State four differences between physical and chemical changes.

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Solution

Physical change
Chemical change
1. No new substances with new properties are formed.
1. New substance with new properties are formed.
2. It can be reversed by simple physical methods.
2. Change cannot be reversed by simple physical methods.
3. It is temporary change.
3. It is permanent change.
4. Energy is neither needed nor produced.
4. Energy is either needed or evolved.

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Physical change	Chemical change
1. No new substances with new properties are formed.	1. New substance with new properties are formed.
2. It can be reversed by simple physical methods.	2. Change cannot be reversed by simple physical methods.
3. It is temporary change.	3. It is permanent change.
4. Energy is neither needed nor produced.	4. Energy is either needed or evolved.