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This is a collection of search tools created by the US National Library of Medicine. The search results may include entries in a variety of chemical databases in the National Center for Biotechnology Information or to research articles in PubMed.
At first glance, this seems to be just a web version of the periodic table. However, if you explore the navigation tools, you can find lots of information about the physical properties of individual elements, as well as interactions with other elements and the natural world in general. From the University of Sheffield.
Chemical Education Digital Library
There are lots of resources for learning chemistry on this site, including a periodic table (click on element to retrieve extensive background material), a collection of molecular structures, and a chemistry textbook. Note: Your Java must be up-to-date, and some parts of the site will not work with Internet Explorer.
PhET Interactive Simulations
Explore general chemistry principles while interacting with these activities. From the University of Colorado, Boulder.
This is an online textbook created by Dr. Henry Jakubowski for his first-year biochem students at St. John's University. You won't be able to access the supplementary materials, but the book is free to read.
Biochemistry Problem Sets and Tutorials
From the Biology Project, University of Arizona.
Part of the WebAnatomy site from the University of Minnesota.
Activities and Entertainments
PDB-101 : Protein Data Bank
Having trouble visualising the 3-D structure of DNA? Print out and put together this model to get a better picture. Then explore the entire PDB website for lots of information about proteins.
American Chemistry Society Green Chemistry Portal
News and information about environmentally friendly chemistry.
The Chemistry Department at the University of Nottingham has produced this series of videos, one for each element. There is some other fun information on the site as well.
Periodic Table Interactive
Learn how to "read" the periodic table, with activities to test your understanding. From the Annenberg Foundation.