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1 CHEMISTRY Kertas 1 Ogos 1 ¼ jam BAHAN KECEMERLANGAN (BK 9) SIJIL PELAJARAN MALAYSIA 2015 CHEMISTRY Kertas 1 Satu jam lima belas minit JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU 1. Kertas ini mengandungi 50 soalan. 2. Jawab semua soalan. 3. Tiap-tiap soalan diikuti oleh empat jawapan, iaitu A, B, C dan D. Bagi setiap soalan, pilih satu jawapan sahaja. Hitamkan jawapan anda pada kertas jawapan objektif yang disediakan. 4. Jika anda hendak menukar jawapan, padamkan tanda yang telah dibuat. Kemudian hitamkan jawapan yang baharu. 5. Rajah yang mengiringi soalan tidak dilukis mengikut skala kecuali dinyatakan. 6. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan. 4541/1 JPNT BK9 2015 [see next page CONFIDENTIAL 4541/1

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1SULIT 4541/1

CHEMISTRY Kertas 1Ogos1 ¼ jam

BAHAN KECEMERLANGAN (BK 9)

SIJIL PELAJARAN MALAYSIA 2015

CHEMISTRY

Kertas 1

Satu jam lima belas minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Kertas ini mengandungi 50 soalan.

2. Jawab semua soalan.

3. Tiap-tiap soalan diikuti oleh empat jawapan, iaitu A, B, C dan D. Bagi setiap soalan, pilih satu jawapan sahaja. Hitamkan jawapan anda pada kertas jawapan objektif yang disediakan.

4. Jika anda hendak menukar jawapan, padamkan tanda yang telah dibuat. Kemudian hitamkan jawapan yang baharu.

5. Rajah yang mengiringi soalan tidak dilukis mengikut skala kecuali dinyatakan.

6. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan.

Kertas soalan ini mengandungi 31 halaman bercetak

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1 The following information describes X.Maklumat berikut menghuraikan X.

What is represented by X?Apakah yang diwakili X?

A IsotopesIsotop

B IsomersIsomer

C Transition elements Unsur peralihan

D MolMol

2 The average mass of copper atom in 64 times greater than of the mass of a carbon-12

atom. State the relative atomic mass of copper.

Purata jisim satu atom kuprum ialah 64 kali lebih besar daripada jisim satu atom karbon-12.

Nyatakan jisim atom relatif bagi kuprum.

A 5

B 12

C 64

D 128

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Atoms of the same element but different number of neutrons.Atom unsur yang sama tetapi mempunyai bilangan neutron yang berbeza.

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3 Which of the following elements A, B, C or D in the Periodic Table exists as monoatomic gas?Antara unsur A, B, C atau D dalam Jadual Berkala. Yang manakah wujud sebagai gas monoatom?

4 Which of the following statement best explains the low melting point of covalent compounds?Antara pernyataan berikut, yang manakah paling tepat menerangkan mengapa takat lebur sebatian kovalen adalah rendah?

A Covalent bond is weakIkatan kovalen adalah lemah

B The intermolecular forces are weakDaya tarikan antara molekul adalah lemah

C Covalent compounds are volatileSebatian kovalen meruap

D Covalent compounds exist as gas at room temperatureSebatian kovalen wujud sebagai gas pada suhu bilik

5 What is the meaning of electrolytes?Apakah maksud elektrolit?

A Metals that can conduct electricity.Logam yang mengkonduksikan elektrik dalam keadaan pepejal.

B Elements that conduct electricity in molten state.Unsur yang mengkonduksikan elektrik dalam keadaan leburan.

C Compounds that can conduct electricity in any state.Sebatian yang mengkonduksikan elektrik dalam sebarang keadaan.

D Compounds that can conduct electricity in molten state or aqueous solution.Sebatian yang mengkonduksikan elektrik dalam keadaan leburan atau larutan akueus.

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A B CD

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6 Acid rain causes the land to become acidic. Which of the following substances can be used by farmers to neutralise the acidity in the soil?Hujan asid menyebabkan tanah menjadi berasid. Antara berikut, bahan yang manakah boleh digunakan oleh para petani untuk meneutralkan keasidan dalam tanah?

