Classify the following changes as physical or chemical
(i) Filling of LPG gas under pressure in gas cylinders
(ii) Cutting the wood
(iii) Rusting of an iron object
(iv) Burning of paper

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Solution

The above changes are classified as, Filling of LPG gas under pressure in gas cylinders Cutting the wood Rusting of an iron object Burning of paper

Physical change

Physical change

Chemical change

Chemical change

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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.

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) Rusting of iron.

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