Page 17 - 1202 Question Bank Chemistry Form 5 KSSM

2. General properties of synthetic rubber:
(a) Resistant to heat. (d) Hard.
(b) Resistant to chemicals. (e) Heat insulator.
(c) Resistant to oxidation. (f) Elastic.

3. The properties and use of synthetic rubber:
Synthetic rubber Monomer Properties Uses
• Resistant to high heat
Styrene-Butadiene Styrene and • Easily vulcanised Tyres
Rubber (SBR) butadiene, C H Shoe soles
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4 6 • Corrosion resistance
• Elastic
• Resistant to high heat Water pipe, gloves,
Neoprene Chloroprene, C H Cl • Strong tensile strength electrical wire insulators,
4 5
• Resistant to oxidation petrol rubber hose
• Not inflammable
• Less permeable than natural rubber Inner tube of tyres, roofing
• Resistant to heat materials, nonpermeable
Butyl rubber Isobutylene, C H
4 8 • Can be vulcanised with sulphur layer to prevent diffusion
under normal condition of water in reservoir
1,2-dichloroethane, Very resistant against chemical Lining for oils and solvents
Thiokol rubber
C H Cl solvents and oils storage tanks
2 4 2
4. Advantages of synthetic rubber: 5. Disadvantages of synthetic rubber:
(a) Withstand inclement weather and high (a) Ability to absorb vibrations, sound, shock is less
temperatures. compared to natural rubber.
(b) Non-inflammable and can withstand heat. (b) Elasticity and tensile strength are less compared
(c) Good heat and electrical insulators. to natural rubber.
(d) Not easily permeable by gas and water.
(e) Very high resistance towards chemicals.

PAPER 1

Each question is followed by four options A, B, C or D . Choose the best option for each question.

4.1 Polymers

1. Which of the following is the correct pair of 3. Which polymer has the empirical formula of
natural polymer and its monomer? CH ?
2
Natural polymer Monomer
A H H C H H
A Polyisoprene Propene
C C C C
B Starch Amino acid
H C H n H C H n
6 5 2 5
C Cellulose Glucose
D Protein Isoprene B H H D H H
C C C C
2. Which substance is a natural polymer?
H H n H CH 3 n
A Polythene C Polyisoprene
B Polypropene D Polyvinyl chloride

80 Question 2: Question 3:
SOS TIP Polyisoprene is the name of natural rubber. Empirical formula for polymers is the same as its monomer.