Question

Write any two differences between a chemical change and a physical change.

Answer 1

The difference between a physical change and a chemical change
Physical change -
i. In a physical change, only the physical properties of a substance get changed and no new substance is formed.
ii. Physical changes are generally reversible.
Example - Melting of wax

Chemical change -
i. In a chemical change a new substance is formed whose composition and chemical properties are entirely different from that of the original substance.
ii. Chemical changes are always irreversible.
Example - Rusting of iron