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: 1Al = 1Al
: 2Cl ≠ 3Cl
We need the same number of [[Chlorine]] [[atom]]s on both sides. To do that we can find the [[Lowest Common Multiple]]. In this case it is 6, so we times the left 2 [[Chlorine]]s by 3 and the right 3 [[Chlorine]]s by 2.
: _Al + 3Cl<sub>2</sub> → 2AlCl<sub>3</sub>
: 1Al ≠ 2Al
: 2O ≠ 3O
We need the same number of [[Oxygen]] [[atom]]s on both sides. To do that we can find the [[Lowest Common Multiple]]. In this case it is 6, so we times the left 2 [[Oxygen]]s by 3 and the right 3 [[Oxygen]]s by 2.
: _Al + 3O<sub>2</sub> → 2Al<sub>2</sub>O<sub>3</sub>
====Balancing Equations with Ions====
If the [[Electrical Charge|charge]] on an [[ion]] is known, this information can be used to find the [[Chemical Formula|chemical formula]] of an [[Ionic Compound|ionic compound]] and be used to '''balance''' a '''symbol equation'''.
: [[Group 1]] [[Element]]s all form +1 [[ion]]s; Li<sup>+1</sup>, Na<sup>+1</sup>, K<sup>+1</sup>
: [[Group 2]] [[Element]]s all form +2 [[ion]]s; Be<sup>+2</sup>, Mg<sup>+2</sup>, Ca<sup>+2</sup>
: [[Group 3]] [[Element]]s all form +3 [[ion]]s; Al<sup>+3</sup>
: [[Transition Metal]] [[Element]]s can form different [[ion]]s which are shown by Roman Numerals; [[Roman NumeralIron]]s; Iron can form [[Iron|Fe]](II) ]] which is [[Iron|Fe]]<sup>+2</sup> ]] or [[Iron|Fe]](III) ]] is [[Iron|Fe]]<sup>+3</sup>]],[[Manganese ]] can form [[Manganese|Mn]](II) ]] which is [[Manganese|Mn]]<sup>+2</sup> ]] or [[Manganese|Mn]](IV) ]] which is [[Manganese|Mn]]<sup>+4</sup>]]
: [[Group 5]] [[Element]]s all form -3 [[ion]]s; N<sup>-3</sup>, P<sup>-3</sup>
: [[Group 6]] [[Element]]s all form -2 [[ion]]s; O<sup>-2</sup>, S<sup>-2</sup>
: [[Group 7]] [[Element]]s all form -1 [[ion]]s; F<sup>-1</sup>, Cl<sup>-1</sup>
: Some [[Simple Covalent Molecule|covalent]] [[compound]]s can form [[Negative Ion|negative ions]]; [[Carbonate]] forms -2 [[ion]]s CO<Sub>3</sub><sup>-2</sup>
[[Sulphate]] forms -2 [[ion]]s SO<Sub>4</sub><sup>-2</sup>
|-
| style="height:20px; width:200px; text-align:center;" |[[Group 1]] with [[Group 5]]
| style="height:20px; width:200px; text-align:center;" |Text[[Group 3]] with [[Group 6]]| style="height:20px; width:200px; text-align:center;" |Text[[Sulphate]]s and [[Carbonate]]s with [[Group 2]]
|-
| style="height:20px; width:200px; text-align:center;" |Since [[Group 1]] forms +1 [[ion]]s and [[Group 5]] forms -3 [[ion]]s there will be 3 [[Group 1]] [[ion]]s for each [[Group 5]] [[ion]].
| style="height:20px; width:200px; text-align:center;" |Since [[Group 3]] forms +3 [[ion]]s and [[Group 6]] forms -2 [[ion]]s there will be 2 [[Group 3]] [[ion]]s for every 3 [[Group 6]] [[ion]]s.
| style="height:20px; width:200px; text-align:center;" |[[Sulphate]] [[ion]]s and [[Carbonate]] [[ion]]s both have a [[Electrical Charge|charge]] of -2 while [[Group 2]] [[ion]]s have a [[Electrical Charge|charge]] of +2 so there will be 1 [[Sulphate]] or [[Carbonate]] for every 1 [[Group 2]] [[ion]].
|-
| style="height:20px; width:200px; text-align:center;" |
Examples
Li<sub>3</sub>N
Na<sub>3</sub>P
| style="height:20px; width:200px; text-align:center;" |Since [[Group 3]] forms +3 [[ion]]s and [[Group 6]] forms -2 [[ion]]s there will be 2 [[Group 3]] [[ion]]s for every 3 [[Group 6]] [[ion]]s.Examples
B<sub>2</sub>S<sub>3</sub>
Al<sub>2</sub>O<sub>3</sub>
| style="height:20px; width:200px; text-align:center;" |[[Sulphate]] [[ion]]s and [[Carbonate]] [[ion]]s both have a [[charge]] of -2 while [[Group 2]] [[ion]]s have a [[charge]] of +2 so there will be 1 [[Sulphate]] or [[Carbonate]] for every 1 [[Group 2]] [[ion]].Examples
MgSO<sub>4</sub>
CaCO <sub>3</sub>
|}
===References===
====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 ''Balanced equations, pages 6-7, 64-67, GCSE Chemistry; Third Edition, Oxford University Press, 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=9e29fad914244909903e5e93f8a01d52 ''Balancing equations, pages 15, 44, GCSE Chemistry; The Revision Guide, 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 ''Balancing equations, pages 181, 183-4, 250-1, GCSE Combined Science Trilogy 1, 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 ''Balancing equations, pages 32, 33, 112, 113, 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 ''Balancing equations, pages 32, 33, 118, 119, GCSE Chemistry, CGP, AQA '']
:[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 ''Balancing equations, pages 68, 70, 283-4, GCSE Chemistry, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe09705 ''Balancing equations, pages 99, 199, GCSE Combined Science; The Revision Guide, 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 ''Balancing equations; deduction of balancing numbers, pages 188-9, GCSE Combined Science Trilogy 1, Hodder, AQA '']
:[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 ''Balancing equations; ionic equations, pages 285-6, GCSE Chemistry, Hodder, 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 ''Balancing equations; molar ratios, pages 185-6, GCSE Combined Science Trilogy 1, Hodder, AQA '']
:[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 ''Balancing numbers calculations, pages 73-4, GCSE Chemistry, Hodder, AQA '']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Balanced equations, page 205, GCSE Combined Science, Pearson Edexcel']
:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Balanced equations, page 61, GCSE Chemistry, Pearson, Edexcel']
:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Balanced equations, pages 12, 31, 32, GCSE Chemistry; The Revision Guide, CGP, Edexcel']
:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Balancing equations, pages 23-26, 89, 90, GCSE Chemistry, CGP, Edexcel '']
:[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 ''Symbol equations, page 6, GCSE Chemistry; Third Edition, Oxford University Press, 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 ''Symbol equations, pages 31-33, GCSE Chemistry, CGP, 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 ''Symbol equations, pages 31-33, GCSE Combined Science Trilogy; Chemistry, CGP, AQA '']