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  1. This should be in the chem section, but the answer is #4
    Voltaic cells = spontaneous reaction
    Electrolytic cells = non-spontaneous so it requires energy for the reaction to get going.

An electrolytic cell is different from a voltaic cell because in an electrolytic cell..?

1.a redox reaction occurs
2.a spontaneous reaction occurs
3.an electric current is produced
4.an electric current causes a chemical reaction