Physical changes are changes in appearnce of substance , change of matter not change of chemical composition . It is reversible in nature. No new substance is formed.It is temporary change. No energy is generated.

example: melting of ice

Chemical changes cause a substance to change into an entirely substance with a new chemical formula.It is irreversible in nature. One or more new substances are formed.It is permanent change. Energy (heat, light,sound,etc) is generated.

example : burning of coal

• This reply was modified 3 months, 1 week ago by  Samidha Kunwar.