peperiksaan percubaan chemistry paper 2 trial spm 2013

7/29/2019 Peperiksaan Percubaan Chemistry Paper 2 TRIAL SPM 2013

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Section ABahagian A

[ 60 marks][ 60 markah ]

Answerall questions in this sectionJawab semua soalan dalam bahagian ini.

1 Table 1.1 shows five substances and their respective formulaeJadual 1.1 menunjukkan lima bahan dengan formula kimia masing-masing.

SubstanceBahan

Chemical formulaFormula kimia

IodineIodin

I2

LithiumLithium

Li

Acetamide.Asetamida

CH3CONH2

Magnesium oxideMagnesium oksida

MgO

Copper oxideKuprum oksida

CuO

Table 1.1Jadual 1.1

(a) State one compound from Table 1 which exists as a moleculeNyatakan satu sebatian dari Jadual 1 yang wujud sebagai molekul.

.[1 mark]

(b) Name the process of change in state of matter when solid iodine is heated to formiodine gas.Namakan proses perubahan keadaan jirim apabila pepejal iodine menjadi gas apabiladipanaskan

.[1 mark]

(c) Graph 1.2 shows the temperature against time when liquid acetamide is cooled from90oC to 30oC.Graf 1.2 menunjukkan graf suhu melawan masa apabila cecair acetamida disejukkandari 90oC kepada 30oC.


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Temperature/oC

90

82

30

Time/st0 t1 t2 t3

Graph 1.2

(i) What is meant by freezing point ?Apakah yang dimaksudkan dengan takat beku ?

...[1 mark]

(ii) Based on Graph 1.2, state the freezing point of acetamide.Berdasarkan Graf 1.2, nyatakan takat beku bagi acetamida.

...[1 mark]

(iii) Explain why there is no change in temperature from t1 to t2 .Terangkan mengapa tiada perubahan suhu dari t1 ke t2.

...

...[2 marks]

(d) Diagram 1.3 represent an atomic structure of lithium atom.Rajah 1.3 mewakili struktur atom bagi atom litium.

Diagram 1.3

2


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(i) What do the symbols below represent ?Apakah yang diwakili oleh simbol-simbol di bawah.

[1 mark]

(ii) Calculate the nucleon number of lithium.Hitungkan nombor nukleon bagi litium.

[1 mark]

(e) Empirical formulae for magnesium oxide and copper oxide can be determine by twodifferent method.Formula empirik bagi magnesium oksida dan kuprum oksida boleh ditentukan dengandua kaedah yang berbeza.

You are given combustion tube with a small hole at the end, glass tube, retort standand clamp, stopper, copper oxide and dry hydrogen.Draw the set-up of apparatus for the experiment to determine empirical formula ofcopper oxide.

Anda dibekalkan dengan tiub pembakaran berlubang kecil dihujungnya, tiub kaca, kakiretot dengan pemegang, gabus, kuprum oksida dan gas hidrogen kering.Lukiskan susunan radas bagi eksperimen menentukan formula empirik kuprum oksida.

[2 marks]

3


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2 Table 2.1 shows some of the elements found in Period 3 of the Periodic Table of Elementsand their respective proton numbers.Jadual menunjukkan sebahagian unsur yang terdapat pada kala 3 di dalam jadual berkalaunsur dan bilangan nombor protonnya.

Table 2.1

Based on this table , answer the following questions.Berdasarkan jadual,jawab soalan-soalan yang berikut.

(a) Choose one elements that is non-metal.Pilih satu unsur yang bukan logam.

.[1 mark]

(b) (i) Write the electron arrangement for atom argon.Tuliskan susunan elektron bagi atom argon.

...[1 mark]

(ii) Explain why argon is chemically inert.Terangkan mengapa argon tidak reaktif secara kimia

...[1 mark]

(c) State one of the uses of silicon in our daily life.Nyatakan salah satu kegunaan silikon dalam kehidupan seharian.

.[1 mark]

(d) (i) What will happen to the atomic radius of the element as we go across Period 3of the Periodic Table of Elements from sodium to argon?

Apakah yang akan terjadi kepada jejari atom bagi sesuatu unsur jika merentasi

Kala 3 dalam Jadual Berkala Unsur dari natriumhingga ke argon.

...[1 mark]

4

Element

Unsur

Sodium Magnesium Aluminium Silicon Chlorine Argon

ProtonNumber

Nombor

Proton

11 12 13 14 17 18

Table 2.1Jadual 2.1


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(ii) Explain your answer in d(i)Terangkan jawapan anda di d(i).

