The energy released in a spontaneous redox reaction can be used to perform electrical work. This task is accomplished through a voltaic (or galvanic) cell, a device in which the transfer of electrons takes place through an external pathway rather than directly between reactants present in the same reaction vessel. Explain the operation of a voltaic cell and identify the key components (anode, cathode, salt bridge) and how we can determine the half-reactions that occur at each electrode of a voltaic cell from the overall cell reaction.
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