Question

. Define physical changes with two examples.

Answer 1

Part-1: Definition:

• Physical change: A change that alters some specific property of matter without any change in the composition of its molecules is called a physical change.
• No new substances are formed during physical change.
• Physical changes can be generally reversed.
• There is no change in weight during physical change.
• Only a little heat is absorbed or given off during a physical change.

Part-2: Example:

1. Evaporation of water by the heat of the sun.
2. Magnetisation of iron.