Question

Name the following:
(a) the process by which glass is cooled and made tougher
(b) gas given off when PVC is burnt
(c) large molecules made by joining many small molecules together
(d) substances that are easy to mould and can regain their shape
(e) fabrics made by the combination of natural and synthetic fibres
(f) two fabrics made from petroleum products

Answer 1

(a) Annealing is the process by which glass is cooled and made tougher.

(b) Hydrogen chloride gas is given off when PVC is burnt.

(c) Polymers are large molecules made by joining many small molecules.

(d) Thermoplastics are easy to mould and they can regain their shape.

(e) Blended fabrics are made by the combination of natural and synthetic fibres.

(f) Polyester fibres like dacron and terene are made from petroleum products.