Question

what is physical and chemical change

Answer 1

There are several differences between a physical and chemical change in matter or substances. A physical 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 - those changes in which no new substance are formed are called physical changes
example - freezing of water

chemical changes - those changes in which new substance are formed are called chemical changes
example-burning of paper