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Chemistry

Kertas 2

Ogos/September

2011

2 hrs

PEJABAT PELAJARAN DAERAH MELAKA TENGAH

LATIH TUBI PROGRAM PERKONGSIAN PINTAR ( CO )

BIDANG SAINS DAN MATEMATIK

SEKOLAH MENENGAH

DAERAH MELAKA TENGAH

SPM 2011

CHEMISTRY

Kertas 2

Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Tulis nombor kad pengenalan danangka giliran anda pada ruangan

yang disediakan.

2. Kertas soalan ini adalah dalam

Bahasa Inggeris.

3. Calon dibenarkan menjawab

keseluruhan atau sebahagian soalan

sama ada dalam bahasa Inggeris

atau bahasa Melayu.

4. Calon dikehendaki membaca

maklumat di halaman belakang

kertas soalan ini.

Kertas soalan ini mengalami 20 halaman

bercetak.

Section A

[ 60 marks ]

Untuk Kegunaan Pemeriksa

Bahagian SoalanMarkah

Penuh

Markah

Diperolehi

A

1 10

2 10

3 10

4 10

5 9

6 11

B

7 20

8 20

C

9 20

10 20

Jumlah

Nama: ________________________

Kelas: 5 ____________


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Answer all questions in this section.Bahagian A

[60 markah]

Jawab semua soalan dalam bahagian ini.

1. Diagram 1 shows two sets of apparatus set up in an experiment to investigate the

movement of particles in water at different temperatures.

Rajah 1 menunjukkan dua set radas ekxperiment yang disusun untuk mengkajipergerakan zarah dalam air pada suhu yang berlainan.

PotassiumManganate(VII)

Kaliummanganat (VII) Diagram 1

Rajah 1

(a) (i). Name the process involved in this experiment.

Namakan proses yang terlibat dalam eksperimen ini.

..

[1 mark / 1markah]

(ii) What type of particles are present in potassium mangnate(VII)? Apakah jenis zarah yang wujud dalam kalium manganat (VII)?

..[1 mark / 1

markah]

(iii) Compare the rates at which the particles move in set I and set II.

Bandingkan kadar di mana zarah bergerak dalam set I dan set II.

..

[1 mark / 1

markah](iv) Explain your answer in (a)(iii).

Terangkan jawapan anda di (a)(iii)

..

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[2 marks / 2 markah]

(b) The freezing point of acetamide was determined by using the cooling method.The graph of temperature against time was plotted as shown in Diagram 2.

Takat beku asetamida ditentukan dengan kaedah penyejukan. Graf suhu lawan masa

diplot seperti pada Rajah 2.

Diagram 2Rajah 2

(i) From the graph, state the freezing point of the acetamide.

Daripada graf, nyatakan takat beku asetamida.

.

[1 mark/ 1markah]

(ii) What is the physical state of the acetamide at the section of the curve from R to S:

Apakah sifat fizikal asetamida pada lengkung graf di antara R ke S

.

[1 mark/1 markah]

(iii) It was observed from the graph that there was no change in temperature from S to

T. Explain the observation.

Diperhatikan dan graf didapati tidak ada perubahan suhu dan S ke T.

Terangkan pemerhatian.

..

..[2 marks/2 markah]

(iv) Explain why the temperature of the acetamide decreases from T to U.

Terangkan mengapa suhu asetamida menurun pada bahagian graf dari T ke U.

...


3

X


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...

[1 mark/1 markah]

2. Table 2 shows some information of the particles, U, V, W, X and Y.Jadual 2 menunjukkan maklumat tentang beberapa zarah, U, V, W, X dan Y.

Particle Proton Number Nucleon Number Number Of

ElectronU 11 23 11

V 17 35 17

W 17 36 18

X 18 38 18

Y 19 39 18

Table 2

Jadual 2

Answer the following questions based on the information given in Table 2 by using theletters as symbols of the elements.

Jawab soalan berikut berdasarkan maklumat yang diberi dalam Jadual 2 dengan

menggunakan huraf-huruf sebagai symbol unsur.

(a) (i) State the number of neutrons in U.

Nyatakan bilangan neutron dalam U

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

[ 1 mark]

(ii) Which two particles are isotopes?Manakah dua antaranya adalah isotop?

[ 1 mark ](iii) Give a reason for your answer in (a)(ii).

Beri sebab untuk jawapan anda di (a)(ii).

[1 mark ]

(b) Write the electron arrangement for particle Y. Tulis susunan electron untuk zarah Y.

.[ 1 mark ]

(c) (i) Which group does the element of particle X belong to? Apakah kumpulan unsur bagi zarah X ?

[ 1 mark ]


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3 Diagram 3 shows the set up of cells, P and Q.

