kimia f4 akhir tahun sbp 2008

4541/1 SULIT1

SULIT 4541/14541/1KIMIAKertas 1Oktober20081¼ hrs

BAHAGIAN PENGURUSANSEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER

SEKTOR OPERASI PENDIDIKANKEMENTERIAN PELAJARAN MALAYSIA

______________________________________________

PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN 4 2008

KIMIA

Kertas 1

Satu jam lima belas minit

JANGAN BUKA KERTAS SOALAN INI HINGGA DIBERITAHU

1. Kertas soalan ini mengandungi 50 soalan.2. Jawab semua soalan3. Jawab dengan menghitamkan ruangan yang betul pada kertas jawapan4. Bagi setiap soalan hitamkan satu ruangan sahaja5. Sekiranya anda hendak menukar jawapan, padamkan tanda yang telah dibuat.

Kemudian hitamkan jawapan yang baru.6. Rajah yang mengiringi soalan tidak dilukiskan mengikut skala.7. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh

diprogramkan.

Kertas soalan ini mengandungi 20 halaman bercetak

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

4541/1 SULIT2

1 Which of the following substances contain molecules?

A Zinc

B Ethanol

C Sodium chloride

D Magnesium oxide

2 Which of the following is the correct formula for barium hydroxide?

A BaOH

B Ba2OH

C Ba(OH)2

D BaOH2

3 Which of the following set of elements consist of all non metals?

A Chlorine, Nitrogen and Sulphur

B Oxygen, Hydrogen and Lithium

C Phosphorus, Lead and Carbon

D Carbon, Iodine and calcium

4 Which of the following compounds have electrostatic forces between the particles?

A Ammonia

B Naphthalene

C Iodine

D Potassium oxide

MOZ@C


4541/1 SULIT3

5 Which of the following is the energy change that occurs in the process of electrolysis?

A electrical energy heat energy

B potential energy chemical energy

C electrical energy chemical energy

D chemical energy electrical energy

6 The properties of acids are due to the presence of

A hydrogen ion

B hydroxide ions

C hydrogen atoms

D hydrogen molecules

7 Which of the following statements is correct?

A All carbonate salts are soluble in water

B All chloride salts are soluble in water

C All nitrate salts are soluble in water

D All sulphate salts are soluble in water

8 The National Monument is made of bronze. Which is the main metal in bronze?

A Aluminium

B Iron

C Tin

D Copper

MOZ@C


4541/1 SULIT4

9 An enclosed cylinder is filled with helium atoms. Which diagram shows the arrangement

of the helium atoms ?

10 The formula of a substance is written as FeSO4. What is the name of the compound

according to the IUPAC system?

A Iron sulphate

B Iron(II) sulphate

C Iron(III) sulphate

D Iron(II) sulphite

11 The element which does not form compound with other elements is likely to have proton

number of

A 4

B 8

C 10

D 16

MOZ@C


4541/1 SULIT5

12 Which of the following represents the electron arrangement for sodium chloride, NaCl?

[Proton number; Na, 11; Cl, 17]

13 Electrolytes are able to conduct electricity because they

A have low melting point and boiling point

B contain freely moving ions

C contain freely moving electron

D contain freely moving molecules

14 Which of the following statement describes the property of hydrochloric acid?

A It reacts with any metal to give hydrogen

B It liberates ammonia from ammonium salts

C It causes colour of litmus paper to change from red to blue

D It reacts with any bases to produce a salt.

MOZ@C


4541/1 SULIT6

15 Insoluble salts can be prepared through

A Precipitation Reaction

B Neutralization Reaction

C Crystallization

D Recrystallization

16 Haber Process can be represented by the following equation:

N2 (g) + H2 (g) → 2NH3 (g)

What is the catalyst, temperature and pressure used in this process?

Catalyst Temperature(˚C) Pressure (atm)

A Iron 450 200

B Platinum 900 150

C Platinum 800 10

D Iron 200 1050

17 The atoms 31

15

P and 32

16

S have the same

A number of protons

B number of neutrons

C number of electrons

D nucleon number

18 The ion of a newly discovered metal M has the symbol M3+ . What will be the formula of

its chloride?

A MCl

B M2Cl3

C MCl3

D M3Cl

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4541/1 SULIT7

19 The property of an element which cannot be predicted from the position of an element in

the Periodic Table of Elements is

A the charge of its ion.

B the formula of its oxide

C the number of isotopes it has.

D the acidic or basic nature of its oxide.

20 Table 1 shows the proton number of elements M and N.

Element Proton number

M 3

N 17

TABLE 1

Which of the following is true of the compound formed between elements M and N?

Compound formula Type of bond

A MN Ionic bond

B MN Covalent bond

C M2N3 Ionic bond

D M3N2 Covalent bond

21 Which of the following voltaic cells produces the highest voltage?

A Iron - copper cell

B Zinc - copper cell

C Aluminium - zinc cell

D Magnesium - copper cell

MOZ@C


4541/1 SULIT8

22 Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)

Based on the equation above we can conclude that

[Relative atomic mass: Zn, 65; H,1; O,16; S, 32]

I 1 mol of sulphuric acid will produce 1 mol of zinc sulphate

II 1 mol of zinc will react with 1 mol of sulphuric acid

III 100 cm3 sulphuric acid 1 mol dm-3 will produce 16.1 g zinc sulphate if the zinc

used is in excess.

IV The total volume of hydrogen gas liberated will be determined by the amount of

zinc and sulphuric acid reacted.

A II and IV only

B I, II and III only

C I, III and IV only

D I, II, III and IV

23 Which of the following ions would liberate a gas that turns damp red litmus paper blue

when added with sodium hydroxide solution and then heated?

A H+

B NH4+

C Zn2+

D Fe2+

MOZ@C


4541/1 SULIT9

24 Table 2 shows the pairs of polymer and monomer.

TABLE 2

Which of the following pairs of polymer and monomer are correct ?

A I and II only

B I, II and III only

C II, III and IV only

D I, II, III and IV

25 Which of the following diagram represents magnesium oxide?

Polymer Monomer

I Carbohydrate Glucose

II Polyvinyl chloride Chloroethene

III Protein Amino acid

IV Natural rubber Neoprene

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4541/1 SULIT10

26 How many molecules of bromine are there in 0.045 mol of bromine?

[Avogadro Constant ; 6.02 X 1023 ]

A 2.7 X 1022

B 3.3 X 1023

C 7.9 X 1024

D 1.2 X 1025

27 An element X requires two electrons to form a stable negative ion. Which group is X

located in the Periodic Table of Elements?

