ujian pengesanan pertengahan tahun 2009_chemistry 2

7/31/2019 Ujian Pengesanan Pertengahan Tahun 2009_Chemistry 2

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SULIT Name

4541/2

Chemistry Form

Paper 2

May 20092 hours

JABATAN PELAJARAN MELAKA

____________________________________________________________

UJIAN PENGESANAN PERTENGAHAN TAHUN

SIJIL PELAJARAN MALAYSIA 2009

CHEMISTRY

Paper 2

Two hours and thirty minutes

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

1. This question paper consists of three sections: Section

A, Section B and Section C.2. Answerall questions in Section A. Write your answersforSection A in the spaces provided in the question

paper.

3. Answerone question from Section B and one questionfrom Section C. Answers questions in Section B and

Section C in detail. You may use equations, diagrams,

tables, graphs and other suitable methods to explainyour answer.

4. Show your working. It may help you to get marks.

5. The diagrams in the questions are not drawn to scale

unless stated.

6. Marks allocated for each question or part question areshown in brackets.

7. You may use a non-programmable scientific

calculator.

8. Hand in your answer sheets at the end of the

examination

For Examiners use only

Section No. Marks

A

1

2

3

4

5

6

Total

B

7

8

Total

C910

Total

Total marks


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This question paper consists of22 printed pages

[Lihat sebelahINFORMATION FOR CANDIDATES

MAKLUMAT UNTUK CALON

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

2. Answerall questions in Section A. Write your answers forSection A in the spaces provided

in the question paper.Jawabsemuasoalan dalam Bahagian A. Tuliskan jawapan bagi Bahagian A dalam ruang yang

disediakan dalam kertas soalan

3. Answer one question from Section B and one question from Section C.

Write your answers forSection B and Section C on the `writing paper provided by theinvigilators.

Answer questions in Section B and Section C in detail.

You may use equations, diagrams, tables, graphs and other suitable methods to explain youranswer.Jawab satusoalan daripada Bahagian B dan satu soalan daripada Bahagian C. Tuliskan

jawapan bagi Bahagian B dan Bahagian C pada kertas tulis yang disediakan. Jawab Bahagian Bdan 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 dalam kurungan

8. The time suggested to answerSection A is 90 minutes, Section B is 30 minutes and

Section C is 30 minutes.Masa yang dicadangkan untuk menjawab Bahagian A ialah 90 minit, Bahagian B ialah 30 minit

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

2


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Section A

Bahagian A

[ 60 marks ]

[ 60 markah ]

Answerall questions in this sectionJawab semuasoalandalam bahagian ini.

1 Table 1.1 shows the number of protons, nucleon number and number of electrons for

five elements.

Jadual 1.1 menunjukkan bilangan proton, nombor nucleon dan bilangan electronuntuk lima unsur.

ElementsUnsur

Number ofProtons

Bilanganproton

NucleonNumber

Nombornukleon

Number ofElectrons

Bilanganelektron

A 6 12 6

B 8 16 8

C 13 27 10

E 17 35 17

Table 1.1

Use information from Table 1.1 to answer the following questionsGunakan maklumat dari Jadual 1.1 untuk menjawab soalan berikut.

` (a) (i) What is the number of neutrons for element C ?

Apakah bilangan neutron untuk unsur C ?

.

[1 mark]

1(a)(i)

(ii) State an element which is an isotope to the atom

Nyatakan unsur yang merupakan isotop kepada atom

.

[1 mark]

1(a)(ii)

3

1

1


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(iii) Draw the electron arrangement of an atom in an element A

Lukis susunan elektron dalam atom unsur A.

[4 marks]

1(a)(iii)

(b) Table 1.2 shows the melting point and boiling point of three substances.

Jadual 1.2 menunjukkan takat lebur dan takat didih untuk tiga sebatian.

Substances

Bahan

Melting point/ C

Takat lebur/C

Boiling point/ C

Takat didih/ C

P -5 67

Q -105 -38

S 801 1413

Table 1.2

Use information from Table 1.2 to answer the following questionsGunakan maklumat dari Jadual 1.2 untuk menjawab soalan berikut

` (i) What is the physical state of P and S at room temperature?

Apakah keadaan fizikal sebatian P dan S pada suhu bilik ?P: .........................................................................................................................

S: .........................................................................................................................

[2 marks]

1(b)(i)

(ii) Explain why substance Q has low melting point and boiling point.

Terangkan kenapa sebatian Q mempunyai takat lebur dan takat didih yang

rendah.

.

.

.

