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J. W. Hill, R. H. Petrucci, T. W. McCreary, & S. S. Perry General Chemistry 4th edition

Review Question 18.10

What is the criterion for spontaneous chemical change based on cell potentials? Explain.


Spontaneous reactions occur when the Gibb's Free Energy is negative. Cell potentials are proportional to the Gibb's Free Energy but with a sign change. Thus, a positive cell potential indicates a spontaneous chemical change.