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Light from the candle as chemical reaction which is known as combustion and the wax made of carbon based chemicals reacts with oxygen in the air to make a color change,

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While the candle is burning the chemical bonds & energy is released which then forms heat & light which it comes from the burning fuel and the light comes from fuel and the burning of the wick which is the string of the candle. Kinetic energy is released when the wax melts and rolls.

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As a candle burns the solid wax becomes a liquid and goes to evaporate to turn into a gas. The burning of the candle produces carbon is what we see when look at the black soot on the spoon.

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Potential energy is stored in chemical bonds and it gets released when its being burned but for not its being trapped so all it is energy being closed in.