5 x 1 hour lessons

This module revises the core chemical calculations essential for tackling quantitative questions across the A-level course. You’ll revisit relative masses, the mole concept, empirical and molecular formulae, and balanced equations. We’ll also cover titration calculations—including back titrations—and develop fluency with the ideal gas equation, allowing you to handle a range of multi-step, exam-style problems.

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By the end of this module you will be able to:

• use relative atomic (Ar) and molecular masses (Mr) in quantitative problems

• convert between mass, moles, and number of particles using Avogadro’s constant

• apply the ideal gas equation to calculate unknown quantities

• deduce empirical and molecular formulae from composition data

• balance chemical equations and use them in reacting mass and mole ratio problems

• carry out titration calculations, including back titrations involving excess reagents

• solve multi-step problems combining several techniques (e.g. moles, volume, gas laws)

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AQA Specification Points: 1.4 Relative atomic mass and relative molecular mass 1.5 The mole & Avogadro’s constant 1.6 Ideal gas equation 1.7 Empirical & molecular formula 1.8 Balanced equations and associated calculations