Gibbs free energy Quiz
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5 questions, one answer each
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1. A reaction has ΔH = −40 kJ mol⁻¹ and ΔS = +100 J K⁻¹ mol⁻¹. When is it feasible?
- A. At all temperatures
- B. Only at high temperatures
- C. Only at low temperatures
- D. At no temperature
2. ΔH = +50 kJ mol⁻¹ and ΔS = +125 J K⁻¹ mol⁻¹. At what temperature does the reaction become feasible?
- A. 0.4 K
- B. 2.5 K
- C. 400 K
- D. 6250 K
3. What is the value of K when ΔG = 0?
- A. 0
- B. 1
- C. Infinity
- D. It cannot be found
4. A reaction has a large, positive K. What is true of ΔG?
- A. ΔG is negative
- B. ΔG is positive and large
- C. ΔG is zero
- D. ΔG cannot be found
5. Which statement explains why a reaction with ΔG negative may not occur?
- A. The reaction must be exothermic
- B. K must be less than 1
- C. ΔS must be negative
- D. The activation energy is too high for the reaction to occur at an observable rate