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ion/ion half cells
this type of half cell is needed when redox system does not contain a metal or where both the oxidised and reduced species in the half equation are ions
fuel cells
a fuel cell uses the energy from the reaction of a fuel with oxygen to create a voltage
primary cells
non rechargeable cells, the cell reaction cannot be reversed
secondary cells
rechargeable cells- the cell reaction is reversed during the recharging processes regenerating the chemicals in the cell
metal/metal ion half cell
a half cell contains the chemical species present in a redox half equation
electrochemical cell
two half cells must be joined together in order for electrons to flow from one half cell to the other through the wires (- to +)
standard electrode potential
the tendency to be reduced and gain electrons