kimia p1 sbp mid year spm 2008

8/14/2019 Kimia P1 SBP Mid Year SPM 2008

1/44

SULIT

SULIT 4541/11

SULIT 4541/1

4541/1

Kimia

Kertas 1

Mei

20081 jam

BAHAGIAN SEKOLAH

KEMENTERIAN PELAJARAN MALAYSIA

______________________________________________

PEPERIKSAAN PERTENGAHAN TAHUN 2008

TINGKATAN 5

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 soalan

3. Jawab dengan menghitamkan ruangan yang betul pada kertas jawapan4. Bagi setiap soalan hitamkan satu ruangan sahaja

5. 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 23 halaman bercetak


2/44

SULIT

SULIT 4541/12

INFORMATION FOR CANDIDATES

1 This question paper consists of 50 questions.

2 Answer all questions.

3 Answer each question by blackening the correct space on the answer sheet.

4 Blacken only one space for each question.

5 If you wish to change your answer, erase the blackened mark that you have made. Then

blacken the space for the new answer.

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

7 You may use a non-programmable scientific calculator.


3/44

SULIT

SULIT 4541/13

1 After making observations, a chemist should try to

A collect data

B make inference

C make hypothesis

D identify problems

2 The diagram shows a model of an atom.

Who introduced this model?

A Neils Bohr

B J.J Thomson

C James Chadwick

D Ernest Rutherford

3 What is the relative molecular mass of hydrated magnesium sulphate,

MgSO4.7H2O?[Relative atomic mass: Mg, 24; S,32; O,16; H,1]

A 145

B 246

C 305

D 356

Electron

Nucleus that contains

proton and neutrons

Shell


4/44

SULIT

SULIT 4541/14

4 The table shows the properties of element Q.

Which of the following elements is Q?

A Sodium

B Helium

C Argon

D Silver

5 The table shows the electron arrangement for elements M, N, P and Q.

Element Electron arrangement

M 2.4

N 2.8.2

P 2.6

Q 2.8.7

Which of the following elements react to form an ionic compound?

A M and P

B P and QC M and Q

D P and N

6 The diagram shows the electrolysis of molten lead(II) bromide using carbon

electrodes.

What are the products at the anode and the cathode?

Anode Cathode

A Bromine Lead

B Oxygen Hydrogen

C Bromine Hydrogen

D Oxygen Lead

Element Properties

Q Non-flammable

Used as carrier gas in gas-liquid chromatography

Filled in electric light bulbs

heat

Carbon

Lead(II) bromide


5/44

SULIT

SULIT 4541/15

7 Which of the following is a weak alkali?

A Lithium hydroxide

B Aqueous ammonia

C Cooper(II) hydroxide

D Potassium hydroxide

8 Which of the following salts is prepared through precipitation process?

A Lead(II) chromate(VI)

B Ammonium chloride

C Potassium carbonate

D Barium chloride

9 The diagram shows the formation of ammonia through Haber process.

Which of the following represent catalyst X, temperature Y and pressure Z?

Catalyst X Temperature Y,oC Pressure Z / atm

A Vanadium(V) oxide 550 200

B Platinum 450 100

C Iron 200 450

D Iron 450 200

10 Which of the following is the meaning of activation energy?

A The maximum energy that the particles need to produce effective

collision

B The amount of energy used by the particles during a collision

C The amount of kinetic energy of molecules during a collision

D The minimum amount of energy that particles must have in order to

react

Hydrogen Nitrogen

Catalyst X

Temperature Y

Pressure Z

Ammonia


6/44

SULIT

SULIT 4541/16

11 Which of the following structural formulae shows an unsaturated hydrocarbon?

12 The diagram shows the atomic symbol of element X.

X

Which of the following is true about the sub-atomic particles of element X?

Proton Number Number of neutron Number of electron

A 7 7 10

B 7 7 7

C 3 4 3

D 3 4 2

A

B

C

D

7

3


7/44

SULIT

SULIT 4541/17

13 What is the number of oxygen atom in 0.1 mole of water?

[Avogadro constant: 6.02 x 1023

mol-1

]

A 6.02 x 1022

B 6.02 x 1023

C 60.2 x 1023D 3.01 x 10

23

14 X is an element that has the following properties;

Soft solid

Reacts with cold water to form alkaline solution

Store in paraffin oil

Among elements A, B, C and D in the Periodic Table of elements, which element

represent X?

