Question

Uses of polythene, polystyrene, Teflon and backlight.
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Answer 1

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Characteristics of polythene are as follows:

1.have low strength

2.Its density: 0.88–0.96 g/cm cube

3.Polythene is of two types:high density and low density

Characteristics of polystyrene are as follows:

1.Polystyrene contains the toxic substances Styrene and Benzene.

2.High Impact Polystyrene (HIPS) is a versatile, economical and impact-resistant.

characteristics of Teflon are as follows:

1.It maintains high strength, toughness and self-lubrication at low temperatures.

2.Its melting point is 600 K, 327 °C.

3.Its density is 2200 kg/meter cube

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Answer 2

Answer:

(i) The monomer of polyvinyl chloride is CH 2 =CHCl

(vinyl chloride).

(ii) The monomer of teflon is CF 2 =CF 2

(tetrafluoroethylene).

(iii) The monomers involved in the formation of bakelite are HCHO (formaldehyde) and C 6 H5 OH (phenol).

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