Question

2. Define a physical and a chemical change. Give an example each​

Answer 1

Answer:

The change which is reversible is known as physical change.

example- freezing of water

The change which is irreversible is known as chemical change.

example-burning of paper

Answer 2

Answer:

Physical change is a type of change where the physical properties of matter change. A change of state of matter, change in colour, odour, solubility, etc. all are examples of physical change.

Physical changes only change the appearance of a substance, not its chemical composition.

Example :- Melting an ice cube.

A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed.

Example :- Burning of paper and log of wood