Give reason for the following melting of wax is a physical change but burning of a candle is a chemical change.
Melting of wax is physical change.
In melting of wax, only the state of wax changes from solid to liquid.
It is a reversible reaction and no new substance is formed.
Burning of candle is both physical and chemical change.
When the candle burns, the wax slowly melts which freezes after some time (Physical change).
Burning of wick is a chemical change as it involves combustion.