Question

When a candle burns, both physical and chemical changes take place. Identify these changes
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Answer 1

Answer:

When a candle burns, both physical & chemical changes occur. On heating, candle wax melts and form liquid wax. It is a physical change. Since it again turns into solid wax on cooling. This is a reversible change. When a candle is burnt in air, the mass of the product is increased due to atmospheric oxygen which show a that it is a chemical change.

Answer 2

Explanation:

When a candle burns, both physical and chemical changes take place.

Physical change → Melting of wax

Chemical change → Burning of wax

Eating of food is another example where both physical and chemical changes occur simultaneously.

Physical change → Breaking down of larger food particles into smaller particles

Chemical change → Digestion of food