LeChatelier's Principle - B

Ammonia is produced commercially by the Haber reaction: N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g) + heat. The formation of ammonia is favored by what?

• an increase in pressure

• a decrease in pressure

• removal of N₂(g)

• removal of H₂(g)

Given the reaction at equilibrium: 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) + heat. Which change will shift the equilibrium to the right?

• increasing the temperature

• increasing the pressure

• decreasing the amount of SO₂(g)

• decreasing the amount of O₂(g)

Given the system at equilibrium: H₂(g) + F₂(g) ⇌ 2 HF(g) + heat. Which change at the equilibrium point of equilibrium will not shift the equilibrium?

• changing the pressure

• changing the temperature

• changing the concentration of H₂(g)

• changing the concentration of HF(g)

The concentration of SO₃(g) may be increased by what, given the reaction at equilibrium: 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) + heat?

• decreasing the concentration of SO₂(g)

• decreasing the concentration of O₂(g)

• increasing the pressure

• increasing the temperature

Given the reaction at equilibrium: 4 HCl(g) + O₂(g) ⇌ 2 Cl₂(g) + 2 H₂O(g). If the pressure on the system is increased, the concentration of Cl₂(g) will what?

• decrease

• increase

• remain the same

Given the closed system at equilibrium: CO₂(g) ⇌ CO₂(aq). As the pressure on the system increases, the solubility of the CO₂(g) will what?

• decreases

• increases

• remains the same

Given the reaction: N₂(g) + O₂(g) + 182.6 kJ ⇌ 2 NO(g) Which change would cause an immediate increase in the rate of the forward reaction?

• increasing the concentration of NO(g)

• increasing the concentration of N₂(g)

• decreasing the reaction temperature

• decreasing the reaction pressure

Given the equilibrium reaction: 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) + Heat. When the pressure on the system in increased, the concentration of the SO₃ will what?

• decrease

• increase

• remain the same

Given the equilibrium reaction: N₂(g) + O₂(g) ⇌ 2 NO(g). An increase in pressure produced by a decrease in volume at constant temperature would produce an increase in the concentration of what?

• N₂ only

• O₂ only

• N₂ and O₂ only

• N₂, O₂, and NO

Which system at equilibrium will be least affected by a change in pressure?

• 3 H2(g) + N2(g) ⇌ 2 NH3(g)

• 2 S(s) + 3 O2(g) ⇌ 2 SO3(g)

• AgCl(s) ⇌ Ag+(aq) + Cl−(aq)

• 2 HgO(s) ⇌ 2 Hg(g) + O2(g)