Chemistry Test Chemical Equilibrium 2

Question 1

The reaction quotient Q is used primarily to:

Accepted Answer

Predict the direction a reaction will shift to reach equilibrium

Answer

Calculate the activation energy of a reaction

Answer

Determine the rate constant at a given temperature

Answer

Measure the enthalpy change of a reaction

Question 2

If Q > Kc for a reaction, which direction will the reaction shift to reach equilibrium?

Accepted Answer

To the left, producing more reactants

Answer

To the right, producing more products

Answer

The system is already at equilibrium

Answer

The reaction will stop

Question 3

According to Le Chatelier's Principle, increasing the pressure on the equilibrium N₂(g) + 3H₂(g) ⇌ 2NH₃(g) will:

Accepted Answer

Shift equilibrium to the right toward NH₃

Answer

Shift equilibrium to the left toward N₂ and H₂

Answer

Have no effect because Kc doesn't change

Answer

Decrease the temperature of the system

Question 4

For the exothermic reaction: N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + heat, increasing the temperature will:

Accepted Answer

Decrease Kc and shift equilibrium toward reactants

Answer

Increase Kc and shift equilibrium toward products

Answer

Increase Kc but not shift the equilibrium

Answer

Have no effect on Kc

Question 5

Adding an inert (noble) gas at constant volume to a gaseous equilibrium system will:

Accepted Answer

Not affect the equilibrium position

Answer

Shift the equilibrium toward the side with more moles of gas

Answer

Shift the equilibrium toward the side with fewer moles of gas

Answer

Always increase Kp

Question 6

For the endothermic dissolution: KNO₃(s) ⇌ K⁺(aq) + NO₃⁻(aq), what happens to the solubility of KNO₃ as temperature increases?

Accepted Answer

Solubility increases because the endothermic process is favored by heat

Answer

Solubility decreases because more energy disrupts the solution

Answer

Solubility remains unchanged since Ksp is constant

Answer

Solubility first increases then decreases

Question 7

Which change to the system PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) will NOT shift the equilibrium position?

Accepted Answer

Adding a platinum catalyst

Answer

Adding more PCl₅(g)

Answer

Removing Cl₂(g)

Answer

Decreasing the volume of the container