A Periodic Table of the Elements.
http://pearl1.lanl.gov/periodic
Maintained by the Los Alamos National Laboratory, this site provides basic information about chemical elements and the periodic table.
Chem4Kids.
http://www.chem4kids.com/
A brief overview of chemistry, the study of matter and how it changes and interacts with other matter. Covers matter, elements, atoms, reactions, and describes different types of chemistry ranging from biochemistry to physical chemistry.
Physics.org
http://www.physics.org/Physics_Life/Web/physics_life/life.asp
Did you know that physics is at work on the playground? Learn all about the science that surrounds us every day through a fun, interactive site.
Science Is Fun in the Lab of Shakhashiri
http://scifun.chem.wisc.edu/scifun.html
The master of chemical demonstrations, University of Wisconsin–Madison chemistry professor Bassam Z. Shakhashiri shares the fun of science through a chemical of the week and home science activities.
Strange Matter.
http://www.StrangeMatterExhibit.com
Find out what cell phones are made of, look at aluminum atoms, and much more! If you are interested in what things are made of, this is the site for you!