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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.






Answer:

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.