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For questions relating to the energy required for or produced by reactions, including questions of endothermicity/exothermicity, bond enthalpy, etc.

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Why are some reactions exothermic and some are endothermic?

If you go from reactants to more stable products, the reaction may be exothermic by releasing the energy difference between the two species. … It's also possible to play on some effects such as the solvent to stabilize (higher energy) or destabilize (lower energy) the system. …
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