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==Key Stage 4==
===Meaning===
A '''half equation''' is a type of [[Balanced Symbol Equation|symbol equation]] which shows how individual [[ion]]s gain or lose [[electron]]s in at an [[ionelectrode]]ic during [[Chemical Reaction|chemical reactionselectrolysis]].
===About Half Equations===
: In '''half equations''' only one [[ion]] is considered at a time, or the changes at one [[electrode]].
: '''Half equations''' use the letter 'e' to represent [[electron]]s.
: '''Half equations''' can be taken from [[Balanced Symbol Equation|balanced symbol equations]].
'''Half Equations'''
2O<sup>-2</sup> → O<sub>2</sub> + 4e<sup>-</sup> → 2O<sup>-2</sup>