how do you differentiate between physical and chemical changes
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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.
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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.
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