Atoms and the periodic table: protons, neutrons, electrons
Learn atomic structure, atomic and mass number, isotopes and how the periodic table is organised, with worked examples.
KS3GCSEMiddle SchoolHigh School⚗️ Chemistry · 13 guides
Chemistry revision notes for GCSE and high school
From electronic structure and the reactivity series to moles and electrolysis, each guide shows the method step by step and ends with questions that explain every answer. Suitable for GCSE and high school chemistry.
Ionic and covalent bonding: how atoms join, with examples
Compare ionic and covalent bonding, write ionic formulae and explain properties such as melting point and electrical conductivity.
GCSEA-LevelHigh SchoolAPAcids, bases and the pH scale: reactions and neutralisation
Read the pH scale, write neutralisation equations and name the salts acids make, with a titration calculation for Higher tier.
GCSEHigh SchoolBalancing chemical equations: a step-by-step method
Learn how to balance equations by counting atoms, with worked examples including combustion, plus practice questions with explained answers.
GCSEHigh SchoolMoles and molar mass: calculations explained step by step
Convert between mass and moles using Mr, use balanced equations to find reacting masses and calculate concentration, with worked examples.
GCSEA-LevelHigh SchoolAPStates of matter: solids, liquids, gases and changes of state
Use the particle model to explain melting, boiling and condensing, and why temperature stays constant during a change of state.
KS3GCSEMiddle SchoolHigh SchoolElectron configuration (electronic structure) and ions
Write electron shell diagrams for the first 20 elements and work out the charges of ions, with worked examples and practice questions.
GCSEHigh SchoolThe reactivity series: displacement reactions and extraction
Order metals by reactivity, predict displacement reactions and link the reactivity series to how metals are extracted, with worked examples.
GCSEHigh SchoolRates of reaction: collision theory and factors that affect it
Learn how temperature, concentration, surface area and catalysts change the rate of a reaction, and how to calculate a mean rate.
GCSEHigh SchoolElectrolysis explained: products at each electrode
See how electricity splits ionic compounds, and predict the products at the anode and cathode for molten and aqueous solutions.
GCSEA-LevelHigh SchoolAlkanes and alkenes: formulae, combustion and bromine test
Learn the hydrocarbon families, their general formulae, how they burn and how bromine water tells them apart, with worked examples.
GCSEA-LevelHigh SchoolExothermic and endothermic reactions: energy changes explained
Tell exothermic from endothermic reactions, read reaction profiles and calculate energy change from bond energies, with worked examples.
GCSEHigh SchoolChromatography and separation techniques: Rf values explained
Choose between filtration, crystallisation and distillation, and calculate Rf values in chromatography, with worked examples.
KS3GCSEMiddle SchoolHigh School