...

...

...[3 marks]

(e) When sodium is burnt in chlorine gas , a white solid is obtained .Apabila natrium dibakar di dalam gas klorin,pepejal putih terbentuk.

(i) Write the equation for the reaction.Tuliskan persamaan kimia bagi tindak balas tersebut.

...[1 mark]

(ii) Name the type of chemical bonds that are formed in the product.Tuliskan jenis ikatan yang terbentuk di dalam hasil tersebut.

...[1 mark]

3 Figure 3.1 shows a voltaic cell.Rajah di bawah menunjukkan sebuah sel kimia.

Figure 3.1

(a) What is the energy conversion that takes place in cell above.Apakah perubahan tenaga yang berlaku dalam sel di atas.

.[1 mark]

(b) (i) State the negative terminal of the cell.Nyatakan terminal negative sel tersebut.

[1 mark]

5


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(ii) Explain your answer in (b) (i).Terangkan jawapan anda di (b) (i).

[1 mark]

(c) State the colour change in iron(II) sulphate solution?Nyatakan perubahan warna larutan ferum(II) sulfat.

[1 mark]

(d) What is the function of the salt bridge in this experiment.Apakah fungsi titian garam dalam experiment ini.

.[1 mark]

(e) On the diagram, draw arrows to indicate the direction of the electron flow.Pada rajah, lukis arah aliran electron.

..[1 mark]

(f) At which electrode does oxidation occur? Explain your answer in term of electrontransfer.Pada elektrod manakah berlaku proses pengoksidaan? Terangkan jawapan anda darisegi pemindahan elektron.

...

[2 marks]

(g) Write the half equation at anode.Tulis setengah persamaan di anod.

[1 mark]

(h) 0.056 g iron metal is deposited at iron electrode. Calculate the number of iron atomsdeposited ?0.056 g logam ferum terenap pada elektrod ferum. Hitung bilangan atom ferum yangterenap.[Relative atomic mass : Fe, 56; Avogadros constant = 6.02 x 1023]

6


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[1 mark]

4. Diagram 4.1 shows the apparatus used in the titration process between an aqueouspotassium hydroxide solution and dilute sulphuric acid using indicator A.Rajah 4.1 menunjukkan proses pentitratan antara larutan akueus kalium hidroksidadengan asid sulfurik cair dengan menggunakan penunjuk A.

Diagram 4.1/ Rajah 4.1(a) Name

Namakan:(i) Apparatus P

Radas P: ....................................................................................................

(ii) Indicator APenunjuk A : ....................................................................................................

[2 marks][2 markah]

(iii) Based on answer in (a)(ii), state the colour change of the solution in conical flaskat the end point.Berdasarkan jawapan di (a)(ii), nyatakan perubahan warna larutan dalamkelalang kon pada takat akhir.

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

(b) (i) Write a balanced chemical equation for the reaction between potassium hydroxidesolution with sulphuric acid.Tulis persamaan kimia yang seimbang bagi tindak balas antara larutan kaliumhidrosida dengan asid sulfurik.

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

7


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[2 marks][2 markah]

(ii) In this experiment, 10.00 cm3 of dilute sulphuric acid was needed to neutralisecompletely 25.0 cm3 of 1.0 mol dm-3 potassium hydroxide solution. Calculatethe molarity of the dilute sulphuric acid.Dalam eksperimen ini, 10.00 cm3asid sulfurik cair diperlukan untukmeneutralkan dengan lengkap 25.0 cm3 larutan kalium hidroksida 1.0 mol dm-3.

Hitung kemolaran asid sulfurik cair.

[2 marks][2 markah]

(c) Table 4.2 shows ethanoic acid, CH3COOH in three different states and the observationsthat obtained when tested with moist blue litmus paper.Jadual 4.2 menunjukkan asid etanoik yang berada dalam tiga keadaan berbeza dan

pemerhatian yang diperolehi apabila diuji dengan kertas litmus biru lembab.

(i) Name the ion which is responsible for changing the colour of blue litmus paper tored.Namakan ion yang menyebabkan perubahan pada warna kertas litmus birukepada merah.

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

8


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[1 markah]

(ii) Explain why there is no change on blue litmus paper in Experiment III. Terangkan mengapa tiada perubahan pada kertas litmus biru dalam Eksperimen III.