Rajah 3 menunjukkan susunan bagi 2 sel, P dan Q.

Diagram 3Rajah 3

(a) In Diagram 3, mark ( X ) in the box provided to show which electrode is the cathode in

cell P.Explain your answer.

Dalam Rajah 3, tanda (X ) dalam petak yang disediakan untuk menunjukkan elektrodyang manakah merupakan katod dalam sel P.

Jelaskan jawapan anda.

[2 marks]

(b) State the change in energy in cell Q.

Nyatakan perubahan tenaga yang berlaku pada sel Q.

..

[1 mark]

(c) (i) What observation can be recorded at the cathode of cell P?Apakah pemerhatian dapat dicatatkan pada katod sel P?

..[ 1 mark]

(ii) Write the half equation to account for the observation in (c) (i).

Tulis persamaan separa untuk menyokong pemerhatian di (c) (i).

..[ 1 mark](iii) State the half reaction that takes place in (c) (ii).

Nyatakan tindak balas setengah yang berlaku di (c) (ii).

..[ 1 mark]


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(d) The observation for the electrolyte in cell P and cell Q is the same.State the observation and explain your answer.

Pemerhatian bagi elektrolit dalam sel P dan sel Q adalah sama.

Nyatakan pemerhatian tersebut dan jelaskan jawapan anda.

..

..[2 marks]

(e) Copper(II) sulphate solution in cell P is replaced with dilute sulphuric acid.A colourless

gas is produced at the cathode and the gas is collected.Describe one chemical test to

identify the gas produced.

Larutan kuprum(II) sulfat dalam sel P digantikan dengan asid sulfurik cair. Gas takberwarna dihasil pada katod dan dikumpulkan.

Huraikan satu ujian kimia untuk mengenalpasti gas yang dihasilkan.

..

..[2 marks]

4 Diagram 4 shows a series of reactions of a zinc carbonate..


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Rajah 4 menunjukkan satu siri tindak balas bagi sebatian P.

(a) (i) State the observation in step I.

Nyatakan pemerhatian pada langkah I.

[ 1 mark](ii) Name solid Q.

Namakan pepejal Q

..

[1 mark]

(iii) Draw a labelled diagram of the apparatus that can be set up in step I andat thesame time to identify gas R.

Lukis gambarajah untuk menunjukkan susunan radas dalam langkah I dan pada

masa yang sama untuk mengengenalpastikan gas R

[ 2 marks]

(iv) Write the chemical equation for the reaction in step I.

Tulis persamaan kimia bagi tindak balas yang berlaku pada langkah I.

..[2 mark]

(b) Calculate the mass of solid Q that will be formed if 6.25 g of zinc carbonate is

heated until no further change.[ Relative atomic mass : C = 12; O = 16; Zn = 65.]


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Zinc CarbonateZinc karbonat

Solid Q + gas RPepejal Q gas R

Solution ULarutan U

Precipitate VMendakan V

HeatPanaskan

Acid T

Asid T

Sodium hydroxide solutionLarutan natrium hidroksida

Diagram 4Rajah 4

I

II

III


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Kirakan jisim pepejal Q yang akan terbentuk jika 6.25g zink karbonat dipanaskan

sehingga tiada perubahan lagi

[Jisim atom relative : C = 12; O = 16; Zn = 65.]

[2 mark]

(c) When solution U is boiled until saturated, a sulphate salt is obtained upon cooling.

Name the acid T. Bila larutan U dididih sehingga tepu, satu garam sulfat didapati bila disejkkan.

Namakan asid T

[1 mark]

(d) In step III, what will happen to precipitate V if sodium hydroxide solution isadded until in excess?

Dalam langkah III, apakah akan berlaku kepada mendakan V jika larutan

natrium hidroksida ditambah sehingga berlebihan?

.

[1 mark]

5. Diagram 5 shows how latex is processed to form vulcanised rubber.

Rajah 5 menunjuk bagaimana susu getah diproses untuk membentukkan getah tervulkan


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pressed intosheet and

smoked


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...

[1 mark]

(f) What happens to the polymers of rubber during vulcanisation to produce the

property as in (e)?

Apakah yang terjadi kepada polimer getah semasa pemvulkanan untuk menghasilkan sifat

di (e)?

...

[1 mark]

6. Diagram 6 shows an apparatus set-up to investigate the reaction between potassium iodide

solution and chlorine water through the transfer of electrons at a distance.Rajah 6 menunjukkan susunan radas untuk mengkaji tindak balas antara larutan kalium iodida

dan air klorin melalui pemindahan elektron pada satu jarak.


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Diagram 6

Rajah 6

(a) (i) State the type of reaction that takes place in Diagram 6

Nyatakan jenis tindak balas yang berlaku dalam Rajah 6

[ 1 mark ]

(ii) In Diagram 6, draw the flow of electrons .Dalam Rajah 6, lukis pengaliran electron yang berlaku.

