3 (a). Classify the following as physical or chemical changes:
Burning of wood

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Solution

A change in which chemical properties of a substance change and the formation of new substance occurs is known as a chemical change.
Burning of wood is a chemical change as it involves the formation of ash (an entirely new substance) that is different from the wood along with heat and energy.

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Question 16

Classify the following processes into physical or chemical changes:

(i) Beating of aluminium metal to make aluminium foil.
(ii) Digestion of food.
(iii) Cutting of a log of wood into pieces.
(iv) Burning of crackers.

(B) Classify the following as physical or chemical change.

10) Burning of paper

Classify the following as physical change or chemical change.

Burning of wood

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