A SulphurSulfur

B Calcium oxideKalsium oksida

C Sodium chloride Natrium klorida

D Ammonium nitrateAmmonium nitrat

7 Which of the following compound will produce brown gas when heatedAntara sebatian berikut, yang manakah akan menghasilkan gas berwarna perang apabila dipanaskan?

A Zinc chlorideZink klorida

B Sodium chlorideNatrium klorida

C Magnesium nitrateMagnesium nitrat

D Copper(II) carbonateKuprum(II) karbonat

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8 Diagram 1 shows dental filling material used to fill cavities caused by tooth decay.Dental amalgam is an alloy of mercury (50%), silver (~22-32%), tin (~14%) and copper (~8%).Rajah 1 menunjukkan tampalan amalgam yang digunakan untuk memenuhi kaviti disebabkan oleh gigi berlubang.Tampalan gigi amalgam ialah aloi daripada raksa (50%), argentum (~22-32%), timah (~14%), dan kuprum (~8%).

Diagram 1Rajah 1

In your opinion, why is amalgam used in dental filling?Pada pendapat anda, mengapakah amalgam digunakan sebagai tampalan gigi?

A StrongKuat

B Expensive

Mahal

C Not long lastingTidak tahan lama

D Likely to breakMudah patah

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9 Which of the following define the rate of reaction correctly ?Yang manakah di antara berikut mendefinisikan kadar tindak balas dengan betul?

A

B

C

D

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10 Diagram 2 shows a structural formula of compound U.Rajah 2 menunjukan formula struktur bagi sebatian U.

H H O H C C C OH

H H

Diagram 2Rajah 2

Name the homologous series for compound U.Namakan siri homolog bagi sebatian U.

A AlkeneAlkena

B AlcoholAlkohol

C Carboxilic asidAsid karboksilik

D EsterEster

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11 The rusting of iron will only occur in the presence of:Pengaratan besi hanya akan berlaku di dalam kehadiran:

I Water Air

II Hydrogen ion Ion hidrogen

III Oxygen Oksigen

IV Acid Asid

A I and III dan II

B I and IIII dan III

C II and IVII dan IV

D III and IVIII dan IV

12 The following chemical equation shows the reaction of the formation of magnesium 4541/1 JPNT BK9 2015 [see next page

CONFIDENTIAL

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carbonate.Persamaan kimia berikut menunjukkan tindak balas pembentukan mendakan magnesium karbonat.

Which of the following is true about the reaction?Antara berikut, yang manakah benar tentang tindak balas itu?

Heat changePerubahan haba

Type of reactionJenis tindak balas

AHeat is releasedHaba dibebaskan

EndothermicEndotermik

BHeat is absorbed

Haba diserapExothermicEksotermik

CHeat is releasedHaba dibebaskan

ExothermicEksotermik

DHeat is absorbed

Haba diserapEndothermicEndotermik

13 Which of the following food additives is an antioxidant?Antara bahan tambah makanan berikut yang manakah adalah pengantioksida?

A Benzoic acidAsid benzoik

B Ascorbic acidAsid askorbik

C Sodium nitrateNatrium nitrat

D Ethyl ethanoateEtil etanoat

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14 Diagram 3 shows the cooling curve for a sample of a pure substance XRajah 3 menunjukkan lengkuk penyejukan bagi satu contoh bahan X yang tulen.

tTime / sMasa / s

Temperature / °CSuhu / °C

Diagram 3Rajah 3

Which of the following statements is true about the arrangement of particles at time t?Antara berikut, yang manakah pernyataan yang benar tentang susunan zarah-zarah pada masa t?

