Core foundations
Particles, bonding and calculations
Start with atomic structure, the periodic table, bonding and moles before moving to reactions.
Free Lessons -> GCSE / Key Stage 4 -> Chemistry
GCSE Chemistry
GCSE Chemistry lessons
Build chemistry confidence with particles, equations, practical reasoning, worked examples and brief route guidance.
35 lessons availablePractical skills includedSelf-contained lessons
Revision pathways
Applied themes
Rates, organic, analysis and resources
Build the wider chemistry story: reaction rates, equilibrium, hydrocarbons, tests, atmosphere and resources.
Practical skills
Method, variables and evaluation
Use the practical pages to practise methods, hazards, repeat readings, uncertainty and graph language.
Start learning
Study skillsAtomic structureBondingQuantitative chemistryChemical changesEnergy changesRates and equilibriumOrganic chemistryChemical analysisAtmosphereUsing resourcesPractical skillsExam technique
Lesson 1 · Study skills
Getting Started
Use particles, equations, practical evidence and precise language to approach chemistry questions.
Lesson 2 · Atomic structure
Atomic Structure
Understand protons, neutrons, electrons, isotopes, ions and relative atomic mass.
Lesson 3 · Atomic structure
Periodic Table
Use groups, periods and electron structure to explain trends in element properties.
Lesson 4 · Bonding
Ionic Bonding
Explain ion formation, ionic lattices and the properties of ionic compounds.
Lesson 5 · Bonding
Covalent Bonding
Draw covalent structures and explain melting point, boiling point and conductivity.
Lesson 6 · Bonding
Giant Structures
Compare diamond, graphite, graphene, silicon dioxide, metals and alloys.
Lesson 7 · Bonding
Nanoparticles
Describe why nanoparticle size changes properties, benefits and risks.
Lesson 8 · Quantitative chemistry
Moles Basics
Calculate formula mass, amounts in moles and particle numbers.
Lesson 9 · Quantitative chemistry
Balanced Equations
Use conservation of mass and balanced equations in calculation questions.
Lesson 10 · Quantitative chemistry
Yield
Work with empirical formula, percentage yield and atom economy.
Lesson 11 · Quantitative chemistry
Concentration
Calculate concentration in g/dm3 and mol/dm3, including unit conversions.
Lesson 12 · Quantitative chemistry
Titrations
Use titration data to calculate unknown concentrations and evaluate accuracy.
Lesson 13 · Chemical changes
Acids and pH
Explain pH, neutralisation, strong and weak acids and safe testing.
Lesson 14 · Chemical changes
Salts
Plan salt preparation from acids and insoluble bases, metals or carbonates.
Lesson 15 · Chemical changes
Reactivity
Use reactivity to predict displacement, extraction and redox reactions.
Lesson 16 · Chemical changes
Electrolysis
Predict products at electrodes and explain ion movement.
Lesson 17 · Energy changes
Energy Changes
Explain reaction profiles, bond energy and temperature changes.
Lesson 18 · Energy changes
Cells
Compare chemical cells and fuel cells with balanced benefits and limits.
Lesson 19 · Rates and equilibrium
Rates
Use collision theory to explain concentration, temperature, surface area and catalysts.
Lesson 20 · Rates and equilibrium
Rates Practical
Collect rate data, plot graphs and compare gradients fairly.
Lesson 21 · Rates and equilibrium
Equilibrium
Explain dynamic equilibrium and predict changes using Le Chatelier ideas.
Lesson 22 · Organic chemistry
Crude Oil
Describe hydrocarbons, mixtures, fractions and trends in fuel properties.
Lesson 23 · Organic chemistry
Hydrocarbons
Compare saturated and unsaturated hydrocarbons and explain cracking.
Lesson 24 · Organic chemistry
Organic Families
Recognise organic families, reactions and polymer formation.
Lesson 25 · Chemical analysis
Purity
Explain purity, melting point tests, formulations and chromatography basics.
Lesson 26 · Chemical analysis
Chromatography
Calculate Rf values and judge separation using chromatograms.
Lesson 27 · Chemical analysis
Chemical Tests
Use tests for gases, cations, anions and flame colours safely.
Lesson 28 · Atmosphere
Atmosphere
Explain how Earth's atmosphere changed and how evidence supports models.
Lesson 29 · Atmosphere
Climate
Link greenhouse gases, climate evidence, uncertainty and mitigation.
Lesson 30 · Atmosphere
Pollutants
Explain carbon monoxide, sulfur dioxide, particulates and nitrogen oxides.
Lesson 31 · Using resources
Potable Water
Compare potable water treatment, desalination and wastewater treatment.
Lesson 32 · Using resources
LCA
Use LCA stages to compare products and recycling choices.
Lesson 33 · Using resources
Extracting Metals
Compare extraction by reduction, electrolysis, phytomining and bioleaching.
Lesson 34 · Practical skills
Practical Skills
Plan fair tests, handle variables, uncertainty, risk and evaluation.
Lesson 35 · Exam technique
Exam Routine
Use a calm routine for equations, practicals, command words and checking answers.