Question

Define the following:-

(a) physical and chemical change

(b) reversible and irreversible change

Answer 1

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• In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not.

• However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.

• Reversible changes is made physically and can be undone or reversed.

• Irreversible changes is made chemically and can't be reversed into its original states.

Answer 2

Answer:

(a) Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

(b)Reversible changes - where a change is made physically and can be undone or reversed. For example: freezing water to make ice. Irreversible changes - where the change is made chemically and can't be reversed into its original states. For example: baking a cake.

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