Question

Burning of candle is a chemical change whereas melting of candle is physical change. Why?

Answer 1

Hey!

When a candle burns, the oxygen in the air reacts and forms carbon dioxide. A new substance, the CO2 is formed. So it is a chemical change.
When the candle melts, no new substance is formed and the molten wax can be again solidified and made into a candle.which means it is a reversible change.
So we can say the burning of a candle is both a chemical as well as a physical change.

Hope it helps...

Answer 2

Answer:

Explanation:When a candle burns, both physical & chemical changes occur. Physical Changes in Burning Candle: 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. Chemical Changes in Burning Candle: When you light the candle, the wax present near the wick will melt. Wick absorbs the liquid wax. The liquid wax vaporizes due the heat produced by the flame. This wax vapor near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapours, heat and light. This is an irreversible change.