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CHONG HWA INDEPENDENT HIGH SCHOOL

CHEMISTRY

SENIOR MIDDLE LEVEL 1 (PING)

TOPICAL EVALUATION TEST 1

(CHAPTERS COVERED: 1-2)

PAPER 1

Question Answer Question Answer

1 C 6 C

2 C 7 D

3 B 8 A

4 D 9 A

5 A 10 B

PAPER 2 [SECTION A]

Question Mark Scheme Marks

Allocation

1(a) Diffusion 1 m

1(b) Ions 1 m

1(c) Copper (II) sulphate is made up of tiny and discrete  particles

Diffuse upwards slowly

Into the spaces between the gel

1 m

1 m

1m

1(d) 22 hours

 Notes:o  The answer must be a figureo  Any suitable answer is acceptable (less than 24 hours)

1 m

1(e) Heat energy absorbed

Kinetic energy of copper(II) sulphate particles increases

1 m

1 m

TOTAL

8 MARKS

Question Mark Scheme Marks

Allocation

2(a) (i) Proton number is the number of protons in the nucleus of anatom.

(ii) Mass number is the sum of protons and neutrons in thenucleus of an atom.

1 m

1 m + 1 m

2(b) 2.8 1 m

2(c) (i) A and C

(ii) They have the same number of protons but different

1 m

1 m

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number of neutrons // nucleon numbers.

(iii) They have the same electron arrangement.

(iv) State two isotopes and two respective uses.

- 

Cobalt-60  –  treatment of cancer-  Iodine-131  –  treatment of thyroid cancer-  Carbon-14  –  study of photosynthesis in plant

-  Krypton-80 control the thickness of plastic sheets

( Any two answers guarantee full marks)(Accept any suitable answer)

1 m

2 m + 2 m

2(d) (i) 5

(ii) 147B

1 m

1 m

2(e) Group : 14

Period: 2

1 m

1 m

TOTAL

15 MARKS

Question Mark Scheme Marks

Allocation

3(a) Melting 1 m

3(b) (i) solid

(ii) solid and liquid

(iii) liquid

(iv) liquid and gas

(v) gas

1 m

1 m

1 m

1 m

1 m

3(c) Heat energy absorbed

Overcome the forces of attraction between the particles

1 m

1 m

3(d) 90

o

C 1 m

TOTAL

9 MARKS

PAPER 2 [SECTION B]

Question Mark Scheme Marks

Allocation

1 X - Solid

-  Closely packed in orderly manner-  Vibrate and rotate

- 

Strongest forces of attraction between particles-  Lowest energy content

1 m1 m

1 m1 m

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X - Liquid-  Closely packed in disorderly manner-  Vibrate, rotate and translate-  Weaker forces of attraction between particles as

compared to solid-  Higher energy content as compared to solid

1 m1 m1 m

1 m

TOTAL

8 MARKS

Prepared by:

…………………………………..

MR. CHEONG BOON YAU

Chemistry Teacher (S.M.1 Ping)