Question

Classify the changes involved in the following processes as physical or
chemical changes:
(a) melting wax
(b)
beating aluminium to make aluminium foil
(c)
digestion of food​

Answer 1

Answer:

a, b are physical change and c is chemical change

Answer 2

Answer:

(a) melting wax : The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes.

(b) beating aluminium to make aluminium foil : Beating aluminium to make Aluminium foil is a physical change because with the beating, molding, heat pressing and fabrication process, people can develop their products or aluminium foils with the aluminium sheets.

(c) digestion of food : Digestion of food is an example of chemical change. Digestion is considered as chemical change because enzymes in the stomach and intestines break down large macro-molecules into simpler molecules so that the body can absorb the food easily.

Explanation:

hope it helps.