The equilibrium constant Kc Quiz
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5 questions, one answer each
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1. What is the Kc expression for 2SO₂(g) + O₂(g) ⇌ 2SO₃(g)?
- A. [SO₃] / ([SO₂][O₂])
- B. [SO₃]² / ([SO₂]²[O₂])
- C. [SO₂]²[O₂] / [SO₃]²
- D. [SO₃]² / ([SO₂][O₂])
2. At equilibrium, [N₂O₄] = 0.010 and [NO₂] = 0.040 mol dm⁻³. N₂O₄ ⇌ 2NO₂. What is Kc?
- A. 0.16 mol dm⁻³
- B. 0.040 mol dm⁻³
- C. 6.3 mol dm⁻³
- D. 0.16 dm⁶ mol⁻²
3. Which change alters the value of Kc?
- A. Adding a catalyst
- B. Increasing the pressure
- C. Changing the temperature
- D. Increasing a reactant concentration
4. The forward reaction is exothermic. What happens to Kc when the temperature is raised?
- A. It increases
- B. It decreases
- C. It stays the same
- D. It doubles
5. For H₂(g) + I₂(g) ⇌ 2HI(g), what are the units of Kc?
- A. mol dm⁻³
- B. dm³ mol⁻¹
- C. mol² dm⁻⁶
- D. None