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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.
How is an endothermic phase change different from an exothermic phase change? An endothermic phase change is when the substance absorbs energy from its surroundings (melting, vaporization). In an exothermic phase change the substance releases energy tâ¦o its surroundings (freezing, condensation)..