Which of the following are chemical changes?
(a) Growth of a plant
(b) Rusting of Iron
(c) Mixing of iron fillings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of a candle.
A chemical change is a change that brings a change in the chemical properties of matter and a new substance is formed.
Examples of chemical changes from the given list of changes are:
Rusting of iron, Cooking of food, Digestion of food, and Burning of a candle.