A 2

B 16

C 17

D 18

28 The electron arrangement of atoms P and Q are 2.8.4 and 2.6 respectively.

Which of the following statement is true about the formation of a compound between P

and Q ?

A Each atom Q receives an electron from one atom P

B Each atom P receives four electrons from one atom Q

C Each atom P combines with two atoms Q by sharing of electrons

D Each atom P combines with one atom Q by transfer of electrons

MOZ@C


4541/1 SULIT11

29 Silver nitrate solution of 1 mol dm-3 is electrolysed by using silver electrodes. Which of the

following half equations occur at the anode and cathode respectively?

Anode Cathode

A 4OH- O2 + 2H2O+ 4e 2H+ + 2e H2

B 4OH- O2 + 2H2O+ 4e Ag+ + e Ag

C Ag Ag+ + e Ag+ + e Ag

D Ag Ag+ + e 2H+ + 2e H2

30 Sulphuric acid is a diprotic acid because

A sulphuric acid has the properties of acid and also a dehydrating agent.

B one mole of sulphuric acid can neutralise two moles of bases.

C one molecule of sulphuric acid contains two moles OH- ions.

D one molecule of sulphuric acid produces two H+ ions in water.

31 The following equation represents the reaction between copper(II) oxide and nitric acid.

CuO + 2HNO3 → Cu(NO3)2 + H2O

Calculate the mass of copper(II) nitrate formed when 6.4g of copper (II) oxide powder

reacts with excess nitric acid.

[ Relative atomic mass: Cu,64; N,14; O,16]

A 4.96g

B 5.04g

C 7.52g

D 15.04g

MOZ@C


4541/1 12

32 Diagram 1 below shows the atom arrangement in brass that is represented by atom P and

atom Q.

DIAGRAM 1

Which of the following represents metals P an

33 An element represented by the symbol3

7X

A has three valence electrons

B forms a positively charged ion.

C is located in Group 17 of the Periodic Table

D has 3 protons and 7 neutrons.

34 8 atoms of element Z have the same mass as in

Based on the statement above, what is the relative

[Relative atomic mass : Te, 128 ]

A 8

B 16

C 32

D 64

P Q

A Copper Zinc

B Tin Copper

C Zinc Carbon

D Zinc Copper

MOZ@C

SMS MUZAFFAR SYAH
SULIT
Atom Q

d Q?

.

1 atom of tellurium, Te.

atomic mass of element Z?

Atom P

, MELAKA

4541/1 SULIT13

35. Which of the following locations are correct of an element with a proton number of 7 in

the Periodic Table of Elements?

I Period 2

II Period 5

III Group 15

IV Group 2

A I and III only

B II and IV only

C I and IV only

D II and III only

36 Diagram 2 shows the electron arrangement in a molecule formed between two Z atoms.

DIAGRAM 2

Which of the following statements is true about molecule Z2?

A Exists as solid at room temperature.

B Conducts electricity in molten state.

C Has a low melting point.

D Dissolves in water.

Z Z

MOZ@C


4541/1 SULIT14

37 Substance X in the molten form is electrolysed using carbon electrodes. After 10 minutes,

a brown solid is deposited at the cathode and a greenish yellow gas is released at the

anode. What is substance X?

A Lead (II) chloride

B Lead (II) bromide

C Copper (II) bromide

D Copper (II) chloride

38 Which of the following solutions has the lowest pH value?

A 0.1 mol dm-3 sulphuric acid, H2SO4

B 0.1 mol dm-3 ethanoic acid, CH3COOH

C 1.0 mol dm-3 aqueous ammonia, NH4OH

D 1.0 mol dm-3 sodium hydroxide solution, NaOH

39 Zn + 2HCl → ZnCl2 + H2

Based on the equation above, calculate the volume of hydrogen gas released at room

conditions when 1.3 g of zinc powder reacts with excess hydrochloric acid.

[ Molar volume : 24 dm3mol-1 at room conditions, Relative atomic mass: H,1; Cl, 35.5;

Zn, 65]

A 120 cm3

B 240 cm3

C 360 cm3

D 480 cm3

MOZ@C


4541/1 SULIT15

40 The manufacturing of sulphuric acid involves several reactions. Which of the following

equations represents the reaction that requires the use of vanadium(V)oxide as catalyst?

A S + O2 → SO2

B 2SO2 + O2 → 2SO3

C SO3 + H2SO4 → H2S2O7

D H2S2O7 + H2O → 2H2SO4

41 Which of the following graphs shows the temperature (T) against time (t) when a mixture

of pentane (boiling point 36oC) and hexane (boiling point 70oC) is distilled?

42 A hydrocarbon has the empirical formula of CH3 with a molar mass of 30 g mol-1. Which

of the following is the molecular formula of the hydrocarbon?

[Relative atomic mass : H, 1; C,12 ]

A CH3

B C2H6

C C3H9

D C4H12

MOZ@C


4541/1 SULIT16

43 Element X reacts with cold water to form alkaline solution while element Y reacts with

water to form acidic solution. Which of the following is the correct group of X and Y in

the Periodic Table of Elements?

X Y

A 1 14

B 2 15

C 1 17

D 3 17

44 Table 3 shows the proton number of three elements X, Y and Z.

Element X Y Z

Proton Number 12 8 17

TABLE 3

What is the formula of the substance and the type of bond formed between X, Y and Z?

Formula Type of Bond

I

II

III

IV

XY

YZ2

XZ2

Z2

Covalent

Covalent

Ionic

Covalent

A IV only

B III and IV only

C II, III and IV only

D I, II, III and IV

MOZ@C


4541/1 SULIT17

45 Diagram 3 shows the set up of the apparatus of a simple voltaic cell. The reading on

the voltmeter is 0.3 V.

DIAGRAM 3

Which of the following statements will increase the reading of the voltmeter?

I Increase the volume of iron (II) sulphate solution

II Substitute the iron plate with a silver plate

III Use a more dilute iron (II) sulphate solution

IV Substitute the zinc plate with a magnesium plate

A I and II only

B I and III only

C II and IV only

D II, III and IV only

Iron (II) sulphatesolution

Iron plate

Zinc plate

MOZ@C


4541/1 SULIT18

46 Neutralization reaction between nitric acid and calcium hydroxide is shown in the

chemical equation below.

2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O

What is the minimum volume of nitric acid of 0.2 mol dm-3 needed to completely

neutralise 50 cm3 calcium hydroxide solution 0.05 mol dm-3.