[2 mark]

1(b)(ii)

Total A1

4

4

2

2

10


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dry hydrogenhidrogen kering

2 Figure 2.1 shows the apparatus set up used in an experiment to determine the empiricalformula for an oxide of lead

Rajah 2.2 menunjukkan susunan rajah yang digunakan bagi menentukan formula

empirik bagi oksida plumbum oxide of lead

oksida plumbum

Figure 2.1 Rajah 2.1

The following data was obtained based on the experiment :Data berikut diperolehi berdasarkan suatu ekperimen

Mass of an oxide of lead = 4.78 g

Jisim oksida plumbumMass of lead = 4.14 g

Jisim plumbum

(a) What is meant by empirical formula ?Apakah yang dimaksudkan dengan formula empirik ?

...

...

[ 1 mark ]

2(a)

(b) Name one substance that can be used to dry the hydrogen gas.

Namakan bahan yang boleh digunakan untuk mengeringkan gas hidrogen.

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

[ 1 mark]

2(b)

(c) Why does the hydrogen gas need to be passed through the combustion tubefor a few minutes before heating ?

Mengapakah gas hidrogen dialirkan ke dalam tiub pembakaran beberapa minit

sebelum pemanasan ?

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

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

2(c)

5

1

1

1


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[ 1 mark]

(d) How to ensure the reaction is complete ?

Bagaimana anda memastikan tindak balas adalah lengkap?

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

[ 2 marks ]

2(d)

(e) Based on the above result,Berdasarkan keputusan di atas,

Determine the empirical formula for oxide of lead ?

Tentukan formula empirik bagi oksida plumbum ?

[Relative atomic mass for O = 16 and Pb = 207][Jisim atom relatif bagi O = 16 and Pb = 207.]

[ 4 marks ]

2(e)

(f) Why does the empirical formula of magnesium oxide cannot be determinedusing the above method ?

Mengapa formula empirik magnesium oksida tidak boleh ditentukan

menggunakan kaedah di atas ?

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

[ 1 mark ]

2(f)

Total A2

6

2

4

1

10


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3 Figure 3.1 shows a set up apparatus for reaction between one of the alkali metal withoxygen.

Rajah 3.1 menunjukkan susunan radas untuk tindakbalas antara salah satu logam

alkali dengan oksigen.

Figure 3.1

(a) Write the chemical equation for this reaction.

Tulis persamaan kimia untuk tindakbalas ini.

[3 marks]

3(a)

(b) State your observation when 10 cm3 of water which contained phenolphthalein is

poured into the gas jar after the reaction is stopped.Nyatakan pemerhatian anda bila 10 cm3 air mengandungi fenolftalein

dimasukkan ke dalam jar gas selepas tindak balas berhenti.

.

[1 mark]

3(b)

(c) Substance A which is located below sodium in the Periodic Table of Element isused to replace sodium in this experiment

Unsur A terletak dibawah natrium dalam Jadual Berkala Unsur digunakan

menggantikan natrium dalam eksperimen ini.

State your observation.

Nyatakan pemerhatian anda.

[1 mark]

3(c)

7

1

3

1

Sodium burntNatrium terbakar Oxygen gas

Gas oksigen


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(d) Table 3.2 shows the elements in period 3 of the Periodic Table of Elements.

Jadual 3.2 menunjukkan unsur-unsur dalam kala 3 Jadual Berkala Unsur.

Na Mg Al Si P S Cl Ar

Table 3.2

Jadual 3.2

Use information from Table 3.2 to answer the following questions.Gunakan maklumat dari Jadual 3.2 untuk menjawab soalan berikut.

(i) Why all these elements are located in period 3 ?

Kenapa semua unsur ini terletak dalan kala 3 ?

...

[1 mark]

3(d)(i)

(ii) State the changes of the atomic size of the elements across Period 3 from

left to right.

Nyatakan perubahan saiz atom apabila merentasi Kala 3 dari kiri kekanan.

...[1 mark]

3(d)(ii)

(iii) Explain your answer in (b)(ii).

Terangkan jawapan anda di (b)(ii).

..

..

..

[3 marks]

3(d)(iii)

Total A3

8

1

1

3

10


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4 Diagram 4.1 shows the apparatus set-up for the electrolysis of two electrolytes that is

molten lead(II) bromide in Cell I and 2.0 mol dm-3 sodium chloride solution in Cell IIusing carbon electrode P, Q, R and S

Rajah 4.1 menunjukkan susunan radas untuk elektrolisis dua elektrolit iaitu leburan

plumbum(II) bromida dalam Sel I dan larutan natrium klorida 2.0 mol dm-3

dalam SelII dengan menggunakan elektrod karbon P, Q, R dan S

Cell I Cell II

Sel I Sel IIDiagram 4.1

Rajah 4.1

(a) What is meant by electrolyte?

