Track the particles. Balance the change.
Chemistry.
Practice. Play.
Progress.
GCSE Chemistry is particle tracking. Name what the particles are, how they are held together, and what changes in a reaction. Then balance atoms, charge and mass. These guides keep Combined and Triple content in teacher language, with the structures, equations and calculations that actually score.
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Students type: temperature change required practical GCSE Chemistry
Open guide Revision guideCeramics and their usesStudents type: ceramics properties uses GCSE Chemistry
Open guide Revision guideNanoparticlesStudents type: nanoparticles GCSE Chemistry surface area
Open guide Revision guideEstersStudents type: esterification ethyl ethanoate GCSE
Open guide Revision guideCondensation polymersStudents type: condensation polymerisation GCSE Chemistry
Open guide Revision guideAlcohols and carboxylic acidsStudents type: fermentation vs hydration of ethene ethanol GCSE
Open guide Revision guideEquilibria and Le Chatelier’s principleStudents type: Le Chatelier’s principle GCSE Chemistry
Open guide Revision guideThe Haber processStudents type: Haber process conditions 450°C 200 atm
Open guide Revision guidePolymers and addition polymerisationStudents type: addition polymerisation poly(ethene) GCSE
Open guide Revision guideCrackingStudents type: cracking hydrocarbons GCSE Chemistry
Open guide Revision guideCrude oil and fractional distillationStudents type: fractional distillation crude oil GCSE
Open guide Revision guideAlkenesStudents type: alkenes general formula CnH2n GCSE
Open guideStructure and bonding
Structure and bonding
made memorable.
Atoms, electronic structure, ionic, covalent and metallic bonding, and the periodic table.
All Structure and bonding revisionAtomic structure
Protons, neutrons and electrons, atomic and mass numbers, isotopes, electronic structure and the evidence that replaced the plum pudding model.
Bonding and structure
Ionic, covalent and metallic bonding, giant lattices versus simple molecules, and why diamond, graphite and metals behave as they do.
The periodic table
Groups and periods, Mendeleev, Group 1, Group 7, Group 0, and how electronic structure explains reactivity trends.
Atoms, elements and compounds
GCSE Chemistry revision on atoms, elements and compounds: particle diagrams, chemical formulae, and how a mixture differs from a reaction that makes a new substance.
Isotopes
GCSE Chemistry revision on isotopes: same proton number, different neutrons, relative atomic mass as a weighted mean, and why chemical properties stay the same.
Electronic structure
GCSE Chemistry revision on electronic structure: shells 2, 8, 8, how group and period follow the outer electrons, and why noble gases are unreactive.
Ions and formulae
GCSE Chemistry revision on ions and formulae: charges on Na⁺, Mg²⁺, O²⁻, SO₄²⁻, balancing charges in salts, and writing formulae with state symbols.
Ionic bonding
GCSE Chemistry revision on ionic bonding: electron transfer from metal to non-metal, giant ionic lattices, and why salts have high melting points but only conduct when molten or dissolved.
Covalent bonding
GCSE Chemistry revision on covalent bonding: shared electron pairs in H₂, Cl₂, H₂O, CH₄ and CO₂, and why simple molecules have low melting points and do not conduct.
Metallic bonding
GCSE Chemistry revision on metallic bonding: positive ions in a sea of delocalised electrons, and why metals conduct, bend and often have high melting points.
States of matter
GCSE Chemistry revision on states of matter: particle arrangement in solids, liquids and gases, changes of state, and how bonding type decides melting and boiling points.
Giant covalent structures
GCSE Chemistry revision on giant covalent structures: diamond, graphite, graphene and silicon dioxide, and why graphite conducts while diamond does not.
Group 1 alkali metals
GCSE Chemistry revision on Group 1 alkali metals: one outer electron, reactions with water and oxygen, and why reactivity increases down the group.
Group 7 halogens
GCSE Chemistry revision on Group 7 halogens: diatomic molecules, displacement reactions, colours, and why reactivity decreases down the group.
Group 0 noble gases
GCSE Chemistry revision on Group 0 noble gases: full outer shells, monatomic gases, low reactivity, and boiling points that increase down the group.
Transition metals
GCSE Chemistry revision on transition metals (Triple): coloured compounds, variable ions such as Fe²⁺ and Fe³⁺, catalysts, and comparison with Group 1 metals.
Mendeleev and the periodic table
GCSE Chemistry revision on Mendeleev and the periodic table: atomic number order, groups and periods, left gaps, and how electronic structure explains the modern table.
