IGCSE Chemistry Formula Sheet
Built by Pietro Meloni, PhD Candidate in Physics · 10+ Years Teaching IGCSE
Cambridge 0620 · 7 formulas · 3 sections
The key formulas and equations for Cambridge IGCSE Chemistry (0620). Chemistry has fewer formulas than maths or physics, but understanding how to apply them is critical for exam success.
Each equation is explained with tips on common mistakes and how examiners expect you to show working.
Moles and Calculations
Number of moles
…Mass of substance divided by its relative formula mass. Always check your units — mass must be in grams.
Moles from concentration
…Concentration (mol/dm³) times volume (dm³). Remember to convert cm³ to dm³ by dividing by 1000.
Concentration
…Moles divided by volume in dm³. This is the rearrangement you need for titration calculations.
Gas Calculations
Molar volume
…At room temperature and pressure (RTP), one mole of any gas occupies 24 dm³. This is provided in the exam.
Percentage yield
…Compares what you actually obtained to the theoretical maximum. Always less than 100% in practice.
Atom economy
…Measures how much of the reactant atoms end up in the useful product. Higher atom economy = less waste.
Energetics
Energy change
…Mass of water (g) × specific heat capacity (4.18 J/g°C) × temperature change. Used in calorimetry experiments.
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