Bond energy and whether a reaction releases or absorbs energy
Breaking a chemical bond requires energy, while forming a new bond releases energy, and whether a reaction overall releases or absorbs energy depends on which effect is bigger. A reaction that releases more energy forming new bonds than it used breaking old ones releases energy overall (exothermic), while one that uses more energy breaking bonds than it gets back absorbs energy overall (endothermic).
This explanation is AI-generated and can occasionally be wrong.
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