19,879
edits
Changes
no edit summary
| style="height:20px; width:200px; text-align:center;" |[[Ethanol]] has 2 [[Carbon]] [[atom]]s, 6 [[Hydrogen]] [[atom]]s and 1 [[Oxygen]] [[atom]].
|}
==Key Stage 4==
===Meaning===
A [[Chemical Formula]] is a way to show the numbers of [[atom]]s of each [[element]] in a [[chemical]].
: Singular [[Noun]]: '''Chemical Formula'''
: Plural [[Noun]]: '''Chemical Formulae'''
===About Chemical Formulae===
: '''Chemical Formulae''' show which [[element]]s are in a [[molecule]].
: The number of each [[element]] in a [[molecule]] is shown with subscript after that [[element]].
*MgBr<sub>2</sub>: [[Magnesium Bromide]] with one [[Magnesium]] [[atom]] and two [[Bromine]] [[atom]]s.
*CO<sub>2</sub>: [[Carbon Dioxide]] with one [[Carbon]] [[atom]] and two [[Oxygen]] [[atom]]s.
*Li<sub>2</sub>O: [[Lithium Oxide]] with two [[Lithium]] [[atom]]s and one [[Oxygen]] [[atom]].