Unit 8 - Topic 2 (Organic Chemistry Introduction - Hydrocarbons)
Fractional Distillation
Isomers - Tutorial
Richard Thornley does Nomenclature
Topic 3 - Bond Polarity
Topic 4 - Polarity in Molecules (Symmetry vs. Asymmetry)
Topic 5 - Intermolecular Forces
I think this video (below) is slightly more technical, but still really good if you want some additional examples and explanations.