Synthetic Fibres and Plastics
Exercises
1. Explain why some fibres are called synthetic.
2. Mark () the correct answer.
Rayon is different from synthetic fibres because
(a) it has a silk like
appearance.
(b) it is obtained from wood pulp.
(c) its fibres can also be woven like those of natural fibres.
3. Fill in the blanks.
(a) Synthetic fibres are also called
fibres.
(b) Synthetic fibres are synthesised from raw material called
(c) Like synthetic fibres, plastic is also a
or
Answers
1.Some fibres are called as synthetic fibers because these are manmade fibers prepared by using chemicals. These are made of small units that join together to form long chains.
2.It is made from purified cellulose from wood pulp which is converted into soluble compound which is chemically solidified to form synthetic fiber. Because rayon is manufactured from naturally occurring polymers, it is considered a semi-synthetic fiber.
3.a) Synthetic fibres are also called man-made or artificial fibres.
b)Synthetic fibres are synthesised from raw material called petrochemicals.
c).....a)Synthetic fibres are also called artificial or manmade fibres. (b) Synthetic fibres are synthesised from raw material called petrochemicals. (c) Like synthetic fibres, plastic is also a polymer.
hope it helps you......