Question

12. Differentiate between physical and chemical change?​

Answer 1

meaning

In a physical change, the molecules are rearranged while their actual composition remains same.

In a chemical change, the molecular composition of a substance completely changes and a new substance is formed.

Examples

Some example of physical change are freezing of water, melting of wax, boiling of water, etc.

A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

Answer 2

Answer :

Difference between physical and chemical change

Physical change

1. A physical change brings about changes in physical properties of the substance. Such as physical state shape and size.
2. There is no change in chemical composition of substance.
3. No new substance is formed.
4. Physical changes are temporary.
5. Physical changes are reversible.

Chemical change

1. A chemical change brings about change in the chemical properties of the substance.
2. There is always a change in the chemical composition of a substance.
3. A new substance is formed.
4. Chemical changes are prement.
5. Chemical changes are irreversible.