Classify the following processes into physical or chemical changes:
(i) Beating of aluminum metal to make aluminum foil.
(ii) Digestion of food.
(iii) Cutting of a log of wood into pieces.
(iv) Burning of crackers.
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i) Physical change
ii) Chemical change
iii) Physical change (The cutting of wood piece is a physical change. Cutting would give rise to a new wood piece in which no new substance is formed so its a physical change.)
iv) Chemical change
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Answer:
(a) Photosynthesis → Chemical change
(b) Dissolving sugar in water → Physical change
(c) Burning of coal → Chemical change
(d) Melting of wax → Physical change
(e) Beating aluminium to make aluminium foil → Physical change
(f) Digestion of food → Chemical change
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