When the wax melts
Physical change.
burning of candle
An example would be the flame causing the wax to melt.
Melting is the physical change.
It is a physical change because when it melts it is still a candle just a melted one
This is because a candle will change its whole form and stay that way, which is a physical outer change. And a candle wick only burns, it doesn't change it's appearance.
because of the digestions system of the candle is visible
It is a chemical change.
The wax of the candle melts and then rehardens. This is a physical change and reversible
Burning a candle is a chemical change. It cannot be "unburnt"
Physical change means change physically while chemical change means change chemically or change in chemical properties.Like if you would drop a chip of zinc in sulphuric acid it will its color will be changed which is no doubt a physical change.But,also its properties are changed as it will be transformed into zinc sulphate from simple zinc,thus it also undergoes a chemical change. Now,with your question,the candle breaks but the candle remains the candle,so,its not a chemical change but a physical change only.Hope it helps!
1. Melting of the candle is a physical change. 2. Burning and thermal decomposition are chemical changes.