Question

Give the characteristic properties and important uses of the following (i). Polythene (ii). Polystyrene (iii). Teflon

Answer 1

Answer:

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

Answer 2

Answer:

1. polythene= It is water resistant. It is strong but flexible and can be rolled into sheets and moulded into different shapes.

uses of polythene=polythene sheets are used for the packaging of liquid such as milk

2. polystyrene =It can be easily moulded. It has poor chemical resistance.

uses of polystyrene =It is used for the packaging of delicate materials like electronic items