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This equation is now balanced: '''4Al + 3O<sub>2</sub> → 2Al<sub>2</sub>O<sub>3</sub>'''
==Key Stage 4==
===Meaning===
A [[Balanced Symbol Equation]] is a way to show the [[reactant]]s and [[product]]s in a [[Chemical Reaction|chemical reaction]] using the [[Chemical Formula|chemical formulae]] of the [[reactant]]s and [[product]]s.
===About Balanced Symbol Equations===
: [[Balanced Symbol Equation]]s shows the number of [[molecule]]s of each [[chemical]] and the numbers of each [[atom]] within those [[chemical]]s.
: [[Balanced Symbol Equation]]s can be used to find the quantity of each [[chemical]] needed to have a complete [[Chemical Reaction|chemical reaction]].
===Balancing Equations===
: You may know the [[Chemical Formula|chemical formulae]] of the [[reactant]]s and [[product]]s but not know the number of each [[chemical]] needed. For that you must '''balance the equation'''.
: To '''balance and equation''' you need the same number of each type of [[atom]] on the left as you do on the right.
{| class="wikitable"
|+Magnesium Fluoride + Potassium → Potassium Fluoride + Magnesium
|-
| style="height:20px; width:200px; text-align:center;" |Step 1
| style="height:20px; width:200px; text-align:center;" |Step 2
| style="height:20px; width:200px; text-align:center;" |Step 3
|-
|[[File:Picture.png|center|200px]]
|[[File:Picture.png|center|200px]]
|[[File:Picture.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:left;" |
: _MgF<sub>2</sub> + _K → _KF + _Mg
: Reactants = Products
: 1Mg = 1Mg
: 2F ≠ 1F
: 1K = 1K
We need 2 [[Fluorine]] [[atom]]s in the [[product]]s.
| style="height:20px; width:200px; text-align:left;" |
: _MgF<sub>2</sub> + _K → 2KF + _Mg
: Reactants = Products
: 1Mg = 1Mg
: 2F = 2F
: 1K ≠ 2K
There are now too many [[Potassium]] [[atom]]s in the [[product]]s so we need 2 in the [[reactant]]s.
| style="height:20px; width:200px; text-align:left;" |
: _MgF<sub>2</sub> + 2K → 2KF + _Mg
: Reactants = Products
: 1Mg = 1Mg
: 2F = 2F
: 2K = 2K
This equation is '''balanced''':
: MgF<sub>2</sub> + 2K → 2KF + Mg
|}