Classify the two changes given below. Change I: Cutting a log of wood into pieces Change II: Burning a log of wood

Both are physical changes.

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Both are chemical changes.

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Chemical change and physical change

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Physical change and chemical change

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Solution

The correct option is D Physical change and chemical change
A physical change is a temporary change in which no new substance is formed and the chemical composition remains the same. A chemical change is a permanent change in which new substances are formed whose chemical composition and physical properties are different.

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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.

Burning of wood and cutting it into small pieces are considered as two different types of changes.

Cutting of wooden logs into small pieces and burning are considered as two different types of changes.

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