AP Chemistry 5.10 Multistep Reaction Energy Profile Question Bank

Practise AP Chemistry 5.10 reaction-profile questions by relating mechanism steps, activation energies and the overall energy change.

Answer the following questions about $\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}$ .

(h) In the reverse reaction, the conversion of compound Z to compound X is catalyzed in the presence of trace amounts

of water. The catalyzed reaction is proposed to occur via the following two-step mechanism.

$Step 1: $\mathrm{Z}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Y}$ (slow)$

$Step 2: $\mathrm{Y} \rightarrow \mathrm{X}+\mathrm{H}_{2} \mathrm{O}$ (fast)$

ii. A reaction profile of the uncatalyzed reaction is shown above. On the same axes, sketch a reaction profile

consistent with the proposed mechanism for the catalyzed reaction.

(ii) A reaction profile of the uncatalyzed reaction is shown above. On the same axes, sketch a reaction profile consistent

with the proposed mechanism for the catalyzed reaction.

Part H(ii)

Select a point value to view scoring criteria, solutions, and/or examples and to score the response.

The response does not meet any of the following criteria.

The response shows the correct starting and ending points.

○ The curve begins and ends at the same energies as the original curve, with an initial activation

energy depicted.

The response shows a curve with the correct shape.

○ The curve should have two local maxima, with the first step having a larger $E_{a}$ than the second

step (and smaller than the $E_{a}$ of the uncatalyzed reaction).

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