General Chemistry

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Concept: Nickel-Cadmium Battery


The nickel-cadmium battery is a rechargeable battery used in some home electronics and emergency lights.

Complete the following statements about the nickel-cadmium battery, in which the electrode reactions are:

$(1)\quad Ni{O}_{2} + 2{H}_{2}O + 2{e}^{-} \xrightarrow [ ]{ } Ni{(OH)}_{2} + 2O{H}^{-}$
$(2)\quad Cd + 2O{H}^{-} \xrightarrow [ ]{ } Cd{(OH)}_{2} + 2{e}^{-}$

Half-reaction (1) is the

reaction and half-reaction (2) is the


is a spectator ion.