Question 1

Refer to the reaction energy diagram provided. Which point on the diagram represents the transition state of the rate-determining step?

Accepted Answer

Point C

Question 2

Based on the reaction energy diagram, how many elementary steps are present in the reaction mechanism?

Accepted Answer

3

Question 3

Which segment of the reaction pathway (A to B, B to C, or C to D) corresponds to the step with the highest activation energy?

Accepted Answer

B to C

Question 4

If a catalyst is added to this reaction, which of the following changes would you expect to see in the energy diagram?

Accepted Answer

The activation energy for the highest peak will decrease.

Question 5

What does the difference in potential energy between point A and point D represent in the reaction energy diagram?

Accepted Answer

The enthalpy change ($$\Delta H) of $$the reaction

Question 6

Which point on the diagram most likely represents a reaction intermediate?

Accepted Answer

B

Question 7

If the reaction shown is exothermic, which of the following is true about the relative energies of A and D?

Accepted Answer

A is higher in energy than D

Question 8

Suppose the step from B to C is the slowest step in the mechanism. What is this step called?

Accepted Answer

The rate-determining step

Question 9

If the activation energy for the first step (A to B) is lowered, what effect will this have on the overall reaction rate?

Accepted Answer

The overall reaction rate will increase only if the first step is rate-determining.

Question 10

Which of the following best describes the energy difference between points B and C?

Accepted Answer

The activation energy for the second step

Analyzing Reaction Mechanisms Using Energy Diagrams

Study Guide - Practice Questions