5 x 1 hour lessons

This module builds core skills in chemical calculations that underpin much of A-level Chemistry. You’ll learn how to use the mole concept, write and interpret balanced equations, calculate empirical and molecular formulae, and perform quantitative calculations involving masses, solutions, gases, and titrations. You’ll also learn to evaluate percentage yield, atom economy, and experimental uncertainty.

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By the end of this module you will be able to: • define the mole and use the Avogadro constant in calculations • calculate empirical and molecular formulae from experimental data • use balanced equations (including ionic equations) to calculate reacting masses and volumes • apply the ideal gas equation to calculate amounts of substance in the gas phase • calculate concentrations in mol dm⁻³ and g dm⁻³ and use them in titration problems • determine molar volume of a gas and apply it to reactions involving gases • evaluate percentage yield and atom economy for chemical reactions • relate equations and observations from test-tube reactions such as precipitation or displacement • identify potential experimental errors and calculate measurement uncertainty

Edexcel Specification Points: Topic 5 – Formulae, Equations and Amounts of Substance