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Photochemical reactions are chemical processes that are initiated or accelerated by the absorption of photons, usually in the ultraviolet or visible region of the electromagnetic spectrum. When a molecule absorbs light, it undergoes electronic excitation, moving from a ground state to an excited state with higher energy. These excited states have distinct chemical reactivities compared to the ground state, which allows reactions to occur that are ___ _______ _______ ___ _______ __________ _______ __________ ____.
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