A All the molecules move freelySemua zarah bergerak bebas

B All the molecules only vibrate and rotate at their fixed positionSemua zarah hanya bergetar dan berputar pada kedudukan yang tetap

C Some of the molecules move from one point to another and the others move randomlySebahagian zarah bergerak dari satu tempat ke tempat yang lain dan yang lainnya bergerak bebas

D Some of the molecules vibrate and rotate at their fixed positions and the others move from one point to anotherSebahagian zarah bergetar dan berputar pada kedudukan yang tetap dan yang lainnya bergerak dari satu tempat ke tempat yang lain

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15 A balloon contains 6.02 × 1022 of a gas particles.What is the number of mole of the gas in the ballon?Sebiji belon mengandungi 6.02 × 1022 zarah-zarah gas. Berapakah bilangan mol gas itu dalam belon tersebut?

A 0.01 mol

B 0.02 mol

C 0.1 mol

D 0.2 mol

16 Z forms an ionic compound with chlorine with an empirical formula of ZCl2. Which of the following could be the electron arrangement of atom Z?Z membentuk satu sebatian ionik dengan klorin dan formula empiriknya ialah ZCl2.Antara berikut, yang manakah susunan elektron bagi atom Z?

A 2.7

17 Why metals are not considered as electrolytes eventhough they conduct electricity?Mengapakah logam tidak dianggap sebagai elektrolit walaupun mengkonduksikan elektrik?

A They have high melting point.Mempunyai takat lebur yang tinggi.

B They conduct electricity in solid state.Mengkonduksikan elekrik dalam keadaan pepejal.

C They are not decomposed by the passage of electric currentTidak terurai oleh laluan arus elektrik

D They do not dissolve in water to form aqueous solutionTidak larut dalam air untuk membentuk larutan akueus

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B 2.8.1

C 2.8.6

D 2.8.8.2

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18 Element X is located in Group 14 of the Periodic Table. Element Y has a proton number of 17. Which of the following shows the formula and type of compound formed when element X combines with element Y?Unsur X terletak di Kumpulan 14 dalam Jadual Berkala. Unsur Y mempunyai nombor proton 17. Antara berikut yang manakah menunjukkan formula dan jenis sebatian yang terbentuk apabila unsur X berpadu dengan unsur Y?

FormulaFormula

Type of CompoundJenis Sebatian

A XY2IonicIonik

B X4YCovalentKovalen

C XYIonicIonik

D XY4CovalentKovalen

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19 Table 1 shows the observations in an electrical conductivity test for acids.Jadual 1 menunjukkan pemerhatian dalam ujian kekonduksian elektrik bagi dua asid.

Acid Asid

Observation Pemerhatian

0.1 mol dm-3 HX acid0.1 mol dm-3 asid HX

Bulb lights up brightly.Mentol lampu menyala dengan terang

0.1 mol dm-3 HY acid0.1 mol dm-3 asid HY

Bulb lights up dimly.Mentol lampu menyala dengan malap

Table 1Jadual 1

Which of the following is true about the two acids?Antara berikut, yang manakah benar tentang dua asid itu?

A Acid HX is strong acid, while HY acid is weak acid.HX adalah asid kuat manakala HY adalah asid lemah.

B Acid HX has a higher pH value than HY acid.Asid HX mempunyai nilai pH yang lebih tinggi daripada asid HY.

C Both acids show the same chemical reactivity.Kedua-dua asid menunjukkan kereaktifan kimia yang sama.

D Both acids undergo complete dissociation in water.Kedua-dua asid mengalami penceraian lengkap dalam air.

20 Which of the following reagents will produce zinc sulphate salt? Antara campuran berikut, yang manakah dapat menyediakan garam zink sulfat?

A Zinc nitrate is added to sulphuric acidZink nitrat dicampur kepada asid sulfurik

B Zinc oxide is added to sulphuric acidZink oksida dicampur kepada asid sulfurik

C Zinc hydroxide is added to sulphuric acidZink hidroksida dicampur kepada asid sulfurik

D Zinc chloride is added to sulphuric acidZink klorida dicampur kepada asid sulfurik

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21 A hydrocarbon contains six carbon atoms and it has the characteristics below.Satu hidrokarbon terdiri daripada enam atom karbon dan mempunyai ciri-ciri seperti berikut.

What is the molecular formula of the hydrocarbon?Apakah formula molekul bagi hidrokarbon itu?

