medium · MCAT chem-phys
A researcher places a galvanic cell with the spontaneous reaction Zn + Cu^2+ rightarrow Zn^2+ + Cu in a constant-temperature water bath and allows it to run while measuring cell potential continuously.
As the cell discharges toward equilibrium, which statement correctly describes the entropy change of the universe and the relationship between the measured cell potential and the standard potential at the moment Q = K?
- Δ S_universe reaches its maximum, and the cell potential equals zero while the standard potential remains positive
- Δ S_universe reaches its maximum, and both the cell potential and the standard potential have fallen to zero
- Δ S_universe continues to increase, and the cell potential equals the standard potential because Q no longer changes
- Δ S_universe becomes negative, and the cell potential drops below the now-constant standard potential
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