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OCR GCSE Chemistry

OCR Chemistry A (J248)6 topics149 lessons

OCR GCSE Chemistry revision for OCR Chemistry A (J248): 6 topics and 149 short lessons, each with R.E.C.I.P.E. recall steps and a quiz. The topics follow the OCR specification.

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1. Particles

8 lessons

  1. The particle model and states of matter
  2. Physical changes and chemical changes
  3. Limitations of the particle model
  4. Changing models of the atom
  5. The nuclear atom
  6. Size and scale of atoms
  7. Protons, neutrons and electrons
  8. Atomic number, mass number and isotopes

2. Elements, compounds and mixtures

30 lessons

  1. Purity of a substance
  2. Melting point and purity
  3. Relative formula mass
  4. Empirical formulae
  5. Formulations and alloys
  6. Separating mixtures
  7. Paper and thin layer chromatography
  8. Stationary and mobile phases
  9. Interpreting chromatograms and Rf values
  10. Choosing a purification technique
  11. Using chromatography to test purity and identify substances
  12. Metals and non-metals
  13. Atomic structure and position in the Periodic Table
  14. Electron arrangement and the Periodic Table
  15. Ionic, simple molecular and giant covalent bonding
  16. Electrostatic forces, transfer and sharing of electrons
  17. Dot and cross diagrams
  18. Limitations of bonding models
  19. Electron arrangement and the reactions of elements
  20. From Mendeleev's table to the modern Periodic Table
  21. Carbon forms four covalent bonds
  22. Carbon compounds: chains, rings and families
  23. Diamond, graphite, fullerenes and graphene
  24. Energy, bonds and changes of state
  25. Using data to predict states of substances
  26. Bulk properties of materials
  27. Nano dimensions compared with atoms and molecules
  28. Surface area to volume ratio and properties
  29. Properties and uses of nanoparticulate materials
  30. Risks of nanoparticulate materials

3. Chemical reactions

32 lessons

  1. Formulae of elements and simple compounds
  2. Balanced chemical equations
  3. Using the Periodic Table to write equations
  4. Deducing formulae from ions
  5. Balanced ionic equations
  6. State symbols
  7. The Avogadro constant and the mole
  8. Mass and amount in moles
  9. The law of conservation of mass
  10. Changes in mass in non-enclosed systems
  11. Stoichiometry and limiting reactants
  12. Calculating masses from balanced equations
  13. Distinguish between endothermic and exothermic reactions on the basis of the temperature change of the surroundings
  14. Draw and label a reaction profile for an exothermic and an endothermic reaction
  15. Explain activation energy as the energy needed for a reaction to occur
  16. Calculate energy changes in a chemical reaction by considering bond making and bond breaking energies
  17. Oxidation and reduction as gain or loss of oxygen
  18. Oxidation and reduction as loss or gain of electrons
  19. Hydrogen ions and hydroxide ions
  20. Neutralisation and making a pure dry salt
  21. Neutralisation as hydrogen ions reacting with hydroxide ions
  22. Reactions of acids with metals and carbonates
  23. Dilute, concentrated, weak and strong acids
  24. Measuring acidity and alkalinity with pH
  25. pH, neutrality and hydrogen ion concentration
  26. Each pH unit is a factor of ten
  27. Measuring pH with universal indicator and pH meters
  28. Products at the electrodes and the terms cations and anions
  29. Predicting products of electrolysis of molten binary compounds
  30. Electrolysis of aqueous solutions: competing reactions
  31. Ions and half equations at the electrodes
  32. Electrolysis with inert and non-inert electrodes

4. Predicting and identifying reactions

13 lessons

  1. Properties of Groups 1, 7 and 0
  2. Group properties and outer shell electrons
  3. Transition metals and their compounds
  4. Predicting reactions from the Periodic Table
  5. Reactivity of metals with water and acids
  6. Deducing an order of reactivity
  7. Tests for gases
  8. Tests for aqueous cations and anions
  9. Carrying out a flame test
  10. Identifying species from test results
  11. Interpreting flame tests
  12. Advantages of instrumental methods of analysis
  13. Interpreting instrumental results

5. Monitoring and controlling chemical reactions

23 lessons

  1. Concentration in mol/dm3 from mass and volume
  2. Carrying out an acid-alkali titration
  3. Titration calculations
  4. Moles and the volumes of gases
  5. Calculating gas volumes in reactions
  6. Concentration in g/dm3 from mass and volume
  7. Calculating the theoretical mass of a product
  8. Calculating percentage yield
  9. Defining atom economy
  10. Calculating atom economy
  11. Choosing a reaction pathway
  12. Practical methods for finding the rate of a reaction
  13. Interpreting rate of reaction graphs
  14. Factors that change the rate of a reaction
  15. Collision theory and the rate of reaction
  16. Surface area to volume ratio and rate
  17. Catalysts
  18. Identifying catalysts in reactions
  19. Catalysts and activation energy
  20. Enzymes as biological catalysts
  21. Reversible reactions and altering conditions
  22. Dynamic equilibrium
  23. Le Chatelier's principle and equilibrium position

6. Global challenges

43 lessons

  1. Extracting metals using carbon
  2. Extracting metals by electrolysis
  3. Biological methods of metal extraction
  4. Rate against equilibrium position
  5. Interpreting graphs of reaction conditions
  6. Choosing industrial conditions
  7. Importance of the Haber process in agriculture
  8. Industrial and laboratory production of fertilisers
  9. Nitrogen, phosphorus and potassium in agriculture
  10. Industrial production of fertilisers
  11. Principles of a life-cycle assessment
  12. Interpreting life-cycle assessment data
  13. Recycling a material for a different use
  14. Factors affecting decisions on recycling
  15. Alloys and their uses
  16. Corrosion of iron and other metals
  17. Preventing corrosion
  18. Comparing the properties of materials
  19. Properties of materials and their uses
  20. Functional groups and homologous series
  21. Naming and drawing the first four members
  22. Reactions of alkanes, alkenes and alcohols
  23. Addition polymerisation
  24. Condensation polymerisation
  25. Making nylon in the laboratory
  26. Addition polymers and their monomers
  27. DNA and other natural polymers
  28. Functional groups and their reactions
  29. Fractional distillation of crude oil
  30. Why fractional distillation works
  31. Alkanes in the fractions
  32. Crude oil as a source of hydrocarbons and a feedstock
  33. Dependence on hydrocarbons and finite crude oil
  34. Cracking of hydrocarbons
  35. Chemical cells and potential difference
  36. Hydrogen fuel cells and other fuel cells
  37. How the early atmosphere formed
  38. How an oxygen-rich atmosphere developed
  39. The greenhouse effect
  40. Human causes of climate change and the evidence
  41. Effects of carbon dioxide and methane, and how to reduce them
  42. Atmospheric pollutants and the problems they cause
  43. Methods for increasing the availability of potable water