1. What are synthetic fibres ?
2. Why is rayon called regenerated fibre ?
3. All plastics and synthetic fibres have one common property, what is it?
4. Give any two disadvantages of synthetic fibres over natural fibres.
5. Name two thermoplastics.
6. From which plastic is thermocol made ? Is it thermosetting plastic ?
7. Why are plastic bottles used to store chemicals?
8. Why do pressure cookers have plastic handles ?
Answers
Answer:
Explanation:
1) Synthetic fibers are fibers made by humans through chemical synthesis, as opposed to natural fibers that are directly derived from living organisms. They are the result of extensive research by scientists to improve upon naturally occurring animal and plant fibers.
2) Rayon is known as regenerated fibre because it is manufactured from natural resources like cellulose present in wood pulp and short fibres.
3) Plastic is a material that can be moulded or formed into different shapes. All these materials have one co common property – they are made of polymers.
4) Disadvantages of Synthetic Fibres
Most fabrics made from synthetic fibres require careful ironing as they melt easily.
Most fabrics made from synthetic fibres absorb very little moisture. They become sticky when the body sweats, which makes them uncomfortable to wear in hot weather.
Most fabrics made from synthetic fibres catch fire very easily.
5) Some of the most common types of thermoplastic are polypropylene, polyethylene, polyvinylchloride, polystyrene, polyethylenetheraphthalate and polycarbonate.
6) Thermocol is a plastic. It's polystyrene. Polystyrene is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum.
7) Plastics are non-corrosive and non-reactive in nature. So they are used for storing chemicals in the laboratory. They are used for strong chemicals because they do not react with chemicals neither do they corrode.
8) Plastics is an insulator and the metal is conductors,so the metal below the plastic gets heated up ,when the cooker is over stove for cooking, so the handle is covered with plastic so that you can get to handle the cooker while cooking and without getting your hands burned.
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Answer:
1.Some fibres are called as synthetic fibers because these are manmade fibers prepared by using chemicals.
2.Rayon is known as regenerated fibre because it is manufactured from natural resources like cellulose present in wood pulp.
3. plastic and synthetic fibres have one common property that is they are made up of polymers.
4. •synthetic fibre burn rapidly than natural fibres.
•Prone to heat damage.
5. rayon and polyester are two type of thermoplastics
6. thermocol is made from polystyrene.
7. Plastics are non-corrosive and non-reactive in nature. So they are used for storing chemicals.
8. Plastics is an insulator and the metal is conductors,so the metal below the plastic gets heated up ,when the cooker is over stove for cooking, so the handle is covered with plastic so that you can get to handle the cooker while cooking and without getting your hands burned.
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