Question 1

Which of the following statements best describes the transition state in a reaction coordinate diagram?

Accepted Answer

It is the highest energy point along the reaction pathway where bonds are partially broken and partially formed.

Question 2

Given the reaction $$\mathrm{A} + \mathrm{B} \rightleftharpoons \mathrm{C} + \mathrm{D}$$, which equation correctly represents the equilibrium constant $$K_{eq}$$?

Accepted Answer

$$K_{eq} = \frac{[C][D]}{[A][B]}$$

Question 3

Which of the following changes will increase the rate of a chemical reaction according to the Arrhenius equation $$k = Ae$$^{-E_a/RT}$$?

Accepted Answer

Increasing the temperature

Question 4

A reaction has $$\Delta H^\circ  0. $$What can be said about the spontaneity of this reaction under standard conditions?

Accepted Answer

The reaction is always spontaneous.

Question 5

Which of the following best explains why a catalyst increases the rate of a chemical reaction?

Accepted Answer

It lowers the activation energy $$E_a$$ required for the reaction.

Question 6

If a reaction has $$K_{eq} \u003e 1$$ and $$\Delta G^\circ \u003c 0$$, which of the following is true?

Accepted Answer

The reaction favors the formation of products at equilibrium.

Question 7

Which scenario below would result in a positive entropy change ($$\Delta S^\circ \u003e 0$$)?

Accepted Answer

One molecule decomposes into two molecules, one of which is a gas.

Question 8

Which of the following is true about the relationship between $$\Delta G^\circ$$ and $$K_{eq}$$?

Accepted Answer

$$\Delta G^\circ is $$negative when $$K_{eq} \u003e 1$$

Question 9

A reaction is described as exergonic. Which of the following statements is correct?

Accepted Answer

The reaction releases more energy than it absorbs.

Question 10

Which of the following best describes the effect of increasing the concentration of reactants on the rate of a reaction?

Accepted Answer

It increases the rate by increasing the frequency of effective collisions.

Question 11

Which of the following is NOT a way to make a reaction more product-favored?

Accepted Answer

Adding a catalyst to lower the activation energy.

Question 12

Which of the following statements about activation energy ($$E_a) is $$correct?

Accepted Answer

A lower activation energy means the reaction will proceed faster.

Question 13

In a reaction coordinate diagram, what does the difference in free energy between reactants and products represent?

Accepted Answer

The standard free energy change ($$\Delta G^\circ)$$

Question 14

Which of the following reactions is entropically neutral ($$\Delta S^\circ \approx 0$$)?

Accepted Answer

A reaction where the number of molecules on both sides is the same.

Question 15

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

It decreases the activation energy and increases the rate, but does not change the equilibrium constant.

Question 16

Which of the following is true for a reaction with $$\Delta G^\circ \u003e 0$$?

Accepted Answer

The reaction is endergonic and reactant-favored.

Question 17

Which of the following is a correct interpretation of Le Châtelier’s principle?

Accepted Answer

If a system at equilibrium is disturbed, it will shift to minimize the disturbance.

Question 18

Which of the following best explains why increasing surface area increases the rate of a reaction?

Accepted Answer

It increases the number of effective collisions between reactant molecules.

Question 19

Which of the following is true about the relationship between enthalpy ($$\Delta H^\circ) $$and bond strength?

Accepted Answer

Heat is released when bonds are formed and consumed when bonds are broken.

Question 20

A reaction has a large positive $$\Delta G^\circ$$ and a small activation energy ($$E_a). $$Which of the following best describes this reaction?

Accepted Answer

It is fast but reactant-favored.

Thermodynamics and Kinetics of Biological Reactions: Reaction Coordinate Diagrams, Energy Changes, and Reaction Rates

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