A C6H14

B C6H12

C C6H10

D C6H14O

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Decolourises the purple colour of acidified potassium manganate(VII)Melunturkan warna ungu kalium manganat(VII) berasid

Produces more sootMenghasilkan jelaga yang banyak

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22 Diagram 4 shows the run-off of heavy load of pollutant X that make their way into rivers, fertilizing blooms of algae that deplete oxygen and leave vast "dead zones" in the river.Salt X is produced from the products of Haber Process and Contact Process.Rajah 4 menunjukkan sungai yang tercemar oleh lebihan garam X yang mengalir dari kebun sayur di tebing sungai. Pencemaran ini telah menyebab pertumbuhan pesat algae dan rumpair menyebabkan kekurangan oksigen ikan dan hidupan air lain mati.Garam X disediakan daripada tindak balas antara hasil proses Haber dan proses Sentuh.

Diagram 4Rajah 4

What is salt XApakah garam X?

A Ammonia Ammonia

B Sulphuric acidAsid sulfuric

C Ammonium sulphateAmmonium sulfat

D Ammonium phosphateAmmonium fosfat

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Kebun sayur

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23 Two experiments were conducted by a group of Form 5 students to investigate the rateof reaction between calcium carbonate and nitric acid as shown in Table 2.Dua eksperimen telah dijalankan oleh sekumpulan pelajar Tingkatan 5 untuk menyiasat kadar tindakbalas di antara kalsium karbonat dengan asid nitrik seperti yang ditunjukkan dalam Jadual 2.

ExperimentEksperimen

Calcium carbonate

Kalsium karbonat

Nitric acid, HNO3

Asid nitrik

Mass (g)

Jisim(g)

Physical form

Bentuk fizikal

Volume(cm3)

Isipadu (cm3)

Concentration(mol dm-3)Kepekatan(mol dm-3)

R 6GranuleButiran

100 0.1

S 6PowderSerbuk

50 0.2

Table 2Jadual 2

Which of the

following graphs represent the two experiments?Antara graf berikut, yang manakah mewakili kedua-dua eksperimen itu?

A Volume of CO2/cm3

Isipadu CO2/cm3

Time/s Masa/s

B Volume of CO2/cm3

Isipadu CO2/cm3

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R

S

R

S

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17SULIT 4541/1

Time/s Masa/s

C Volume of CO2/cm3

Isipadu CO2/cm3

Time/s Masa/s

D Volume of CO2/cm3

Isipadu CO2/cm3

Time/s Masa/s

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R

S

S

R

S

R

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24 Metal X is located between tin and zinc in the reactivity series metals. Which of the following pairs of metals can reduce X oxide?Logam X berada di antara stanum dan zink dalam siri kereaktifan logam. Antara berikut, pasangan logam yang manakah boleh menurunkan X oksida?

I AluminiumAluminium

II Copper Kuprum

III Magnesium Magnesium

IV Lead Plumbum

A I and III dan II

B I and IIII dan III

C II and IVII dan IV

D III and IVIII dan IV

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25 The following thermochemical equation shows a reaction.Based on the equation, which statement is correct?Persamaan termokimia berikut menunjukkan satu tindak balas.Berdasarkan persamaan itu, pernyataan manakah yang betul?

CuO + H2 → Cu + H2O; ∆H = + 130.5 kJ

A The reaction is exothermicTindak balas adalah eksotermik

B The activation energy is 130.5 kJ mol-1

Tenaga pengaktifan ialah 130.5 kJ mol-1

C The temperature of the mixture decreasesSuhu campuran berkurang

D The total energy of the reactants is higher than the productsJumlah tenaga bahan tindak balas adalah lebih tinggi daripada hasil tindak balas.

26

Which of the following is the correct sequence in soap preparation?Yang manakah di antara berikut adalah urutan yang betul bagi penyediaan sabun?

A X, Y, Z, W

B X, Y, W, Z

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X: Add 50 cm3 of sodium hydroxide solution to 10 cm3 of oil. Tambah 50 cm3 larutan natrium hidroksida kepada 10 cm3 minyak.