Apakah yang dimaksudkan dengan elektrolit?

...

...

[ 1 mark ]

4(a)

(b) Mark the positive electrode and negative electrode in Cell I

Tandakan elektrod positif dan negatif pada Sel 1

[ 1 mark ]

4(b)

(c) (i) State the observation at electrode P in Cell 1Nyatakan pemerhatian pada elektrod P dalam Sel 1

...[ 1 mark ]

4(c)(i)

(ii) Name the product at electrode P in Cell 1

Namakan hasil pada elektrod P dalam Sel 1

...

4(c)(ii)

9

1

1

1

1


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[ 1 mark ]

(d) Based on Cell II :Berdasarkan Sel II:

(i) State all the ions in the electrolyte

Nyatakan semua ion-ion yang hadir dalam elektrolit

...

[ 1 mark ]

4(d)(i)

(ii) In the table below, state the ions in (d)(i) which moved to electrodes R and

SDalam jadual di bawah, nyatakan ion-ion di (d)(i) yang bergerak ke

elektrod R dan S.

Electrode R

Elektrod R

Electrode S

Elektrod S

[ 2 marks ]

4(d)(ii)

(iii) Name the ion selectively discharged at electrode RNamakan ion yang dipilih untuk didiscas di elektrod R

...[ 1 mark ]

4(d)(iii)

(iv) Explain your answer in (d) (iii)Terangkan jawapan anda dalam d(iii).

...

[ 1 mark ]

4(d)(iv)

(v) Write a half equation for the reaction that occurs at electrode R

Tuliskan setengah persamaan bagi tindak balas yang berlaku dielektrod R

...[ 1 mark ]

4(d)(v)

Total A4

10

1

1

2

1

1

10


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5 Table 5.1 shows a result which are obtained when a student investigated the reaction

between 3.09 g of zinc granules and excess dilute sulphuric acid at 30oC .The gas wascollected and its volume is measured every 20 seconds.

Jadual 5.1 menunjukkan keputusan yang diperolehi bila seorang pelajar mengkaji

tindakbalas antara 3.09 g kepingan zink dengan asid sulfurik cair berlebihan padasuhu 30oC.Gas dikumpul dan isipadunya diukur setiap 20 saat.

Time/s 0 20 40 60 80 100 120 140 160

Vol/cm3 0 30 48 64 74 82 88 90 90

Table 5.1

Use information from Table 5.1 to answer the following questions.Gunakan maklumat dari Jadual 5.1 untuk menjawab soalan berikut

(a) Complete the diagram to show how the gas could be collected and its

volume measured.Lengkapkan rajah berikut untuk menunjukkan bagaimana gas dikumpul

dan isipadunya disukat. .

[ 2 marks ]

5(a)

(b) (i) Draw the graph of volume of gas collected against the time on the graph

paper provided based on the result at Table 5.1.

Lukiskan graf isipadu gas yang dikumpul melawan masa diatas kertasgraf yang disediakan berdasarkan keputusan pada Jadual 5.1.

[ 3 marks ]

5(b)(i)

11

Zinc

Zink

Sulphuric acid

Asid sulfurik

2

3


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12


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(ii) Based on the graph, calculate the rate of reaction at 40 seconds.Show the tangent on the graph at (b)(i) .

Berdasarkan graf yang diplot, kira kadar tindakbalas pada masa 40 saat.

Tunjukkan tangen diatas graf pada (b)(i).

[ 2 marks ]

5(b)(ii)

(c) The above experiment is repeated using the same mass of zinc powder and

excess dilute sulphuric acid at the same temperature. Sketch the graph of the

volume of gas produced against time on the same graph paper in (b)(i).Eksperimen diatas diulang menggunakan serbuk zink yang sama jisimnya dan

asid sulfurik cair yang berlebihan pada suhu yang sama . Lakarkan graf isipadu

gas yang dikumpul melawan masa pada kertas graf yang sama pada (b)(i).

[ 2 marks ]

5(c)

(d) Explain why the rate of reaction decrease with time ?

Terangkan mengapa kadar tindakbalas berkurang dengan masa ?

..

..

[ 1 mark ]

5(d)

Total A5

13

2

2

1

10


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Oxidation

Pengoksidan

Aluminium Oxide,Al2O3Aluminium oxida, Al2O3

+ H2(g) / Ni / Heat

+ H2(g) / Ni / Panaskan

6 Diagram 6.1 shows the conversion of organic compounds from one homologous

series to another and its chemical properties.Rajah 6.1 menunjukkan perubahan bagi sebatian organik dari satu siri homolog

kepada siri homolog lain dan sifat kimianya.

