Chemistry 0620
Connect particles and bonding to reactions, chemical calculations and practical methods. Learn to explain observations and predict chemical changes.
What you'll cover
- States of matter
- Atoms, elements and compounds
- Stoichiometry
- Electrochemistry
- Chemical energetics
- Chemical reactions
Published syllabus exam years: 2023, 2024, 2025, 2026, 2027, 2028, 2029. Confirm exam-series and centre availability with your school and Cambridge.
Revision quick references
Need one idea to click? Start with a short explanation, then try the worked examples.
Your route through Chemistry
Version 2
49 of 49 sections have teaching and practice
Start the learning pathwayStudy options and assessment
143 sequenced lessons cover all twelve syllabus areas with 429 guided, independent and application problems. 49 of the 49 syllabus sections have linked teaching and practice. This measures availability of mapped content, not full programme completion or guaranteed exam readiness. Three earlier starter lessons remain available. Extend your formula notebook as new reagents and ions appear; the starter notebook is not a universal formula reference. Cumulative assessment and supervised practical work remain outstanding. Paper-based method exercises support laboratory learning but do not demonstrate practical competence or complete either practical-assessment route. Written practice is self-checked. AI-assisted editorial checks do not replace human subject-teacher review, which remains pending.
View syllabus coverage
Every syllabus section now links to original teaching and staged practice. Follow the sequence or choose a topic to revisit, checking the Core and Extended labels. A section link describes available content, not a completed programme, teacher approval, practical competence, a grade or every possible exam question. Cumulative assessment, supervised practical experience and human subject-teacher review remain outstanding.
States of matter
- Solids, liquids and gases1.1
- Diffusion1.2
Atoms, elements and compounds
- Elements, compounds and mixtures2.1
- Atomic structure and the Periodic Table2.2
- Isotopes2.3
- Ions and ionic bonds2.4
- Simple molecules and covalent bonds2.5
- Giant covalent structures2.6
- Metallic bonding2.7
Stoichiometry
- Formulae3.1
- Relative masses of atoms and molecules3.2
- The mole and the Avogadro constant3.3
Electrochemistry
- Electrolysis4.1
- Hydrogen–oxygen fuel cells4.2
Chemical energetics
- Exothermic and endothermic reactions5.1
Chemical reactions
- Physical and chemical changes6.1
- Rate of reaction6.2
- Reversible reactions and equilibrium6.3
- Redox6.4
Acids, bases and salts
- The characteristic properties of acids and bases7.1
- Oxides7.2
- Preparation of salts7.3
The Periodic Table
- Arrangement of elements8.1
- Group I properties8.2
- Group VII properties8.3
- Transition elements8.4
- Noble gases8.5
Metals
- Properties of metals9.1
- Uses of metals9.2
- Alloys and their properties9.3
- Reactivity series9.4
- Corrosion of metals9.5
- Extraction of metals9.6
Chemistry of the environment
- Water10.1
- Fertilisers10.2
- Air quality and climate10.3Clean dry air: composition and approximate proportionsAir pollutants: connect each source with its effectReducing climate change and acid-rain emissionsPhotosynthesis: reactants, products and light energyThe greenhouse effect: absorption, emission and energy balanceEngine nitrogen oxides and catalytic-converter reactionsPhotosynthesis: balance the symbol equation and quantities
Organic chemistry
- Formulae, functional groups and terminology11.1
- Naming organic compounds11.2
- Fuels11.3
- Alkanes11.4
- Alkenes11.5
- Alcohols11.6
- Carboxylic acids11.7
- Polymers11.8Polymers and polyethene: many monomers, one long chainPlastics: useful properties and disposal consequencesAddition repeats: deduce the monomer and retain side groupsPolyamides and nylon: monomers, links and water lossPolyesters and PET: ester links and return to monomersProteins: amino acids and natural polyamide links
Experimental techniques and chemical analysis
- Experimental design12.1
- Acid–base titrations12.2
- Chromatography12.3
- Separation and purification12.4
- Identification of ions and gases12.5Carbonate and halide tests: reagent then observationNitrate, sulfate and sulfite: distinguish three similar namesWhite cation precipitates and the separate ammonium gas testColoured cation precipitates: chromium, copper and ironGas identification: six tests and six specific observationsFlame tests: six metal-ion colours and contamination limits
Lessons and worked examples
Choose where to begin
Choose a lesson, try the practice and explain the idea without your notes. Your study checks help you decide what to review.
