. 1. Give two examples each of natural and synthetic fibres. 2. What is a polymer? 3. Why is rayon called a regenerated fibre? 4. List two disadvantages of synthetic fibres. 5. What is a plastic? All plastics have one common property--what is it? 6. Why are plastic bottles commonly used to store chemicals in a chemistry laboratory?
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Q1 the example of natural fibre are silk and cotton .
the example of synthetic fibre are nylon terelene
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1. cotton silk
2. Polymers are materials made of long, repeating chains of molecules.
3. because the cellulose, obtained from soft woods or from the short fibres (linters) that adhere to cottonseeds, is converted to a liquid compound, squeezed through tiny holes in a device called a spinnerette, and then converted back to cellulose in the form of fibre.
4. water or sweat.
5. Plastic is defined as a material that contains as an essential ingredient an organic substance of large molecular weight.
6. because plastics are non-reactive.
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