The burning of a candle is a chemical change whereas the melting of a candle is a physical change. Why?

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Solution

Physical change
The changes which can be observed and specified like changes in hardness, rigidity, fluidity, color, density, boiling point, melting point, etc. are the physical changes.
Chemical change
A chemical change is a change that results in the formation of new chemical substances.
It involves the making or breaking of bonds between atoms.
Burning of candle
When a candle burns, the oxygen in the air reacts, formation of carbon dioxide takes place.
Hence burning of candles is a chemical change.
Melting of a candle
Candle wax melts when it is heated. When it cools, it transforms back into solid wax.
The melting of a candle is physical change as no new product is formed.

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