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

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

....................................................................................................................[2 marks][2 markah]

5. (a) Bronze is an alloy of copper.Gangsa ialah satu aloi untuk kuprum.

(i) Name the element that is added to copper to form bronze.Namakan unsur yang ditambahkan kepada kuprum untuk membentukgangsa.

[1 mark][1 markah]

(ii) Explain why bronze is harder than pure copper.Terangkan mengapa gangsa lebih keras daripada kuprum tulen.

.

.

.

[2 marks][1 markah]

(iii) Draw the arrangement of particles in pure copper and bronze.Lukiskan susunan zarah di dalam kuprum tulen dan gangsa.

9

Pure copper

Kuprum tulen

BronzeGangsa


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[2 marks](b) Diagram 5 shows an industrial preparation of sulphuric acid by the Contact

Process.Rajah 5 menunjukkan penghasilan secara industri asid sulfurik melalui ProsesSentuh.

(i) State the name of compound X.Nyatakan nama sebatian X.

[1 mark][1 markah]

(ii) Write a chemical equation of the reaction at stage II.

Tuliskan persamaan kimia bagi tindakbalas peringkatII.

[1 mark][1 markah]

(iii) The chemical equation below shows the reaction between sulphur andoxygen gas at Stage I.Persamaan kimia di bawah menunjukkan tindak balas antara sulfur dangas oksigen padaPeringkatI.

S + O2 SO2

Calculate the maximum volume of sulphur dioxide gas produced if 48 g ofsulphur is burnt completely in oxygen gas.[Relative atomic mass of S = 32, O = 16 and the molar volume of any gasis 24 dm3 mol-1 at room temperature and pressure]

Hitungkan isipadu maksimum sulfur dioksida yang terhasil jika 48 g sulfurterbakar lengkap dalam gas oksigen.[Jisim atom relatif S = 32, O = 16 dan isipadu molar sebarang gas adalah24 dm3 mol-1pada suhu dan tekanan bilik]

10

S SO2

SO3

X H2SO

4

Oxygen /

OksigenConcentrated H

2SO

4/

H2SO

4pekat

Water /

Air

Stage I /

PeringkatI

Diagram 5/Rajah 5

Stage II /

PeringkatIIStage III /

PeringkatIII

Stage IV /

PeringkatIV

Oxygen /

Oksigen


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[3 marks][3 markah]

6 The thermochemical equation below represents the combustion reaction of an alcohol in theair.Persamaan termokimia dibawah mewakili tindak balas pembakaran suatu alkohol di udara.

C4H9OH + 6O2 4CO2 + 5H2O H = -2679 kJ mol-1

(a) (i) State the name of the alcohol in the above equation.Nyatakan nama alkohol di dalam persamaan di atas.

[1 mark][1markah]

(ii) What is meant by H = -2679 kJ mol-1 in the above equation?Apakah yang dimaksudkan dengan H = -2679 kJ mol-1\ dalam persamaandi atas?

[1 mark][1markah]

(b) 0.37g of the alcohol that is named in (a), used to heat 500 g of water.0.37g alkohol yang dinamakan di (a), digunakan untuk memanaskan 500 g air.Calculate,Hitungkan,

(i) the heat released by the alcohol in the reaction.[Molar mass of the alcohol = 74 g mol -1]haba yang dibebaskan oleh alkohol itu dalam tindak balas[Jisim molar alkohol = 74 gmol-1]

[1 mark][1markah]

the temperature change of water expected in the experiment in (b)[Specific heat capacity of water: 4.2 J g-1oC-1]perubahan suhu air yang dijangkakan dalam eksperimen ini.

[Haba tentu air: 4.2 J g-1oC-1]

[2 marks][2markah]

11


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Draw the energy level diagram for the combustion of the alcohol.Lukiskan gambar rajah aras tenaga untuk pembakaran alkohol tersebut.

[2 marks][2markah]

Table 6 shows the heat of combustion of various alcohols.Jadual6 menunjukkan haba pembakaran pelbagai alkohol.

Number ofcarbon atomsBilangan atom

karbon

Molecular formulaFormula molekul

Name of alcoholNama alkohol

Heat ofcombustion

Haba pembakara(kJ mol-1)

1 CH3OH Methanol -7262 C2H5OH Ethanol -1376

3 C3H7OH Propanol .4 C4H9OH -2679

5 C5H11OH Pentanol -3332

Table 6

Jadual6Predict the heat of combustion of propanol.Ramalkan haba pembakaran bagi propanol.

