Question

(a) Define
(i) a physical change
(ii) a chemical change​

Answer 1

Explanation:

Physical change- Physical changes only change the appearance of a substance, not its chemical composition.

Chemical change- Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

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Answer 2

Explanation:

• A physical change is a temporary change which can be

reversed.

• Properties of physical changes-

• Are only in the state of matter

• Are temporary, and

• Can be easily reversed

• In a chemical change, heating or cooling results in a

permanent change in the state of matter.

• Properties of chemical change-

• Are permanent

• Cannot be reversed

• Result in the formation of new substances.