Question

13-Write down the four differences between physical and chemical changes.

Answer 1

Physical. Chemical.
1 Reversible. 1 Irreversible
2 Temporary. 2 Permanent
3 No change in 3 Change in
chemical. Chemical
composition. Composition
4 No catalyst. 4 Catalyst required
required

Answer 2

Physical changes are temporary changes. They are reversible changes. They affect the physical properties of the substance. No new substance is formed.
Chemical changes are permanent changes. They are irreversible changes. They affect both physical and chemical properties of the substance. A new substance is formed.

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