Complete the following table: Name of polymer Its properties Uses (i) Polythene Flexible but partially solid (like wax), insulator of electricity, inactive towards chemicals (ii) Teflon High melting point, poor conductor of electricity, significantly inert towards chemicals To prepare non-stick utensils, to coat on paint of cars, in chemical industries (iii) PVC Transparent or opaque, hard, inert towards water, oil, petrol and some other chemicals To prepare water pipes, insulation of electric wires, containers for raincoat, gum boot, slippers. (iv) Nylon Transparent, strong, water-resistant fibre. (v) Terylene Does not absorb water just like nylon, resistant to stains, strong, resistant to creasing, a fibre with long life. Cotton threads are mixed with it to prepare terecot. Just like terylene, it is also resistant to folding, but as cotton threads are present, it can soak water and air can pass through it. So it is widely used to make clothes in a moist tropical country like ours.

Polymers are the long chain compounds made from the smallest repeating units called monomers. Different polymers are used in different fields according to their properties. The given table can be completed as, Name of polymer Its properties Uses (i) Polythene Flexible but partially solid (like wax), insulator of electricity, inactive towards chemicals It is used to make packaging film, garbage bags, grocery bags and insulation for wires and cables. (ii) Teflon High melting point, poor conductor of electricity, significantly inert towards chemicals To prepare non-stick utensils, to coat on paint of cars, in chemical industries (iii) PVC Transparent or opaque, hard, inert towards water, oil, petrol and some other chemicals To prepare water pipes, insulation of electric wires, containers for raincoat, gum boot, slippers. (iv) Nylon Transparent, strong, water-resistant fibre. It is used in the field of clothing, used for making car tyres, ropes or threads. (v) Trylene Does not absorb water just like nylon, resistant to stains, strong, resistant to creasing, a fibre with long life. Cotton threads are mixed with it to prepare terecot. Just like terylene, it is also resistant to folding, but as cotton threads are present, it can soak water and air can pass through it. So it is widely used to make clothes in a moist tropical country like ours.

A piece of cotton and that of a synthetic cloth remain buried in soil, what will we find after a few months? Type of cloth What you will find Cotton cloth Synthetic cloth

Cotton cloth is a biodegradable fabric and synthetic fibres are non-biodegradable as they are mostly made of plastics or polymers. Therefore, the given table can be completed as, Type of cloth What you will find Cotton cloth Cotton clothes will get decomposed completely in the soil after few months as it is a fibre of plant origin. Synthetic cloth Synthetic cloth will not decompose easily as it contains synthetic polymers or plastics which will not decompose easily in the soil.

E M B I B E

Environment and Science Class 8>Chapter 4 - Occurence of Carbon and its Compounds in Nature>Exercise 8>Q 1

HARD

8th West Bengal Board

IMPORTANT

Earn 100

Complete the following table:

Materials used in making objects Where is it used

Polythene Making carry bags, food packets

Plastic Making mugs, buckets, etc.

Thermocol

Nylon

Important Questions on Occurence of Carbon and its Compounds in Nature

MEDIUM

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 4 - Occurence of Carbon and its Compounds in Nature>Exercise 8>Q 2

Look at the pictures below, and identify the sectors in which polymers are used.

Question Image

HARD

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 4 - Occurence of Carbon and its Compounds in Nature>Exercise 9>Q 1

Complete the following table:

Name of polymer	Its properties	Uses
(i) Polythene	Flexible but partially solid (like wax), insulator of electricity, inactive towards chemicals
(ii) Teflon	High melting point, poor conductor of electricity, significantly inert towards chemicals	To prepare non-stick utensils, to coat on paint of cars, in chemical industries
(iii) PVC	Transparent or opaque, hard, inert towards water, oil, petrol and some other chemicals	To prepare water pipes, insulation of electric wires, containers for raincoat, gum boot, slippers.
(iv) Nylon	Transparent, strong, water-resistant fibre.
(v) Terylene	Does not absorb water just like nylon, resistant to stains, strong, resistant to creasing, a fibre with long life.	Cotton threads are mixed with it to prepare terecot. Just like terylene, it is also resistant to folding, but as cotton threads are present, it can soak water and air can pass through it. So it is widely used to make clothes in a moist tropical country like ours.