ChemTeam a review of high school chemistry, divided into topics such as atomic structure, equations and reaction types, the mole, and nomenclature. A great site to find answers to any science-based question. Users can go to the topic of choice or choose the systematically designed guided tour. A useful Math section deals with what units chemists use, the constants used in Chemistry and how to use symbols and formulae. The site also contains brief profiles of the heroes of Chemistry and a comprehensive chemistry Glossary.
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Each topic has a great on-line quiz. A Tutorial for High School Chemistry. A virtual chemistry textbook developed to provide an interactive guide for high school chemistry students.