Explain the differences between physical and chemical change.

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Solution

Physical change: A change that alters the physical appearance of a substance is known as physical change.
Chemical change: A change that changes the chemical composition of a substance in known as chemical change.
S.No. Physical change Chemical change
1 It is a temporary change. A chemical change is a permanent change.
2 It only alters the physical properties like shape, size, etc. It alters both physical and chemical properties.
3 A physical change involves very little to no absorption of energy. During a chemical reaction, absorption or evolution of energy take place.
4 In a physical change, no new substance is formed. One or more new substances are formed.
5 Example - freezing of water, melting of wax, boiling of water, etc. Example - digestion of food, burning of coal, rusting, etc.

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Give two differences between a physical change and a chemical change.

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S.No.	Physical change	Chemical change
1	It is a temporary change.	A chemical change is a permanent change.
2	It only alters the physical properties like shape, size, etc.	It alters both physical and chemical properties.
3	A physical change involves very little to no absorption of energy.	During a chemical reaction, absorption or evolution of energy take place.
4	In a physical change, no new substance is formed.	One or more new substances are formed.
5	Example - freezing of water, melting of wax, boiling of water, etc.	Example - digestion of food, burning of coal, rusting, etc.