[1 mark]

[1markah]

Based on Table 6, explain why as the number of carbon atoms increases so doesthe value of heat of combustion.Berdasarkan Rajah 6, terangkan mengapa apabila bilangan atom karbonbertambah nilai haba pembakaran juga bertambah.

12


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[2 marks][2markah

]Section B

Bahagian B

[20 marks][20 markah]

Answer any one question from this sectionJawab mana-mana satusoalan daripada bahagian ini.

7 (a) Ethene gas is bubble through bromine water.Gas etena dialirkan melalui air bromin.

(i) What is the observation and state the type of reaction happens?Apakah pemerhatian dan nyatakan jenis tindak balas yang berlaku?

(ii) Give the name and draw the structure formula of the molecule of the product.Berikan nama dan lukis formula struktur bagi molekul hasil tindak balas.

[4 marks][4 markah]

(b) A hydrocarbon Z contains 82.75% of carbon by mass.Satu hidrokarbon Z mengandungi82.75% karbon mengikut jisim.[Relative atomic mass: H=1, C=12][Jisim atom relatif: H=1, C=12]

(i) Calculate the empirical formula of Z.

Hitungkan formula empirikZ.

(ii) Determine the molecular formula of Z if relative molecular mass of Z is 58.Tentukan formula molekul bagiZjika jisim molekul relatifZ adalah 58.

[7 marks][7 markah]

(c) Compare the properties of vulcanised rubber and unvulcanised rubber.Bandingkan sifat-sifat getah tervulkan dan getah tak tervulkan.

Your answers should be included the following properties of rubber:

Jawapan anda hendaklah mengandungi sifat-sifat getah seperti berikut:

(i) ElasticityKekenyalan

(ii) Strength and hardnessKekuatan dan kekerasan

(iii) Resistance toward oxidationKetahanan terhadap pengoksidaan

Give the reasons for all the properties above.Berikan sebab bagi semua sifat-sifat di atas.

13


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[9 marks][9 markah]

8. Figure 8 shows the electron arrangement for atoms P, Q and R.Rajah 8 menunjukkan susunan elektron bagi atom-atom P, Q dan R.

Based on figure 8, answer the following questions:Berdasarkan rajah 8, jawab soalan-soalan berikut:

(a) (i) State the location of atom R in the Periodic Table of Elements.Nyatakan kedudukan atom R dalam Jadual Berkala Unsur.

(ii) Explain how you determine the group and the period of atom R.Terangkan bagaimana anda menentukan kumpulan dan kala bagiatom R.

[5 marks][5 markah]

(b) Atoms P and Q can form chemical bonds with atom R.Atom P dan Q boleh membentuk ikatan kimia dengan atom R.

State the type of chemical bond and explain how the bond is formedbetween:Nyatakan jenis ikatan kimia dan terangkan bagaimana ikatan terbentukantara:(i) Atoms P and R(ii) Atoms Q and R


(c) State one physical property of the compound formed in (b) (i) and thecompound formed in (b) (ii). Explain the differences in the physical propertystated.Nyatakan satu sifat fizik bagi sebatian yang terbentuk di (b)(i) dan bagisebatian yang terbentuk di (b)(ii). Terangkan perbezaan bagi sifat fizik yangdinyatakan.

[4 marks][4 markah]

14

PQ R

Atom P Atom Q Atom R


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Section C[20 marks]

Answer anyone question.(Jawab mana-mana satusoalan)

9. (a) An oxidising agent in a reaction can also become a reducing agent inanother reaction. Discuss this statement based on the reactionsrepresented by the following equations :Satu agen pengoksidaan dalam suatu tindak balas boleh juga menjadiagen penurunan dalam tindak balas yang lain. Bincangkan pernyataan iniberdasarkan tindak balas yang ditunjukkan dalam persamaan berikut:

i) )(2)(2)()(2 322

aqBraqFeaqBraqFe++

++

ii) )()()()(22

aqZnsFesZnaqFe++

++ [4 marks]

[4 markah]

(b) Displacement reaction between magnesium and copper(II) sulphatesolution can also be classified as a redox reaction. With the aid of half-equations, explain the above statement in terms of change in oxidation

number.Tindak balas penyesaran antara magnesium dan larutan kuprum(II) sulfatboleh juga dikelaskan sebagai satu tindak balas redoks. Dengan bantuansetengah persamaan, jelaskan pernyataan di atas dari segi perubahandalam nombor pengoksidaan.

