GCSE · OCR
OCR GCSE J248 Chemistry
3 lessons out now for this course, 132 planned. Teachers: see the spec coverage.
Atomic structureCH013 of 5 out
- CH01-02Protons, neutrons and electrons8 min
- CH01-03How big an atom is9 min
- CH01-04Atomic number, mass number and isotopes8 min
- CH01-06Electronic structure of the first twenty elementsComing soon
- CH01-07How the model of the atom changedComing soon
The periodic tableCH020 of 9 out
- CH02-01The periodic table: groups, periods and positionComing soon
- CH02-02How the periodic table was developedComing soon
- CH02-03Metals and non-metalsComing soon
- CH02-04Group 1: the alkali metalsComing soon
- CH02-05Group 7: the halogensComing soon
- CH02-06Halogen displacement reactionsComing soon
- CH02-07Group 0: the noble gasesComing soon
- CH02-08Predicting an element's reactions from its positionComing soon
- CH02-09The transition metals (triple)Coming soon
States of matter and separating mixturesCH030 of 6 out
- CH03-01The three states of matter and the particle modelComing soon
- CH03-02The limits of the simple particle model (Higher) Higher_Only tierComing soon
- CH03-03Mixtures, and choosing a separation techniqueComing soon
- CH03-04Pure substances, and spotting an impurity from a melting pointComing soon
- CH03-05FormulationsComing soon
- CH03-06Chromatography and Rf valuesComing soon
Bonding: ionic, covalent and metallicCH040 of 6 out
- CH04-01The three types of strong bond, and spotting each structureComing soon
- CH04-02Ionic bonding and dot-and-cross diagramsComing soon
- CH04-03The ionic latticeComing soon
- CH04-04Covalent bonding and dot-and-cross for small moleculesComing soon
- CH04-05Metallic bondingComing soon
- CH04-06What our models of structure leave outComing soon
Structure and the properties of materialsCH050 of 10 out
- CH05-01Predicting a substance's state from its bondingComing soon
- CH05-02Why ionic compounds melt high and conduct when moltenComing soon
- CH05-03Why small molecules melt low and do not conductComing soon
- CH05-04Polymers: recognising one, and why polymers are solidsComing soon
- CH05-05Diamond and silicon dioxide: giant covalent structuresComing soon
- CH05-06Graphite: why it is soft and why it conductsComing soon
- CH05-07Graphene, fullerenes and carbon nanotubesComing soon
- CH05-08Why metals conduct and bend, and why an alloy is harderComing soon
- CH05-09Nanoparticles: size and the surface area to volume ratio (triple)Coming soon
- CH05-10Nanoparticles: what they are used for and the risks (triple)Coming soon
Chemical formulae and equationsCH060 of 6 out
- CH06-01Writing formulae, and word and symbol equationsComing soon
- CH06-02Deducing a formula from its ionsComing soon
- CH06-03Conservation of mass, and balancing a symbol equationComing soon
- CH06-04State symbols in chemical equationsComing soon
- CH06-05Why the mass seems to change when a gas is involvedComing soon
- CH06-06Writing balanced ionic equations (Higher) Higher_Only tierComing soon
Relative mass, moles and reacting massesCH070 of 7 out
- CH07-01Relative formula mass, and percentage by massComing soon
- CH07-02Empirical formulaComing soon
- CH07-03Concentration of a solution in grams per dm3Coming soon
- CH07-04The mole and the Avogadro constant (Higher) Higher_Only tierComing soon
- CH07-05Calculating a mass from a balanced equationComing soon
- CH07-06Using masses to deduce the stoichiometry of an equation (Higher) Higher_Only tierComing soon
- CH07-07Limiting reactants (Higher) Higher_Only tierComing soon
Concentration, yield and atom economyCH080 of 4 out
- CH08-01Concentration in moles per dm3 (triple, Higher) Higher_Only tierComing soon
- CH08-02The molar gas volume (triple, Higher) Higher_Only tierComing soon
- CH08-03Percentage yield, and the theoretical mass of a product (triple)Coming soon
- CH08-04Atom economy (triple)Coming soon
Acids, bases and saltsCH090 of 7 out
- CH09-01Acids, alkalis and the pH scaleComing soon
- CH09-02Neutralisation, and the salts that acids makeComing soon
- CH09-03Acids reacting with metalsComing soon
- CH09-06Titration: the techniqueComing soon
- CH09-07Strong and weak acids, dilute and concentrated (Higher) Higher_Only tierComing soon
- CH09-08pH, hydrogen ion concentration and the tenfold rule (Higher) Higher_Only tierComing soon
- CH09-09Titration calculations (triple, Higher) Higher_Only tierComing soon
Metals and the reactivity seriesCH100 of 7 out
- CH10-01Oxidation and reduction in terms of oxygenComing soon
- CH10-02The reactivity seriesComing soon
- CH10-03Extracting a metal from its oreComing soon
- CH10-04Oxidation and reduction as electron transfer (Higher) Higher_Only tierComing soon
- CH10-05Biological methods of extracting metals (Higher) Higher_Only tierComing soon
- CH10-06Corrosion, preventing rust, and electroplating (triple)Coming soon
- CH10-07Alloys: why alloying works, and the common alloys (triple)Coming soon
