R2.3 How far? The extent of chemical change Quiz
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5 questions, one answer each
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1. For A(g) + B(g) ⇌ 2C(g), Kc = 9.0. What is Kc for 2C(g) ⇌ A(g) + B(g) at the same temperature?
- A. −9.0
- B. 0.11
- C. 3.0
- D. 9.0
2. Which change alters the value of Kc for an equilibrium?
- A. Adding a catalyst
- B. Increasing the pressure
- C. Increasing the temperature
- D. Adding more reactant
3. For CO(g) + 3H₂(g) ⇌ CH₄(g) + H₂O(g), ΔH < 0, which conditions give the highest equilibrium yield of methane?
- A. High T, high P
- B. Low T, high P
- C. High T, low P
- D. Low T, low P
4. In a sealed flask of water at constant temperature, which is true once equilibrium is reached?
- A. Evaporation has stopped
- B. The rate of evaporation equals the rate of condensation
- C. All the water has evaporated
- D. The vapour pressure keeps rising
5. Kc for a reaction is 1.0 × 10⁻¹². What can be deduced?
- A. The reaction is very fast
- B. Equilibrium lies far to the left
- C. Equilibrium lies far to the right
- D. The reaction is exothermic