Question 1

Which of the following best describes what is happening in the series of test tubes shown in the image, in the context of chemical equilibrium?

Accepted Answer

The color change shows the system reaching a dynamic equilibrium, where the concentrations of reactants and products become constant over time.

Question 2

In the context of the reaction $$\mathrm{N_2O_4(g) \rightleftharpoons 2 NO_2$(g)}$$, what does the increasing intensity of the orange-brown color in the test tubes represent?

Accepted Answer

An increase in the concentration of $$\mathrm{NO_2$(g)}$$

Question 3

If the system in the image is a closed system and the color stops changing after some time, what can you conclude about the rates of the forward and reverse reactions?

Accepted Answer

The rates of the forward and reverse reactions are equal.

Question 4

Suppose the temperature of the system shown in the image is increased. Predict what would happen to the color intensity and explain why.

Accepted Answer

The color would become darker because the endothermic reaction is favored, producing more $$\mathrm{NO_2$(g)}.$$

Question 5

If the volume of the container holding the equilibrium mixture is decreased, what will happen to the equilibrium position for the reaction $$\mathrm{N_2O_4(g) \rightleftharpoons 2 NO_2$(g)}$$?

Accepted Answer

The equilibrium will shift to the left, producing more $$\mathrm{N_2O_4(g)}.$$

Question 6

Which of the following best explains why the color in the test tubes eventually stops changing, even though the reaction is reversible?

Accepted Answer

The rates of the forward and reverse reactions are equal, so the concentrations of reactants and products remain constant.

Question 7

If additional $$\mathrm{NO_2$(g)} is $$injected into the equilibrium system shown in the image, what will happen to the color and the equilibrium position?

Accepted Answer

The color will become lighter as the system shifts left to produce more $$\mathrm{N_2O_4(g)}.$$

Question 8

Which of the following is a correct representation of the equilibrium constant expression for the reaction $$\mathrm{N_2O_4(g) \rightleftharpoons 2 NO_2$(g)}$$?

Accepted Answer

$$K_c = \frac{[NO_2$]^2}{[N_2O_4]}$$

Question 9

Which real-world scenario is most similar to the chemical equilibrium demonstrated in the image?

Accepted Answer

A sealed soda bottle where the amount of dissolved carbon dioxide remains constant over time.

Lesson 7.1: Chemical Equilibrium: Dynamic Equilibrium and ICE Table Calculations (12 Chem)

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