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Cells and half cells

Electricity from chemical reactions
In redox reactions, electrons are transferred. An electrochemical cell controls the electron transfer to
produce electrical energy. The controlled transfer of electrons is the base of all cells and batteries.

Cells and half cells
A halfcell comprises an element…

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× Electrons flow along the wire to the Cu electrode of the Cu /Cu halfcell.
× The Zn /Zn equilibrium loses electrons and moves to the left.

Zn (aq) + 2e Zn(s)

× The Cu /Cu equilibrium gains the electron and moves to the right:

Cu (aq)…

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