A 12.5 cm3

B 25.0 cm3

C 37.5 cm3

D 50.0 cm3

47 When sodium hydroxide is added dropwise until in excess to a solution, a white

precipitate which is soluble in excess is formed. The ions that could be present in the

solution are

I Al3+

II Zn2+

III Mg2+

IV Pb2+

A I and II only

B III and IV only

C I, II, and IV only

D I, II, III and IV

MOZ@C


4541/1 SULIT19

48 Which of the following properties of ceramics are correctly matched to the ceramic

articles?

Ceramic articles Properties of ceramic

I Tiles Resistant to chemical reactions

II Spark plug High melting point

III Superconductor Low electrical resistance

IV Electrical cable holder Good conductor of electricity

A I and II only

B II and III only

C I, II and III only

D II, III and IV only

49 Elements P, Q and R are in the same group in the Periodic Table of Elements. Table 4

shows the observation for the reaction of the elements with chlorine and the formula of the

chloride formed.

Reaction with chlorine Formula of chloride

P Burns brightly PCl

Q Burns very brightly QCl

R Burns most brightly RCl

TABLE 4

Which of the following statements is correct?

A P, Q, R are earth metals

B The atomic radius increases from P to Q to R

C The elements form ion with univalent negative charge

D Their reactivity decreases down the group

MOZ@C


4541/1

50 Diagram 4 below shows the set up of the apparatus for the electrolysis of concentrated

sodium chloride solution.

Which of the followi

cathode respectively?

Anode

A O2

B Cl2

C Cl2

D O2

MOZ@C

SULIT20

DIAGRAM 4

ng formulas shows the products formed at the anode and the

Cathode

H2

H2

Na

Cl2

END OF QUESTION PAPER


Nama: .................................................... Tingkatan: ..............................SULIT4541/2KimiaKertas 2Oktober20082 ½ jam

BAHAGIAN PENGURUSANSEKOLAH BERASRAMA PENUH / KLUSTER



KIMIA

Kertas 2

Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Tuliskan nama dan tingkatan padaruang yang disediakan.

2. Jawab semua soalan daripadaBahagian A. Tuliskan jawapan andadalam ruang yang disediakan

3. Jawab satu soalan daripada BahagianB dan satu soalan daripada BahagianC.Jawapan kepada bahagian B danBahagian C hendaklah ditulis padakertas tulis.

4. Anda diminta menjawab dengan lebihterperinci untuk Bahagian B danBahagian C. Jawapan mestilah jelasdan logik. Persamaan, gambar rajah,jadual, graf dan cara lain yang sesuaiuntuk menjelaskan jawapan anda bolehdigunakan.

5. Anda hendaklah menyerahkan kertastulis dan kertas tambahan, jikadigunakan bersama-sama dengankertas soalan.

6. Penggunaan kalkulator saintifik yangtidak boleh diprogramkan adalahdibenarkan.

Bahagian Soalan Markahpenuh

Markahdiperoleh

A

1 102 103 104 105 106 10

B 7 208 20

C9 2010 20

Jumlah

Kertas soalan ini mengandungi 16 halaman bercetak[lihat sebelah

SULIT

MOZ@C


SULIT 4541/2

4541/2

1. Diagram 1.1 shows the symbols for atoms of elements X, Y and Z.

(a) (i) W

…

(ii) W

…

(iii)

…

(b) Diagliqui

(i) Stat

………

(ii) Na

……

28

Y19

Z

MOZ@C

24

X

[Lihat sebelah]SULIT

2

DIAGRAM 1.1

rite the electron arrangement of atom Z.

……………………………………………………………………………………………[1 mark]

hat is the number of neutrons for atom Y?

……………………………………………………………………………………………[1 mark]

What is the atomic mass of atom X?

……………………………………………………………………………………………[1 mark]

ram 1.2 shows the set up of the apparatus of an experiment where a drop of bromined is dropped into a gas jar and is left for a few minutes.

DIAGRAM 1.2

e one observation in the gas jar after a few minutes.

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

me the process that occurred in the gas jar.

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

12 14 9

bromine

gas


SULIT 4541/2

4541/2 [Lihat sebelah]SULIT

3

(iii) Name the type of particles that exist in bromine.

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

(iv) State the change of state of bromine that occurred in the gas jar.

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

(v) The change of state in (b) (iv) can occur at room temperature. Explain why

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

(c) Substance X has a melting point of 79oC . Draw the particles arrangement of substance X at60oC and at 80oC.

At 60oC At 80oC[2 marks]

MOZ@C


SULIT 4541/2


4

2. An experiment was carried out in the school laboratory to determine the empirical formula of anoxide of copper by flowing hydrogen gas over heated copper oxide. Table 2 shows the resultsobtained.

Description Mass (g)

Combustion tube + asbestos paper 36.20

Combustion tube + asbestos paper + copper oxide 39.40

Combustion tube + asbestos paper + copper 38.76

TABLE 2

(a) What is meant by ‘empirical formula’ ?

………………………………………………………………………………………………

………………………………………………………………………………………………[1 mark]

(b) Draw a labelled diagram to show the set up of the apparatus that can be used to carry outthe experiment above.

[2 marks]

(c) State one precautionary step to be taken when carrying out the experiment above.

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

MOZ@C


SULIT 4541/2


5

(d) Based on the results obtained,

(i) calculate the mass of copper and oxygen that have reacted.

[1 mark]

(ii) determine the ratio of moles of copper atom to oxygen atom.[Relative atomic mass: Cu, 64; O, 16]

[1 mark]

(iii) determine the empirical formula of the copper oxide

[1 mark]

(e) Write a balanced chemical equation for the reaction between copper oxide and hydrogen.

………………………………………………………………………………………………[1 mark]

(f) Can the empirical formula of magnesium oxide be determined through the experimentabove? Give one reason for your answer.

………………………………………………………………………………………………

………………………………………………………………………………………………[2 marks]

MOZ@C


SULIT 4541/2


6

3. Diagram 3 shows the position of several elements in the Periodic Table of Elements.The letters do not represent the actual symbols of the elements.

P U V

Q T

R S W

DIAGRAM 3

(a) Using the letters in Diagram 3, answer the following questions.

(i) Choose an element that is monoatomic.

……………………………………………………………………………………[1 mark]

(ii) Which element forms an amphoteric oxide?

……………………………………………………………………………………[1 mark]

(iii) Which element is a halogen?

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

(b) Write the formula for the ion formed from an atom of element P.

………………………………………………………………………………………………[1 mark]

(c) Which element has the biggest atomic radius?

………………………………………………………………………………………………[1 mark]

(d) (i) Why are elements Q and R placed in the same group?

………………………………………………………………………………………………[1 mark]

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SULIT 4541/2


7

(ii) When a small piece of element Q is put into water, a type of solution is formed.

