Chem4Kids
Not just for kids, this colorful site provides a basic introduction to the science of chemistry, including matter, atoms, elements, reactions, biochemistry and much more.

CHEMINFO:Chemical Information Sources 
Continuously updated guide to educational, biographical and historical internet sites about chemistry.

Eric Weisstein's World of Chemistry
Formulas, explanations and diagrams include chemical reactions, experimental and quantum chemistry, organic and inorganic chemistry, mineralogy and petrology.

General Chemistry Online
Notes, guides, FAQs, databases and tutorials for a first semester chemistry course.

quizmeBC
Need a little help with chemistry 12? Try the quizWiz testing site which incorporates questions from the last two years of BC provincial exams.

Science Niche: Chemistry
This general chemistry site refers high school students and teachers to recommended websites, tutorials  and reviews about  chemical elements and experiments. including chemical databases and textbooks. 

VisualLearning: Chemistry
Online chemistry modules and tutorials for students covering atomic theory, biochemistry, chemical reactions, nuclear and organic chemistry, with links to online learning resources. Free registration is necessary to use the interactive portions of this site.

Online Chemistry Textbooks

Chemical Principles

Virtual Text of Organic Chemistry

...for help with school projects!