Burning is a chemical reaction in which a substance combines with ____. The substance that combines with oxygen is called a ____. Combustion is often a ____ reaction. When you burn a charcoal, the chemical energy in the fuel is changed to ____ and light energy. Sometimes you can hear the fire burning some of the chemical energy is changed to ____. Oxygen is present ____ of the air around us. When charcoal burns, oxygen and carbon atoms rearrange themselves, energy is given out and temperature ____. A chemical reaction in which energy is given out is called ____. Burning (combustion) is an ____ reaction. In a burning reaction there are energy ____.

Energy

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