Question

how do you differentiate between physical and chemical changes​

Answer 1

Answer:

The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

Explanation:

Answer 2

Answer:

The changes which can be reverse is known as physical change . As - melting of ice

The liquid obtained by melting of ice can be again change into ice by freezing .

While the changes which can't be reverse is known as chemical changes. As- Burning of paper - The ashes can't be again change into paper.