15 The diagram shows the electron arrangement of a compound formed between

atoms P and Q.

Which of the following statements is true about the compound?

A There is strong intermolecular force between particles P and Q

B The compound is formed by sharing the electrons

C The compound conduct electricity in molten state

D It is an covalent compound

2-2+

QP


8/44

SULIT

SULIT 4541/18

16 The diagram shows the set-up of the apparatus used to electrolyses

0.1 mol dm-3

of copper(II) chloride solution by using carbon electrodes.

What is observed at the anode?

A Colourless gas bubbles released

B Greenish yellow gas evolvedC Brown solution produced

D Brown solid deposited

17 Which of the following equations shows the neutralization process?

I CuO + H2SO4 CuSO4 + H2O

II Zn + 2HCl ZnCl2 + H2III NH3 + HNO3 NH4NO3IV CaCO3 + H2SO4 CaSO4 + H2O + CO2

A I only

B II and IV only

C I and III only

D I, II and IV only

18 Which of the following ions form a white precipitate that does not dissolves in

excess sodium hydroxide solution but no change occur in aqueous ammonia

solution?

A Mg2+

B Pb2+

C Ca2+

D Al3+

Copper(II) chloride

solution

Carbon


9/44

SULIT

SULIT 4541/19

19 The diagram shows the lead crystal glass.

What are the major components used in the making of lead crystal glass?

A Copper(II) oxide and lead(II) oxideB Aluminium silicate and silicon dioxide

C Silicon dioxide and lead(II) oxide

D Iron(III) oxide and boron oxide

20 Chemical equation shows the reaction between zinc and sulphuric acid.

Which of the following factors increases the rate of reaction?

A Increases of volume of sulphuric acid

B Use of lower concentration of sulphuric acid

C Addition of small amount of copper(II) sulphate

D Use bigger size of zinc

21 The diagram shows the cooking gas cylinder.

Which of the following gasses is filled in the gas cylinder?

A Methane

B Ethene

C PropeneD Butane

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


10/44

SULIT

SULIT 4541/110

22 The graph shows the cooling curve of acetamide.

Which of the following statements are true about the particles in acetamide from S

to V?

I Heat energy is released by particles

II The kinetic energy of the particles increase

III The particle are closer to one another

IV The movement of the particles becomes slower

A I and III only

B III and IV only

C II, III and IV only

D I, III and IV only

23 The chemical equation shows the burning process of ethene in excess air.

What is the maximum volume of carbon dioxide gas evolved when 0.5 mole of

ethene burns completely?

[1 mole of gas occupied 24 dm3

at room temperature and pressure]

A 12 dm3

B 24 dm3

C 36 dm3

D 48 dm3

Temperature/oC

V

UT

S

Time/ s

C2H4(g) + 3O2 2CO2(g) + 2H2O(l)


11/44

SULIT

SULIT 4541/111

24 The diagram shows the structure of atoms Q and R.

Which of the following is true about atoms Q and R?

A Q exists as a diatomic molecule

B Q and R have the same chemical properties

C R reacts with Q to form an ionic compound

D Q reacts with water to release hydrogen

25 The electron arrangement of atom J is 2.6 and atom G has 4 valence electrons.

What type of bond and the chemical formula of the compound formed between

atoms J and G?

Type of bond Chemical formula

A Ion JG2B Ion GJ2C Covalent GJ2D Covalent JG2

26 The diagram shows the set-up of apparatus for the electrolysis of silver nitrate

solution.

What is formed at the cathode?

A Silver atoms

B Oxygen gas

C Hydrogen gas

D Silver ions

Atom RAtom Q

Silver

Silver nitrate solution

Silver


12/44

SULIT

SULIT 4541/112

27 The distilled water is added to 20 cm3

of 1.0 mol dm-3

sodium hydroxide solution

to produce 250 cm3

of sodium hydroxide solution.

What is the concentration of the sodium hydroxide solution produced?

A 0.02 mol dm-3

B 0.04 mol dm-3

C 0.06 mol dm-3

D 0.08 mol dm-3

28 Ammonium sulphate is used as a chemical fertilizer. This fertilizer can be

prepared in the laboratory through the reaction between

A aqueous of ammonia solution and dilute sulphuric acid

B aqueous of ammonia solution and sulphur dioxide

C ammonia gas and sulphur and oxygen

D ammonia gas and sulphur trioxide

29 The diagram shows the arrangement of atoms in steel.

What is X?

