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If energy is stored in chemical bonds, and bond formation is always an exothermic process, doesn't that imply that bond formation both stores and releases energy? How is this possible? I'm clearly not understanding some basic tenet of chemistry. For example, H+ and OH- neutralize to form H2O.
All Answers (16) 1  Reactions can be either exergonic (exothermic) or endergonic (endothermic) depending on the free energy difference (delta G) between substrates and products. In the case of the hydrolysis of ATP to ADP + inorganic phosphate under typical aqueous conditions, the reaction is exothermic, releasing energy. Conversely, the reverse reaction is endothermic. For a different reaction, the opposite may be true. It depends on what is reacting (and the conditions).