What changes you notice when you burn candle ? Discuss the reason of the shortening of candle .

Dear student, 
​Please find below the solution to the asked query        

Burning of candle involves both physical change and chemical change. Candle is made up of a solid block of wax with a wick embedded in it.

1) Physical Change

When 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 Change

The wax acts as a fuel when we light the candle and is basically a chemical substance called carbon. The carbon combines with oxygen to form another chemical substance called carbon dioxide. Also the unburnt carbon is deposited as black substance called soot. This signifies a chemical change.

Constant melting of wax results in shortening of candle.

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