Question

Write any two characteristic properties and two important uses of each of the followi
(a) Polythene
(b) Teflon
(c) Bakelite
(d) Melamine​

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

Explanation:

Polythene:-

1) It is water resistant.

2) It is strong but flexible and can be rolled into sheets and moulded into different shapes. Uses: Polythene sheets are used for the packaging of liquids such as milk.

Bakelite:-

Bakelite has a number of important properties. It can be molded very quickly, decreasing production time. Moldings are smooth, retain their shape and are resistant to heat, scratches, and destructive solvents. It is also resistant to electricity, and prized for its low conductivity.

Melamine:-

Answer: Melamine is highly stable and can resist high temperature exposure as well as physical and chemical degradation. Melamine is also a flame retardant and also possesses properties like hardness, scratch and moisture resistance.

Teflon:-

Teflon has the following properties: it is inert to the atmosphere and chemical substances. both water and oil do not stick to the teflon coated articles. it has a high melting point i.e. 327∘C which means there is no effect of high temperatures on it.

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