Question 1

Which statement best describes chemical equilibrium in a reversible reaction?

Accepted Answer

The forward and reverse reaction rates are equal.

Question 2

In the reaction $A \rightleftharpoons B$, what does the double arrow indicate?

Accepted Answer

The reaction can proceed in both forward and reverse directions.

Question 3

Which of the following is NOT true about equilibrium concentrations in a chemical reaction?

Accepted Answer

The concentrations of reactants and products are always equal at equilibrium.

Question 4

A student observes a reaction where the concentration of reactant A decreases and product B increases until both concentrations level off. What has the reaction reached?

Accepted Answer

Equilibrium

Question 5

Which of the following best explains why most chemical reactions do not go to completion?

Accepted Answer

The reaction reaches a state where the forward and reverse rates are equal.

Question 6

Given the reaction $A \rightleftharpoons B$ with rate constants $k_1$ (forward) and $k_{-1}$ (reverse), which equation represents equilibrium?

Accepted Answer

$k_1 [A] = k_{-1} [B]$

Question 7

Which of the following is a characteristic of a dynamic equilibrium?

Accepted Answer

The forward and reverse reactions continue at equal rates.

Question 8

In a reversible reaction, what happens to the concentrations of reactants and products at equilibrium?

Accepted Answer

They remain constant.

Question 9

Which of the following statements about equilibrium is FALSE?

Accepted Answer

At equilibrium, the reaction has stopped.

Question 10

A medical chemist is studying a drug that undergoes a reversible reaction in the body. Why is it important to understand equilibrium in this context?

Accepted Answer

It helps predict the ratio of drug to metabolite at steady state.

Question 11

Which of the following best describes the graph shown for a reversible reaction?

Accepted Answer

Reactant concentration decreases and product concentration increases until both level off.

Question 12

If a reaction at equilibrium is disturbed by adding more reactant, what will happen according to Le Chatelier's Principle?

Accepted Answer

The system will shift to produce more product.

Question 13

Which of the following is true for a reaction that has reached equilibrium?

Accepted Answer

The rates of the forward and reverse reactions are equal.

Question 14

A student claims that at equilibrium, the reaction has stopped. Which statement best corrects this misconception?

Accepted Answer

At equilibrium, the reaction continues but the concentrations remain constant.

Question 15

Which of the following is NOT a feature of a reversible chemical reaction?

Accepted Answer

Reactants are completely converted to products.

Chemical Equilibrium and Reversible Reactions

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