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Examine the diagram depicting activation energy and threshold energy for reactions that release or absorb heat.

1. Threshold energy is greater in heat-releasing reactions.
2. Threshold energy is greater in heat-absorbing reactions.
3. Activation energy is greater in heat-releasing reactions.
4. Activation energy is greater in heat-absorbing reactions.

Correct answer: Activation energy is greater in heat-absorbing reactions.

Solution

In endothermic reactions, the energy required to reach the transition state (activation energy) is higher because the products have more energy than the reactants. This is not the case for exothermic reactions.

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