Dynamic equilibrium and Le Chatelier's principle Quiz
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5 questions, one answer each
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1. At dynamic equilibrium:
- A. Concentrations are equal
- B. Reactions have stopped
- C. Forward and backward rates are equal
- D. Only the forward reaction occurs
2. A reaction has ΔH = −100 kJ mol⁻¹. Raising the temperature will:
- A. Shift the position left and lower the yield
- B. Shift the position right and raise the yield
- C. Not change the position
- D. Increase the activation energy
3. For 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), raising the pressure:
- A. Shifts left
- B. Has no effect
- C. Shifts right, as there are fewer gas moles on the right
- D. Lowers the rate
4. Adding a catalyst to a system at equilibrium:
- A. Shifts the position right
- B. Shifts the position left
- C. Increases the equilibrium yield
- D. Changes the time to reach equilibrium but not the position
5. A plant uses a moderate temperature for an exothermic reaction because:
- A. High temperature gives a higher yield
- B. It balances an acceptable yield and rate
- C. Low temperature gives a fast rate
- D. Catalysts only work at moderate temperature