Types of Chemical Reactions

50 lessons, pages 671–720.

  1. Why Classify Chemical Reactions? — Sorting reactions into patterns to predict products
  2. Evidence That a Reaction Has Happened — Colour change, gas, precipitate, energy change
  3. The Main Reaction Types at a Glance — Combination, decomposition, displacement and double displacement
  4. General Patterns: A + B → AB and Its Relatives — Using letter templates to recognise reaction types
  5. Combination Reactions: The Basic Idea — Two or more reactants forming a single product
  6. Element Plus Element Combinations — Metals with non-metals and non-metals with each other
  7. Metals Burning in Oxygen — Forming basic metal oxides such as MgO
  8. Non-metals Combining with Oxygen — Carbon, sulfur and hydrogen forming oxides
  9. Compound Plus Element Combinations — CO to CO₂ and SO₂ to SO₃
  10. Compound Plus Compound Combinations — CaO with H₂O or CO₂, and NH₃ with HCl
  11. Oxides and Water: Forming Acids and Bases — Acidic and basic oxides combining with water
  12. Energy Changes in Combination Reactions — Why most combinations are exothermic
  13. Combination Reactions in Industry and Daily Life — Ammonia synthesis, slaking lime and rusting
  14. Predicting Products of Combination Reactions — Using valency and ion charges to write formulae
  15. Decomposition Reactions: The Basic Idea — One reactant breaking into two or more products
  16. Why Decomposition Usually Needs Energy — Bond breaking and endothermic change
  17. Thermal Decomposition of Carbonates — Limestone to quicklime and carbon dioxide
  18. Thermal Decomposition of Hydroxides and Nitrates — Patterns in products and thermal stability
  19. Electrolytic Decomposition of Water — Using electricity to split H₂O into H₂ and O₂
  20. Electrolysis of Molten Salts — Decomposing ionic compounds into their elements
  21. Photolytic Decomposition — Light-driven breakdown such as silver halides
  22. Catalysed Decomposition of Hydrogen Peroxide — Speeding up decomposition without being used up
  23. Decomposition in Everyday Life — Baking soda, cement kilns and food spoilage
  24. Combination and Decomposition as Opposites — Reverse reactions and energy bookkeeping
  25. Predicting Products of Decomposition Reactions — Recognising common breakdown patterns
  26. Displacement Reactions: The Basic Idea — A more reactive element replacing a less reactive one
  27. The Reactivity Series of Metals — Ranking metals by how readily they react
  28. Metals Displacing Metals from Solution — Iron in copper sulfate and similar reactions
  29. Metals Reacting with Water — Displacing hydrogen from water and steam
  30. Metals Reacting with Dilute Acids — Displacing hydrogen to form salts
  31. Displacing Metals from Their Oxides — Carbon and reactive metals as reducing agents
  32. Halogen Displacement Reactions — Reactivity order of chlorine, bromine and iodine
  33. Displacement as Electron Transfer — Oxidation and reduction in displacement
  34. Ionic Equations for Displacement Reactions — Showing only the species that change
  35. Displacement in Metal Extraction and Corrosion Protection — Sacrificial protection and galvanising
  36. Predicting Whether Displacement Will Occur — Applying reactivity series to new cases
  37. Double Displacement Reactions: The Basic Idea — Two compounds exchanging partner ions
  38. Solubility Rules for Ionic Compounds — Which salts dissolve and which do not
  39. Precipitation Reactions — Forming an insoluble solid from two solutions
  40. Spectator Ions and Net Ionic Equations — Removing ions that do not take part
  41. Neutralisation as Double Displacement — Acid plus base forming salt and water
  42. Double Displacement That Produces a Gas — Carbonates and acids releasing CO₂
  43. Using Precipitates to Identify Ions — Tests for halide, sulfate and metal ions
  44. Double Displacement in Water Treatment and Industry — Removing hardness and making insoluble salts
  45. Predicting Products of Double Displacement — Swapping ions and checking the driving force
  46. Redox and Non-redox Reactions Across the Types — Which reaction types involve electron transfer
  47. Classifying Unfamiliar Reactions — Combustion, overlapping categories and borderline cases
  48. Balancing Equations Across Reaction Types — Applying conservation of atoms to each pattern
  49. Reaction Types in Everyday Chemistry: Case Studies — Cooking, cleaning, batteries and the environment
  50. Types of Chemical Reactions: Unit Review — Bringing together all four reaction types