SULIT 1 4541/2/PP

4541/2/PP Peraturan Permarkahan Chemistry Kertas 2 Okt/Nov 2012

MPSM PAHANG

PEPERIKSAAN PERCUBAAN SPM TAHUN 2012

TINGKATAN 5

CHEMISTRY

Kertas 2

PERATURAN PEMARKAHAN

_____________________________________________________________________

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Amaran

Peraturan pemarkahan ini adalah SULIT.

SULIT 2 4541/2/PP

MARKING SCHEME / SKEMA PERMARKAHANCHEMISTRY PAPER 2

TRIAL SPM MPSM PAHANG 2012

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R

SULIT 3 4541/2/PP

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NO Answers Marks

1.a)

b)(i)

(ii)

c)

d)(i)

(ii)

e)(i)

C3H6

CnH2n+1 OH

C3H7OH C3H6 + H20

H H H H H H

H- C –C- C - H

H – C – C – C -O H

H H H H OH H

Propan-1-ol Propan-2-ol

(any one)Propane

C3H6 + H2 C3H8

-Formula reactant correct

-Formula product correct

Propyl ethanoate

1

1

1

1+1

1

1

1

1

9

2.a)

(i)

(ii)

Number of proton in nucleus of its atom

15

1

1

b) Nucleon number 1

c)(i) Q and R have different number of neutron/nucleon number 1

(ii) Carbon 14 - to estimate the age of fossils and artifacts

Cobalt 60 - kill cancer cells,sterilised medical instruments

Sodium 24-detect leakage of underground pipes

(any one)

1

d (i)

(ii)

iii)

2.8.7

7

Draw diagram:

1

1

Figure of electron arrangement of R

3 shells

1

1

9

3.a)

( i)

(ii)

(iii)

b)

c)

d)

e)

f)

g)

Z

Q

Y

Q, P, Z, Y, T

4

Z has higher number of protons than T. Hence it has stronger

nuclei attraction on the electrons.

Y3+

Transition Elements

Their ions or compounds are colored//They form complex

ions or compounds/they are good catalysts//They can have

variable oxidation.

1

1

1

1

1

1 + 1

1

1

1

10

4.a)

b.(i)

(ii)

(c)

d)(i)

(ii)

e)

f)

H+ , Cu 2+ ,

SO42- , OH -

Bubbles of gas released

Concentration of Cu2+ decrease // Cu 2+

discharge to form Cu atom

Cu2+ + 2e Cu

Anode become thinner / smaller / mass

decrease

Cathode become thicker / bigger / mass

increase

Correct diagram

Copper electrode at anode

Steel spoon at cathode

Copper (II) sulphate as electrolyte

Correct label

Hydroxide ion

1

1

1

1

1

1

1

1

1

1

10

5.a)

b)

c)

d)

e)

Pink to colourless

The point in the titration at which the indicator changes

colour

H2SO4 + 2NaOH Na2SO4 + 2H2O

Sodium sulphate and water

M1V1 = 1 M2V2 2

0.25 × V1 = 10.5 × 25 2

1

1

1+1

1

1

1

SULIT 4 4541/2/PP

END OF MARKING SCHEME

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