Mr. Koepnick demonstrating the combustion of Methanol as an example of an exothermic reaction in Chemistry I. An exothermic reaction is one in which heat energy is released. Chemical bonds in the reactants are broken, and new bonds are formed in the products. These new bonds have less potential energy than the reactants, and the difference is released as heat. Combustion (burning) reactions are a common example of exothermic reactions. #BettPride #BettHighlight