4.Name the type of Synthetic fibres used in:
(a)Parachute ropes
(b)Carpets
(c)Clothes
(d) sweaters and shawls
5.Write the difference between thermoplastic and thermosetting plastics with 2 examples
each
6.Differentiate between Biodegradable and Non-Biodegradable materials with examples.
7.Name the plastic used in
(a)Non-stick cookware
(b)Handles of cookware
(c) Fire-proof jackets
8. Explain the need to reduce the use of Plastics
Answers
Explanation:
Q5 The primary physical difference is that thermoplastics can be remelted back into a liquid, whereas thermoset plastics always remain in a permanent solid state. Think of thermoplastics as butter – butter can be melted and cooled multiple times to form various shapes.
Q6 Following are the key differences between biodegradable and non-biodegradable substances: ... Examples of biodegradable substances are dead plants and animals, their waste, fruits, vegetables, flower, paper, etc., while non-biodegradable substances include chemicals, paints, plastic, rubber, toxic, plastic, metals, etc
Q7 Bakelite
Q8 Reducing plastic waste is important because plastic production requires an enormous amount of energy and resources. This causes carbon emissions and contributes to global warming. Recycling plastic is not efficient – only 9% of plastic ever produced has been recycled. About 60% is discarded in landfills and oceans.