[ 1 mark ]

(b) (i) What is the change in colour of the solution around electrode P ?Apakah perubahan warna terhadap larutan di sekeliling elektrod P

..

[ 1 mark ]

(ii) Give a chemical test to confirm the product formed at electrode P.

Berikan satu ujian kimia untuk menentukan hasil terbentuk pada elektrod P.

..

[ 2 marks ]

(c) (i) Name the process that occurs at electrode Q.

Namakan proses yang berlaku di elektrod Q.

[ 1 mark ]


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Larutan Kalium

iodida

Elektrod karbon

Air klorin

Asid sulfuric

cair


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(ii) Write the half-equation for the reaction that occurs at electrode Q.Tulis persamaan setengah bagi tindak balas yang berlaku di elektrod Q.

[ 1 mark ]

(d) Write the overall ionic equation for the reaction that occurs.

Tulis persamaan ion bagi tindak balas seluruh yang berlaku.

[ 2 mark ]

(e) Name the reducing agent in this reaction.

Namakan agen reduksi dalam tindak balas ini.

..

[ 1 mark ]

(f) Suggest another reagent that can replace potassium iodide solution.Cadangkan satu lagi reagen yang boleh menggantikan larutan kalium iodide.

.....

[ 1 mark ]

Section B

[20 marks]

Answer any one question from this section.

Bahagian B[20 markah]


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Jawab mana-mana satu soalan dari bahagian ini.

7. Table 7 shows the chemical symbols which represent 4 elements : W, X, Y and Z.

Jadual 7 menunjukkan simbol-simbol kimia yang mewakili empat unsur : W, X, Y dan Z

ElementUnsur

Proton numberNombor proton

Nucleon numberNombor nukleon

W 6 12

X 8 16

Y 11 23

Z 18 38

Table 7Jadual 7

(a) Write the electron arrangement of atoms X and Z.

Tulis susunan electron bagi atom X dan Z.[2 marks]

(b) Z exists as monoatomic gas and X as diatomic gas.

Explain this statement by using electron arrangement.

Z wujud sebagai gas monoatom dan X ialah gas dwiatom.Terangkan pernyataan ini dengan menggunakan susunan electron.

[6 marks]

(c) Two different compounds can be formed from the elements given in Table 7.

Dua sebatian yang berlainan boleh dibentukkan daripada unsur-unsur dalamJadual 7.

(i) Explain how an ionic compound is formed from the elements given.

Terangkan bagaimana satu sebatian ion dibentukkan dari unsur-unsur yangdiberi.

[8 marks]

(ii) Explain the electrical conductivity of the compound formed in (c) (i)Terangkan kondukiviti elektrik bagi sebatian terbentuk dalam (c) (i).

[4 marks]8. (a) A student has made a hypothesis as shown below.


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Copper(II) sulphate acts as a catalyst for the reaction between zincmetal and an acid.


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You are required to describe the steps of an experiment how you can collect datato show the truth of the above hypothesis.

Your answer must include also a known acid, the set up of the apparatus, how

you arrive at a conclusion.

Seorang pelajar telah buat hipotesis seperti di bawah:

Anda dikehendaki menghuraikan satu eksperimen untuk mengumpul data untuk

membuktikan kebenaran hipotesis di atas.

Jawapan anda mestilah termasuk satu asid yang dinamakan, susunan radas,bagaimana anda sampai ke suatu kesimpulan.

[12 marks]

(b) (i) State the Collision Theory.

Nyatakan Teori Perlanggaran.

(ii) With the use of the energy profile diagram for a reaction, explain what ismeant by the terms activation energy and effective collision.

Dengan menggunakan gambarajah aras tenaga bagi satu tindak balas,

terangkan maksud tenaga pengaktifan dan perlanggaran berkesan.

(iii) By using the Collision Theory, explain the effect of catalyst on the rate of

the reaction in (a).Dengan menggunakan Teori Perlanggaran, terangkan kesan mangkin atas

kadar bagi tindak balas di (a).

[8 marks]

Section C

[20 marks]

Answer any one question from this section.

Bahagian C

[20 markah]Jawab mana-mana satu soalan dari bahagian ini.


Kuprum(II) sulfat bertindak sebagai mangkin untuk tindak balas antaralogam zink dan satu asid.

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Na2CO

3+2HCl

2NaCl + CO2

+ H2O

EnergyTenaga

H = negativeH = negatif

Experiment 2

Eksperimen 2

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9. Diagram 9 shows the energy level for two different reactions.Rajah 9 menunjuk aras tenaga bagi dua tindak balas yang berlainan.

Diagram 9

Rajah 9

(a) (i) State the types of reactions for each experiment.