Y: Filter out the mixture and wash with a little distilled water. Turas campuran dan basuh dengan sedikit air suling.

Z: Add 50 cm3 of distilled water to the mixture. Tambah 50 cm3 air suling kepada campuran.

W: Heat the mixture until it boils and stir with a glass rod. Panaskan campuran sehingga mendidih dan kacau dengan rod kaca.

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C X, W, Z, Y

D X, W, Y, Z

27 Element R has a nucleon number of 27 and its ion is R3+ with an electron arrangement of 2.8. The number of neutrons in an atom of element R is..Unsur R mempunyai nombor nukleon 27 dan susunan elektron bagi R3+ adalah 2.8. Nombor neutron untuk unsur R ialah...

A 11

B 12

C 13

D 14

28 Diagram 5 shows the arrangement of electrons for ion produced from atom Q.Rajah 5 menunjukkan susunan elektron bagi ion yang terbentuk daripada atom Q.

Diagram 5

Rajah 5

Which of the following statement is true about Q?Antara berikut, yang manakah benar mengenai Q?

A Atom Q is located in Group 1 of the Periodic Table

Atom Q terletak dalam Kumpulan 1 Jadual Berkala.

B Atom Q has 7 electrons in its valence shellAtom Q mempunyai 7 elektron pada petala valensnya

C Atom Q is an inert gas Atom Q adalah gas lengai

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X

X

X

X

X

XX

XX

X

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D Atom Q has achieved the octet electron arrangementAtom Q telah mencapai susunan oktet

29 Diagram 6 shows the electron arrangement of a carbon dioxide molecule.Rajah 6 menunjukkan susunan elektron bagi molekul karbon dioksida.

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

A One carbon atom requires two electrons to achieve the octet electron arrangement.Satu atom karbon memerlukan dua elektron untuk mencapai susunan elektron oktet.

B Each oxygen atom contributes one electron for sharing. Setiap atom oksigen menyumbang satu elektron untuk dikongsi.

C Four double covalent bonds are formed in a carbon dioxide molecule.Empat ikatan kovalen gandadua terbentuk dalam molekul karbon dioksida.

D One carbon atom contributes four electrons to be shared by two oxygen atoms Satu atom karbon menyumbang empat elektron untuk dikongsi dengan dua atom oksigen.

30 The molecular formula of ethyl ethanoate is CH3COOC2H5.What is the empirical formula of ethyl ethanoate?Formula molekul etil etanoat ialah CH3COOC2H5.Apakah formula empirik etil etanoat?

A CHO

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Diagram 6Rajah 6

O C O

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B CH2O

C C2H4O

D C4H8O2

31 Table 3 shows information about three voltaic cells. Metal J, K, L and M are used as electrodes in the cells.Jadual 3 menunjukkan maklumat tentang tiga sel voltan. Logam-logam J, K, L dan M digunakan sebagai elektrod dalam sel itu.

Voltaic cellSel voltan

Negative terminal Terminal negatif

Positive terminalTerminal positif

Voltage (V)Voltan (V)

I J K 2.5

II J L 1.7

III M L 0.8

Table 3Jadual 3

What is the order of the metals based on the increasing of electropositivity ?Apakah susunan logam berdasarkan kelektropositifan menaik ?

A J, K, L, M

B K, M, L, J

C K, L, M, J

D J, M, L, K

32 Which of the following statements is true about both hydrochloric acid and sulphuric acid with the same concentration?Antara pernyataan berikut, yang manakah benar tentang kedua-dua asid hidroklorik dan asid sulfurik dengan kepekatan yang sama?

A Have the same basicityMempunyai kebesan yang sama

B Have the same pH valueMempunyai nilai pH yang sama

C Have the same chemical propertiesMempunyai sifat kimia yang sama

D Have the same concentration of hydrogen ions

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Mempunyai kepekatan ion hydrogen yang sama

33 Diagram 7 shows the cation test in solution XRajah 7 menunjukkan ujian kation dalam larutan X

Diagram 7Rajah 7

Which of the following ion is present in solution X?Antara yang berikut, ion manakah yang mungkin terdapat dalam larutan X?

