Changes

|[[File:WaterMoleculeBallandStickWater.png|center|200px]]|[[File:CarbonDioxideMoleculeBallandStickCarbonDioxide.png|center|200px]]|[[File:MethaneMoleculeBallandStickMethane.png|center|200px]]|[[File:EthanolMoleculeBallandStickEthanol.png|center|200px]]

: Some '''chemical formulae''' have brackets which indicate that the [[element]]s in the bracket are multiplied by the number after the bracket.*MgBr₂: [[Magnesium Bromide]] with one 1 [[Magnesium]] [[atom]] and two 2 [[Bromine]] [[atom]]s.*CO₂: [[Carbon Dioxide]] with one 1 [[Carbon]] [[atom]] and two 2 [[Oxygen]] [[atom]]s.*Li₂O: [[Lithium Oxide]] with two 2 [[Lithium]] [[atom]]s and one 1 [[Oxygen]] [[atom]].H*Al(OH)₃: [[Aluminium Hydroxide]] with 1 [[Aluminium]] [[atom]], with 3 lots of OH; 3 [[Oxygen]] [[atom]]s and 3 [[Hydrogen]] [[atom]]s.*Al₂SO(CO₄₃)₃: [[Sulphuric AcidAluminium Carbonate]] with two 2 [[HydrogenAluminium]] [[atom]]s, one and 3 lots of CO₃; 3 [[SulphurCarbon]] [[atom]] s and four 9 [[Oxygen]] [[atom]]s.

Some ===Examples==={| class="wikitable"| style="height:20px; width:200px; text-align:center;" |'''HCl'''| style="height:20px; width:200px; text-align:center;" |'''H₂SO₄'''| style="height:20px; width:200px; text-align:center;" |'''C₃H₈O'''| style="height:20px; width:200px; text-align:center;" |'''chemical formulaeC₃H₈O''' are written with the |-|[[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;" |[[Hydrochloric Acid]] [[elementmolecule]]s at specific points, not all grouped together, to show where different have 1 [[Hydrogen]] [[atom]] and 1 [[elementChlorine]]s are [[Chemical Bond|bondedatom]].*CH₃COOH| style="height:20px; width:200px; text-align: center;" |[[Ethanoic Sulphuric Acid]] with two [[Carbonmolecule]]s have 2 [[Hydrogen]] [[atom]]s, two 1 [[OxygenSulphur]] [[atom]]s and four 4 [[HydrogenOxygen]] [[atom]]s. This shows that one | style="height:20px; width:200px; text-align:center;" |[[Propanol]] or [[Propan-1-ol]] has 3 [[Carbon]] is [[Chemical Bond|bondedatom]] to three s and 8 [[Hydrogen]] [[atom]]s while and 1 [[Oxygen]] atom. This has the other same '''chemical formula''' as [[CarbonPropan-2-ol]] is but a different shape. This may be written with the [[Double BondStructural Formula|double bondedstructural formula]] '''CH₃CH₂CH₂OH''' to one show where the OH group is attached.| style="height:20px; width:200px; text-align:center;" |[[OxygenIsopropyl Alcohol]] or [[Propan-2-ol]] has 3 [[Carbon]] [[atom]] s and has a 8 [[Hydrogen]] [[Single Bond|single bondatom]] with an s and 1 [[Oxygen]], which itself it bonded to atom. This has the same '''chemical formula''' as [[Propan-1-ol]] but a different shape. This may be written with the [[HydrogenStructural Formula|structural formula]]'''CH₃CHOHCH₃''' to show where the OH group is attached.|} ====OCR====:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Chemical formulae, pages 36-37, Gateway GCSE Chemistry, Oxford, OCR '']