Question

Melting of wax is a physical change but burning of wax is a chemical change.Explain.​

Answer 1

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(✿)Melting of wax is a physical change but burning of wax is a chemical change.Explain.

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• Melting of wax changes the state of wax from solid to liquid. No new substance is formed. The chemical nature of solid wax and liquid wax is the same. Hence melting of wax is a physical change.

• Burning of wax gives new gaseous products. Hence burning of wax is a chemical change.

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Answer 2

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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