Name the type of solution formed.

………………………………………………………………………………………………[1 mark]

(iii) Compare the reactivity of the reaction towards water between elements Q and R.

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

(e) Arrange P, U, V and T according to the increase in size of atoms.

………………………………………………………………………………………………[1 mark]

(f) State one special characteristic of element S.

………………………………………………………………………………………………[1 mark]

MOZ@C


SULIT 4541/2

4541/2

4. Diagram 4 shows the set up of the apparatus for the electrolysis of copper(II) sulphate solutionusing copper as electrodes.

(a)

(b

(c)

(d

MOZ@C

State wh

…………

) Name al

…………

(i) S

………..

(ii) W

………..

) (i) S

……….…

T
U

8

DIAGRAM 4

ich electrode acts as the anode.

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

l the ions present in the solution.

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

tate the observation at electrode T .

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

rite the half equation for the reaction at electrode T.

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

tate the colour change (if any) to the copper (II) sulphate solution.

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

copper(II) sulphatesolution


SULIT 4541/2


9

(ii) Explain your answer in (d)(i)

……….……………………………………………………………………………………

………..……………………………………………………………………………………

…………………………………………………………………………………………….[2 marks]

(f) The above experiment is repeated by using carbon electrodes to replace the copperelectrodes.

(i) Name the product formed at electrode U.

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

(ii) Describe how you could verify the product formed in f(i)

…….………………………………………………………………………………………..

…….………………………………………………………………………………………..

…….………………………………………………………………………………………..[2 marks]

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SULIT 4541/2

4541/2

5. Diagram 5 shows the set up of the apparatus and the magnification of the burette reading for thetitration of 25.0 cm3 of potassium hydroxide solution and 1.0 mol dm-3 of hydrochloric acidusing phenolphtalein as indicator.

Initial titration

(a) Complete the tab

Final burrett re

Initial burrette

Volume of acid

(b) State the change

…………………

(c) Write the chemic

…………………

(d) Calculate the con

MOZ@C

0 25

10

Final titration

DIAGRAM 5

le below.

ading/cm3

reading/cm3

/cm3

of colour to the phenolphtalein indicator in

……………………………………………

al equation for the neutralisation reaction.

……………………………………………

centration of the potassium hydroxide solut

1

solution

SMS MUZAFFAR SYAH , MELAK

26

Potassiumhydroxide


[2 marks]

the titration.

…………………………………[1 mark]

…………………………………[1 mark]

ion in mol dm-3.

A

SULIT 4541/2


11

[3 marks](e) The experiment above is repeated by using 1.0 mol dm-3 of sulphuric acid to replace the

hydrochloric acid to titrate the 25.0 cm3 potasssium hydroxide solution.

(i) State the volume of the sulphuric acid needed to titrate the potassium hydroxide solution.

……………………………………………………………………………………………………[1 mark]

(ii) Explain your answer in (e) (i).

…………………………………………………………………………………………………..

…………………………………………………………………………………………………..

…………………………………………………………………………………………………..[2 marks]

6. Diagram 6 shows the flow chart for the industrial manufacture of sulphuric acid.

+ O2 + O2

Heat Step X

Step Y + H2SO4

DIAGRAM 6

(i) Name the process of manufacturing sulphuric acid.

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

(ii) Write a balanced chemical equation for Step X and Step Y.

Step X: …………………………………………………………………………………………

Step Y: …………………………………………………………………………………………

[2 marks]

Sulphur Sulphur dioxide Sulphur trioxide

OleumSulphuric acid

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SULIT 4541/2


12

(iii) State the three conditions required for the reaction in Step X.

……………………………………………………………………………………………….

……………………………………………………………………………………………….

……………………………………………………………………………………………….[3 marks]

(b) Sulphuric acid reacts with aqueous ammonia to form ammonium sulphate, (NH4)2SO4 salt.

(i) Name the reaction.

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

(ii) State one use of ammonium sulphate in daily life?

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

(iii) Calculate the percentage of nitrogen in ammonium sulphate.[Relative atomic mass : H, 1; O, 16; N, 14; S, 32 ]

[2 marks]

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SULIT 4541/2


13

Section B ( 20 marks )Answer any one question from this section.

The suggested time to answer section B is 30 minutes.

7. Diagram 7 shows the formulae of 4 types of gases released during the eruption of a volcano.

N2 CO2 H2S H2O

DIAGRAM 7

(a) Calculate the molar mass of each gas shown in Diagram 7.[Relative atomic mass : H, 1; C, 12; O, 16; N, 14; S, 32 ]

[4 marks]

(b) Show that 0.9 g of water vapour contains the same number of molecules as in 2.2 g ofcarbon dioxide.[Relative atomic mass: H, 1; C, 12; O, 16; Avogadro Constant, NA = 6.02 X 1023]

[4 marks]

(c) A sample contains 0.1 mol carbon dioxide gas at room temperature and pressure.[Relative atomic mass : C, 12; O, 16; 1 mol of gas occupies a volume of 24 dm3 at roomtemperature and pressure; Avogadro Constant,NA = 6.02 X 1023]

Calculate:

(i) the volume,

(ii) the mass,

(iii) the number of molecules and

(iv) the number of atoms

of the 0.1 mol carbon dioxide gas in the sample.[5 marks]

(d) At very high temperature, hydrogen sulphide gas released from the eruption of thevolcano will react with oxygen in the air to produce sulphur dioxide and water vapour.Referring to the information above,

(i) write a balanced chemical equation to represent the reaction.

(ii) calculate the maximum mass of sulphur dioxide produced if 952 g of hydrogensulphide is released from the volcanic eruption.

[7 marks]

MOZ@C


SULIT 4541/2


14

8. Table 8.1 shows the electron arrangement for atoms P, Q dan R.

Element Electron arrangement

P 2.8.1

Q 2.8.7

R 2.4

TABLE 8.1

(a) The reaction between atoms of P and Q form an ionic compound whereas the reaction betweenatoms of Q and R forms a covalent compound. Based on the above statement, explain howthese ionic and covalent compounds are formed.

[12 marks]

(b) Table 8.2 shows the melting point and boiling point of two chemical compounds at roomtemperature.

Compound Melting Point (OC) Boiling Point (OC)

M - 23 76.8

N 2030 2970

TABLE 8.2

Explain the differences in the melting point and boiling point of compound M and N with respectto the types of particles present and the types of bonding.

[ 8 marks]

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15

Section C ( 20 marks )Answer any one question from this section.

The suggested time to answer section C is 30 minutes.