- 01
Particles, states and changes of state
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 02
Heating curves and gas-particle explanations
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 03
Diffusion and random particle motion
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 04
Gas diffusion and relative molecular mass
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 05
Elements, compounds and mixtures
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 06
Atomic structure, shells and the Periodic Table
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 07
Isotopes and atomic symbols
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 08
Isotope abundances and relative atomic mass
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 09
Group I and VII ions and ionic bonding
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 10
Ionic lattices and multicharged ions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 11
Shared pairs and simple covalent molecules
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 12
Multiple covalent bonds and molecular properties
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 13
Diamond and graphite: structure and uses
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 14
Silicon dioxide and giant covalent networks
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 15
Metallic bonding, conduction and shaping
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 16
Reading formulas and building a formula notebook
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 17
Balancing equations and using state symbols
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 18
Empirical ratios and ionic formulas
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 19
Ionic equations and spectator ions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 20
Relative atomic, molecular and formula masses
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 21
Reacting masses by simple proportions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 22
Concentration units and solution volume
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 23
Moles, molar mass and particle counts
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 24
Stoichiometric ratios and limiting reactants
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 25
Gas volumes at room temperature and pressure
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 26
Solution concentrations and titration calculations
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 27
Empirical and molecular formulas from data
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 28
Percentage yield, composition and purity
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 29
Electrolysis and molten binary compounds
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 30
Aqueous electrolysis: brine and dilute acid
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 31
Charge transfer and electrode half-equations
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 32
Electroplating a metal object
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 33
Copper sulfate: inert and copper electrodes
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 34
Predicting aqueous halide electrode products
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 35
Hydrogen–oxygen fuel cells and useful electricity
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 36
Fuel cells compared with petrol engines
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 37
Exothermic and endothermic energy transfers
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 38
Enthalpy change and activation-energy diagrams
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 39
Bond breaking, bond making and enthalpy estimates
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 40
Physical and chemical changes: use particle identity
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 41
Reaction rate factors and catalysts
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 42
Measuring rates and reading reaction graphs
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 43
Collision theory and activation-barrier changes
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 44
Evaluating gas-volume and mass-loss rate methods
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 45
Reversible reactions and hydrated salts
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 46
Dynamic equilibrium and changing conditions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 47
The Haber process: ammonia and a practical compromise
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 48
The Contact process: sulfur trioxide and condition choices
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 49
Redox through oxygen transfer and Roman numerals
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 50
Electron transfer and oxidation-number changes
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 51
Oxidising agents, reducing agents and colour evidence
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 52
Acid reactions: choose the salt and the other products
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 53
Bases, alkalis and the neutralisation equation
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 54
Indicators and pH: compare aqueous solutions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 55
Proton transfer and strong versus weak acids
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 56
Acidic and basic oxides: connect behaviour with elements
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 57
Amphoteric oxides: reactions on both sides
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 58
Solubility rules: check the family and the exception
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 59
Soluble salts from excess insoluble reactants
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 60
Soluble salts from acid–alkali titration
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 61
Hydrated and anhydrous substances
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 62
Insoluble salts by precipitation
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 63
Water of crystallisation and hydrate formulas
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 64
Periodic position, outer electrons and ion predictions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 65
Reading supplied group trends without inventing exact values
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 66
Group I metals: trends and careful predictions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 67
Halogens: appearance, molecules and group trends
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 68
Halogen displacement: use the reactivity order
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 69
Transition elements: typical properties and catalyst roles
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 70
Variable oxidation numbers: iron(II) and iron(III)
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 71
Noble gases: full shells and separate atoms
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 72
Metal properties and reaction patterns
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 73
Choosing aluminium and copper for their uses
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 74
Alloys: composition, diagrams and useful properties
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 75
Why different-sized atoms can strengthen an alloy
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 76
The reactivity series: water, steam and dilute acid
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 77
Deducing reactivity from supplied experimental results
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 78