A Tin

B Zinc

C Carbon

D Copper

Iron atom

X atom


13/44

SULIT

SULIT 4541/113

30 The graph shows the maximum volume of carbon dioxide gas evolved when

calcium carbonate react with hydrochloric acid.

What is the rate of reaction at 120 s?

A 0.00 cm3

s-1

B 0.15 cm3

s-1

C 0.29 cm3

s-1

D 0.35 cm3

s-1

31

What could be the organic compounds X and Y, Catalyst and Process A in the

diagram?

Compound X Compound

Y

Catalyst Process A

A Ethene Ethanol Phosphoric acid Oxidation

B Ethane Ethene Nickel Hydrogenation

C Ethane Ethene Nickel Oxidation

D Ethene Ethanol Phosphoric acid Hydrogenation

Volume of CO2 gas/ cm3

Time/ s

35

120

Steam/CatalystCompound YCompound X

Process A Acidified potassium

dichromate (VI)

CH3COOH


14/44

SULIT

SULIT 4541/114

32 The table shows the melting point and boiling point for substances P, Q, R

and S.

Substance Melting point/oC Boiling point/

oC

P 79 108

Q -180 -120R -95 69

S -160 -90

Which of the substances exists as a liquid at room temperature?

A Q

B R

C S

D P

33 The equation shows the reaction of the extraction of iron from iron(III) oxide.

What is the mass of iron which can be extracted from 10.0 g of iron(III) oxide?

[Relative atomic mass: Fe,56; O,16]

A 3.5 g

B 4.5 g

C 6.0 g

D 7.0 g

34 The table shows the proton number for element M and N. Element N is more

electronegative than element M because

Element Proton number

M 8

N 9

A atomic size of N is smaller

B atom N releases electrons easierC atom N has less valence electron

D atom N has larger number of neutron

2Fe2O3 4Fe + 3O2


15/44

SULIT

SULIT 4541/115

35 The diagram shows the information of elements X and Y

Which of the following is the diagram of electron arrangement for the compound

formed when element X reacts with element Y?

16

Y

8

7

X

3

A

C

B

D


16/44

SULIT

SULIT 4541/116

36 The diagram shows the voltaic cell.

Which of the following half-equations represent the reaction at the negative

terminal and positive terminal?

Negative Terminal Positive terminal

A Mg Mg2+ + 2e Cu2+ + 2e Cu

B Mg2+

+ 2e Mg Cu Cu2+

+ 2e

C Cu2+

+ 2e Cu Mg Mg2+

+ 2e

D Cu Cu2+

+ 2e Mg2+

+ 2e Mg

37 Which of the following solutions has the highest concentration of hydrogen ion?

A 50 cm3

of 1.0 mol dm-3

H2SO4 solutionB 50 cm

3of 2.0 mol dm

-3H2SO4 solution

C 100 cm3

of 1.0 mol dm-3

H2SO4 solution

D 150 cm3

of 1.0 mol dm-3

H2SO4 solution

38 The reaction between lead(II) nitrate and potassium iodide solution is represented

by the equation below

Pb(NO3)2 (aq) + 2KI (aq) PbI2 (s) + 2KNO3 (aq)

10.0 cm3

of 1.0 mol dm-3

potassium iodide solution is mixed with 20.0 cm3

of 1.0

mol dm-3

lead(II) nitrate solution.

What is the maximum mass of lead(II) iodide produced in this reaction?

[Relative atomic mass: I ,127 and Pb, 207]

A 3.34 g

B 4.61 g

C 6.68 g

D 9.22 g

Copper(II) chloride

solution

Copper

Magnesium nitrate

solution

Magnesium


17/44

SULIT

SULIT 4541/117

39 The diagram shows a structural formula of a polymer.

Which of the following is the monomer of the polymer?

H H

C C

H Cl n

Cl

Cl

Cl

Cl Cl

A

B

C

D


18/44

SULIT

SULIT 4541/118

40 The graph shows the volume of carbon dioxide gas released against time for the

reaction between 25 cm3

of hydrochloric acid with excess marble.

What is the concentration of acid used?

