Khan Academy on a Stick
Chemistry
Videos on chemistry (roughly covering a first-year high school or college course).
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Introduction to the Atom (2 videos)
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Orbitals and Electrons (5 videos)
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Periodic table, trends, and bonding (5 videos)
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Chemical reactions (stoichiometry) (9 videos)
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Ideal gas laws (7 videos)
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States of matter (12 videos)
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Reaction rates (8 videos)
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Acids and bases (12 videos)
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Oxidation reduction (5 videos)
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Radioactive decay (5 videos)