9. (a) What is the meaning of electrolyte?[2 marks]

(b)

Explain the above statement.[4 marks]

(c) A student has a spoon made of iron. He intends to beautify the spoon by electroplating itwith a suitable metal.Design a laboratory experiment to electroplate the iron spoon.

Your answer should consist of the following:

Chemicals required

Procedures of the experiment

Diagram showing the set-up of the apparatus

Half-equations involved in the reaction

Observation

[10 marks]

(d) Electrolytic cell and voltaic cell are two types of cells.

Draw one example of a voltaic cell and write the half equation for the reaction that occurs atthe anode and cathode.

[4 marks]

Lead(II) bromide powder cannot conduct electricitybut molten lead(II) bromide can conduct electricity.

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4541/2 16

10. (a) Describe an experiment to prepare a dry zinc nitrate.Your answers should include the equations involved.

[10 marks ]

(b) Diagram 10 shows the arrangement of atoms in pure copper and brass.

DIAGRAM 1

(i) What is the meaning of alloy?

(ii) State the three aims of alloying

(iii) Brass is harder than pure copper. Expla

pure copper

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SMS MUZAFFAR S


0

[1 mark]

[3 marks]in.

[6 marks]

brass

YAH , MELAKA

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17

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Name :………………………………………………………… Class: ………….………



_______________________________________________


KIMIA

KERTAS 3

Satu jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Tuliskan nama dan tingkatan anda padaruangan yang disediakan.

2. Kertas soalan ini adalah dalamdwibahasa.

3. Soalan dalam Bahasa Inggerismendahului soalan yang sepadan dalamBahasa Melayu.

4. Calon dikehendaki membaca maklumatdi halaman 2 kertas soalan ini.

S

J

Kertas soalan ini mengandungi 10 halam

4541/3KIMIAKertas 3Oktober20081½ Jam

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SMS MUZAFFAR SYAH , MEL

Untuk Kegunaan Pemeriksa

oalan MarkahPenuh

MarkahDiperoleh

1 15

2 18

3 17

umlah 50

an bercetak

AKA

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4541/3 SULIT2

INFORMATION FOR CANDIDATESMAKLUMAT UNTUK CALON

1. This question paper consists of three questions. Answer all questions.Kertas soalan ini mengandungi tiga soalan. Jawab semua soalan.

2. Write your answers for Question 1 and Question 2 in the spaces provided in thequestion paper.Tuliskan jawapan bagi Soalan 1 dan Soalan 2 dalam ruang yang disediakandalam kertas soalan.

3. Write your answers for Question 3 on the lined pages at the end of the questionpaper in detail. You may use equations, diagrams, tables, graphs and any othersuitable methods to explain your answer.Tuliskan jawapan bagi Soalan 3 pada halaman bergaris di bahagian akhir kertassoalan ini dengan terperinci. Anda boleh menggunakan persamaan, gambarrajah, 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 you have done.Then write down the new answer.Sekiranya anda hendak menukar jawapan, batalkan jawapan yang telah dibuat.Kemudian tulis jawapan yang baru.

6. Diagrams in the questions are not drawn to scale unless stated.Rajah yang mengiringi soalan tidak dilukis mengikut skala kecuali dinyatakansebaliknya.

7. Marks allocated for each question or part questions are shown in brackets.Markah yang diperuntukkan bagi setiap soalan atau ceraian soalan ditunjukkandalam kurungan.

8. Time suggested for answering Question 1 and Question 2 is 45 minutes andQuestion 3 is 45 minutes.Masa yang dicadangkan untuk menjawab Soalan 1 dan Soalan 2 ialah 45 minitdan Soalan 3 ialah 45 minit.

9. You may use a non-programmable scientific calculator.Anda dibenarkan menggunakan kalkulator saintifik yang tidak bolehdiprogramkan.

10. Hand in this question paper at the end of the examination.Serahkan semua kertas jawapan anda di akhir peperiksaan.

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Marks awarded:

Mark Description

3 Excellent: The best response

2 Satisfactory : An average answer

1 Weak : An inaccurate response

0 No response or wrong response

Pemberian Markah:

Skor Penerangan

3 Cemerlang: Respons yang paling baik

2 Memuaskan: Respons yang sederhana

1 Lemah: Respons yang kurang tepat

0 Tiada respons atau respons salah

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4541/3 4

Answer all questions

1. An experiment was carried out by a group of students to determine the melting pointof acetamide. Diagram 1 shows the thermometer reading at the 4th and the 6th minuteof the experiment when acetamide was heated in a boiling tube until above itsmelting point.

DIAGRAM 1

(a)

TABLE 1

Table 1 shows the results of the experiment. Based ontable to show the temperature at the 4th and the 6th minu

(b) On the graph paper provided, draw the graph of temperaon the collected data.

Time /min0 ½ 1 1 ½ 2

Temperature/o C27.0 36.0 50.0 66.0 82.0

Time /min4 4½ 5 5½ 6

Temperature/o C84.0 88.0 92.0

100

90

80

Thermometer reading atthe 4th minute

100

1(b)

Forexaminer’suse

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Thermometer reading atthe 6th minute

Diagte.

ture a

8

90

80

ram 1, complete the

2 ½ 3 3 ½

2.0 82.0 82.0

1(a)

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[3 marks]

gainst time based

[3 marks]

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(c) Use the graph in (b) , to determine the melting point of acetamide. Show on thegraph how you determine this melting point.

………………………………………………………………………………

[3 marks]

(d) The temperature did not change from the 2nd minute until the 4th minute.Explain why.

…………………………………………………………………………………

…………………………………………………………………………………

…………………………………………………………………………………

[3 marks]

(e) Acetamide is an example of a covalent compound and sodium chloride is an example ofan ionic compound. Classify the following compounds into covalent compounds andionic compounds.

[3 marks]

Magnesium chloride Carbon dioxideTetrachloromethane MethylbenzeneZinc sulphate Copper(II) nitrate

1(c)

1(d)

Forexaminer’suse

1(e)

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2. The reactivity of alkali metals with water depends on their position in Group 1 of thePeriodic Table of the Elements. Diagram 2 below shows the set up of the apparatusfor an experiment to determine the reactivity of the alkali metals with water.

DIAGRAM 2

The experiment is carried out by using lithium, sodium and potassium to react withwater respectively. Observation of the experiment is shown in Table 2.1 below.

ALKALI METAL OBSERVATION

LithiumThe lithium metal moves slowly on the surface of thewater.

SodiumThe sodium metals moves faster on the surface of thewater with “hissing” sound.

PotassiumThe potassium metal moves the fastest on the surfaceof the water.

TABLE 2.1

alkali metal

basin filled withwater

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(a) Complete Table 2.2 below based on the experiment.

