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A cell is built using two electrodes: What reaction occurs at the cathode? Al3+ + 3e —> Al E° = -1.66V Cu2+ + 2e —> Cu E° = +0.34V a. Cu —> Cu2+ + 2e- b. Cu2+ + 2e- —> Cu c. Al3+ + 3e- —> Al d. Al —> Al3+
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A cell is built using two electrodes: What reaction occurs at the cathode?

Al3+ + 3e —> Al E° = -1.66V
Cu2+ + 2e —> Cu E° = +0.34V

a. Cu —> Cu2+ + 2e-
b. Cu2+ + 2e- —> Cu
c. Al3+ + 3e- —> Al
d. Al —> Al3+ + 3e-

User Levenshtein
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A is the answer your welcome 
User Phil Ninan
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