Can physical and chemical changes occur together ? Illustrate your answer.

Explanation

In some cases, physical and chemical changes occur together. One such example is burning of candle. The solid wax present in the candle first changes into liquid state and then into the vapour state. Both these changes are physical changes. The wax vapours then combine with oxygen of the air to form a mixture of carbon dioxide and water. This involves a chemical change. The unreacted wax vapours again change first to the liquid state and finally to the solid state. This interconversion of states is a physical change. Thus, burning of candle involves both physical and chemical changes.