A zinc-copper cell is constructed:Zn | Zn || Cu | Cu.What occurs to the mass of the copper electrode as the reaction proceeds? Group of answer choicesIt remains the same.It increases.cannot be determinedIt decreases.
Question
A zinc-copper cell is constructed:Zn | Zn || Cu | Cu.What occurs to the mass of the copper electrode as the reaction proceeds? Group of answer choicesIt remains the same.It increases.cannot be determinedIt decreases.
Solution
In a zinc-copper cell, the reaction that takes place is:
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
This is a redox reaction where zinc is oxidized (loses electrons) and copper ions are reduced (gain electrons).
The zinc electrode (anode) dissolves into the solution as Zn2+ ions, leaving 2 electrons behind at the anode. These electrons then move through the external circuit to the copper electrode (cathode).
At the copper electrode, Cu2+ ions from the solution gain these electrons and get reduced to form copper metal, which gets deposited on the copper electrode.
So, as the reaction proceeds, the mass of the copper electrode increases because copper metal is being deposited onto it.
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