Chemistry
a weird site with lots of chemistry links
Try out these quizzes
http://www.sciencequiz.net/lcchemistry/index.html
Core 1. Periodic Table and Atomic Structure 2. Chemical Bonding 3. Stoichiometry, Formulas and Equations
4. Volumetric Analysis
5. Fuels and Heats of Reaction 6. Rates of Reaction 7. Organic Chemistry 8. Chemical Equilibrium 9. Environmental Chemistry: Water
Higher Level: Option 1 1A. Additional Industrial Chemistry 1B. Atmospheric Chemistry
Higher Level: Option 2 2A. Materials 2B. Additional Electrochemistry and the Extraction of Metals
A whole series of online lectures at
http://khanexercises.appspot.com/video?v=1xSQlwWGT8M#166048DD75B05C0D