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Formulae and equations
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What formulae and equations tell you

What formulae and equations tell you

Flowchart showing the steps from identifying ions to balancing full and ionic equations, with an aluminium sulfate example

A chemical formula shows what atoms or ions are present and their ratio, while a chemical equation shows how reactants turn into products. The order of operations is essential: get the formulae right first, then balance the equation, then add state symbols, and simplify to an ionic equation if required.

Formulae and equations Lesson

  1. A Level
  2. /Chemistry
  3. /Formulae and equations

Step-by-step lessons covering Eduqas A Level Chemistry Formulae and equations for A Level Chemistry. Each lesson works through exam-style questions in Component 1, Component 2 and Component 3 format. Build confidence with atomic structure, bonding and moles calculations early on, since these underpin the more demanding organic mechanisms, equilibrium and practical-analysis topics that dominate Year 2.