Chemistry

Chemical Elements.com
An interactive periodic table with detailed but easy to understand information.
http://www.chemicalelements.com/

A Level Chemistry
Contains teachers notes and quizzes on each topic of the A Level Chemistry course, as well as help forums.
http://www.alevelchemistry.co.uk/

S - Cool Chemistry revision
Provides revision and teaching materials for both GCSE and A Level standard. The site also contains exam hints and tips.
http://www.s-cool.co.uk/topic_index.asp?subject_id=7&d=0