Question

Question 11

State whether the following statements are true or false:

(a) When a candle burns, both physical and chemical changes take place.
(b) Anaerobic bacteria digest animal waste and produce biogas.
(c) Ships suffer a lot of damage though they are painted.
(d) Stretching of rubber band is not a physical change.

Answer 1

(a) True, the wax meting is a physical process, while combustion of wax is chemical process,
(b) True
(c) True, salty water of sea causes faster rusting of iron.
(d) False, stretching of rubber band is a physical change