[tex]Cu (s)[/tex] → [tex]Cu^{+2} (aq) + 2e[/tex] is the copper half-cell when the cell operates.
What is half cell reaction?
A half-cell reaction is either an oxidation reaction in which electrons are lost, or a reduction reaction where electronic are gained.
The reactions occur in an electrochemical cell in which the electrons are lost at the anode through oxidation and consumed at the cathode where the reduction occurs.
[tex]Cu (s)[/tex] → [tex]Cu^{+2} (aq) + 2e[/tex] is the copper half-cell when the cell operates.
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