[Molar volume: 24 dm3

mol-1

at room temperature]

A 0.3 mol dm-3

B 0.4 mol dm-3

C 0.5 mol dm-3

D 0.6 mol dm-3

41

What is the molecular formula of compound X?[Relative atomic mass: C,12; H,1]

A CH2B C2H4C C2H6D C3H6

3.0 g of carbon reacts with 0.5 g ofhydrogen gas to form compound X.

Relative molecular mass of

com ound X is 42.

CaCO3 + 2HCl CaCl2 + CO2 + H2O

Volume of CO2/ cm3

180

Time/s


19/44

SULIT

SULIT 4541/119

42 Magnesium ribbon reacts with element Q from group 17 in Periodic Table.

Which of the following chemical equations is correct?

A Mg + Q MgQ

B Mg + Q2 MgQ2

C 2Mg + Q2 2MgQD Mg + 2Q MgQ2

43 Which of the following pairs show the correct uses of the isotopes?

Isotope Uses

I Cobalt-60 To destroy bacteria in food

II Carbon-14 To estimate the age of artifacts

III Iodine-131 To detect the location of tumour

IV Sodium-24 To detect leaks in underground petroleum

piping

A I and II only

B II and IV only

C I,II and III only

D I, II, III and IV

44 Sulphur dioxide gas, SO2 causes environmental pollution.

Which of the following environmental pollutions is affected by sulphur dioxide,

SO2?

I pH of the soil increases

II Lakes and rivers become acidic

III Salts are leached out of the top soil

IV Buildings and metal structures will corrode

A I and II only

B I and III only

C II, III and IV only

D I, II, III and IV


20/44

SULIT

SULIT 4541/120

45 Which of the following diagrams is used to electroplate an iron spoon with silver?

A

B

C

D

Iron spoon Silver strip

Silver chloride

Silver nitrate

Silver stripIron spoon


Silver chloride


Silver nitrate


21/44

SULIT

SULIT 4541/121

46 What is the volume of 0.2 mol dm-3

sulphuric acid solution required to completely

neutralize 50 cm3

of 0.2 mol dm-3

potassium hydroxide solution?

A 25 cm3

B 30 cm3

C 45 cm3

D 50 cm3

47 The diagram shows the structural formula of compound X.

Which of the following is an isomer of X?

Compound X

A

B

C

D


22/44

SULIT

SULIT 4541/122

48 Which pair of the organic compounds below can be distinguished by using

acidified potassium manganate(VII)?

A C2H6 and C3H8

B C2H5OH and C3H6

C CH3CH2COOH and CH3CHCHOH

D CH3CH2CH2CH3 and CH2CHCH2CH2CH3

49 Which of the following reactions represent the precipitation reactions?

I Pb(NO3)2 + Na2SO4 PbSO4 + 2NaNO3

II Ba(NO3)2 + 2KCl BaCl2 + 2KNO3III Pb(NO3)2 + 2KCl PbCl2 + 2KNO3IV Ca(NO3)2 + Na2SO4 CaSO4 + 2NaNO3

A I and III only

B I, II and III only

C I, III and IV only

D 1, II, III and IV


23/44

SULIT

SULIT 4541/123

50 The diagram shows the graph of volume of oxygen gas against time. Curve I is

obtained from the decomposition of 20 cm3

of 0.2 mol dm-3

hydrogen peroxide

solution.

Which of the following solutions will produce curve II?

A 40 cm3

0.1 mol dm-3

hydrogen peroxide solution

B 20 cm3

0.4 mol dm-3


C 30 cm3

0.2 mol dm-3


D 40 cm3

0.4 mol dm-3


END OF QUESTION PAPER

V

2V

Volume of oxygen /cm3

I

II

Time/s


24/44

1

SULIT 4541/1/2/3

4541

Chemistry

Marking Scheme

Mei

2008

BAHAGIAN SEKOLAH

KEMENTERIAN PELAJARAN MALAYSIA

______________________________________________

PEPERIKSAAN PERTENGAHAN TAHUN 2008

FORM 5 CHEMISTRY

MARKING SCHEME FOR PAPER 1, 2 AND PAPER 3

Peraturan pemarkahan ini mengandungi halaman bercetak.


