Why do exothermic reactions release heat?

Exothermic reactions convert chemical energy (enthalpy) inside chemical substances into heat energy. The chemical energy decreases, and the heat energy increases (total energy is conserved). BOND MAKING RELEASES ENERGY, RATHER THAN NEEDING IT TO BE SUPPLIED, so as a result of the bond making, heat energy is released.Click to see full answer. Just so, do exothermic reactions release heat?Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light. In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.Similarly, why is energy released as heat? when converted to heat, increases the kinetic energy of molecules in the surroundings. This increase in kinetic energy raises the temperature and this is what we commonly percieve as heat. For instance, when carbon bonds break and form new bonds during the burning of fuel, a certain amount of heat energy is released. Herein, why do endothermic reactions absorb heat? Endothermic reactions absorb energy. As a result, more energy is needed to break the bonds in the reactants than is released during the formation of the products. The difference in energy is usually absorbed from the surroundings as heat. This often causes a decrease in the temperature of the reaction mixture.Why is heat released in a chemical reaction?All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Like the combustion reaction in a furnace, some chemical reactions require less energy to break bonds in reactants than is released when bonds form in products.