Nanoparticles
GCSE Chemistry revision on nanoparticles: 1–100 nm scale, huge surface area to volume ratio, uses in catalysts, sunscreens and medicine, and why their small size raises health and environmental questions.
Ceramics and their uses
GCSE Chemistry revision on ceramics: clay fired to high temperature, giant ionic or covalent structures, hardness, brittleness, high melting points, electrical insulation, and uses from bricks to engine components.
Chemical changes
Chemical changes
made memorable.
Acids and alkalis, electrolysis, rates, catalysts and energy changes.
All Chemical changes revisionAcids and alkalis
pH, strong and weak acids, neutralisation equations, salt names, carbonates, metals and the titration practical.
Electrolysis
Molten and aqueous electrolysis, cathode and anode, half equations, aluminium extraction and the brine cell.
Rates of reaction
Collision theory, concentration, pressure, surface area, temperature, catalysts, rate graphs and reversible reactions.
Energy changes
Exothermic and endothermic reactions, reaction profiles, activation energy, bond energies and simple cells.
The pH scale and indicators
GCSE Chemistry revision on the pH scale and indicators: H⁺(aq) and OH⁻(aq), universal indicator colours, and the ten-fold change in hydrogen ion concentration.
Neutralisation and salts
GCSE Chemistry revision on neutralisation and salts: acid plus metal, base or carbonate, naming chlorides, sulfates and nitrates, and writing equations with state symbols.
Strong and weak acids
GCSE Chemistry revision on strong and weak acids (Higher): complete versus partial ionisation, pH at the same concentration, and why strength is not the same as concentration.
Titration
GCSE Chemistry revision on titration: burette, pipette, indicator, concordant titres within 0.10 cm³, the mean, and calculating concentration from a worked titre.
The reactivity series
GCSE Chemistry revision on the reactivity series: potassium to gold, displacement, metal plus acid or water, and linking reactivity to how easily atoms form positive ions.
Metal extraction
GCSE Chemistry revision on metal extraction: native metals, reduction of oxides with carbon, electrolysis for metals above carbon, and phytomining or bioleaching for copper.
Electrolysis of molten salts
GCSE Chemistry revision on electrolysis of molten salts: mobile ions, cathode reduction, anode oxidation, and half equations such as Pb²⁺ + 2e⁻ → Pb.
Electrolysis of solutions
GCSE Chemistry revision on electrolysis of aqueous solutions: hydrogen versus metal at the cathode, halogen versus oxygen at the anode, and the brine cell.
Extracting aluminium
GCSE Chemistry revision on extracting aluminium: bauxite, cryolite to lower the melting point, carbon anodes, and half equations for Al³⁺ and O²⁻.
Collision theory
GCSE Chemistry revision on collision theory: successful collisions, activation energy, and how concentration, pressure, surface area and temperature change rate.
Catalysts
GCSE Chemistry revision on catalysts: alternative pathway, lower activation energy, reaction profiles, and named examples including enzymes and iron in the Haber process.
Rates required practical
GCSE Chemistry revision on the rates required practical: marble chips and acid, sodium thiosulfate and HCl, measuring mass, gas volume or a disappearing cross, and fair tests.
Exothermic and endothermic reactions
GCSE Chemistry revision on exothermic and endothermic reactions: energy transfer to or from the surroundings, temperature change, and everyday examples including combustion and sports packs.
Reaction profiles
GCSE Chemistry revision on reaction profiles: activation energy, ΔH, exothermic and endothermic sketches, and how a catalyst lowers the hump but not the enthalpy change.
Bond energies
GCSE Chemistry revision on bond energies: bond breaking is endothermic, bond making is exothermic, and ΔH = energy in to break bonds minus energy out when bonds form.
The Haber process
GCSE Chemistry revision on the Haber process: N₂ + 3H₂ ⇌ 2NH₃, iron catalyst, 450 °C and 200 atmospheres as compromise conditions, recycling, and ammonia for fertilisers.
Equilibria and Le Chatelier’s principle
GCSE Chemistry revision on reversible reactions, dynamic equilibrium in a closed system, and Le Chatelier’s principle for concentration, pressure and temperature, including why catalysts do not change yield.
Temperature change required practical
Plan the GCSE Chemistry temperature-change investigation: exothermic or endothermic dissolving or neutralisation, thermometer readings, insulation, fair test, mean temperature change and graph.
Quantitative chemistry
Quantitative chemistry
made memorable.
