what is an exothermic reaction example
Exothermic Reaction Examples. Exothermic chemical reactions release heat to the environment. Photo Credit: 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.