This is a partial list of links. Our library also maintains an excellent list of chemistry links.
"Chemistry Behind Cleaning"
A great new link from Ms. Britton's Class in Grand Prarie, Texas. Thanks!
Periodic Table Resource: Tungsten, Palladium and Other Transition Metals
an excellent link describing the properties and uses of Transition Metals recommended by Mrs. McVey and her 6th graders.
The home page for the American Chemical Society. A good source of information regarding a wide range of topics in chemistry. There is a section on Careers in Chemistry, though it is somewhat limited.
The home page for the International Union for Pure and Applied Chemistry. IUPAC is the rule making body for nomenclature and other aspects affecting publication of information in chemistry. http://www.iupac.org/dhtml_home.html
This site has links to a wide variety of chemistry resources on the web. It is well maintained and can lead you to the answers to many questions. http://www.chemdex.org/
You can look up properties of any of the chemical elements from this site. There are also pictures of the elements and information on how the elements are used. http://www.webelements.com/
There are links to an incredible variety of periodic tables, including periodic tables in other languages. http://chemlab.pc.maricopa.edu/periodic/periodic.html
Combinatorial Chemistry: http://www.combichemistry.com/