Paper 2 Spm Trial2007

7/27/2019 Paper 2 Spm Trial2007

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SULIT 4551

4551

Chemistry

2012

1 Hour

PUSAT TUISYEN ERA PELANGI

PEPERIKSAAN PERTENGAHAN TAHUN SPM 2012

CHEMISTRY

1 Hours 30 Minutes

DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO

1. Tuliskan nama dan angka giliran anda pada ruangan yang disediakan.

2. Calon dibenarkan menjawab keseluruhan atau sebahagian soalan sama ada dalam

bahasa Melayu atau bahasa Inggeris.

SECTION FULL MARK MARKS OBTAINED

OBJECTIVE 13

STRUCTURE 1 10

2 10

3 10

1

2

3

ESSAY SECTION

B

20

SECTIONC

20

SECTION

B

SECTIONC

EXPERIMENT 17

OVERALL 100

NAMA CALON


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OBJECTIVES [13 MARKS]

1. When 1.52 g of a metal oxide of Z is reduced, 1.04 g of the metal is obtained. Determine

the empirical formula of the metal oxide. [RAM: O,16; Z,52].

A ZO2B Z2O

C Z2O3D Z3O2

2. Which of the following chemical equation is balanced?

A 2NH4Cl + Ca(OH)2 CaCl2 + 2NH3 + H2O

B 2Cu(NO3)2 heat 2CuO + 4NO2 + O2

C KI + Pb(NO3)2 PbI2 + KNO3D CuCO3 + HNO3 Cu(NO3)2 + CO2 + H2O

3 In a chemical reaction of calcium carbonate with hydrochloric acid, 36cm 3 of carbon

dioxide gas is collected at room temperature. What is number of mole of carbon dioxidecollected?

[1 mole of gas occupies a volume of 24 dm3 at room temperature and pressure]

A 0.0015 mol

B 0.067 mol

C 1.50 mol

D 1.61 mol

4. Which noble gases given below is used to fill airships and weather balloons ?

A Helium

B Neon

C Argon

D Xenon

5. Table 5 shows the electrolysis of two solutions using carbon electrodes.


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What are the products P and Q?

P Q

A Chlorine gas Silver

B Chlorine gas Oxygen gas

C Oxygen gas Hydrogen gas

D Oxygen gas Silver

6. Which of the following statements is true about an acid?

I An acid turns blue litmus paper red.

II An acid contains hydrogen ion in aqueous solution

III An acid has a pH more than 7

IV An acid reacts with metal to give off hydrogen gas.

A I and II

B III and IV

C I, II and IV

D II, III and IV

7. Two experiments are carried out as follows:

Experiment I 100 cm3 of 1.0 M HCl is added to 10g of marble chips at 30oC.

Experiment II : 50 cm3 of 1.0 M HCl 1.0 M is added to 10g of marble chips at 50oC.

Which of the following graphs shows the volume of carbon dioxide (V) collected against

time (t) in both the experiments?

Electrolyte Product formed at

Anode Cathode

Sodium chloride solution 1.0 mol dm-3 P Hydrogen

Silver nitrate solution 1.0 mol dm-3 Oxygen Q


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SULIT 4551

A

B

C

D

8. Excess zinc metal is added to 50 cm3 of 0.2 mol dm-3 of hydrochloric acid. The hydrogen

gas evolved is collected at 20 second intervals. The results are tabulated in Table 6:

Time /seconds 0 20 40 60 80 100

Total volume of

H2/cm3

0 30 55 75 90 90

What information can you obtain from the result of the experiment?

I No hydrogen gas is given off at time 100 seconds.


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SULIT 4551

II The average rate of reaction is 0.9 cm3 s-1.

III The total volume of hydrogen gas collected is 340 cm3.

IV The rate of release of hydrogen gas decreases with time.

