1. Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f) Digestion of food
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Photosynthesis is a chemical change (CO2+H2O----->C6H12O6+O2+heat)
Dissolving sugar in water is a physical change
Burning of coal is a chemical change (C+02------>CO2)
melting of wax is physical change
Beating aluminium to make aluminium foil is physical change
digestion of food is chemical change (there are many in different sites of the body)
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