ElectrolysisCH110 of 6 out
- CH11-01What electrolysis is: electrolytes, ions and electrodesComing soon
- CH11-02Electrolysis of a molten ionic compoundComing soon
- CH11-03Electrolysis of aqueous solutionsComing soon
- CH11-04Electrolysis with non-inert electrodes: purifying copperComing soon
- CH11-05Extracting aluminium by electrolysisComing soon
- CH11-06Half equations at the electrodes (Higher) Higher_Only tierComing soon
Energy changes in reactionsCH120 of 6 out
- CH12-01Exothermic and endothermic reactionsComing soon
- CH12-02Reaction profiles and activation energyComing soon
- CH12-03Breaking bonds costs energy, making bonds releases itComing soon
- CH12-04Calculating an energy change from bond energies (Higher) Higher_Only tierComing soon
- CH12-05Chemical cells and batteries (triple)Coming soon
- CH12-06Fuel cells (triple)Coming soon
Rates of reactionCH130 of 4 out
- CH13-01Measuring and calculating the rate of a reactionComing soon
- CH13-02Rate at a specific time: the gradient of a tangentComing soon
- CH13-03The factors that change the rate, and collision theoryComing soon
- CH13-04CatalystsComing soon
Reversible reactions and equilibriumCH140 of 7 out
- CH14-01Reversible reactions and dynamic equilibriumComing soon
- CH14-02Le Chatelier's principle, and changing the concentration (Higher) Higher_Only tierComing soon
- CH14-03Changing the temperature and the pressure on an equilibrium (Higher) Higher_Only tierComing soon
- CH14-04The Haber processComing soon
- CH14-05Industrial conditions: the trade-off between rate, yield and cost (triple, Higher) Higher_Only tierComing soon
- CH14-06Choosing a reaction pathway for an industrial product (triple, Higher) Higher_Only tierComing soon
- CH14-07Fertilisers: NPK, in the laboratory and in industry (triple)Coming soon
Crude oil, fuels and combustionCH150 of 9 out
- CH15-01Why carbon forms so many compoundsComing soon
- CH15-02Crude oil: what it is and where it comes fromComing soon
- CH15-03Fractional distillation, and what the fractions are used forComing soon
- CH15-04How a hydrocarbon's properties change with chain lengthComing soon
- CH15-05Homologous series and functional groupsComing soon
- CH15-06CrackingComing soon
- CH15-07Complete combustion of a hydrocarbonComing soon
- CH15-08Incomplete combustion, and the pollutants a fuel gives offComing soon
- CH15-09What the atmospheric pollutants actually doComing soon
Alkenes, alcohols and carboxylic acidsCH160 of 5 out
- CH16-01Alkenes and the carbon-carbon double bond (triple)Coming soon
- CH16-02Reactions of the alkenes, and the bromine water test (triple)Coming soon
- CH16-03Alcohols (triple)Coming soon
- CH16-05Carboxylic acids (triple)Coming soon
- CH16-06Oxidising an alcohol, and predicting from the functional group (triple)Coming soon
PolymersCH170 of 3 out
- CH17-01Addition polymerisation (triple)Coming soon
- CH17-02Condensation polymerisation (triple, Higher) Higher_Only tierComing soon
- CH17-04The natural polymers: DNA, starch, cellulose and proteins (triple)Coming soon
Chemical analysis and identifying ionsCH180 of 6 out
- CH18-01The tests for hydrogen, oxygen, carbon dioxide and chlorineComing soon
- CH18-02Flame tests (triple)Coming soon
- CH18-03Identifying metal ions with sodium hydroxide solution (triple)Coming soon
- CH18-04Identifying the anions: carbonate, halide and sulfate (triple)Coming soon
- CH18-05Identifying an unknown salt from its test results (triple)Coming soon
- CH18-06Instrumental methods of analysis (triple)Coming soon
The atmosphere and climate changeCH190 of 4 out
- CH19-01The atmosphere today, and the Earth's early atmosphereComing soon
- CH19-03The greenhouse effectComing soon
- CH19-04Human activity, climate change, and how good the evidence isComing soon
- CH19-05The carbon footprint and how to reduce itComing soon
Using the Earth's resourcesCH200 of 6 out
- CH20-02Potable waterComing soon
- CH20-03Treating waste waterComing soon
- CH20-04Reducing, reusing and recyclingComing soon
- CH20-05Life cycle assessmentComing soon
- CH20-07Glass and clay ceramics (triple)Coming soon
- CH20-08Polymers, composites and choosing the right material (triple)Coming soon
Practical skills and required practicalsCH210 of 9 out
- CH21-03Practical: separating and identifying the dyes in an inkComing soon
- CH21-05Practical: making a pure, dry sample of a soluble saltComing soon
- CH21-06Practical: how the pH changes as a base is added to an acidComing soon
- CH21-07Practical: electrolysis of aqueous solutionsComing soon
- CH21-08Practical: temperature changes in reacting solutionsComing soon
- CH21-09Practical: how concentration affects the rate of a reactionComing soon
- CH21-11Practical: acid-alkali titration (triple)Coming soon
- CH21-12Practical: identifying the ions in an unknown compound (triple)Coming soon
- CH21-13Practical: finding a reactivity trend (triple)Coming soon