II

Diagram 6.1Rajah 6.1

(a) (i) Name the homologous series for propan-1-ol.Namakan siri homolog bagi propan-1ol.

.......[ 1 mark ]

6(a)(i)

(ii) Draw the structural formula for propan-1-olLukiskan formula struktur bagi propan-1-ol

[ 1 mark ]

6(a)(ii)

(b) Write the chemical equation for conversion ITuliskan persamaan kimia bagi perubahan I

...

[ 2 marks ]

6(b)

14

Propan-1-olPropan-1-ol

Hydrocarbon Y

Hidrokarbon Y

Compound XSebatian X

Carbon dioxide + water

Karbon dioksida + air

I

Hydrocarbon ZHidrokarbon Z

1

2

1

Aluminium oxide, Al2O3Aluminium oksida, Al2O3


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(c) Name compound X

Namakan sebatian X

...

[ 1 mark ]

6(c)

(d) (i) Name the reaction for conversion II

Namakan tindak balas bagi perubahan II

...

[ 1 mark ]

6(d)(i)

(ii) Draw the set- up of apparatus that can be used in conversion II.

. Lukiskan susunan radas yang boleh digunakan perubahan II.

[ 2 marks ]

6(d)(ii)

15

1

1

2


16/22

(e) Hexene and hexane are compounds in the same homologous series ashydrocarbon Y and hydrocarbon Z.

Diagram below shows the burning of hexene and hexane in air.

Heksena dan heksana adalah sebatian dalam siri homolog yang sama sepertihidrokarbon Y dan hidrokarbon Z

Rajah di bawah menunjukkan pembakaran heksena dan heksana dalam udara

Compare the sootiness of hexane and hexene. Explain.

Bandingkan kejelagaan bagi heksana dan heksena. Terangkan.

[ 2 marks ]

6(e)

Total A6

16

Porcelain dishMangkuk pijar

Filter paperKertas turas

Soot

Jelaga

Hexane

Heksana

Hexene

Heksena

2

10


17/22

Section B

[20 marks]

Answer any one question.

The time suggested to answer this section is 30 minutes.

7 (a) What is the meaning of rate of reaction?

Apakah maksud kadar tindak balas?

[1 mark](b) Table 7.1 shows the experiment which are carried out by a student.

Jadual 7.1 menunjukkan eksperimen yang dilakukan oleh seorang pelajar

Experiment I

II III

Set-up of

apparatus

Susunan radas

Hydrochloric

acid 0.1 moldm-3

Asid hidroklorik0.1 mol dm-3

0.2g magnesiumribbon

0.2 g pitamagnesium

Hydrochloric acid

0.5 mol dm-3

Asid hidroklorik0.1 mol dm-3

0.2 g magnesiumribbon

0.2 g pitamagnesium

Hydrchloric acid 0.5

mol dm-3 + copper (II)

sulphate solutionAsid hidroklorik 0.1

mol dm-3 + larutan

kuprum(II) sulfat

0.2 g magnesiumribbon

0.2 g pita magnesium

Temperature/oCSuhu

30 30 30

Time taken for

all the

magnesium todissolve/s

Masa diambiluntuk semua

magnesium

larut /s

50 20 15

Table 7.1

Jadual 7.1

17


18/22

(i) Write the chemical equation for the reaction between magnesium and

hydrochloric acid.Calculate the maximum volume of hydrogen gas produced.

Tuliskan persamaan kimia bagi tindakbalas antara magnesium dan asid

hidroklorik.Kira isipadu maksimum gas hydrogen yang dihasilkan.

[Relative atomic mass : Mg = 24; Molar gas volume = 24 dm mol-1 at room

condition][Jisim atom relative : Mg = 24; Isipadu molar = 24 dm mol-1 pada keadaan

bilik]

[5 marks]

(ii) Sketch the graphs for the volume of hydrogen gas against time forExperiments I, II and III on the same axes.

Di atas paksi yang sama , lakarkan graf bagi isipadu gas melawan masa

untuk Eksperimen I, II dan III

[3 marks](iii) Calculate the average rate of reaction for Experiments I, II and III in g s-1.

Kira kadar tindakbalas purata untuk Eksperimen I, II dan III dalam unitg s-!

[3 marks]

(iv) Compare the rates of reaction between Experiment I and Experiment II, and

between Experiment II and Experiment III.

