Which half-cell reaction would have the greatest tendency to occur at the cathode?
Answer:
The correct answer is the second.
Explanation:
Oxidation occurs when an element loses electrons, acquiring a positive charge. Reduction occurs when an element gains electrons and goes from a positively charged state to a neutral one.
Aluminum metal (Al) oxidizes, so we say that Al is the reducing species, which acts by reducing [tex]Al^{3+}[/tex]. Copper ([tex]Cu^{2+}[/tex]) is reduced, so it is the oxidizing agent, it acts oxidizing to Cu.
[tex]Cu^{2+}[/tex] oxidizes to Cu, and Al reduces to [tex]Al^{3+}[/tex].
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