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What are the raw materials used in the preparation of bakelite? Write two its uses.
Raw materials used in the preparation of bakelite are :-
phenol and formaldehyde.
Uses of Bakelite :
(i) It is used for making electrical switches and plugs.
(ii) It is used for making gear wheels and table top laminates.
Explain why some fibres are called synthetic.
Rayon is different from synthetic fibre because
Synthetic fibres are also called _______ or _____ fibres.
Synthetic fibres are synthesised from raw material called ______.
Like synthetic fibres, plastic is also a ________.
Give examples which indicate that nylon fibres are very strong.
Explain why plastic containers are favoured for storing food.
Explain the difference between the thermoplastic and thermosetting plastics.
Explain why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards
Categorise the materials of the following products into ‘can be recycled’
and ‘cannot be recycled’:
Telephone instruments, plastic toys, cooker handles, carry bags, ball point
pens, plastic bowls, plastic covering on electrical wires, plastic chairs,
electrical switches.
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