7/27/2019 Answers Paper 1& 2 Final Year Exam Form Four 2007

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ANSWERS PAPER 1 FINAL YEAR EXAM FORM FOUR 2007

1 C 11 A 21 B 31 C 41 D

2 B 12 D 22 D 32 C 42 D

3 D 13 D 23 A 33 D 43 C

4 C 14 B 24 A 34 B 44 A

5 B 15 A 25 C 35 A 45 B

6 B 16 D 26 B 36 A 46 B

7 B 17 D 27 A 37 A 47 D

8 B 18 C 28 D 38 C 48 B

9 D 19 C 29 B 39 B 49 C

10 C 20 C 30 C 40 B 50 B

ANSWERS PAPER 2

SECTION A

1. (a) (i) The amount of ammonium salt added to the water.

(ii) The volume of water

(a) 29C(b) The temperature of the solution will decrease when more ammonium salt is added to it.

2 (a) Atomic substances conduct electricity in both the solid and liquid states. Molecularsubstances do not conduct electricity in both the solid and liquid states. ionic

substances conduct electricity only in the liquid states.

(b) Solid : no

Molten/liquid : yes

(c) i. Type of substance

ii. Electrical conductivity/Ability to conduct electricity in solid or liquid state

(d) Atomic substances are those substances that can conduct electricity in both the solidand liquid state.

7/27/2019 Answers Paper 1& 2 Final Year Exam Form Four 2007

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3 (a)

(b) Absorb heat energy

(c) i. Melting

ii Boiling

4 (a)

(b) * Magnified* Real* Inverted

(c) 2.8 cm

(d) * Microscope* Slide projector

(e) The image will be virtual and upright

X

2F FO

F 2F

7/27/2019 Answers Paper 1& 2 Final Year Exam Form Four 2007

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5 (a) Sensory neurone

(b) Because it transmits nerve impulse from the receptor to the central nervous system.

(c) X : Cell body Y : Axon

(c) Skin/Eye/Tongue/Ear/Nose

6 (a) Carbohydrate

(b) (i) Insulin

(ii) Pancreas

(c) (i) He may suffer from diabetes mellitus

(ii) The excess glucose is excreted through the urine.

7 (a) Variations are differences of the characteristics between individuals of aspecies.

(b) i: Discontinuous variation

ii: Because the graph shown is a discrete distribution not present to show the differences betweenthem.(c)1: Ability to role the tongue.

2: Ear lobe present or absent

8 a). Geiger-muller counter

b). i. Gamma radiation is used to kill cancerous cells

ii. Beta radiation is used to check the thickness of paper, plastic and metalsheets.

c). Nuclear fission

d). Malaysian Institute of Nuclear Technology (MINT)

9 a X nickel

Y - iron

b. A bronzeB duralumin

c. chromium

10 a) i) silver plateii)Iron spoon

b) i) coated with a thin silver layerii) becomes thin

c) electrical energy -------- Chemical energy

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Section C

11 (a) The presence of salt increase the boiling point of a pure liquid.

(b) i. To study the effect of impurities on the boiling point of a pure liquid.

ii. constant variable : volume of distilled water.

manipulated variable : the presence of salt.

responding variable : boiling point of the liquid.

i. Distilled water, salt, beaker, wire gauze, tripod stand, Bunsen burner andthermometer.

iv. Procedure:

Distilled water is poured into a beaker until it is half full.

The water is heated until it boils. The temperature while the water boils is recorded.

Two spatula of salt are added into the distilled water and the mixture is boiled.

The temperature of the boiling mixture of water and salt is recorded.

v.

Material Boiling point (oC)

Distilled waterMixture of distilled water and salt

12 (a)

Physical changes Chemical changesLess energy is needed More energy is needed

No formation of new products Formation of new products

Easily reversible Difficult to reverse

Changes in physical properties only Involve changes in chemical properties

[ 4 marks]

(b) All the four reaction have some common characteristics(i) Easily reversible [1](ii) Involve changes in physical properties only [1]

Therefore, it can be conceptualised that all four reactions in the given examples are physicalchanges. Physical changes are changes which invove physical properties only.[1]

7/27/2019 Answers Paper 1& 2 Final Year Exam Form Four 2007

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For example, when ice melts, it changes to water, both ice and water are made of H2O molecules.They are the same compound, but only change in terms of physical state.

[1]

However when candle burs, the wax burns in oxygen to produce carbon dioxide and water. New

products are formed. Hence, the burning of candle cannot be classified as a physical change.[1]

The actual concept for physical changes Can be defined as:Physical changes are changes that involve physical properties. No new products of differentchemical properties are produced. Physical changes are easily reversible.

[1]_______

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13(a) Process : Neutralisation[1 mark]

Ammonium salt fertilizers are produced from the reaction between ammonium hydroxide and an acid.[ 1 mark ]

Salt and water are form from neutralization process. [ 1 mark ]

Salt and water was evaporated to form salt solution. [ 1 mark ]

Then the salt solution was cooled and crystallized to form Ammonium salt fertilizers[ 1 mark ]

(b)

Identify Problem Water pollution

Clarification the Problem The river is polluted by the ammonium salt fetilizer

Solving Methods 1. Enforcement of laws.2. Application of technology3. Education

The best method.Explain

Application of technology.-Biological control and natural fertilizers used in

organic farming help reduce pollution caused byagricultural waste.

[ 5 marks]