With reference to collision theory, explain why there are differences in the

rates of reaction in the experiments.Bandingkan kadar tindakbalas antara Eksperimen I dengan Eksperimen II

dan antara Eksperimen II dengan Eksperimen III.

Dengan merujuk kepada Teori Perlanggaran , terangkan mengapa terdapatperbezaan tersebut.

[8 marks]

18


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8 (a) Using suitable examples, explain what is meant by

Dengan menggunakan contoh yang sesuai, terangkan apakah yang dimaksudkan

(i) Strong acid / asid kuat

(ii) Weak acid / asid lemah [4 marks]

(b) In a titration, 22.0 cm3 of 0.1 mol dm-3 sulphuric acid is required to neutralize 25.0 cm3 ofpotassium hydroxide solution.

Dalam satu pentitratan 22.0 cm3 asid sulfurik 0.1 mol dm-3 diperlukan untuk menuetralkan

25.0 cm3 larutan kalium hidroksida.

(i) Write the chemical equation of the reaction.

Tulis persamaan kimia bagi tindak balas ini.

(ii) Calculate the concentration of potassium hydroxide used in thisexperiment.

Hitung kepekatan larutan kalium hidroksida yang digunakan dalameksperimen ini.

[6 marks]

(c)

Describe a laboratory experiment to prepare a dry magnesium sulphate. In your description,include the chemical equation involved.

Huraikan satu eksperimen makmal untuk menyediakan garam magnesium sulfat yang kering.

Dalam huraian anda sertakan persamaan kimia bagi tindak balas yang terlibat.

[10 marks]

19

Magnesium sulphate is a soluble salt.Magnesium sulfat adalah garam terlarutkan.


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Section C

[20 marks]

Answer any one question.

The time suggested to answer this section is 30 minutes.

9 Substance X is a hydrocarbon compound. The empirical formula of substance X is CH2 .Given that the relative atomic mass of C = 12 , H = 1 and Relative Molecular Mass X = 56

Bahan X ialah sebatian hidrokarbon. Formula empirik bagi bahan X ialah CH2.

Diberi jisim atom relatif bagi C=12, H=1 dan Jisim Molekul Relatif X = 56

(a) State the meaning of hydrocarbon.

Nyatakan maksud hidrokarbon

[1 mark]

(b) Determine the molecular formula of substance X.

Tentukan formula molekul bagi bahan X.[3 marks]

(c) Based on the answer in 9(b), draw the structural formula for all the isomers of X.Name the isomers

Berdasarkan jawapan di 9(b), lukiskan formula struktu r bagi semua isomer X.

Namakan isomer tersebut.

[6 marks]

(d) You are required to prepare ethyl butanoate. The chemical supplied areAnda dikehendaki menyediakan etil butanoat. Bahan kimia yang dibekalkan adalah

Butanoic acid

Asid butanoik

Ethanol

Etanol

Concentrated sulphuric acidAsid sulfurik pekat

Describe a laboratory experiment to prepare ethyl butanoate. In your description, include

the observation and the chemical equations involved.

Huraikan suatu eksperimen makmal bagi menyediakan etil butanoat. Dalam huraian andanyatakan pemerhatian dan tuliskan persamaan kimia yang terlibat.

[10 marks]

20


21/22

10 (a) Name an industrial process to manufacture ammonia.

Namakan proses industri bagi menghasilkan ammonia.[1 mark]

(b) Explain briefly how ammonia are produce in (a). In your explanation include

the chemical equation, catalyst used, temperature and pressure of the process.Terangkan secara ringkas bagaimana ammonia dihasilkan di(a). Dalam

penerangan anda tuliskan persamaan kimia sertakan nyatakan mangkin, suhu

dan tekanan yang digunakan dalam proses ini.[7 marks]

(

c)

With the help of labeled diagram, describe a laboratory experiment to compare

the hardness of alloy and pure copper .

Dengan bantuan rajah berlabel , terangkan eksperimen yang boleh dijalankandi makmal untuk membandingkan kekerasan aloi dan kuprum tulen

[10 marks]

(d) Figure 10.1 shows one of the product which is made from composite.

Name the composite and state one property of the composite.Rajah 10.1 menunjukkan barangan yang dibuat dari komposit. Namakan

komposit tersebut dan nyatakan satu sifatnya.

Figure 10.1

Rajah 10.1

[2 marks]

END OF QUESTION PAPERKERTAS SOALAN TAMAT

21

Bronze is harder than pure copper.

Gangsa lebih keras dari kuprum tulen

Helmet

Topi keledar


22/22

22

ujian pengesanan pertengahan tahun 2009_chemistry 2

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