Definition of Exergonic Reaction

Exergonic reactions are such type of reactions which do not require outside energy to proceed. They are spontaneous and favourable. They release energy into their surroundings and hence the energy of the reactants is higher than that of the products. The chemical bonds that are formed in the reaction are typically stronger than that of the bonds that were broken down during it.


The disorder and randomness of the molecules are extensively increasing and hence the entropy of the system is increased. The free energy of the system is decreased and Gibbs free energy (G) is negative of these reactions. The examples include the reaction between sodium and chlorine to form table salt (NaCl), combustion, etc.

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