A Ca2+

B Mg2+

C NH4+

D Zn2+

34 A student had done a reaction between zinc granules with sulphuric acid. What he should do to make the reaction becomes shorter?Seorang pelajar telah melakukan tindak balas antara butiran zink dengan asid sulfurik. Apakah yang perlu dia lakukan untuk memendekkan masa tindakbalas tersebut ?

A Adding the volume of sulphuric acidMenambah isipadu asid sulfurik

B Heating the mixture of the reactionMemanaskan campuran tindak balas

C Adding distilled waterMenambahkan air suling

D Using bigger size of conical flaskMenggunakan saiz kelalang kon yang lebih besar

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Solution XLarutan X

Sodium hydroxide solutionLarutan natrium hidroksida

White precipitate soluble in excess sodium hydroxideMendakan putih larut dalam larutan natrium hidroksida berlebihan

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35 Diagram 8 shows the smokestack emission by a factory. The main component in the smoke caused the air pollution in the area. This gas is the by-product of combustion of fossil fuel.Rajah 8 menunjukkan asap yang dikeluarkan daripada sebuah kilang. Bahan utama dalam asap itu menyebabkan pencemaran alam sekitar di kawasan tersebut. Bahan ini merupakan hasil sampingan kegiatan industri daripada pembakaran bahan api fosil.

Diagram 8Rajah 8

By applying your knowledge in chemistry, suggest a suitable chemical to treat the pollutant.Dengan menggunakan pengetahuan kimia anda, cadangkan satu bahan kimia yang sesuai yang boleh digunakan untuk merawat bahan itu.

A Sulphuric acidAsid sulfurik

B Sodium hydroxideNatrium hidroksida

C DetergentsDetergen

D Coal Arangbatu

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CO2

SO2

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36 Diagram 9 represents the structural formula of a carbon compoundRajah 9 mewakili formula struktur bagi satu sebatian karbon.

Diagram 9Rajah 9

The compound is produced by the reaction betweenSebatian ini dihasilkan melalui tindakbalas antara

A Ethanol and propanoic acidEtanol dan asid propanoik

B Butanol and ethanoic acidButanol dan asid etanoik

C Ethanol and butanoic acidEtanol dan asid butanoik

D Propanol and propanoic acidPropanol dan asid propanoik

37 When magnesium is immersed in hydrochloric acid, a colourless gas is liberated. What happen to magnesium and hydrogen in the acid?Apabila magnesium direndam di dalam asid hidroklorik, gas tak bewarna dibebaskan. Apakah yang akan terjadi pada magnesium dan hidrogen di dalam asid?

MagnesiumMagnesium

HydrogenHidrogen

AIs oxidisedDioksidakan

Is reducedDiturunkan

BIs reducedDiturunkan

Is oxidisedDioksidakan

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CGains an electronMenerima elektron

Loses an electronKehilangan elektron

DLoses an electronKehilangan elektron

Gains an electronMenerima elektron

38 Which energy profile diagram shows the lowest activation energy?Rajah profil tenaga manakah yang menunjukkan tenaga pengaktifan paling rendah?

A

B

C

D

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0 00 0

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Energy (kJ)Tenaga

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Tenaga

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39 The electron arrangement of atom P is 2.8.5 and atom Q has 2 valence electrons. What is the type of bond and formula of compound formed between P and Q?Susunan elektron bagi atom P ialah 2.8.5 dan atom Q mempunyai 2 elektron valens.Apakah jenis ikatan dan formula sebatian yang terbentuk antara P dan Q?

Type of bondJenis ikatan

Formula of compoundFormula sebatian

AIonicIon

PQ2

BIonicIon

Q3P2

CCovalentKovalen

P2Q3

DCovalentKovalen

QP2

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1 The word equation below shows how compound X, a food additive is prepared.Persamaan perkataan di bawah menunjukkan bagaimana sebatian X, sejenis bahan tambah makanan disediakan.

