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 ⇌ B, K = 10. A mixture has [A] = 0.50 and [B] = 2.0 mol dm⁻³. What happens?
- A. Net forward reaction
- B. Net reverse reaction
- C. No net change
- D. K decreases to 4.0
2. ΔG° for a reaction is +10.0 kJ mol⁻¹ at 298 K. What is K? (R = 8.31 J K⁻¹ mol⁻¹)
- A. 0.018
- B. 0.996
- C. 1.00
- D. 56.6
3. 2.0 mol of X is placed in a 1.0 dm³ flask: X ⇌ 2Y. At equilibrium [Y] = 0.40 mol dm⁻³. What is [X]?
- A. 1.6 mol dm⁻³
- B. 1.8 mol dm⁻³
- C. 2.0 mol dm⁻³
- D. 0.20 mol dm⁻³
4. Which change alters K rather than Q?
- A. Adding a reactant
- B. Removing a product
- C. Changing the temperature
- D. Compressing the mixture
5. K for a reaction is 1.0 at 500 K. What is ΔG° at 500 K?
- A. −4.2 kJ mol⁻¹
- B. 0 kJ mol⁻¹
- C. +4.2 kJ mol⁻¹
- D. Cannot be determined