Synthetic fibres and plastics Worksheet-3
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What is polyester?
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Name the fabric obtained by mixing polyester and cotton.
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How are synthetic fibres made?
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Name the plastic which is used for insulating electric wires.
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Name the plastic which is used for making pipes for insulating electric installations.
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What is the difference between thermosetting plastics and thermoplastics?
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Why are the chemicals in the laboratory stored in plastic containers?
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Can you store pickles in plastic containers? Why?
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Why are the electric wires covered with plastic?
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Which property of plastic makes it suitable to be used for making handles of frying pans?
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Why do we use plastic cookware in microwave ovens?
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What are biodegradable materials?
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What are non-biodegradable materials?
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Tin takes about 100 years to degenerate. Is it biodegradable or non-biodegradable?
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As a responsible citizen, what are the 4R's we should remember?
Answer:
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Polyester is a polymer consisting of repeating units of ester. Ester is a chemical compound.
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Polycot is obtained by mixing polyester and cotton.
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Petrochemicals are used for making synthetic fibres. The chemicals are polymerized under different conditions of temperature and pressure to make synthetic fibres.
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Polyethylene (polyethene ) is used for insulating electric wires.
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P.V.C (polyvinyl chloride ) is used for manufacturing pipes for insulating electric installations.
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Thermoplastic on heating gets softened and can be remoulded. For example: Polyethene, PVC
Thermosetting plastics do not soften on heating and once molded cannot be remolded.
For example: Bakelite, Melamine
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Plastics are inert materials. They do not react with air, water or chemicals.
Hence chemicals are stored in plastic bottles.
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Yes pickles can be stored in plastic containers because they are not corroded as they do not react with air and water.
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Plastics are poor conductors of electricity hence electric wires are covered with plastics.
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Plastics are poor conductors of heat hence it is used for making handles of frying pans.
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Polypropylene a kind of plastic which is used for making cookware for use in microwaves because of its high heat resistance. The food gets heated up but the cookware does not.
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The materials which can be decomposed by microorganisms are called biodegradable materials.
For example: Polymers like cellulose, starch, proteins are common examples of biopolymers which are biodegradable also.
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The materials which cannot be decomposed by microorganisms are called non-biodegradeble polymers. For example: Polyethene, PVC, Polystyrene etc
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Tin is not biodegradable material as it is a metal and is not decomposed by microorganisms.
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The 4R’s we should remember are Reduce, Reuse, Recycle, Recover.