25/44

2

PAPER 1

1 B 21 D 41 D

2 C 22 D 42 B

3 B 23 B 43 D4 C 24 A 44 C

5 D 25 C 45 B

6 A 26 A 46 A

7 B 27 D 47 B

8 A 28 A 48 D

9 D 29 C 49 C

10 D 30 A 50 B

11 D 31 A

12 C 32 B

13 A 33 D14 A 34 A

15 C 35 C

16 B 36 A

17 C 37 D

18 C 38 B

19 C 39 B

20 C 40 D


26/44

3

PAPER 2-SECTION A

No. Rubric Mark

1 a

b (i)

(ii)

c

d

e (i)

(ii)

(iii)

G

Has stable /octet electron arrangement//8 valence electron

2A + 2H2O 2AOH + H2

Use a small pieces//use a forcep// use a google

G,E,D, A,J,L

Has same valence electron// valence electron is 1

DE2 r: E2D

[can draw the diagram of electron arrangement correctly]

- Correct structure of atoms

- Correct ratio of atoms=1:2

Has (neutral ) molecule

TOTAL

1

1

1

1

1

1

1

2

1

10

2 a

b(i)

(ii)

c

d

e (i)

(ii)

(iii)

T1

PQ: solid + liquid

RS: liquid

Heat energy absorbed

is used to overcome the forces of attraction between particles

// Heat is absorbed to overcome the intermolecular forces

r: ion/atom

(1+1)

The particles / molecules move faster

Iodine/I2//napthalene/C10H8

Copper/ Cu

Ion

Diffusion

TOTAL

1

1

1

1

1

1

1

1

1

1

10


27/44

4

3 a (i)

(ii)

b (i)

(ii)

(iii)

c (i)

(ii)

d

3H2 + N2 2NH3

( Extract from ) air

Neutralization

H2SO4+ 2NH3 (NH4)2SO4

//H2SO4+ 2NH4OH (NH4)2SO4 + H2O

Fertilizer

Tin

In pure copper the layer of atom are easily slide over each

other when external force is applied on them.

The different size of foreign atoms in allloy are prevent the

layers of atom from slide each other when external force is

applied.

TOTAL

1

1

1

1

1

1

(1+1)

1

1

10

4 a

b(i)

(ii)

1 Diagram of set up of apparatus complete and functional

2 Label

(Anode) impure copper and (cathode ) pure copper

3 ( Electrolyte) copper (II) sulphate / copper (II) chloride // copper

(II) nitrate solution

a: chemical formula

1 become thinner // decrease in mass

2 become thicker // increase in mass

1 ( Remain )unchanged

2 Number of Cu2+

ions produced at anode same as number of

copper atoms produced at cathode // the rate of formation of Cu2+

1

1

1

1

1

1

Copper atomCopper atom

Tin atom


28/44

5

c (i)(ii)

d

ions at the anode is the same as the rate of discharge of Cu2+

at

cathode.

(Anode ):Cu Cu2+

+ 2e

(Cathode ): Cu2+

+ 2e Cu

Electroplating of metals/ Extraction of reactive metals

TOTAL

1

1

1

1

10

5 a

b

c (i)

(ii)

d

2H2O2 O2 + 2H2O

Number of mole of H2O2 = 20 x 2/1000= 0.04

2 mol of H2O2 produce 1 mol of O2 //

Number of mole of O2 = 0.04/2 = 0.02

Volume, O2 = 0.2 x 24dm3

= 4.8 dm3

Rate of reaction in experiment II is higher than experiment I

The concentration/number of molecule per unit volumeof

hydrogen peroxide in II is higher

The frequency of collision between H2O2 molecule is higher

The frequency of effective collision is higher

Volume of gas/cm3

Time(s)

Label Y axes and X axes

Correct curve and label I and II

TOTAL

1

1

1

1

1

1

1

1

1

1

10

II

I


29/44

6

6 a

b (i)

(ii)

(iii)

c (i)

(ii)

(iii)

d (i)

(ii)

(iii)

A compound that contain element of carbon and derive from living

organisms.

