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  1. 1 7:49 Atoms & Ions | Protons, Neutrons, Electrons Cognito · 475.7K views
  2. 2 7:23 GCSE Chemistry – Elements, Isotopes & Relative Atomic Mass (2026/27 exams) Cognito · 262K views
  3. 3 6:21 GCSE Chemistry – Compounds, Molecules & Mixtures (2026/27 exams) Cognito · 153.2K views
  4. 4 6:24 GCSE Chemistry – Balancing Equations | Writing Word & Symbol Equations (2026/27 exams) Cognito · 197.6K views
  5. 5 5:19 GCSE Chemistry – Separation Techniques – Filtration | Evaporation | Crystallisation Cognito · 259.7K views
  6. 6 5:19 GCSE Chemistry – Distillation – Simple & Fractional Distillation (2026/27 exams) Cognito · 110K views
  7. 7 5:02 GCSE Chemistry – The History of the Atom | Models & Theories (2026/27 exams) Cognito · 160.5K views
  8. 8 6:51 GCSE Chemistry – Electronic Structure (2026/27 exams) Cognito · 106.4K views
  9. 9 6:07 GCSE Chemistry – Development of the Periodic Table (2026/27 exams) Cognito · 139.5K views
  10. 10 5:13 GCSE Chemistry – Metals & Non-metals: Electron Arrangement & Properties (2026/27 exams) Cognito · 123.9K views
  11. 11 6:20 GCSE Chemistry – Group 1 Elements – Alkali Metals | Properties | Reactivity (2026/27 exams) Cognito · 167.8K views
  12. 12 5:19 GCSE Chemistry – Group 7 & Group 0 Elements – Halogens & Noble Gases | Properties | Trends Cognito · 131.8K views
  13. 13 3:56 GCSE Chemistry – Formation of Ions – Electrons | Charge | Equations (2026/27 exams) Cognito · 112.6K views
  14. 14 4:39 GCSE Chemistry – Ionic Bonding – Formation | Dot and Cross Diagrams (2026/27 exams) Cognito · 315.3K views
  15. 15 6:32 GCSE Chemistry – Ionic Compounds – Structure | Properties | Formula (2026/27 exams) Cognito · 169.2K views
  16. 16 5:57 GCSE Chemistry – Covalent Bonding – Formation | Drawing Covalent Bonds (2026/27 exams) Cognito · 268K views
  17. 17 5:22 GCSE Chemistry – Types of Covalent Structures: Simple Molecular & Giant Covalent Structures Cognito · 142.4K views
  18. 18 3:47 GCSE Chemistry – Diamond & Graphite – Structure | Properties (2026/27 exams) Cognito · 141.6K views
  19. 19 3:34 GCSE Chemistry – Graphene & Fullerenes – Structure | Properties | Uses (2026/27 exams) Cognito · 75.2K views
  20. 20 3:59 GCSE Chemistry – Metallic Bonding – Properties of Metals | Alloys & Pure Metals (2026/27 exams) Cognito · 181.6K views
  21. 21 4:22 GCSE Chemistry – States of Matter & Changing State Cognito · 919.6K views
  22. 22 4:26 GCSE Chemistry – Nanoparticles – Uses | Risks (2026/27 exams) Cognito · 51.2K views
  23. 23 3:33 GCSE Chemistry – What is a Polymer? Polymers / Monomers / Their Properties Explained (2026/27 exams) Cognito · 746.6K views
  24. 24 4:31 GCSE Chemistry – Relative Formula Mass | Mr & Percentage Mass Calculations (2026/27 exams) Cognito · 114.8K views
  25. 25 4:53 GCSE Chemistry – Moles & Mass – Avogadro’s Constant | Formula for Moles, Mass & Mr (2026/27 exams) Cognito · 285.1K views
  26. 26 4:33 GCSE Chemistry – Conservation of Mass (2026/27 exams) Cognito · 64.7K views
  27. 27 4:45 GCSE Chemistry – Limiting Reactants & Balanced Equations (2026/27 exams) Cognito · 91.7K views
  28. 28 6:58 GCSE Chemistry – Gas Calculations – Volume & Moles | Mass, Moles & Mr (2026/27 exams) Cognito · 63.3K views
  29. 29 6:04 GCSE Chemistry – Moles, Concentration & Volume Calculations Cognito · 665.8K views
  30. 30 3:53 GCSE Chemistry – Concentration Calculations (grams per dm³) (2026/27 exams) Cognito · 48.2K views
  31. 31 5:21 GCSE Chemistry – Atom Economy – Calculations | Why it’s Important (2026/27 exams) Cognito · 34.2K views
  32. 32 2:59 GCSE Chemistry – State Symbols & Predicting States of Matter Cognito · 198.2K views
  33. 33 5:10 GCSE Chemistry – Percentage Yield – Theoretical & Actual Yield | Calculations (2026/27 exams) Cognito · 68.3K views
  34. 34 5:32 GCSE Chemistry – Acids & Bases – pH | Features | Neutralisation Reactions (2026/27 exams) Cognito · 248.1K views
  35. 35 5:40 GCSE Chemistry – Strong Acids & Weak Acids | pH & Concentration of Hydrogen Ions (2026/27 exams) Cognito · 94.5K views
  36. 36 5:05 GCSE Chemistry – Neutralisation Reactions | Reactions of Acids (2026/27 exams) Cognito · 103.6K views
  37. 37 4:28 GCSE Chemistry – The Reactivity Series – Metal Reactions | Displacement Reactions (2026/27 exams) Cognito · 144.4K views
  38. 38 4:40 GCSE Chemistry – Separating Metals from Metal Oxides | Extraction of Metals & Reduction Cognito · 77.8K views
