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A reaction in which energy is released to the surroundings is called an exothermic reaction. In this type of reaction the enthalpy, or stored chemical energy, is lower for the products than the reactants.
Exothermic Reaction Examples. Exothermic chemical reactions release heat to the environment. AITCH, Getty Images. An exothermic reaction is a chemical reaction that releases heat and has a negative enthalpy (-Î´H) and positive entropy (+Î´S).. These reactions are energetically favorable and often occur spontaneously, but sometimes you need a little extra energy to get them started.