State symbols: In chemical equations, the three states of matter are shown as (s), (l) and (g), with (aq) for aqueous solutions.

Q: How do I revise State symbols: In chemical equations, the three states of matter are shown as (s), (l) and (g), with (aq) for aqueous solutions. for GCSE?

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Q: Is this State symbols: In chemical equations, the three states of matter are shown as (s), (l) and (g), with (aq) for aqueous solutions. guide aligned to the AQA specification?

Yes. This guide is linked to the State symbols: In chemical equations, the three states of matter are shown as (s), (l) and (g), with (aq) for aqueous solutions. topic in the AQA GCSE specification.

State symbols are short labels written after a chemical formula to show the physical state of each substance.

Study notes

From the checked teaching notes for this specification point.

The idea

What earns the marks

Correctly matches (s) to solid, (l) to liquid, (g) to gas and (aq) to an aqueous solution.
Places each state symbol immediately after the chemical formula it describes, for example HCl(aq) not (aq)HCl.
Distinguishes an aqueous solution from a pure liquid, for example NaCl(aq) compared with H₂O(l).
Uses (aq) for a substance dissolved in water even if that substance is normally a gas or solid, for example CO₂(aq).
Applies state symbols consistently to every formula on both sides of an equation, including ionic equations.
Recognises that a precipitate is shown as (s) even though it forms in solution.

Common mistakes and how to put them right

Writing (aq) for water.
Put it right: Water is the solvent, so it is always written as H₂O(l) in aqueous reactions, never H₂O(aq).
Putting the state symbol before the formula, such as (s)NaCl.
Put it right: The symbol belongs after the formula, so write NaCl(s).
Using (aq) for a liquid metal such as mercury.
Put it right: Mercury is Hg(l), because (aq) means dissolved in water.

Exam tips

Read the question wording for clues such as solution, solid, gas or molten, then choose the matching symbol.
Check every formula in the equation has a state symbol if the question asks for them, including products.
For ionic equations, label each ion and compound, remembering that a precipitate is (s) and dissolved ions are (aq).

Try the lesson

The start of the State symbols: In chemical equations, the three states of matter are shown as (s), (l) and (g), with (aq) for aqueous solutions. lesson, made from checked teaching notes for this specification point.

Have a go first

Which state symbol is written after the formula of a substance that is dissolved in water?

Tip: press 1 to 4 to choose

Listen

State symbols are short labels written after a chemical formula to show the physical state of each substance. A solid is (s), a liquid is (l) and a gas is (g). An aqueous solution, meaning a substance dissolved in water, is (aq). For example, sodium chloride solution is NaCl(aq), while solid sodium chloride is NaCl(s). Water is H₂O(l) when pure, but H₂O(g) when steam. The symbol (aq) is not a fourth state of matter; it describes a solid, liquid or gas that has dissolved in water. State symbols are placed immediately after the formula, before any plus sign or arrow. They help chemists see what is present at the start and end of a reaction, and they are needed for ionic equations and for identifying precipitates. A strong answer earns marks for these points. Correctly matches (s) to solid, (l) to liquid, (g) to gas and (aq) to an aqueous solution. Places each state symbol immediately after the chemical formula it describes, for example HCl(aq) not (aq)HCl. Distinguishes an aqueous solution from a pure liquid, for example NaCl(aq) compared with H₂O(l). Uses (aq) for a substance dissolved in water even if that substance is normally a gas or solid, for example CO₂(aq). Exam tip: Read the question wording for clues such as solution, solid, gas or molten, then choose the matching symbol.

See it

A top-down flowchart. The top node reads 'Substance in a chemical equation' and branches to four nodes: 'Solid: (s)', 'Liquid: (l)', 'Gas: (g)' and 'Aqueous solution: (aq)'. The aqueous node leads to 'Substance dissolved in water', which leads to 'Not a fourth state of matter'. All four state-symbol nodes lead to a final node reading 'Symbol placed immediately after the formula'. — It shows the four state symbols and that (aq) describes a substance dissolved in water rather than a fourth state of matter, with every symbol placed after the formula.

Label the diagram

Some boxes have lost their names. Pick the right name for each number.

The diagram again, with 3 boxes numbered instead of named. A top-down flowchart. The top node reads 'Substance in a chemical equation' and branches to four nodes: 'Solid: (s)', 'Liquid: (l)', 'Gas: (g)' and 'Aqueous solution: (aq)'. The aqueous node leads to 'Substance dissolved in water', which leads to 'Not a fourth state of matter'. All four state-symbol nodes lead to a final node reading 'Symbol placed immediately after the formula'.

1Box 1
2Box 2
3Box 3

0 of 3 labelled

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