Question 1

For the equilibrium reaction $$\mathrm{N_2O_4(g) \rightleftharpoons 2NO_2(g)}$$, what will happen to the equilibrium position if more $$\mathrm{NO_2$(g)} is $$added to the system?

Accepted Answer

The equilibrium will shift to the left, favoring the formation of $$\mathrm{N_2O_4(g)}.$$

Question 2

Consider the reaction $$\mathrm{$$CaCO_3$$(s) \rightleftharpoons CaO(s) + CO_2$(g)}. $$What effect does adding more $$\mathrm{CaO(s)}$$ have on the equilibrium?

Accepted Answer

No change; the equilibrium position remains the same.

Question 3

For the reaction $$\mathrm{N_2$(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}$$, what happens to the equilibrium if the volume of the container is decreased at constant temperature?

Accepted Answer

The equilibrium shifts to the right, favoring $$\mathrm{NH_3$(g)}$$ formation.

Question 4

Which of the following changes will increase the partial pressure of $$\mathrm{N_2O_4(g)} in $$the equilibrium $$\mathrm{N_2O_4(g) \rightleftharpoons 2NO_2(g)}$$?

Accepted Answer

Add more $$\mathrm{NO_2$(g)}$$ and compress the container.

Question 5

For the exothermic reaction $$\mathrm{A + B \rightleftharpoons C + D + heat}$$, what is the effect of increasing the temperature?

Accepted Answer

The equilibrium shifts to the left, favoring reactants.

Question 6

Given the reaction $$\mathrm{CO(g) + 3H_2(g) \rightleftharpoons CH_4$(g) + H_2O(g)}$$ with $$\Delta H = -206.2\ \mathrm{kJ\ $$mol^{-1}$$}$$, how does the equilibrium constant $$K$$ change as temperature increases?

Accepted Answer

The equilibrium constant $$K$$ decreases.

Question 7

For the endothermic reaction $$\mathrm{N_2O_4(g) + heat \rightleftharpoons 2NO_2(g)}$$, what will happen to the equilibrium position if the temperature is increased?

Accepted Answer

The equilibrium shifts to the right, favoring $$\mathrm{NO_2$(g)}.$$

Question 8

If an inert gas is added to a reaction vessel at constant volume, what is the effect on the equilibrium position of a gaseous reaction?

Accepted Answer

No effect; the equilibrium position remains unchanged.

Question 9

For the reaction $$\mathrm{N_2$(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}$$, which of the following will increase the concentration of $$\mathrm{NH_3$(g)} at $$equilibrium?

Accepted Answer

Increase pressure (decrease volume) and decrease temperature.

Question 10

Which statement best describes Le Chatelier's Principle?

Accepted Answer

If a system at equilibrium is disturbed, it will shift in the direction that counteracts the disturbance.

Question 11

For the equilibrium $$\mathrm{N_2$(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}$$, what is the effect of increasing the volume of the container at constant temperature?

Accepted Answer

The equilibrium shifts to the left, favoring $$\mathrm{N_2$(g)}$$ and $$\mathrm{H_2$(g)}.$$

Question 12

Consider the equilibrium $$\mathrm{$$PCl_5$$(g) \rightleftharpoons $$PCl_3$$(g) + Cl_2$(g)}$$ with $$\Delta H = +89.7\ \mathrm{kJ\ $$mol^{-1}$$}. $$What is the effect of increasing temperature?

Accepted Answer

The equilibrium shifts to the right, favoring $$\mathrm{$$PCl_3$$(g)}$$ and $$\mathrm{Cl_2$(g)}.$$

Question 13

For the reaction $$\mathrm{N_2O_4(g) \rightleftharpoons 2NO_2(g)}$$, what happens if the volume of the container is increased?

Accepted Answer

The equilibrium shifts to the right, favoring $$\mathrm{NO_2$(g)}.$$

Question 14

Which of the following will NOT affect the equilibrium position of a reaction?

Accepted Answer

Adding an inert gas at constant volume.

Question 15

For the reaction $$\mathrm{CO(g) + 3H_2(g) \rightleftharpoons CH_4$(g) + H_2O(g)}$$, which of the following will increase the yield of $$\mathrm{CH_4$(g)}$$?

Accepted Answer

Decrease temperature and increase pressure.

Question 16

A reaction at equilibrium has equal moles of gas on both sides. What is the effect of changing the volume of the container?

Accepted Answer

No effect; the equilibrium position remains unchanged.

Question 17

For the reaction $$\mathrm{N_2$(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}$$, which of the following will decrease the concentration of $$\mathrm{NH_3$(g)} at $$equilibrium?

Accepted Answer

Increase temperature and increase volume.

Question 18

For the equilibrium $$\mathrm{N_2O_4(g) \rightleftharpoons 2NO_2(g)}$$, which of the following will increase the concentration of $$\mathrm{NO_2$(g)}$$?

Accepted Answer

Increase temperature and increase volume.

Chemical Equilibrium and Le Châtelier’s Principle: Effects of Concentration, Volume, and Temperature

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