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→Key Stage 4
Some '''chemical formulae''' are written with the [[element]]s at specific points, not all grouped together, to show where different [[element]]s are [[Chemical Bond|bonded]].
*CH<sub>3</sub>COOH: [[Ethanoic Acid]] with two [[Carbon]] [[atom]]s, two [[Oxygen]] [[atom]]s and four [[Hydrogen]] [[atom]]s. This shows that one [[Carbon]] is [[Chemical Bond|bonded]] to three [[Hydrogen]] [[atom]]s while the other [[Carbon]] is [[Double Bond|double bonded]] to one [[Oxygen]] and has a [[Single Bond|single bond]] with an [[Oxygen]], which itself it bonded to a [[Hydrogen]].
===Examples===
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |'''HCl'''
| style="height:20px; width:200px; text-align:center;" |'''H<sub>2</sub>'''
| style="height:20px; width:200px; text-align:center;" |'''CH<sub>4</sub>'''
| style="height:20px; width:200px; text-align:center;" |'''C<sub>2</sub>H<sub>5</sub>OH'''
|-
|[[File:BallandStickHydrochloricAcid.png|center|200px]]
|[[File:BallandStickSulphuricAcid.png|center|200px]]
|[[File:BallandStickPropanol.png|center|200px]]
|[[File:BallandStickPropan-2-ol.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |[[Water]] has 2 [[Hydrogen]] [[atom]]s and 1 [[Oxygen]] [[atom]].
| style="height:20px; width:200px; text-align:center;" |[[Carbon Dioxide]] has 1 [[Carbon]] [[atom]] and 2 [[Oxygen]] [[atom]]s.
| style="height:20px; width:200px; text-align:center;" |[[Methane]] has 1 [[Carbon]] [[atom]] and 4 [[Hydrogen]] [[atom]]s.
| style="height:20px; width:200px; text-align:center;" |[[Ethanol]] has 2 [[Carbon]] [[atom]]s, 6 [[Hydrogen]] [[atom]]s and 1 [[Oxygen]] [[atom]].
|}