C2H4

ethene

double bond between carbon atoms

(a: C=C )

Acidified potassium manganat (VII) // Acidified potassium

dicromate (VI)

Oxidation

Purple to colourless // orange to green

C2H4 + H2O C2H5OH

Alcohol

Temperature 300oC // Pressure 60 atmosphere // concentrated

phosphoric acid

TOTAL

1

1

1

1

1

1

1

1

1

1

10


30/44

7

SECTION B

No. Rubric Mark

7 a (i)

(ii)

b

Compound that form when non metal atom gain/receive/accept

electron that release/lose/donate by metal atom to achieve stable

/octet/duplet electron arrangemen

Compound that form between non metal atom by sharing their

valence electron to achieve stable/octet /duplet electron

arrangement

Between P and Q

Atom X has 1 valence electron

Atom X loses/donates/transfers 1 electrons to form X+

ion //

XX+

+ e- and attain stable octet electron arrangement

Atom Y has 7 valence electrons

Atom gains/receives/accept 1 electron to formY-

ion//

Y + e-Y-

attain the stable /octet electron arrangement

The two oppositely-charged ions// the X+

and Y-

ion are

bonded together by a strong electrostatic force

To form a ionic compound with the formula XY// diagramn

Max 7

1

1

1

1

1

1

1

1

1

X

Y


31/44


32/44

9

8 a

b

c(i)

Empirical formula- Formula shows simplest ratio of atoms of each

element in the compound

Molecular formula- Formula shows actual number of atoms of

each element in the compound

Molecular Formula = ( Empirical formula )n

= ( CH2 )n

Relative Molecular Mass ( CH2 )n = 70

12n + 2n= 70

14n=70

n=5

Molecular Formula C5H10

1. Metal Z is cleaned using sand paper

2. A crucible and its lid are weighed and the mass is recoded

3. Metal Z is palced in the crucible. The crucible,lid and its

content is weighed and the mass is recorded.

4. The crucible with its content is heated strongly without

lid.

5. When metal Z start burn, the crucible is covered by its

lid

6. the covered is raise a little at intervals

7. When there is no more reaction, the lid is removed and the

crucible is heated strongly for a few minutes.

8. Cool the crucible and weigh the crucible,its lid and its

Content and record the mass.

9. The process of heating, cooling and weighing is repeated

until constant is obtained.

10. (Precaution step );

Close the crucible immediately to prevent loss of

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

TOTAL 20


33/44

10

Element Z O

Mass(g) 1.30 0.32

mol 1.30/65=0.02 0.32/16=0.02

Simplest

ratio

1 1

Empirical Formula ZO

TOTAL

1

1

1

1

1

20


34/44

11

PAPER2 SECTION C

No Rubric Mark

9 a

b (i)

(ii)

c(i)

Sample answer :

Zn + HNO3 Zn(NO3)2 + H2O

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

ZnO + HNO3 Zn(NO3)2 + H2O

Any two

Methanoic acid partial ionizes in water

produce low concentration of hydrogen ion

Glacial ethanoic acid has (neutral) molecule

Methanoic acid aqueous ionizes in water

to produce free moving ion

Procedure :

1 100 cm3

of 0.1 moldm-3

sulphuric acid is poured into a beaker

and heated slowly.

2 zinc carbonate is added into the sulphuric acid until in excess/no

longer dissolves.

3 Stir the solution and filtered.

4 The filtrate is poured into an evaporating dish and heat until

saturated

5 The hot saturated salt solution is allowed to cool

6 The crystals formed are filtered out, rinsed with distilled water

7 dried between sheets of filter paper.

2

1

11

1

1

1

1

1

1

1

1


35/44

12

(ii)

d

ZnCO3 + H2SO4 ZnSO4 + H2O + CO2

Number of mole , H2SO4 = 0.1( 100 )/1000

= 0.01

1 mol of H2SO4 produce 1 mol of ZnSO4

Mole of ZnSO4 = 0.01

Mass of ZnSO4 = 0.01 X 161

= 16.1 g

Sample answer :

1 ammonium chloride as a fertilizer

2 copper (II) sulphate as a pesticide

3 hydrated calcium sulphate to make plaster casts4 sodium chloride food additive

Any 2 suitable anwers(1+1)

TOTAL

1

1

1

1

1

1

20

10a (i)

(ii)

(iii)

(iv)

(v)

catalyst

esterification

CH3COOH + C3H7OH CH3COOC3H7 + H2O

Correct reactant

Correct product

Ethyl propanoate

Sweet smell/fruity smell/fragrant smell

//insoluble in water/soluble in organic solvent

//colourless

//less dense than water

any two properties (1+1)

1

1

1

1

2

2


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13

b (i)

(ii)

