Which half-reaction from the notes represents reduction?

Question

Accepted Answer

B. $Cu^{2+} + 2e^{-} \rightarrow Cu$

Reduction involves gain of electrons, so electrons must appear on the reactant side.
In $Cu^{2+} + 2e^{-} \rightarrow Cu$, copper ions gain electrons to form copper metal.

Answer

$Zn \rightarrow Zn^{2+} + 2e^{-}$

Answer

$Cu \rightarrow Cu^{2+} + 2e^{-}$

Answer

$Zn^{2+} \rightarrow Zn + 2e^{-}$

Which half-reaction from the notes represents reduction?

Keep practising Electrochemistry