Name of variables Action to be taken(i) Manipulated variable

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

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

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

(i) The way to manipulate variable........................................................

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

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

(ii) Responding variable............................................................

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

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

(ii) What to observe in theresponding variable

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

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

(iii) Fixed variable.............................................................

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

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

(iii) The way to maintain the fixedvariable

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

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

[6 marks]TABLE 2.2

(b) State the hypothesis for the experiment above.

……………………………………………………………………………………..

……………………………………………………………………………………..[3 marks]

(c) Based on Table 2.2, arrange the alkali metals in descending order of reactivityof the metals with water.

………………………………………………………………………………[3 marks]

2(a)

2(b)

2(c)

Forexaminer’suse

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(d) The proton number of the alkali metals increase in the order:

Lithium → Sodium → Potassium

State the relationship between the position of the alkali metals in Group 1and their reactivity.

…………………………………………………………………………..................

……………………………………………………………………………………..

……………………………………………………………………………………..[3 marks]

(e) Rubidium is an alkali metal located below potassium in Group 1 . Predict thereactivity of rubidium with water.

………………………………………………………………………………[3 marks]

2(d)

2(e)

Forexaminer’suse

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3.

Based oelectrochvalues.

Your pla

(i) S

(ii) A

(iii) H

(iv) L

(v) P

(vi) T

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The distance of pairs of metals in the electrochemicalseries influenced the voltage values in different

SULIT10

n the statement above, plan a laboratory experiment to construct anemical cell to determine the factor that influences the differences in the voltage

nning should include the following:

tatement of the problem

ll the variables

ypothesis

ist of materials and apparatus

rocedure

abulation of data

[17 marks]

END OF QUESTION PAPER

electrochemical cells.


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1

SULIT 4541/1/2/34541/1KimiaOktober2008



PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN EMPAT 2008 SBP

KIMIAPeraturan pemarkahan Kertas 1, 2 dan 3

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Paper 1

1 B 21 D 41 B2 C 22 D 42 B3 A 23 B 43 C4 D 24 B 44 C5 C 25 C 45 C6 A 26 A 46 B7 C 27 B 47 C8 D 28 C 48 C9 D 29 C 49 B

10 B 30 D 50 B11 C 31 D12 D 32 A13 B 33 B14 D 34 B15 A 35 A16 A 36 C17 B 37 D18 C 38 A19 C 39 D20 A 40 B

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Marking Scheme Paper 2Section A

No MARKING CRITERIA MARK

SUB TOTAL1(a)(i)

(ii)(iii)

2.71424

111 3

1(b)(i)(ii)(iii)(iv)(v)

Reddish brown gas formedDiffusionMoleculesLiquid → gasBromine has low boiling point

11111 5

1(c)

1

1 2

10

2(a) A chemical formula that gives the simplest whole number ratioof atoms of each element in the compound.

1 1

2(b)

Burning excess hydrogen

- functional

- label( oxide of copper, dry hydrogen gas and heat)

1

1 2

Dryhydrogengas

Oxide of copper

Heat

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2(c) ●Remove all the air from the apparatus before the oxide ofcopper is heated●The flow of hydrogen gas is continued throughout the cooling ofthe product

Any one answer correct 1 1

2 d(i)

2 d(ii)

2d(iii)

mass of copper : 38.76 – 36.20 = 2.56gmass of oxygen : 39.40 – 38.76 = 0.64g

Calculation + mass including unit

Cu : O2.56/64 : 0.64/160.04 : 0.04

1 : 1

CuO

1

1

1 3

2(e) CuO + H2 Cu + H2O 1 1

2(f) No.

Magnesium is more reactive than hydrogen.// Magnesium isabove hydrogen in the Reactivity Series.

1

1 2

10

3(a) WTV

111 3

3 (b) P2+ 1 1

3(c) R 1 1

3(d) ● The atoms have the same valence electron.● alkaline● R is more reactive than Q

111 3

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3(e) V, U, P and T 1 1

3(f) Forms coloured compound/ion//can act as catalyst//has variableoxidation number

1 1

10

4(a) U 1 1

4(b) copper (II) ion, suphate ion,hydrogen ion,hydroxide iona: symbol

1 1

4(c)(i)(ii)

brown solid is deposited//electrode T becomes thickerCu2+ + 2e Cu

11 2

4(d) (i)(ii)

The intensity of blue colour solution remains unchangedThe rate of Cu2+ ion discharged at the cathode same with the rateof Cu2+ ion formed at the anodeThe concentration / no.of Cu2+ ion remains unchanged

1

11 3

4(f)(i)(ii)

oxygen gasPut a glowing wooden splinter near/into the mouth of the test tubelighted up/rekindled

111 3

10

5(a)

Final burrett reading/cm3 25.55Initial burrette reading/cm3 0.55Volume of acid/cm3 25.00

11 2

5(b) pink to colourless 1 1

5(c) HCl + KOH → KCl + H2O 1 1

5(d) MaVa = 1MbVb 1

1.0 x 25.0 = 1Mb x 25.0 1

Mb = 1.0 mol dm-3

1

1

1 3

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6

5(e) 12.5 cm3

Sulphuric acid is a diprotic acid.has 2 times the concentration of H+ ions compared tohydrocholric acid.

111 3

10

6(a)(i)

(ii)(iii)

(i)

Contact Process

2SO2 + O2 → 2SO3

SO3 + H2SO4 → H2S2O7

Catalyst: vanadium (V) oxideTemperature: 450oC – 550oCPressure : 1 atm

1

11

111 6

6(b) (i)(ii)(iii)

NeutralizationFertilizer% of Nitrogen = 14X2

--------------------------- X 10014(2)+1(8)+32+16(4)

= 28----- X 10032

= 21.21%

11

1

1 4

10

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7

Section BNo MARKING CRITERIA MARK

SUB TOTAL7 (a) 1. N2 : 2 X 14 = 28

2. CO2 : 12 + 2(16) = 44

3. H2S : 2(1) + 32 = 34

4. H2O : 2(1) + 16 = 18

1

1

1

1 4

7(b) 1 moles of water vapour = 0.918

= 0.05

2 no. of molecules = 0.05 moles X 6 X 1023

= 3 x 10 22

3 moles of CO2 = 2.244

= 0.05 moles

4 no. of molecules = 0.05 moles X 6 x 1023

= 3 x 10 22

1

1

1

1 4

7(c)(i)

(ii)

(iii)

(iv)

