Question

a reaction that releases energy as it occurs is classified as a(n) _________.
exothermic reaction
endothermic reaction
catalyzed reaction
oxidation-reduction reaction
decomposition reaction

Explanation:

• An exothermic reaction releases energy (usually in the form of heat) during the reaction.
• An endothermic reaction absorbs energy.
• A catalyzed reaction is one that uses a catalyst to speed up the reaction rate but doesn't directly relate to energy release.
• An oxidation - reduction reaction is about electron transfer.
• A decomposition reaction is about a compound breaking down into simpler substances.

Answer:

exothermic reaction