Cracking the SAT Chemistry Subject Test

the reaction    is  spontaneous and the electrochemical cell    produces    energy.

    >   0   The reaction    is  spontaneous and energy  is  produced.

Electrolytic     Cells—If    the     sum     of  the     standard    electrode   potentials  is

negative,   energy  must    be  supplied    to  force   the oxidation   of  negative    ions

and the reduction   of  positive    ions,   turning both    species into    the elemental

forms.

    The reaction    is  not spontaneous and energy  must    be  supplied.

Review what we’ve said about oxidation-reduction and electrochemistry, and try
the following questions. The answers can be found in Part III.