Definition of Endergonic Reaction

Endergonic reactions are such type of reactions which require an input of energy. They are non-spontaneous and unfavourable as energy has to be supplied to them before the initiation of the reaction. They absorb the required energy from their surroundings and hence the energy of the products is higher than that of the reactants.


The bonds that are formed are typically weaker than those that were broken down during the reaction. The free energy of the system is increased and Gibbs free energy (G) is positive of these reactions. The examples of such reactions include the melting of ice into liquid water, photosynthesis, etc.

View More Organic Chemistry Definitions