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: '''Half equations''' use the letter 'e' to represent [[electron]]s.
: '''Half equations''' can be taken from [[Balanced Symbol Equation|balanced symbol equations]].
: The total [[Electrical Charge|charge]] on each side of a '''half equation''' must add to zero.
: The number of each [[element]] must be the same on both sides of a '''half equation'''.
===Examples===
{| border="1" style="border-collapse:collapse"| style="height:10px; width:100px; text-align:center;" |[[Balanced Symbol Equation]]| style="height: 10px; width:200px; text-align:center;" |'''2Li<sub>2</sub>O (l) → 4Li (l) + O<sub>2</sub> (g)'''| style="height:10px; width:200px; text-align:center;" |'''CuCl<sub>2</sub>(aq) → Cu(s) + Cl<sub>2</sub>(g)'''| style="height:10px; width:200px; text-align:center;" |'''2H<sub>2</sub>O(l) → 2H<sub>2</sub>(g) + O<sub>2</sub>(g)'''|-| style="height:10px; width:100px; text-align:center;" |'''Half Equation''' at [[cathode]]| style="height:10px; width:200px; text-align: center;" |Li<sup>+</sup> + e<sup>-</sup> → Li| style="height:10px; width:200px; text-align:center;" |Cu<sup>+2</sup>(aq) + 2e<sup>-</sup> → Cu(s)| style="height:10px; width:200px; text-align:center;" |2H<sup>+</sup>(aq) + 2e<sup>-</sup> → H<sub>2</sub>(g)|-| style="height:10px; width:100px; text-align:center;" |'''Half Equation''' at [[anode]]| style="height:10px; width:200px; text-align: center;" |2O<sup>-2</sup> → O<sub>2</sub> + 4e<sup>-</sup>| style="height:10px; width:200px; text-align:center;" |2Cl<sup>-</sup>(aq) → Cl<sub>2</sub>(g) + 2e<sup>-</sup>| style="height:10px; width:200px; text-align:center;" |4OH<sup>-</sup> → 2H<sub>2</sub>O(l) + O<sub>2</sub>(g) + 4e<sup>-</sup>|}
:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Half equations, pages 104, 289-91, GCSE Chemistry, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/178294639X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294639X&linkCode=as2&tag=nrjc-21&linkId=51599bb45a2bfaf7c1b6a978b2ca2616 ''Half equations, pages 142-144, GCSE Combined Science Trilogy; Chemistry, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''Half equations, pages 167-169, GCSE Chemistry, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Half equations, pages 206, 255-7, GCSE Combined Science Trilogy 1, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d150 ''Half equations, pages 59, 65, GCSE Chemistry; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Half-equations, pages 87, 104-105, 107, 108, 123, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']