8. Classify the following into physical and chemical changes.
(a) The melting of ice
(b) Respiration
(c) The cooking of food
(d) Fermentation
(e) The evaporation of a liquid
(f) The sublimation of iodine
(g) The dissolving of a solid
(h) The burning of coal
(i) The glowing of a bulb
(j) The freezing of water
(k) The curdling of milk
(1) Photosynthesis in green plants
(m) The condensation of water vapour
(n) The digestion of food
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Answer:
Physical Changes: the melting of ice , the evaporation of liquid, the sublimation of iodine , freezing of water ,the condensation of water vapour and except of these are 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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