Question

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

Answer 1

Answer:

Physical changes in burning candle On heating, candle's wax melts, it is a physical change. Since, it again turns into solid wax on cooling. The change is reversible. Chemical changes in burning candle The wax near to flame burns and gives new substances like carbon dioxide, carbon soot, water vapours, heat and light.

Explanation:

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Answer 2

Physical changes on burning a candle:

• Candle wax melts and forms liquid wax.
• Since, it again turns into solid. This is reversible change.

Chemical changes on burning a candle:

• On lighting a candke, the wax present near the wick will melt.Wick absorbs the liquid wax.
• The liquid wax vapourises due to heat produced by flame.The wax vapor near flame burns and give rise to new substances like carbon dioxide, water vapours, heat and light. This is irreversible change.

Hence, the given reasons states that when a candle burns, both physical and chemical changes take place!!

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