Bacteria will produce lactic acid/H+

ions which neutralize

negatives charge of the protein membrane/ rubber molecules

The rubber molecules will be collide with each other and

cause protein membrane broken Rubber polymer are released and lump together

Hydroxide ions/OH-

from ammonia solution will neutralise

H+

produced by acid

The protein membrane remains negatively charged

The rubber particles repel each others/ the rubber polymers

cannot combine and coagulate

The presence of cross-linkage of sulphur atoms between

the rubber molecule

When vulcanized rubber is stretched and release, the cross-

linkage will pull the chain back to their original

arrangement

Diagram

Improves the elasticity and strength of the rubber / make

vulcanized rubbers more resistant to heat /organic solvent

or

Resistant to oxidation :

The presence of cross-linkage of sulphur atoms between

the rubber molecule

Diagram

C=C in vulcanized rubber is less than C=C in the

unvulcanized rubber,

so vulcanize rubber is more resistant to oxidation

TOTAL

1

1

1

1

1

1

1

1

1

1

1

1

1

1

20


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14

PAPER 3

1 (a) KK0503 Measuring and using numbers

EXPLANATION SCORE

[Able to write all the times with units accurately]

Suggested answer:

t1 55.0 s, t2 48.0 s , t3 42.0 s , t4 37.0 s , t5 33.0 s

3

[Able to record all the times accurately but without units / no decimal place]

t1 55.0 , t2 48.0 , t3 42.0 , t4 37.0 , t5 33.0 //

// t1 55 s , t2 48.0 s , t3 42 s, t4 37s, t5 33s

2

[Able to write at least 3 readings of the times accurately] 1

No response given / wrong response 0

1 (b) KK0501- Observation

EXPLANATION SCORE

[Able to state the colour of sulphur and the rate of it is formed]

Suggested answer:

Pale / light yellow precipitate is slowly formed

3

[Able to state the colour of sulphur]

Pale / light yellow precipitate is formed.

2

[Able to state the formation of precipitate]

A precipitate is formed.

1


1 (c) KK0506 Communicating

EXPLANATION SCORE

[Able to construct a table correctly containing three labeled columns with

correct units and record all the time and 1/time accurately ]

Suggested answer:

Temperature,o

C

30 35 40 45 50

Time , s 55.0 48.0 42.0 37.0 33.0

1 / time , s-1 0.018 0.021 0.024 0.027 0.030

3

[Able to construct a table correctly containing three labeled columns with

correct units and record all the time and 1/time but not accurately]

2

[Able to write at least 3 readings of the times accurately] 1


1 (d) (i) KK0506 Communicating


38/44


39/44

16

30

35

40

45

50

0.015 0.020 0.025 0.030X

X

X

X

X

Temperature /o

C

1/time , s-1


40/44

17

1(e) KK0510 - State variables

EXPLANATION SCORE

[Able to state three variables and three action to be taken]Suggested answer:

Variable Action to be taken

Manipulated:

Temperature

Heat the sodium thiosulphate

solution at different temperature //

Use different temperature.

Responding:

Rate of reaction / time taken for X

marks to disappear from view.

Record the time taken for X mark

to disappear from view.

Controlled :

Concentration and volume of H2SO4,

concentration and volume of sodium

thiosulphate solution, size of conical

flask.

Use the same concentration and

volume of H2SO4 /sodium

thiosulphate solution // Use same

size conical flask.

3

[Able to state any two variables and any two action to be taken] 2

[Able to state any one variables and any one action to be taken] 1


2 (a) KK0506 CommunicatingEXPLAINATION SCORE

[Able to write the correct overall ionic equation]

Suggested answer:

Mg + Cu2+Mg

2++ Cu

3

Mg + CuSO4 MgSO4 + Cu 2

Mg Mg2+

+ 2e // Cu2+

+ 2e Cu 1


2(a)(i) KK 0504 Making inferenceEXPLANATION SCORE

[Able to state the correct inference]

Suggested answer:

Magnesium atom releases/donate/loses electrons to produce magnesium ion //

Magnesium is corrode.

