Chemistry Regents Practice Test 2025 – Complete Prep Resource

Question: 1 / 400

In which type of reaction does a catalyst not get consumed?

All chemical reactions

Only endothermic reactions

Only exothermic reactions

Catalytic reactions

A catalyst is a substance that accelerates a chemical reaction without being consumed or permanently altered in the process. This means it can participate in the reaction by providing an alternative pathway with a lower activation energy, but it remains unchanged once the reaction is complete.

In catalytic reactions, the catalyst facilitates the reaction but is not consumed, allowing it to be used repeatedly. This principle applies universally to all chemical reactions where a catalyst is involved, but the specific focus on 'catalytic reactions' emphasizes the role of the catalyst directly. Other types of reactions, including endothermic and exothermic reactions, can have catalysts, but it's not exclusive to them, making 'catalytic reactions' the most precise answer in this context.

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