An electrochemical battery is a device powered by oxidation and reduction reactions that are physically separated so that the electrons must travel through a wire from the reducing agent to the oxidizing agent. The reducing agent loses electrons and is oxidized in a reaction that takes place at an electrode called the anode. The electrons flow through a wire to a second electrode, the cathode, where an oxidizing agent gains electrons and is thus reduced. To maintain a net zero charge in each compartment, there is a limited flow of ions through a salt bridge.

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