik dan magnesium]

Mg + 2HCl MgCl2 + H2

50.0 cm3

of hydrochloric acid solution reacts with excess magnesium to produce

48 cm3

of hydrogen gas.

Calculate the concentration of the hydrochloric acid used.

[Molar volume of gas = 24.0 dm3

mol-1

][Satu larutan 50.0 cm

3asid hidroklorik bertindak balas dengan magnesium yang berlebihan

menghasilkan 48 cm3 gas hydrogen.

Hitungkan kepekatan asid hidroklorik]

[3 marks]

(e) Emission of gaseous pollutant from vehicles and industries leads to the

formation of acid rain.

Explain the effect of acid rain to the structure of buildings.[Pelepasan gas-gas pencemar dari kenderaan dan industri boleh menghasilkan hujan asid.

Terangkan kesan hujan asid terhadap struktur bangunan.]

[2 marks]


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Section C( Bahagian C)

[20 marks]

Answer any one question.Jawab mana-manasatu soalan.

9 (a) The following equations represent two chemical reactions,[Berikut adalah persamaan-persamaan bagi dua tindak balas kimia.]

I. AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3 (aq)

II. Zn(s) + CuSO4(aq) ZnSO4 (aq) + Cu (s)

Based on the equations, determine whether the reaction is a redox reaction.

Explain your answer.[Berdasarkan kepada persamaan kimia ini tentukan sama ada setiap tindak balas adalah

tindak balas redoks atau bukan.

Terangkan jawapan anda ]

[4 marks]

(b) Diagram 9 shows a cross section of two iron bars, P and Q which are plated by

zinc and tin layers respectively.[Rajah 9 menunjukkan keratan rentas bagi dua batang besi, P dan Q yang masing-masing disadur

dengan lapisan zink dan stanum]

DIAGRAM 9RAJAH 9

Explain how zinc and tin layers in P and Q protect the iron bars from corrosion.

Determine which iron bar is more protected from corrosion.[Terangkan bagaimana lapisan-lapisan zink dan stanum dalam P dan Q melindungi besi dari

kakisan.

Tentukan batang besi yang manakah lebih dilindungi dari kakisan]

[ 6 marks]


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(c) Fe2+

ion can be oxidized to Fe3+

ion while Fe3+

ion can be reduced to Fe2+

ion

as shown in the following half-equations.[Ion Fe2+ boleh dioksidakan kepada ion Fe3+ manakala ion Fe3+ boleh diturunkan kepada

ion Fe2+ seperti ditunjukkan dalam setengah persamaan berikut.

Fe2+

Fe3+

+ e

Fe3+

+ e Fe2+

Design an experiment to show how these two changes can be carried out.

Your answer should consist of the following:[Reka bentuk satu eksperimen bagi menunjukkan bagaimana dua perubahan ini dapat

dijalankan. Jawapan anda harus mengandungi perkara berikut]:

Chemicals required[Bahan kimia yang diperlukan]

Procedure of the experiment[Prosedur eksperimen]

Observation[Pemerhatian]

Overall chemical equation involved in the reaction[Persamaan tindak balas keseluruhan]

[10 marks]


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10 Sodium stearate and sodium dodecyl sulphate are cleaning agents. Their molecular formulae

are shown in Diagram 10.1.[Natrium stearat dan natrium dodekil sulfat adalah agen pembersihan. Formula molekul mereka ditunjukkan

dalam Rajah 10.1].

DIAGRAM 10.1RAJAH 10.1

(a) (i) Sodium stearate dissolves in water to form ions. Write an equation to show

the ionization of sodium stearate.[Natrium stearat larut dalam air membentuk ion. Tuliskan persamaan untuk

menunjukkan pengionan natrium stearat]

[1 mark]

(ii) Determine which of the two cleaning agents is more effective in their

cleansing action in hard water. Give reasons.[Tentukan agen pembersihan yang mana satukah lebih berkesan dalam tindakan pencucian

dalam air liat. Berikan alasan]

[4 marks]

(iii) Fat reacts with an alkali to form soap.

Describe an experiment to prepare a sample of soap. Your answer should

include:[Lemak bertindak balas dengan alkali membentuk sabun.

Perihalkan satu eksperimen untuk menyediakan satu sampel sabun. Jawapan anda harus

mengandungi]

Chemicals used[Bahan kimia yang diperlukan]

Procedure[Prosedur]

A test to verify the soap sample that you have prepared hasa cleansing effect.[Satu ujian untuk mengesahkan sampel sabun yang anda sediakan

mempunyai kesan pembersihan]

[8 marks]

Sodium stearate : CH3(CH2)16COONa(Natrium stearat)

Sodium dodecyl sulphate : CH3(CH2)11OSO3Na(Natrium dodekil sulfat)


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(b) Diagram 10.2 shows the arrangement of atoms of two substances, X and Y in solid

state.[Rajah 10.2 menunjukkan susunan atom-atom dalam dua bahan X dan Y pada keadaan pepejal]

X Y

DIAGRAM 10.2RAJAH 10.2

Based on Diagram 10.2, differentiate the arrangement of atoms and the

properties of substance X and Y.[Berdasarkan Rrajah 10.2, bezakan susunan atom dan sifat-sifat bagi bahan X dan Y]

[7 marks]

END OF QUESTION PAPERKERTAS SOALAN TAMAT

Tin atom[Atom stanum]

Copper atom[Atom kuprum]


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spm percubaan 2007 mrsm chemistry paper 2

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