If the forward reaction is exothermic, the reverse is endothermic.

Name: If the forward reaction is exothermic, the reverse is endothermic.
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Quizplus · Accepted Answer

This is because the energy change of a reaction remains the same regardless of the direction it occurs. So, if the forward reaction releases heat energy (exothermic), the reverse reaction must absorb heat energy (endothermic) to produce the same energy change.

If the Forward Reaction Is Exothermic, the Reverse Is Endothermic