3

Magnesium becomes thinner // mass of magnesium decreases 2

Magnesium dissolves 1



41/44

18

2(b) KK 0505 - Predicting

EXPLANATION SCORE

[Able to state the voltage value]

0.65 V

3

0.63 0.64 V // 0.66 0.67 V 2

< 0.64 V // > 0.67 V 1


2(c)KK 0508 Interpreting Data

EXPLANATION SCORE

[Able to arrange the position of all metals in an ascending order based on

tendency to release electrons correctly]

Copper > Lead > Iron > Zinc > Magnesium

3

[Able to arrange the position of all metals in descending order based on

tendency to release electrons]

Magnesium > Zinc > Iron > Lead > copper

2

[Able to arrange the position of at least four metals in ascending order based

on tendency to release electrons correctly]

1


2(d) KK0509 Operational definitionEXPLANATION SCORE

[Able to state the correct and complete operational definition]

Suggested answer:

The further the metal is from copper in the electrochemical series, the greater

is their voltage reading. //

3

[Able to give incomplete relationship]

Suggested answer:

The further apart the metal is in the electrochemical series, the greater thepotential difference / voltage reading.

2

[Able to state an idea]

Suggested answer:

The position of metal influence the voltage reading //

Type of metal influence the voltage reading.

1



42/44

19

3.(a) KK051021 Statement of problem

EXPLANATION SCORE

[Able to make a suitable statement of problem]

Suggested answer:

How to differentiate between magnesium nitrate solution and calcium nitrate

solution // How to differentiate between magnesium ion and calcium ion

3

[Able to make a suitable aim]

Suggested answer:

To differentiate the presence of magnesium ion and calcium ion by using

aqueous ammonia solution.

2

[Able to state an idea of statement of problem or aim] 1


3(b) KK051202 Stating hypothesis

EXPLANATION SCORE

[Able to state the relationship between manipulated variable and responding

variable correctly]

Suggested answer:

If the addition of aqueous ammonia solution forms white precipitate which is

insoluble in excess ammonia aqueous solution, then the solution tested is

magnesium nitrate. // If aqueous ammonia solution is added and no changeoccur then the solution tested is calcium nitrate.

3

[Able to state the relationship between manipulated variable and responding

variable]

2

[Able to state an idea of the hypothesis] 1


3 (c) KK051202 Stating variables

EXPLANATION SCORE

[Able to state all the three variables correctly]Suggested answer:

Manipulated variable : magnesium nitrate and calcium nitrate // Mg2+

and Ca2+

Responding variable: formation of white precipitate

Controlled variable : aqueous ammonia solution

[Able to state any two of the variables correctly]

[Able to state one of the variables correctly or state idea regarding variable]

No response given / wrong response


43/44

20

3(d) KK051205 List of substances and apparatus

EXPLANATION SCORE

[Able to state the list of substances and apparatus correctly and completely]

Suggested answer:

Test tube, dropper, test tube rack

0.5 mol dm-3

magnesium nitrate solution, 0.5 mol dm-3

calcium nitrate

solution, aqueous ammonia solution.

3

[Able to state the list of substances and apparatus correctly but not

completely]

Suggested answer:

Test tube

0.5 mol dm-3

magnesium nitrate solution, 0.5 mol dm-3

calcium nitrate

solution, aqueous ammonia solution.

2

[Able to state an idea about the list of substances and apparatus]

Suggested answer:

Test tube

magnesium nitrate, calcium nitrate

1


3(e) KK051204 Technique /Precedure

EXPLANATION SCORE[Able to state a complete experimental procedure]

Suggested answer:

1. 2 cm3

of solution A is poured into a test tube.

2. A few drops of aqueous ammonia solution are added into the test tube

using a dropper and the test tube is shaken well.

3. If the precipitate is formed, aqueous ammonia solution is added

continuously until no further change occurred / until excess

4. The mixture is shaken well.

5. The changes occur is recorded in a table.

6. Steps 1 to 4 are repeated using solution B.

3

[Able to state a complete experimental procedure]

1,2,3,4,5

2

[Able to state a complete experimental procedure]

1,2,3,5

1



44/44

3(f) Tabulation of data

EXPLANATION SCORE

[Able to exhibit the tabulation of data correctly ]

Reagent Observation

Test tube/Solution A Test tube/Solution B

Aqueous

ammonia solution 3

[Able to exhibit the tabulation of data less accurately ]

Reagent Test tube /Solution A Test tube/Solution B

Aqueous

ammonia solution

2

[Able state an idea about the tabulation of data] 1


END OF MARKING SCHEME

kimia p1 sbp mid year spm 2008

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