A VERY SHORT-ANSWER QUESTIONS : Answer in one-word
1. What are the small molecules which make a chain-like molecule of a polymer called
2. Which two fibres are blended to obtain terycot ?
3. Which fibres are nonbiodegradable ?
4. Are the handle and bristles of a tooth brush made of the same material ?
5. Which type of plastics cannot be processed again and again?
10 15 words
Answers
1)
The small molecular units are called monomers (mono means one, or single), and they are linked together into long chains called polymers (poly means many.
2)Terycot is a blended febric made by combining terylene and cotton.
3) examples of synthetic fibres are rayon,nylon,polyester,acrylic etc so these are non biodegradable which can never be mixed with soil. one of the major fibre is plastic.it is a threat to the environment damaging it's beauty. plastic can never be mixed with soil. Sunthetic fibres are made with chemicals and toxic .
4) The handle and bristle of a toothbrush should not be made of the same material as the handle of the toothbrush should be hard and strong while the bristle should be soft and flexible.
5) Thermosetting plastics do not soften on heating and cannot be reshaped. They are often tough materials with high melting points. Bakelite is a thermosetting plastic.