[4 marks][4 markah]

(c) (i) State the meaning of oxidation and reduction in terms of electrontransfer.Nyatakan maksudpengoksidaan danpenurunan dari segi pemindahanelektron. [2 marks]

[2 markah]

(ii) A student intends to investigate the redox reaction on the transfer ofelectrons at a distance. Diagram 9 shows the set up of apparatus used bythe student.Seorang pelajar ingin menyiasat tentang tindak balas redoks melalui

pemindahan elektron pada satu jarak. Rajah 9 menunjukkan susunanradas yang telah digunakan oleh pelajar tersebut.

DIAGRAM 9

15

Bromine water

Air bromin

Dilute sulphuric acid

Asid sulfurik cair

Iron(II)sulphatesolution

Larutan ferum(II)

sulfat

Carbon electrode

Positive terminalCarbon electrodeNegative terminal


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Describe the oxidation and reduction processes in terms of electrontransfer that occur at the negative and positive terminals. Write the halfequation for the reaction that takes place at each terminal. State thechanges that can be observed after 10 minutes.Terangkan proses pengoksidaan dan penurunan yang berlaku di terminalnegatif dan terminal positif dari segi pemindahan elektron. Tuliskansetengah persamaan bagi tindak balas yang berlaku di setiap terminal.Nyatakan perubahan yang dapat diperhatikan selepas 10 minit.


A group of pupils carried out two experiments to study the rate of reaction betweenmagnesium and two acids, hydrochloric acid and acid T. Table 10 shows the data fromExperiment I and Experiument II.

Sekumpulan murid telah menjalankan dua eksperimen untuk mengkaji kadar tindak balasantara magnesium dengan dua asid, asid hidroklorik dan asidT.Jadual10 menunjukkandata daripada Eksperimen I dan Eksperimen II.

ExperimentEksperimen

ReactantsBahan tindak balas

ProductsHasil tindak balas

ObservationPemerhatian

I

0.6 g magnesium ribbonand 30 cm3 hydrochloricacid 2.0 mol dm-3

0.6 g pita magnesiumdengan 30 cm3hydrochloric acid2.0 mol dm-3

Magnesiumchloride andhydrogen gas

Magnesium kloridadan gas hidrogen

The temperatureof the mixtureincreases.

Suhu campuranmeningkat

II

0.6 g magnesium ribbonand 30 cm3 acid T 2.0mol dm-3

0.6 g pita magnesiumdengan 30 cm3 acidT2.0 mol dm-3

Magnesiumsulphate andhydrogen gas

Magnesium sulfatdaan gas hidrogen

The temperatureof the mixtureincreases.

Suhu campuranmeningkat

Table 10Jadual10

Referring to Experiment II, state the name of acid T used.Write the chemical equation for the reaction of acid T with magnesium.

Merujuk Eksperimen II, nyatakan nama asidT yang digunakan.Tuliskan persamaan kimia bagi tindak balas asidT dengan magnesium.

[2 marks[2 markah

16


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(ii) Draw an energy profile diagram for the reaction in 10(a)(i).On the energy profile diagram show the:

Activation energy without a catalyst, Ea

Activation energy with catalyst, Ea

Heat of reaction, H

Explain the energy profile diagram

Lukis satu gambar rajah profil tenaga untuk tindak balas di10(a)(i).Pada gambar rajah profil tenaga itu tunjukkan:

Tenaga pengaktifan tanpa mangkin, Ea

Tenaga pengaktifan dengan mangkin, Ea

Haba tindak balas, HJelaskan gambar rajah profil tenaga itu.

[10 marks[10 markah

(b) The graph in Diagram 10 shows the results of Experiment I and Experiment II.Graf pada Rajah 10 menunjukkan keputusan bagi Eksperimen I dan Eksperimen II

Volume of hydrogen gas/cm3

Isipadu gas hidrogen/cm3

400

Experiment II Eksperimen 1I

Experiment I Eksperimen I

200

0 100 200 Time /s Masa/s

Diagram 10Rajah 10

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Based on the graph:Berdasarkan graf

Calculate the average rate of reaction for Experiment IHitungkan kadar tindak balas purata bagi Eksperimen I

[2 mar[2 marka

(ii) Explain the difference in the rate of reaction between Experiment I and Experiment Terangkan perbezaan kadar tindak balas antara Eksperimen I dengan Eksperimen I

[6 mark[6 marka

KERTAS SOALAN TAMAT

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peperiksaan percubaan chemistry paper 2 trial spm 2013

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