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Exothermic Reaction: When methane gas is combusted, heat is released , making the reaction exothermic. Specifically, the combustion of 1 mol of methane releases 890.4 kilojoules of heat energy. Exothermic Reaction is a chemical reaction that releases energy in the form of heat to its surroundings. Common examples of exothermic reactions include combustion reactions , where substances burn and produce heat as a byproduct, such as the burning of wood or the combustion of gasoline in an engine. What is Exothermic Reaction in Chemistry? An exothermic reaction refers to a chemical process in which energy, usually as heat, is released into the surroundings . This means the products of the reaction have less energy than the reactants. Learn what an exothermic reaction is and see examples of common and simple reactions that release heat. Find out how to write and identify exothermic reactions and processes in chemistry and physics.