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AP Chemistry
5.11 Catalysis
5.6 Reaction Energy Profile
IntermediateMCQConceptual16.1k
Potential energy profiles for the uncatalyzed and catalyzed pathways of \(\text{X}_2\text{(g)} + \text{Y}_2\text{(g)} \rightarrow 2\text{XY(g)}\).
Potential energy profiles for the uncatalyzed and catalyzed pathways of \(\text{X}_2\text{(g)} + \text{Y}_2\text{(g)} \rightarrow 2\text{XY(g)}\).
The potential energy profile for an exothermic gaseous reaction is shown in the diagram below.

\[ \text{X}_2\text{(g)} + \text{Y}_2\text{(g)} \rightarrow 2\text{XY(g)} \]

A student proposes adding a suitable catalyst to increase the rate of formation of \(\text{XY(g)}\). Which of the following correctly predicts the effect of the catalyst on the activation energy of the reverse reaction, \(E_{a,\text{rev}}\), and the overall enthalpy change of the reaction, \(\Delta H\)?

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