Question

Classify the changes involved in the following process as physical and chemical changes and justify your answer -
a. Photosynthesis
b. Dissolving sugar in water
c. Melting of wax
d. Burning of coal
e. Beating aluminium to make aluminium foil
f. Digestion of food

Answer 1

A CHEMICAL B PHYSICAL C PHYSICAL D CHEMICAL E PHYSICAL F CHEMICAL

Answer 2

photosynthesis is a chemical change because glucose is formed with the help of sunlight co2 and water
sugar in water is also a physical change because the sugar is settle up between the gaps of water molecules and form a another new solution having higher viscosity but the composition become unchange
melting of wax is physical change because the actually changing his state and no new substance is formed
burning of coal is a chemical change because carbon react with oxygen while burning and form carbon dioxide
it is a physical change because new substance is formed but not in change the chemical composition of alluminium
digestion of food is chemical change because new substance is formed like proteins carbohydrates
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