International GCSE Chemistry Formula Sheet
This chemistry formula sheet follows the Pearson Edexcel International GCSE Chemistry (4CH1) specification: the ions whose charges you must know, how to build a compound formula from them, and the mole, concentration and gas volume calculations. It is the important chemical formula list for 4CH1.
- 19 formulas
- 3 sections
- Checked 22 October 2026
Ions you must know (specification 1.38)
Learn these charges, then write formulae for compounds formed between them (1.39).
- Group 1, 2 and 3 metals
- Group 5, 6 and 7 non-metals
- Transition and other metals
- Hydrogen, hydroxide and ammonium
- Carbonate, nitrate and sulfate
- Writing a compound formula
Calculations
Relative masses, moles, yield, concentration and gas volumes.
- Amount of substance (moles)
- Percentage yield
- Concentration (mol/dm³)Paper 2
- Gas volume at rtp (24 dm³ or 24 000 cm³ per mole)Paper 2
- Rf value (chromatography)
Chemical formulas of common compounds
Formulas you will use again and again.
- Water, carbon dioxide, carbon monoxide
- Ammonia, methane, sulfur dioxide
- Hydrochloric, sulfuric and nitric acid
- Sodium hydroxide, sodium chloride
- Calcium carbonate, calcium oxide
- Copper(II) sulfate, iron(III) oxide, aluminium oxide
- Ethene, ethanol, ethanoic acid
- Glucose
Based on the Pearson Edexcel International GCSE Chemistry (4CH1) specification (Issue 3) (official source), checked 22 October 2026. Always check the formula list printed in your own exam paper.
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