Nyatakan jenis tindak balas untuk setiap eksperimen.[2 marks]

(ii) Compare the energy content for the reactants and products for the

two experiments above.Bandingkan kandungan tenaga bagi bahan-bahan dan hasil-hasil tindak

balas untuk kedua-dua eksperimen di tas.

[ 2 marks]

(iii) Explain your answer in (a) (ii) with reference to breaking and formation of bonds.Terangkan jawapan anda di (a) (ii) dengan merujuk kepada pemecahan dan

pembentukan ikatan.[5 marks]

(b) The thermochemical equation for the precipitation of silver chloride is as shown

below:


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Experiment I

Eksperim e n I

NaCl + CO2

+ H2O

Energy

Tenaga

H = positiveH = positif

AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq) H = -68kJmol-1

NaHCO3+ HCl


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Persamaan termokimia untuk pemendakan argentum klorida adalah seperti berikut:

(i) What is the meant by heat of precipitation of silver chloride?

Apa yang dimaksudkan dengan haba pemendakan argentum klorida?[2 marks]

(ii) When sodium chloride solution is replaced by hydrochloric acid of the

same concentration and volume, predict the heat of precipitation.

Explain your answer.

Apabila larutan natrium klorida diganti oleh asid hidroklorik dengan isipadu dankepekatan sama, ramalkan haba pemendakan.

Terangkan jawapan anda.

[4 marks]

(c) Another experiment was carried out to determine the heat of neutralization between amonobasic acid and sodium hydroxide solution. The following data was obtained:

Calculate the value of the heat of the neutralisation.

Give an example of a monobase acid, then write the thermochemical equation for the

reaction that takes place. [Specific heat capacity of water is 4.2 J g -1 oC-1 ]

Satu lagi eksperimen dijalankan untuk menentu haba peneutralan antara satu asid

monobes dan larutan natrium hidroksida.Data berikut didapati:

Hitungkan nilai haba peneutralan itu.

Beri satu contoh asid monobes, kemudian tulis persamaan termokimia bagi tindak balas

yang berlaku.[Muatan haba tertentu air ialah 4.2 J g-1 oC-1 ]

[5 marks]

10. (a) (i) Give an example of alloy.

Beri satu contoh aloi.

(ii) Explain why the alloy is harder than the pure metal .

Terangkan mengapa aloi itu adalah lebih keras daripada logam tulennya.

[ 4 marks]

(b) (i) What is soap ?


50 cm3 of 2.0 mol dm-3 of hydrochloric acid was added to 50 cm3 of2.0 mol dm-3 of sodium hydroxide solution.

The increase in temperature of the mixture is 13 oC.

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AgNO3(ak) + NaCl(ak) AgCl(p) + NaNO3(ak) H = -68kJmol-1

50 cm3 asid hidrockorik 2.0 mol dm-3 ditambah kepada 50 cm3 larutan natriumhidroksida 2.0 mol dm-3.Peningkatan suhu campuran adalah 13 oC.


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Apakah sabun[2 marks]

(ii) Explain why soap is not effective in washing in acidic water.Terangkan mengap asabun adalah tidak berkesan untuk mencuci dalam air

berasid.

[3 marks]

(iii) Explain how you can overcome the problem in (b)(ii)

Terangkan bagaimana anda boleh mengatasi masalah dalam (b) (ii)

[3 marks]

(c) (i) State two reasons for using food additives in food processing.

Nyatakan dua sebab untuk menggunakan bahan tambah makanan.

[2 marks]

(ii) State two different types of food additives with different functions.

Give an example for each type of food additive and explain their functions.

Nyatakan dua jenis bahan tambah makanan dengan fungsi yang berlainan.

Beri satu contoh untuk setiap jenis bahan tambah makanan itu dan terangkanfungsi mereka.

[6 marks]

End Of Question PaperAkhir Kertas Soalan


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INFORMATION FOR CANDIDATES

1. This question paper consists of three sections :Section A, Section B and Section C.

2. Answer all questions in Section A. Write your answers for Section A in the spaces

provided in this question paper.

3. Answer one question from Section B and one question from Section C. Write youranswers for Section B and Section C on your own writing paper.

You may use equations, diagrams, tables, graphs and other suitable methods toexplain your answers.

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

5. Marks allocated for each question or sub-part of a question are shown in brackets.

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

7. If you wish to change your answer, cross out the answer that you have done. Thenwrite down the new answer.

8. The Periodic Table of Elements is provided on the last page of this examination

booklet.

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

10. You are advised to spend 90 minutes to answer questions in Section A , 30 minutesfor Section B and 30 minutes for Section C.

11. Hand in your answer sheets for Section B and C together with this question paper to theinvigilator at the end of the examination.


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