  39. 39 5:19 GCSE Chemistry – Redox Reactions – Displacement Reactions | Ionic Equations | Half Equations Cognito · 212.9K views
  40. 40 4:20 Electrolysis Part 1/3 – Basics and Molten Compounds Cognito · 451.1K views
  41. 41 6:25 Electrolysis Part 2/3 – Electrolysis to Extract Metals From Oxides Cognito · 252.9K views
  42. 42 6:03 Electrolysis Part 3/3 – Aqueous Solutions Cognito · 222K views
  43. 43 5:48 GCSE Chemistry – Exothermic & Endothermic Reactions – Reaction Profiles | Activation Energy Cognito · 205.7K views
  44. 44 4:54 GCSE Chemistry – Bond Energies – Determining if Reactions are Exothermic or Endothermic Cognito · 95K views
  45. 45 7:44 GCSE Chemistry – Fuel Cells – Structure | How they Work | Half Equations | Pros & Cons Cognito · 110.8K views
  46. 46 5:02 GCSE Chemistry – Rates of Reaction – How to Measure it | How to Show it on Graphs (2026/27 exams) Cognito · 172K views
  47. 47 5:38 GCSE Chemistry – Factors Affecting Rate of Reaction & Collision Theory (2026/27 exams) Cognito · 134.1K views
  48. 48 6:35 GCSE Chemistry – Measuring Rates of Reaction from Graphs – Mean Rate & Rate at a Specific Time Cognito · 58.6K views
  49. 49 6:28 GCSE Chemistry – Reversible Reactions & Dynamic Equilibrium (2026/27 exams) Cognito · 174.5K views
  50. 50 4:13 GCSE Chemistry – Le Chatelier’s Principle – Position of Equilibrium in Reversible Reactions Cognito · 133K views
  51. 51 5:05 GCSE Chemistry – Hydrocarbons – Alkanes & Homologous Series (2026/27 exams) Cognito · 103.7K views
  52. 52 5:56 GCSE Chemistry – Alkanes – Properties & Combustion (2026/27 exams) Cognito · 75.9K views
  53. 53 5:35 GCSE Chemistry – Fractional Distillation – Crude Oil | Hydrocarbons (2026/27 exams) Cognito · 47.1K views
  54. 54 5:30 GCSE Chemistry – Crude Oil and Fractional Distillation Cognito · 987.6K views
  55. 55 6:41 GCSE Chemistry – Cracking & Alkenes – Catalytic & Steam Cracking | Equations (2026/27 exams) Cognito · 64.3K views
  56. 56 6:30 GCSE Chemistry – Cracking Crude Oil & Alkenes Cognito · 553K views
  57. 57 5:45 GCSE Chemistry – Addition Reactions of Alkenes Cognito · 535.2K views
  58. 58 7:11 GCSE Chemistry – Addition Polymers & Polymerisation (2026/27 exams) Cognito · 637.9K views
  59. 59 4:08 GCSE Chemistry – Alcohols Cognito · 416.5K views
  60. 60 3:05 GCSE Chemistry – Carboxylic Acids (2026/27 exams) Cognito · 408.9K views
  61. 61 2:02 GCSE Chemistry – Esters (2026/27 exams) Cognito · 483K views
  62. 62 5:19 GCSE Chemistry – Condensation Polymers (Polyesters) (2026/27 exams) Cognito · 572.9K views
  63. 63 5:52 GCSE Chemistry – Naturally Occurring Polymers – Polypeptides, DNA, and Carbohydrates (2026/27 exams) Cognito · 211.2K views
  64. 64 5:19 GCSE Chemistry – Purity & Formulations (2026/27 exams) Cognito · 28.7K views
  65. 65 6:33 GCSE Chemistry – Paper Chromatography Cognito · 1.4M views
  66. 66 4:01 GCSE Chemistry – Testing for Gases – Hydrogen/Chlorine/Oxygen/CO2 (2026/27 exams) Cognito · 51.8K views
  67. 67 4:50 GCSE Chemistry – Tests for Anions – Carbonate, Sulfate and Halide Ions (2026/27 exams) Cognito · 511.7K views
  68. 68 4:11 GCSE Chemistry – Flame Emission Spectroscopy (Flame Photometry) (2026/27 exams) Cognito · 214.2K views
  69. 69 5:12 GCSE Chemistry – Evolution of the Atmosphere | How the Atmosphere Changed Over Time (2026/27 exams) Cognito · 56.3K views
  70. 70 6:29 GCSE Chemistry – Greenhouse Gases & Climate Change (2026/27 exams) Cognito · 35.4K views
  71. 71 4:34 GCSE Chemistry – Carbon Footprints – Measuring Footprints | Reducing Emissions (2026/27 exams) Cognito · 16.2K views
  72. 72 4:36 GCSE Chemistry – Air Pollution – How Pollutants are Made | Why They’re Harmful (2026/27 exams) Cognito · 30K views
  73. 73 6:19 GCSE Chemistry – What is Corrosion and How to Stop it (2026/27 exams) Cognito · 353.2K views
  74. 74 4:21 GCSE Chemistry – Sustainable Development – Reuse & Recycling (2026/27 exams) Cognito · 15.8K views
  75. 75 6:10 GCSE Chemistry – Lifecycle Assessments (LCAs) – Stages | Examples | Limitations (2026/27 exams) Cognito · 21.3K views
  76. 76 5:15 GCSE Chemistry – Potable Water – Treating Freshwater | Desalinating Seawater (2026/27 exams) Cognito · 33.9K views
  77. 77 5:12 GCSE Chemistry – Waste Water Treatment – Sources of Waste Water | How to Treat it (2026/27 exams) Cognito · 30.7K views
  78. 78 5:37 GCSE Chemistry – The Haber Process Explained (2026/27 exams) Cognito · 632.4K views