chemical reaction

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noun

Chemistry. reaction(def 7).

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British Dictionary definitions for chemical reaction

chemical reaction

noun

a process that involves changes in the structure and energy content of atoms, molecules, or ions but not their nuclei Compare nuclear reaction

Cultural definitions for chemical reaction

chemical reaction

A process in which atoms of the same or different elements rearrange themselves to form a new substance. While they do so, they either absorb heat or give it off.