Dynamic equilibrium and Le Chatelier's principle Quiz
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5 questions, one answer each
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1. In a sealed system at dynamic equilibrium, which statement is correct?
- A. The forward reaction has stopped
- B. The concentrations of reactants and products are equal
- C. The forward and reverse reactions occur at equal rates
- D. The rate of the reverse reaction is zero
2. For H₂(g) + I₂(g) ⇌ 2HI(g), the pressure is increased at constant temperature. What happens to the position of equilibrium?
- A. It shifts right
- B. It shifts left
- C. It does not change, as there are 2 mol of gas on each side
- D. It shifts right because the volume decreases
3. For 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), ΔH = −196 kJ mol⁻¹, which change increases the equilibrium yield of SO₃?
- A. Raising the temperature
- B. Lowering the pressure
- C. Adding a catalyst
- D. Lowering the temperature
4. Which best explains why the Haber process uses 450 °C rather than 200 °C?
- A. The yield is higher at 450 °C
- B. The rate is too slow at 200 °C, even though the yield would be higher
- C. The reaction is endothermic
- D. The catalyst only works below 200 °C
5. Water is removed from the equilibrium CH₃COOH + C₂H₅OH ⇌ CH₃COOC₂H₅ + H₂O. What happens?
- A. The equilibrium shifts left
- B. The equilibrium shifts right and the yield of ester rises
- C. There is no change because water is a liquid
- D. Equilibrium is reached more slowly