In any chemical reaction, bonds are either formed or broken. Since bonds are a form of energy, all reactions result in either the absorption or release of energy. Exergonic reactions are ones that release energy; these reactions will usually occur spontaneously since they do not require energy to occur. On the other hand, endergonic reactions absorb energy to form bonds, so they do not occur spontaneously. Instead, they occur only if energy is available to be used in the reaction.
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Jeanette
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