Exergonic reactions are similar and different than endergonic reactions. The basic definitions most people remember about exergonic and endergonic reactions is exergonic refers to a reaction that gives off energy, while endergonic reactions take in energy. Although, there is more the energy. Both reactions require for an input of activation energy and use enzymes to lower the activation energy need to complete the reaction. Also the exergonic reactions have a negative value for the Gibb’s free energy value due to the reactants having greater free energy than the products. Endergonic reactions, however, are the opposite of exergonic reactions and have a positive Gibb’s free energy value because the products have more free energy than the reactants. Exergonic reactions are more favorable and spontaneous because of the negative value while endergonic reactions are less favorable and nonspontaneous.
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