A IV only

B I and IVC I, II and IV

D I, III and IV

9. The general formula of an organic substance that can decolourise the purple colour of

acidified potassium permanganate(VII) solution is

A CnH2n+1OH

B CnH2n+1COOH

C CnH2nD CnH2n+2

10. Which of the following pairs of substances are notisomers ?

A Hexane and 2,3-dimethyl pentane

B 1-butene and 2-methylpropene

C Pentane and 2,2-dimethylpropane

D 2-chloropentane and 3-chloropentane

11. In which of the following compounds is the oxidation number of nitrogen the highest?

A KNO2B NH4Cl

C N2O

D HNO3

12.

Magnesium ribbon, tin foil, copper foil and zinc foil are coiled around four different ironnails. The metal pairs are then placed in a test tube containing aqueous sodium chloride

solution. Which of the test tubes will contain the highest concentration of iron(II) irons

after 2 days.

A W

B X

C Y

D Z

13. When a mixture of carbon and copper(II) oxide is heated strongly


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I the oxide ion loses two electrons..

II the oxidation number of carbon increases from 0 to +4

III the copper(II) oxide acts as the reducing agent. .

IV the copper(II) ion accepts two electrons

A I and IIIB II and IV

C II, III and IV

D I, II, III and IV

STRUCTURE [ 30 Marks]

Answerall questions in this section.

1 Table 1 shows the number of protons and neutrons of three atoms.

Atom Number of protons Number of neutrons

S 16 17T 16 18

U 17 18

V 18 17

a) (i) What is meant by the proton number and nucleon number of an atom?

Proton number

Nucleon number

[1 mark]

(ii) Represent atom S in the form ofA

ZX

[1 mark]

(iii) Which of the atoms are isotopes?

(iv) State a reason for your answer in (d)(i)

[1 mark]

(b) An organic compound Q has of 64.87% of carbon, 13.51% of hydrogen 21.62% of oxygen.

[Relative atomic mass: H,1 ; C,12 ;O, 16]


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(i) Determine the empirical formula of compound Q.

[1 mark]

(ii) If the relative molecular mass of compound Q is 74, find the molecular formula of compound Q.

[1 mark]

Atom A Atom B

(c) Write the electron arrangement for atom A and B.

[1 mark](d) A and B can form a compound.

i) What type of bond holds atom A and B together?

ii) What will happen to atom A during the formation of the compound with atom B?

[1 mark]iii) Draw the electron arrangement of the compound formed in (b)(ii)


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[2 marks]

iv) State two physical property of the compound formed

...... [1 mark]

3 A student carried out three experiments to study a factor that affects the rate of reaction. Diagram 1

shows the result for the experiment.

Experiment

EksperimenI II III

Set-up

apparatus for

theexperiments

Temperature /0

C 30 40 40

Time taken for

all the

magnesiumdissolved/ s

50 20 15

(a) Write a chemical equation for the reaction between magnesium and hydrochloric acid.

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

[ 1 mark](b) (i) Name the gas produced in the experiment above.

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

(ii) Calculate the maximum volume of the gas produced in the experiment.

[Relative atomic mass : Mg,24;Volume of 1 mole of gas at room temperature = 24 dm3 ]

Excess

hydrochloric acid

1.2g magnesium ribbon


Excess

hydrochloric acidExcesshydrochloric acid



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[1 mark](c ) Calculate the average rate of reaction for:

(i) Experiment I

(ii) Experiment II

(iii) Experiment III

[ 2 marks](d) Diagram shows the set up of the apparatus to investigate electron transfer through a distance.

Rajah 2 menunjukkan susunan radas suatu eksperimen untuk mengkaji pengaliran elektron melalui

satu jarak.

a) Label the negative terminal of the cell on in Diagram. [1 mark]

b) State the function of the dilute sulphuric acid.

[1 mark]

c) Name the reducing agent in the experiment

[1 mark]

d) Write the half equation for the reaction that occurs at silver electrode

Magnesium

electrodeZink electrode

Sulphuric acid

Magnesium

nitrateZinc

nitrate

Silver

Argentum

Magnesium

Magnesium sulphatesolution

Larutan magnesium

sulfat

Silver nitrate solutionLarutan argentum sulfat

Dilute sulphuric acid

Asid sulfurik cair


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SULIT 4551

[1 mark]

f) What is the change in oxidation number of magnesium?

[1 mark]

Paper 2 Spm Trial2007

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