Volume = 0.1 X 24= 2.4 dm3// 2400cm3

Mass = 0.1 X 44= 4.4g

No. of molecules = 0.1 X 6.02 X 1023

= 6.02 X 1022

No. of atom = 3 X 0.1 X 6.02 X 1022

= 1.806 X 1023

1

1

1

11 5

7d(i)

(ii)

2 H2S + 3 O2 → 2SO2 + 2H2OCorrect formula of reactant and productCorrect no. of mol of reactantCorrect no. of mol of product

1. Moles of H2S = 95234

= 28

2. 2 moles of H2S produced 2 moles SO2

28 moles of H2S produced 28 moles of SO2

3. mass of SO2 = 28 x [ 32 + 2(16) ]= 1792 g

111

1

11

1 7

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8

208(a) Between P and Q

Atom P has 1 valence electron

Atom P loses/donates/transfers 1 electrons to form P+ ion

//

PP+ + e- and attain stable octet electron arrangement

Atom Q has 7 valence electrons

Atom gains/receives/accept 1 electron to formQ- ion//

Q + e-Q-

attain the stable /octet electron arrangement

The two oppositely-charged ions// the P+ and Q- ion are

bonded together by a strong electrostatic force

To form a ionic compound with the formula PQ //

Diagramn

Between Y and Z

Atom R has 4 valence electrons and atom Q has 1 valence

electrons

One atom R contributes 4 electrons and (each) atom Q

contributes one electron for sharing

Atom R shared 4 pairs of electron with 4 atoms Q

to attain a octet /stable electron arrangement respectively

Diagram

1

1

1

1

1

1

1

1

1

1

1

1

P

Q

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9

12

8(c) Compound M is an ionic compounds

Compound N is a covalent compounds

Compound M has high melting and boiling point

Compound N has low melting and boiling point

Strong electrostatic force of attraction exists between

the ions /the oppositely-charged ions in compound M

Weak intermolecular forces //held together by weak (Van

der Waals) force of attractions between molecules in

compound N

A lot of heat energy // high of energy is required to break

the strong forces in the compound M

● little heat energy //low energy is needed to overcome the

weak forces in the compound N

1

11

1

1

1

1

18

20

R QQ

Q

Q

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Section CNo MARKING CRITERIA MARK

SUB TOTAL9(a) 1.Electrolyte is an ionic compound that can conduct electricity

2.in the molten state or aqueous solution.11 2

9(b) 1. In powdered form, lead(II) ions and Bromide ions cannot movefreely.2. The ions are held together with strong electrstatic forces3. In molten state, the ions can move freely.4. The free moving ions carry the electrical charges.

1

111 4

9(c) 1. Chemicals required: silver nitrate solution, silver plate,Procedures:2. [50 – 200]cm3 of [0.5 – 2.0] mol dm-3 of silver nitrate solutionis poured into a beaker.3. The silver plate is the anode and the iron spoon is the cathode.4. The silver plate and the iron spoon are connected to the batterywith the connecting wires.5. The silver plate and the iron spoon are then dipped into thesilver nitrate solution.6. [complete and functional set-up of apparatus]7. [labels: at anode: silver plate, at cathode: iron spoon,electrolyte: silver nitrate solution}8. Half equation at anode: Ag → Ag+ + e9. Half equation at cathode: Ag+ + e → Ag10. Observation: iron spoon is covered with grey, silvery/shinydeposit.

1

1

1111

1

111 10

9(d) 1. [one example of voltaic cell with complete and functional set-upof apparatus:2. [Labels: at anode: more electropositive metal,eg. Zinc

at cathode: less electropositve metal, eg. Copper]a suitable electrolyte, eg. Copper(II) sulphate solution]

3. Half-equation at anode: Zn → Zn2+ + 2e4. Half-equation at cathode: Cu2+ + 2e → Cu

1

111

420

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No MARKING CRITERIA MARK

SUB TOTAL10(a) 1 Name of suitable reactant e.g: zinc/zinc oxide/zinc carbonate

and nitric acid

2 [50-200] cm3 of [0.1-2.0 ]moldm-3 of nitric acid is poured into abeaker

3 Heat /Warm the acid

4 Add in zinc/zinc oxide/zinc carbonate into the acid bit by bituntil in excess/ no longer dissolves

5 Stir the mixture and filter

6 The filtrate is poured into an evaporating dish.

7 heat until saturated

8 The solution is allowed to cool

9 The crystals formed are filtered and by compressing/pressingbetween 2 sheets of filter paper.

10 Suitable chemical equations e.g ;

ZnCO3 + 2HNO3 Zn(NO3)2 + H2O + CO2

1

1

1

1

1

1

1

1

1

1 10

10b(i)

(ii)

(iii)

An alloy is a mixture of two or more elements with a certain fixedcomposition in which the major component is a metal

To increase the strength/ hardness of a pure metal Toincrease the resistance to corrosion of a pure metalTo improve the appearance of a pure metal

In pure copper,atoms are of the same sizeatoms are orderly arranged in layersthe layers of atoms can slide over each one another when a force isapplied

In brass, atoms of tin and copper have different sizethe presence of tin atoms disrupt the orderly arrangement of thecopper atoms.The layers of copper atoms are more difficult to slide over eachother.

1

111

111

1

11

1020

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Marking Scheme Paper 3

1 (a) KK0503 – Measuring and using numbers

EXPLANATION SCORE[Able to write both temperatures with correct to 1 decimal place]

temperature reading : 82.0 °Ctemperature reading : 97.0 °C

3

[Able to record all the volumes accurately but without decimal place]

temperature reading : 82temperature reading : 97

2

[Able to write at least one reading of the temperature accurately] 1No response given / wrong response 0

1 (b) KK0506 – Communicating

EXPLANATION SCORE[ Able to draw a graph of temperature against time of the experiment onthe same axes with all the 4 items below correctly ]

(i) axes labelled correctly with units(ii) suitable scale used(iii) all points plotted correctly(iv) smooth curve of graph and more than ½ size of graph paper 3

[ Able to draw a graph of temperature against time of the experiment onthe same axes with all the 3 items correctly ]

2

[ Able to manipulate two items correctly ] 1No response or wrong response 0

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1 (c)KK0505 – Predicting

EXPLANATION SCORE[Able to state the temperature correctly and able to show the how the meltingpoint is determined on the graph]Answer: 82 .0

3

[Able to state the temperature but without unit and did not label melting pointon the graph correctly]Answer: 82

2

[Able to state the temperature but without unit and did not show the meltingpoint on the graph]Answer: 82

1

No response given / wrong response 0

1 (d) KK0508 – Interpreting Data

EXPLANATION SCORE[Able to interpret the data accurately]Suggested answer:The heat energy absorbed is used to overcome the forces of attraction/bondsbetween the molecules of acetamide

3

[Able to give correct interpretation but less accurate]Suggested answer:The heat energy is used to overcome the forces of attraction of molecules /particles of acetamide

2

[Able to give an idea]Suggested answer:The heat energy is used / absorbed.

