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1. Why is polyester considered to be a good material for making the sails of ships?

2. Name the component fibres of polycot, Terry wool and cots wool?

3. Why polythene bags should not be thrown along with garbage?

4. What are synthetic fibres? How are they made?

5. Differentiate between thermoplastics and thermosetting plastics and give one example of each?

6. List and explain four properties of plastics? Give one use of plastics linked to each of these properties?

7. List three steps you can take to reduce the danger that plastic pose to the environment?

8. Describe any three major uses of nylon?

9. State advantages and disadvantages of synthetic fibres 1

10. Explain polymerization?​

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Answer:

  1. Polyester has for decades been the most commonly used sail fiber because it is strong, durable and relatively inexpensive.
  2. components of polycot are polyester and cotton are blended and terrywool are terryelne and wool . Cotwool are cotton and wool.
  3. Polythene bags should not be thrown along with garbage as they are non biodegradable and can mix with the soil but cannot decompose....these when eaten by animals like cows can choke them leading to death.... Also as they do not decompose they can mix with the soil leading to soil pollution.
  4. Synthetic fibers are made from small molecules synthesized polymers. The substances used to produce such fibres are extracted from raw materials such as chemicals based on petroleum or petrochemicals. Such materials are polymerized into a chemical that ties together two adjacent atoms of carbon.
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