Carboxylic acid + alcohol → compound X + waterAsid karbosilik + alkohol → sebatian X + air

What is the use of compound X?Apakah kegunaan sebatian X?

A Flavouring agent Perisa

B Thickening agent Agen pemekat

C Colouring Pewarna

D AntioxidantPengantioksida

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40 Copper (II) sulphate solution is electrolysed using copper elctrodes. What can be observed at the anode and the cathode after 30 minutes?Larutan kuprum (II) sulfat dielektrolisiskan menggunakan elektrod kuprum. Apakah yang diperhatikan pada anod dan katod selepas 30 minit?

AnodeAnod

CathodeKatod

ACopper plate becomes thinner

Plat kuprum menjadi nipisCopper plate becomes thicker

Plat kuprum menjadi tebal

BCopper plate becomes thinner

Plat kuprum menjadi nipisGas bubbles are released

Gelembung gas terbebas

CCopper plate becomes thicker

Plat kuprum menjadi tebalCopper plate becomes thinner

Plat kuprum menjadi nipis

DGas bubbles are released

Gelembung gas terbebasCopper plate becomes thicker

Plat kuprum menjadi tebal

41 The molarity of calcium hydroxide solution is 0.2 mol dm-3.What is the concentration of the alkali in g dm-3?[Relative atomic mass: H = 1, O = 16, Ca = 40]Kemolaran larutan kalsium hidroksida ialah 0.2 mol dm-3.Berapakah kepekatan alkali itu dalam g dm-3?[Jisim atom relatif: H = 1, O = 16, Ca = 40]

A 11.4

B 11.6

C 14.8

D 19.4

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42 A student would like to prepare calcium sulphate salt also known as ‘Plaster of Paris’. Plaster of Paris’ is use to support broken bones. Table 4 shows the chemical reagents in the laboratory and the experimental procedure to prepare the salt. Seorang pelajar ingin menyediakan garam kalsium sulfat yang juga dikenali sebagai “Plaster of Paris”. “Plaster of Paris” digunakan untuk menyokong tulang yang patah. Jadual 4 menunjukkan bahan-bahan kimia yang terdapat di dalam makmal dan langkah-langkah kaedah penyediaan garam.

Chemical reagentBahan kimia

Experimental procedureLangkah eksperimen

Calcium oxideKalsium oksida

L1Mix the chemicalCampurkan bahan kimia

Calcium carbonateKalsium karbonat

L2Heat the mixturePanaskan campuran

Calcium nitrateKalsium nitrat

L3Filter the mixtureTuraskan campuran

Sulphuric acidAsid sulfurik

L4Cool the filtrateSejukkan hasil turasan

Sodium nitrateNatrium nitrat

L5Rinse the residue with distilledBilas baki turasan dengan air suling

L6Dry the saltKeringkan garam

Table 4Jadual 4

Which pair of chemical reagent and experimental procedure is the correct to produce calcium sulphate salt?Pasangan bahan kimia dan kaedah manakah betul untuk menghasilkan garam kalsium sulfat?

Chemical reagentBahan kimia

Experimental procedureLangkah experimen

A Q + S L1, L3, L5, L6

B R + T L1, L3, L5, L6

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C P + T L1, L2, L3, L4, L6

D Q + T L1, L2, L3, L4, L6

43 Table 5 shows the volume of carbon dioxide gas are collected at regular time intervals for the reaction between calcium carbonate with hydrochloric acid.Jadual 5 menunjukkan isipadu gas karbon dioksida yang dikumpul pada sela masa tertentu bagi tindak balas antara kalsium karbonat dengan asid hidroklorik.

Time/sMasa/s

0 30 60 90 120 150 180

Volume of carbon dioxide gas/cm3

Isipadu gas karbon dioksida /cm3 0.00 27.50 46.50 60.00 65.50 68.00 68.00

Table 5Jadual 5

What is the average rate of reaction for the first 60 seconds?Apakah kadar tindak balas purata bagi 60 saat pertama?

