What Are Exothermic Reactions?

In a chemical reaction, a reaction in which the total energy of the reactants is greater than the total energy of the products is called an exothermic reaction. Including combustion, neutralization, metal oxidation, aluminothermic reaction, the reaction of more active metals and acids, and the reaction from unstable substances to stable substances.

Combustion, neutralization, metal oxidation,

(1) All combustion or explosion reactions.

(2) Acid-base neutralization reaction.

(3) Most chemical reactions.

The nature of the chemical reaction is: the breaking of the old bond and the formation of a new bond, while the newly formed chemical bond is generally more stable than the old bond, the covalent electrons transition from a high energy level to a low energy level, releasing energy, and the breaking of the old bond requires absorption Energy, so whether the final chemical reaction is endothermic or exothermic depends on the difference between the energy changes before and after the reaction. If the energy is insufficient, it needs to absorb heat from the outside, otherwise it is exothermic. Usually we use enthalpy change ( H) to measure Thermal phenomenon. ^[3]