Post on 09-Apr-2018
8/8/2019 Modul Hikmah 14
1/5
8/8/2019 Modul Hikmah 14
2/5
HIKMAH MODULE
144
7. Diagram 1 shows a reversible chemical reaction.
What are process X and Y?X Y
A. Polymerisation DepolymerisationB. Depolymerisation PolymerisationC. Depolymerisation HydrolysisD. Polymerisation Condensation
8. Natural rubber is soft, elastic and not heat resistant. How can it be made harder, moreelastic and more heat resistant?
A. Heat it with carbonB. Add vinegar with it
C. Immerse it in ammonia solutionD. Heat it with sulphur
9. Why is polystyrene suitable as food containers
A. It is thermoset plasticB. It can be moulded and recycled repeatedlyC. It is heat resistantD. It is non-flammable
10. Which is a natural polymer?A. PerspexB. ProteinC. PVCD. Neoprene
Molecules of aminoacids
X
YProtein
Diagram 1
8/8/2019 Modul Hikmah 14
3/5
HIKMAH MODULE
145
PAPER 2SECTION A + B
1. The figure below shows the making up of synthetic monomers into polymers
a) Give the definition of [2 marks]i) polymer
________________________________________________________________
ii) monomer
________________________________________________________________
b) Identify process X [1 mark]
______________________________________________________________________
c) Name two plastics which have linear polymers as shown in the diagram. State oneuse for each of the plastics named. [4 marks]
Plastic A:_______________________________________________________________
Plastic B :______________________________________________________________
d) Name both monomer and polymer for natural rubber? [2 marks]i) Monomer:
_______________________________________________________
Synthetic monomers
X
Polymers
8/8/2019 Modul Hikmah 14
4/5
HIKMAH MODULE
146
ii) Polymer:
_______________________________________________________
2. a) Differentiate between thermoplastics and thermosetting plastics in terms of theircapacity to be moulded. [ 2 marks]
Thermoplastic Thermosetting plastic
b) What is the reason for this difference in property between these two classes ofplastics? [2 marks]
______________________________________________________________________
c) Give one example of the thermoplastic and one for thermosetting plastics. [2 marks]
Thermoplastic Thermosetting plastic
d) State two ways in which plastics may cause pollution to the environment. [ 2 marks]i)
________________________________________________________________
________________________________________________________________
ii)_______________________________________________________________
_______________________________________________________________
SECTION C
1. (a) List down four products made up by synthetic rubber. [4 marks](b) Name a process to improve the quality of natural rubber. Lists 2 of its
Improvement. [3 marks].(c) Lists down 3 characteristics of a synthetic rubber. [3 marks]
8/8/2019 Modul Hikmah 14
5/5
HIKMAH MODULE
147
MODULE 14 - ANSWERS
PAPER 11. B2. C3. D
4. B5. C6. A7. A8. D9. B10. B
PAPER 2SECTION A + B
1. (a) (i) a combination of monomers which bound together
(ii) a small unit of molecule(b) Polymerisation(c) Plastic A: Thermoplastics : plastic mineral bottles, plastic bag, plastic wrapping
Plastic B: Thermosetting plastics: melamine plates, mugs and protective coveringsof electrical appliances
(d) i) isopreneii) polyisoprene
2. a.Thermoplastic Thermosetting plastic
Can be remoulded more than
once/repeatedly
Only can be remoulded once
b. Thermoplastics do not cross links between the polymers, so that it can easily slideThermosetting plastics have cross links between polymers, so it will restrict their
ability to slide over one anotherc.
Thermoplastic Thermosetting plastic
Polythene/ Perspex Bakelite/ Epoxy glue
d. It produces toxin gases when burnt They can choke drains and other drainage system
Most of them are non-biodegradable, thus it can pollute soil and water
Section C1 (a) Gloves, raincoat, hoses, gaskets and fan belt.
(b) Vulcanisation. Much harder, more resistant or more durable to chemical changes.(c) Elastic, heat resistant, water resistant, chemical resistant, oil resistant, strong