Metal displacement and positive-ion formation
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 79
Aluminium's oxide layer and apparent unreactivity
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 80
Rusting: required conditions and barrier methods
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 81
Galvanising and sacrificial protection
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 82
Choosing an extraction route from reactivity
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 83
The blast furnace: explain each material's role
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 84
Blast-furnace equations and oxygen accounting
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 85
Aluminium electrolysis: cryolite and changing carbon anodes
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 86
Testing for water: identify the colour change
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 87
Water purity and why laboratories use distilled water
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 88
Natural water: useful substances and harmful contamination
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 89
Domestic water treatment: give each stage its job
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 90
Fertilisers: ammonium salts, nitrates and NPK
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 91
Clean dry air: composition and approximate proportions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 92
Air pollutants: connect each source with its effect
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 93
Reducing climate change and acid-rain emissions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 94
Photosynthesis: reactants, products and light energy
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 95
The greenhouse effect: absorption, emission and energy balance
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 96
Engine nitrogen oxides and catalytic-converter reactions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 97
Photosynthesis: balance the symbol equation and quantities
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 98
Displayed formulas: show every atom and every bond
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 99
General formulas, functional groups and chemical families
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 100
Saturated and unsaturated: inspect carbon–carbon bonds
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 101
Structural formulas and structural isomers
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 102
Homologous series: successive members and physical trends
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 103
Fossil fuels, hydrocarbons and petroleum mixtures
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 104
Fractional distillation: temperature and petroleum trends
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 105
Petroleum fractions: match all eight required uses
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 106
Alkanes: single bonds, combustion and reaction limits
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 107
Chlorine substitution: ultraviolet light and one replacement
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 108
Alkenes and the aqueous bromine test
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 109
Cracking: smaller molecules, conditions and demand
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 110
Alkene addition: bromine, hydrogen and steam products
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 111
Ethanol from fermentation: glucose, yeast and conditions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 112
Ethanol from ethene: steam, pressure and acid catalyst
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 113
Ethanol combustion and its solvent and fuel uses
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 114
Compare fermentation and catalytic ethene hydration
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 115
Ethanoic acid reactions: name and formulate the salts
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 116
Oxidising ethanol to ethanoic acid and vinegar
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 117
Esterification: connect the acid and alcohol parts
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 118
Organic names and reaction products: read the complete structure
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 119
Four-carbon naming: double-bond and alcohol positions
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 120
Name and display esters from four-carbon starting molecules
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 121
Polymers and polyethene: many monomers, one long chain
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 122
Plastics: useful properties and disposal consequences
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 123
Addition repeats: deduce the monomer and retain side groups
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 124
Polyamides and nylon: monomers, links and water loss
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 125
Polyesters and PET: ester links and return to monomers
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 126
Proteins: amino acids and natural polyamide links
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 127
Choose measuring apparatus for the quantity and purpose
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 128
Design fair comparisons and evaluate measurement methods
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 129
Solution vocabulary and saturation at a stated temperature
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 130
Acid-base titration: aliquot, burette and endpoint
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 131
Burette readings, titres and comparable repeats
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 132
Paper chromatography: separate and compare coloured solutes
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 133
Colourless chromatography and retention-factor calculations
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 134
Select a solvent and filter an insoluble residue
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 135
Crystallisation: concentrate, cool and recover the solid
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 136
Distillation: collect a solvent and separate liquid mixtures
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 137
Melting and boiling data: identify and assess purity
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 138
Carbonate and halide tests: reagent then observation
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 139
Nitrate, sulfate and sulfite: distinguish three similar names
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 140
White cation precipitates and the separate ammonium gas test
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 141
Coloured cation precipitates: chromium, copper and iron
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 142
Gas identification: six tests and six specific observations
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 143
Flame tests: six metal-ion colours and contamination limits
Learn the method · Practise with help · Try it yourself · Apply the idea
Not started - 144
- 145
- 146
These checks record your study activity and self-assessment, not a mastery score. Check the course coverage map for available lessons and remaining topics.
Practise this subject
Topic tests: Easy, Normal and Difficult
Choose a topic, save your answers and compare your reasoning with worked models. See available tests and any coverage gaps.
Browse 49 topics →IGCSE Chemistry 0620 · Starter Paper
3 questions · 35 min · Timed practice