Question

Differentiate between physical and chemical change

Answer 1

There are several differences between a physical and chemical change in matter or substances. Aphysical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

Answer 2

Physical change :-

• Changes take place only in properties such as colour, physical state, density, etc.
• Change is temporary.
• Original substance can be obtained back easily.
• Chemical properties of the substance remain unchanged even after the change.
• Example :- Formation of cloud,Magnetising an iron bar etc.

Chemical change :-

• Change results in the formation of new chemical substances.
• Change is permanent.
• Original substance cannot bee obtained back easily.
• New substance with different properties are formed
• Example :- Burning of fuel, Digestion of food etc.