A 0.378 cm3 s-1

B 0.453 cm3 s-1

C 0.775 cm3 s-1

D 1.500 cm3 s-1

44 Which of the following reactions is an oxidation reaction?Antara tindakbalas berikut yang manakah adalah tindakbalas pengoksidaan?

A

B

C

D

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45 Diagram 10 shows the structural formula of carbon compound X.Rajah 10 menunjukkan struktur formula bagi sebatian karbon X.

Diagram 10Rajah 10

Which of the following statement are true ?Antara pernyataan berikut adalah benar ?

A Name of the compound X is buteneNama sebatian X ialah butena.

B Empirical formula of compound X is C4H8

Formula empirik sebatian X ialah C4H8

C Compound X is an unsaturated hydrocarbonSebatian X adalah hidrokarbon tak tepu.

D Complete combustion of compound X produce carbon dioxide gas and waterPembakaran lengkap sebatian X menghasilkan gas karbon dioksida dan air.

46 Iron is extracted from haematite, Fe3O3 by reduction with coke but not electrolysis becauseBesi diekstrakkan daripada haematit, Fe3O3 melalui penurunan dengan arang kok tetapi bukan dengan elektrolisis kerana

A The melting point of haematite is too high.Takat lebur haematit terlalu tinggi.

B Reduction with coke is economical than electrolysis.Penurunan dengan arang kok lebih ekonomi berbanding elektrolisis.

C Electrolysis takes place for very reactive metals.Elektrolisis berlaku bagi logam yang reaktif.

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D Iron reacts very well with coke.Besi bertindak balas dengan baik sekali dengan arang kok.

47 Diagram 11 shows the set-up apparatus for the electrolysis of diluted sodium chloride solution. Rajah 11 menunjukkan susunan radas bagi elektrolisis larutan natrium klorida cair.

Diagram 11Rajah 11

Which of the following statements is not true to describe the change that takes place?Antara penyataan berikut, yang manakah tidak benar untuk menerangkan perubahan yang berlaku?

A Oxidation occurs at the anode.Pengoksidaan berlaku pada anod.

B Bubbles of gas are observed at both electrodesGelembung gas diperhatikan pada kedua-dua elektrod

C Chlorine ions are oxidized at the anodeIon klorida dioksidakan pada anod

D Hydrogen ions are reduced at the cathodeIon hidrogen diturunkan pada katod

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Carbon electrodeElektrod karbon

Diluted aqueous sodium chlorideNatrium klorida akueus

Carbon electrodeElektrod karbon

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48 Diagram 12 shows the mercury level of a thermometer in a reaction.Rajah 12 menunjukkan aras merkuri bagi suatu thermometer dalam satu tindak balas.

Diagram 12Rajah 12

Which of the following is true about the reaction.Antara yang berikut, yang manakah benar tentang tindak balas ini?

A Endothermic reactionTindak balas endotermik

B Exothermic reactionTindak balas eksotermik

C Bond breaking in the reactants absorbs energyPemecahan ikatan dalam bahan tindak balas menyerap haba

D The amount of energy in the product is higher than of reactantsKandungan tenaga hasil tindak balas adalah lebih tinggi daripada kandungan tenaga bahan tindak balas.

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Before reactionSebelum tindak balas

After reactionSelepas tindak balas

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49 In an experiment, 2.4 g of magnesium powder is added to 100 cm3 of 2.0 mol dm-3 copper(II) sulphate solution.The temperature of the mixture increases by 1.0 °C. What is the heat of the reaction in the experiment?

[Specific heat capacity of solution is 4.2 J g-1 C-1; Relative atomic mass of Mg = 24]

Dalam satu eksperimen, 2.4 g serbuk magnesium ditambahkan kepada 100 cm3 larutan kuprum(II) sulfat 2.0 mol dm-3.Suhu campran meningkat sebanyak 1.0 °C.Berapakah haba tindak balas dalam eksperimen itu?

[Muatan haba tentu larutan ialah 4.2 J g-1 C-1; Jisim atom relatif bagi Mg = 24]

A – 0.42 kJ mol-1

B – 0.48 kJ mol-1

C – 4.20 kJ mol-1

D – 4.80 kJ mol-1

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