Khan Academy for Prelim and HSC Chemistry

The Khan Academy is an online educational resource with short (up to 10 minute) lectures on different topics. Below are the Khan Academy videos relevant to Preliminary & HSC Chemistry.

So - if you didn't quite get something in the last two years   and you want it explained again,
Or - if you want some extra worked examples for moles (see the Metals unit),
Or - you want to hear things explained in a new way,

I recommend you watch the videos below.

But please, no matter how well-intentioned, please don't say "Thanks, I never understood xxxxx before - but now I do thanks to those videos" - even though I will be really happy for you, my professional pride will be wounded.

THE CHEMICAL EARTH

1. Elements and Atoms
2. Introduction to the atom
3. Orbitals
4. More on orbitals and electron configuration
5. Electron Configurations
6. Electron Configurations 2
7. Valence Electrons
8. States of Matter
9. States of Matter Follow-Up
10. Covalent Networks, Metallic, and Ionic Crystals

METALS

11. Groups of the Periodic Table
12. Periodic Table Trends: Ionization Energy
13. Other Periodic Table Trends
14. Ionic, Covalent, and Metallic Bonds
15. Molecular and Empirical Formulas
16. The Mole and Avogadro's Number
17. Formula from Mass Composition
18. Another mass composition problem
19. Balancing Chemical Equations
20. Stoichiometry
21. Stoichiometry: Limiting Reagent
22. Stoichiometry Example Problem 1
23. Stoichiometry Example Problem 2
24. Limiting Reactant Example Problem 1
25. Empirical and Molecular Formulas from Stoichiometry
26. Example of Finding Reactant Empirical Formula
27. Molecular and Empirical Forumlas from Percent Composition

WATER

28. Stoichiometry of a Reaction in Solution
29. Another Stoichiometry Example in a Solution
30. Van Der Waals Forces
31. Solubility
32. Boiling Point Elevation and Freezing Point Supression

ENERGY

33. Introduction to Kinetics
34. Reactions in Equilibrium
35. Enthalpy
36. Heat of Formation
37. Hess's Law and Reaction Enthalpy Change

PRODUCTION OF MATERIALS

38. Enthalpy
39. Introduction to Oxidation States
40. More on Oxidation States
41. Redox Reactions
42. Galvanic Cells
43. Types of Decay
44. Half-Life

THE ACIDIC ENVIRONMENT

45. Le Chatelier's Principle
46. Introduction to pH, pOH, and pKw
47. Acid Base Introduction
48. pH, pOH of Strong Acids and Bases
49. pH of a Weak Acid
50. pH of a Weak Base
51. Conjugate Acids and Bases
52. Buffers and Hendersen-Hasselbalch
53. Acid Base Titration
54. Strong Acid Titration
55. Weak Acid Titration
56. Titration Roundup

CHEMICAL MONITORING AND MANAGEMENT

57. Spectrophotometry Introduction
58. Spectrophotometry Example
59. Introduction to Kinetics
60. Reactions in Equilibrium
61. Le Chatelier's Principle