MCAT General Chemistry Question 173: Answer and Explanation
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Question: 173
8. Which of the following can alter the emf of an electrochemical cell?
- A. The mass of the electrodes
- B. The length of the wire connecting the half-cells
- C. The overall size of the battery
- D. The temperature of the solutions in the half-cells
Correct Answer: D
Explanation:
E°cell is dependent upon the change in free energy of the system through the equation RT ln Keq = nFE°cell. The temperature, T, appears in this equation; thus, a change in temperature will impact the E°cell.