1.22 use the state symbols (s), (l), (g) and (aq) in chemical equations to represent solids, liquids, gases and aqueous solutions respectively

State Symbols

State symbols are sometimes written after formulae in chemical equations to show which physical state each substance is in.

There are four different state symbols that you need to know:

(s)- Solid
(l)- Liquid
(g)- Gas
(aq)- Aqueous

State symbols are very useful, because they tell you the conditions required for a reaction to take place.