Question

Plzz answers all these.
These are from ch fibres
Class 8th...​

Answer 1

1. The polymer cellulose is made up of a large number of the monomer units.
2. The silk fiber is obtained from the silkworm whereas artificial silk is obtained treatment of wood pulp.
3. Polythene which is used to make polythene bags is an example of thermoplastics.
4. Plastics do not react with air and water.
5. Plastics are generally cheaper/lighter (lightweight) than metals.
6. Teflon is special plastics on which oil and water do not stick.
7. We should always remember the 5R principle: reduce, recycle, refuse, reuse, repurpose.

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• The word 'Polymer' is a Greek word. Here 'Poly' means 'many', 'Mers' means 'small units'.
• The artificial silk which is obtained by the chemical treatment of wood pulp is Rayon. It is similar to silk fiber.
• Thermoplastics have linear arrangments of molecules.
• Some characteristics of synthetic fibers - They are light and can be carried by anyone.  They are poor conductors of electricity.

Answer 2

Answer:

1. Monomer.

2.Silk worms and wool pulps.

3. Thermoplastic.

4. Air and water.

5. Lighter.

6. Teflon.

7. Reduce, Recycle, Refuse, Reuse, Repurpose.