Physical Change:

Change in which only physical properties of a substance change and no new substance is formed is called Physical Change.

Most of the physical changes are reversible, this means we can get the substance back even after the change.

Examples:

Folding of a paper sheet: A paper can be folded or unfolded, and hence it is an example of physical change. Moreover, no new substance is formed in this process, so it is a physical change.

Tearing of paper sheet: Even after being torn in very small pieces; each piece is a piece of paper. Since no new substance is formed in this process, so it is a physical change.

CHEMICAL CHANGE

Changes in which chemical properties of substance change and a new substance is formed are called chemical changes. Some of the chemical changes are irreversible. Even in case of reversible changes in which chemical properties of substance change and a new substance is formed are called chemical changes. Some of the chemical changes are irreversible.

Examples:

Burning of paper, wood, fuel or anything:

When something is burnt, many new substances are formed; especially carbon dioxide is formed in most of the cases. Once something is burnt, the ash or carbon dioxide cannot be turned into the original substance. Hence, burning of anything is chemical and irreversible change.

Melting of wax and burning of wax are different kinds of change. Burning of wax is chemical change while melting of wax is a physical change. Burning of wax is irreversible while melting of wax is reversible.