Dynamic equilibrium and Le Chatelier's principle Quiz
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5 questions, one answer each
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1. Which statement is true of a reaction at dynamic equilibrium?
- A. The forward reaction has stopped
- B. The rates of the forward and reverse reactions are equal
- C. The concentrations of reactants and products are equal
- D. The reaction has gone to completion
2. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), ΔH = −196 kJ mol⁻¹. What increases the equilibrium yield of SO₃?
- A. Increasing the temperature
- B. Adding a catalyst
- C. Decreasing the pressure
- D. Increasing the pressure
3. What is the effect of a catalyst on the position of equilibrium?
- A. It shifts to the right
- B. It shifts to the left
- C. No effect
- D. It depends on whether the reaction is exothermic
4. A reaction A(g) + B(g) ⇌ 2C(g) has ΔH = +50 kJ mol⁻¹. What happens when the temperature is raised?
- A. The equilibrium shifts to the left
- B. The equilibrium shifts to the right
- C. There is no change in position
- D. The rate decreases
5. Why is a compromise temperature used for an exothermic reversible reaction in industry?
- A. Low temperatures give a higher yield but too slow a rate
- B. High temperatures give a higher yield and a higher rate
- C. Catalysts only work at high temperatures
- D. Low temperatures give a lower yield and a higher rate