Conservation of mass, relative formula mass, moles, concentration, yield and atom economy.
All Quantitative chemistry revisionChemical calculations
Relative formula mass, conservation of mass, moles, concentration, limiting reactants, percentage yield and atom economy.
Moles
GCSE Chemistry revision on moles: n = m / Mᵣ, Avogadro’s constant, mole ratios from balanced equations, and a full worked mass-to-mass calculation.
Conservation of mass
GCSE Chemistry revision on conservation of mass: atoms rearranged not created, closed versus open systems, and why a flask can lose mass when a gas escapes.
Concentration
GCSE Chemistry revision on concentration: mol/dm³ and g/dm³, converting cm³ to dm³, dilution, and using concentration in titration calculations.
Atom economy and yield
GCSE Chemistry revision on atom economy and percentage yield: two different formulae, why they are not the same, and why industry wants both high yield and high atom economy.
Organic chemistry
Organic chemistry
made memorable.
Crude oil, alkanes, alkenes, cracking, polymers, alcohols and carboxylic acids — carbon chemistry as a chain of reactions.
All Organic chemistry revisionAlkanes
GCSE Chemistry revision on alkanes: saturated hydrocarbons, the general formula CnH2n+2, displayed formulae, combustion, and how boiling point, viscosity and flammability change with chain length.
Alkenes
GCSE Chemistry revision on alkenes: unsaturated hydrocarbons, CnH2n, the C=C functional group, the bromine-water test, and addition reactions with hydrogen, steam, bromine and other halogens.
Crude oil and fractional distillation
GCSE Chemistry revision on crude oil as a finite mixture of hydrocarbons and how fractional distillation separates petrol, kerosene, diesel, fuel oil and bitumen by boiling point.
Cracking
GCSE Chemistry revision on cracking long-chain alkanes into shorter alkanes and alkenes: thermal and catalytic conditions, example equations, and why industry matches supply to demand for fuels and polymers.
Polymers and addition polymerisation
GCSE Chemistry revision on addition polymerisation: alkene monomers, repeat units, poly(ethene) and poly(propene), and why plastics are useful, persistent in landfill, and awkward to recycle.
Alcohols and carboxylic acids
GCSE Chemistry (often Triple) revision on alcohols and carboxylic acids: homologous series, ethanol by fermentation and hydration, combustion, weak-acid behaviour, carbonates, and esters from alcohol plus acid.
Condensation polymers
GCSE Chemistry (Triple) revision on condensation polymerisation: monomers with two functional groups, small-molecule by-products such as water, nylon and polyester, and how they differ from addition polymers.
Esters
GCSE Chemistry revision on esters: esterification from alcohol and carboxylic acid, naming ethyl ethanoate, reversible acid-catalysed conditions, uses in flavourings, and hydrolysis back to acid and alcohol.
Earth and atmosphere
Earth and atmosphere
made memorable.
How the atmosphere evolved, greenhouse gases, climate change and atmospheric pollutants.
All Earth and atmosphere revisionThe atmosphere
How Earth’s atmosphere changed, the greenhouse effect, climate change, carbon footprint and pollutant gases from combustion.
The greenhouse effect and climate change
GCSE Chemistry revision on the greenhouse effect and climate change: CO₂, methane and water vapour, long-wave radiation, human activities, and carbon footprint.
Atmospheric pollutants
GCSE Chemistry revision on atmospheric pollutants: complete and incomplete combustion, carbon monoxide, soot, sulfur dioxide, oxides of nitrogen and acid rain.
The early atmosphere
GCSE Chemistry revision on the early atmosphere: volcanic CO₂, condensing oceans, photosynthesis producing oxygen, and how the modern nitrogen–oxygen air formed.
Potable water
GCSE Chemistry revision on potable water: screening, sedimentation, filtration, chlorination, desalination by distillation or reverse osmosis, and the required practical to test and purify water.
Life cycle assessments
GCSE Chemistry revision on life cycle assessments: raw materials, manufacture, use, disposal, recycling, and how to compare products without pretending every number is exact.
Built for real revision
GCSE Chemistry,
without the waffle.
Teacher-written GCSE Chemistry revision for Combined and Triple Science: atomic structure, bonding, the periodic table, acids, electrolysis, rates, organic chemistry, calculations and the atmosphere.
60 guides, each with a memory hook, precise knowledge, a worked example and a retrieval check. Use a page for a quick refresh before exam questions, or as the first step in a spaced revision session.