1


82oC

meltingpoint

Melting point

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1 (e) KK0505 – Classifying

EXPLANATION SCORE[Able to classify the ionic and covalent compounds correctly]

Ionic Covalent

Magnesium chlorideCopper(II) nitrate

Zinc sulphate

MethylbenzeneTetrachloromethane

Carbon dioxide

3

[Able to state at least two pairs correctly // correct grouping but wrongheading or vice versa ]

2

[Able to state one pair correctly in a correct grouping] 1


2(a) KK0510 - State the variables

EXPLANATION SCORE[Able to state the three variables and action to be taken correctly]

Name of variables Action to be taken(i) Manipulated variable:

Type of group 1 metalsused

(i) The way to manipulatevariable:

Use lithium, sodium andpotassium metal for eachexperiment.

(ii) Responding variable:

Rate of reaction//Reactivity ofthe reaction

(ii) What to observe inthe responding variable:

The movement of metal onthe water surface.

(iii) Fixed variable:

Quantity/size of metal used.

(iii) The way to maintainthe fixed variable:Use the same quantity/sizeof metal.

6

[Able to state any five items correctly] 5[Able to state any four items correctly] 4[Able to state any three items correctly] 3[Able to state any two items correctly] 2[Able to state any one item correctly] 1No response given / wrong response 0

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2 (b) KK0512 – Stating hypothesis

EXPLANATION SCORE[Able to state the relationship between manipulated variable andresponding variable correctly]Suggested answer:The metal which is below in Group 1 is more reactive in the reaction withwater//The lower the metal in Group 1 the more reactive is the reactionwith water.

3

[Able to state the relationship between manipulated variable andresponding variable but in the opposite direction]Suggested answer:The more reactive the reaction, the lower the position of the metal in Group 1

2

[Able to state an idea of the hypothesis]Suggested answer:Metals in Group 1 can react with water

1


2(c) KK 0508 – Interpreting Data

EXPLANATION SCORE[Able to arrange the metals in descending order based on their reactivity]Suggested answer:K, Na, Li

3

[Able to arrange the metals in ascending order based on their reactivity]Answer:Li, Na, K,

2

[Able to arrange the position of at least two metals in descending/ascending]Suggested answer:Na, Li, K// Li, K, Na// Na, K, Li

1


2(d) KK0507- Making relationship

EXPLANATION SCORE[Able to state the relationship accurately]Suggested answer:The lower the position of the metal in Group 1, the higher the reactivity of themetal.

3

[Able to state the relationship correctly but less accurate]Suggested answer:The reactivity of the metals is inversely proportional to their position in thegroup.

2

[Able to state an idea of a relationship]Suggested answer:Position of metals affect the reactivity

1


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c2(e) KK 0508 – Predicting

EXPLANATION SCORE[Able to predict the reactivity of rubidium correctly]Suggested answer:The reaction of Rubidium is most reactive among lithium, sodium andpotassium when react with water

3

[Able to predict the arrangement of the metals based on their reactivity]Suggested answer:The reaction of Rubidium is most reactive.

2

[Able to give an ideaSuggested answer:Rubidium is a reactive metal

1


3.(a) KK051021 – Statement of the problem

EXPLANATION SCORE[Able to make a correct statement of problem]Suggested answer:Does the distance between two/ pair of metals in the electrochemical seriesgive different voltage values?

3

[Able to make a statement of the problem or suitable aim]Suggested answer:Does the distance between two /pair of metals give different voltage values?//Distance between two/pair of metals in the electrochemical series givesdifferent voltage values.

2

[Able to state an idea of statement of problem or aim]Metals influence the voltage values

1


3 (b) KK051202 – Stating variables

EXPLANATION SCORE[Able to state all the three variables correctly]Suggested answer:Manipulated variable : types of pairs of metalsResponding variable: voltage values//potential differenceConstant variable : electrolyte used such as copper(II) sulphate solution.

3

[Able to state any two of the variables correctly] 2[Able to state one of the variables correctly or state idea regardingvariable]

1


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17

3(c) KK051202 – Stating hypothesis

EXPLANATION SCORE[Able to state the relationship between manipulated variable andresponding variable correctly]Suggested answer:The further the distance/position between two metals in the electrochemicalseries, the bigger the voltage value.[If the responding variable comes first, the score is 2]

3

[Able to state the relationship between manipulated variable andresponding variable]Suggested answer:The further the distance /position between two metals, the bigger thevoltage value//vice versa

2

[Able to state an idea of the hypothesis]Suggested answer:Metals influence the voltage value

1


3(d) KK051205 – List of materials and apparatus

EXPLANATION SCORE[Able to state the list of materialss and apparatus correctly and completely]Suggested answer:Beaker, connecting wires, crocodile clips, voltmeter, sand paper, [magnesiumribbon, zinc strip,lead strip, copper strip], [copper(II) sulphate solution]

3

[Able to state the list of substances and apparatus correctly but notcompletely]Suggested answer:Beaker, connecting wires, voltmeter, [magnesium ribbon, zinc,copper],[copper(II) sulphate solution]

2

[Able to state an idea about the list of substances and apparatus]Suggested answer:Beaker, metals, voltmeter, electrolyte, wire.

1


MOZ@C


SULIT

18

3(e) KK051204 –Procedure

EXPLANATION SCORE[Able to state a complete experimental procedure]Suggested answer:

1. [30 -200] cm3 of copper(II) sulphate solution is poured into a beaker.2. Magnesium ribbon and copper strip are cleaned with the sand paper.3. Magnesium and copper are dipped into the copper(II) sulphate solution.4. Both metals are connected to a voltmeter.5. The voltmeter reading is recorded.6. The circuit is completed.7. Steps 1 to 6 are repeated by using different of metals to pair with

copper.

3

[Able to state the procedure which include the following steps]Answer: Steps 1,3,4,5,6

2

[Able to state an idea of procedure]Answer: Steps 3,5

1


3(f) Tabulation of data

EXPLANATION SCORE[Able to exhibit the tabulation of data correctly ]

Pairs of metals Voltage/V Negative terminal

3

[Able to exhibit the tabulation of data less accurately ]

Pairs of metals Voltage

2

[Able state an idea about the tabulation of data]

Metals Voltage

1


END OF MARKING SCHEME

MOZ@C


kimia f4 akhir tahun sbp 2008

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