Question

Give an example of physical as well as chemical change.

Answer 1

Physical change:-

1. When the physical properties like shape, size, colour, state or appearance of the substance undergo a change, that type of change is called a physical change.
2. Although the chemical compositions remain the same.
3. Examples: melting of ice, boiling of water, condensation.

Chemical change:-

1. The change during which the chemical properties of a substance alter is called a chemical change.
2. Hence there is either formation of bonds or breaking of bonds due to this, at an atomic level.
3. Examples:- burning of paper, rusting of iron, cooking.

Burning of wood:-

1. The burning of wood is considered both a physical and a chemical change.
2. This burning of wood results in changing the moisture present in the wood to turn into water vapour, which is a physical change.
3. This burning also causes the emission of carbon dioxide$\left({\mathrm{CO}}_2\right)$which is a chemical change.

Therefore, the burning of wood is an example of physical as well as chemical change.