What is the difference between burning of a candle and burning of candle wax?
Why is the burning of a candle a physical change whereas burning of a candle wax a chemical change?
Burning of a candle is both a physical and a chemical change. Candle is made up of a solid block of wax with a wick embedded in it.1) Physical ChangeWhen candle is lit, the heat of the flame melts the solid wax to liquid wax. This signifies a physical change from solid state to liquid state.2) Chemical ChangeThe wax acts as a fuel when we light the candle and is basically carbon. The carbon combines with oxygen to form another chemical substance which is carbon dioxide. Also the unburnt carbon is deposited as black substance called soot. This signifies a chemical change.