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All combustion reactions are exothermic; that is, they release heat to their surroundings. The reason for this: a certain amount of energy is released when the chemical bonds holding the fuel together break. Some of this energy is used to form the products of combustion, which are generally water vapor and carbon dioxide. However, this recombination doesn't use up all of the energy, so the excess gets passed along to the environment, which registers as a release of heat and light.

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