What is Chemistry?
An overview of the diverse field of chemistry from the Microsoft Encarta Encyclopedia.

Chemistry Explained
This site has excellent introductory articles about different areas in chemistry, such as forensic chemistry, and there are also articles about the elements and specific compounds.  From Thomson Gale, a part of the Thomson Corporation.

WebElements
The online periodic table!  This site has the most up to date information about the known elements, such as atomic weights and other physical properties, pictures, videos, and lots more.  J. Fromm's History of the Development of the Periodic Table can be found here, and an early table of Mendeleev's is here.  Another brief history is here.

American Elements
"The American Elements website has been a source for academic investigation and research for over a decade.  Our fundamental expertise in the properties, applications, and cost-effective manufacturing of advanced and engineered materials."  Browse this extensive website to find information about the elements and their compounds, nanomaterials, and other interesting topics.

Elementymology & Elements Multidict
"This is THE web site for element names. You will find this site useful not only for the origins (etymology) of element names, but also for translations of each element name into numerous other languages."  By Peter van der Krogt.

The History of Chemistry
Created by Woodrow Wilson Summer Institute participants, this site concentrates on the achievements of chemists from the 19th and early 20th century (Lynn Willis, ACS).  See also People and Discoveries, a collection of 120 articles about 20th century scientists and their stories, from PBS Online.

Historical Biographies
The MacTutor History of Mathematics Archive - A huge collection of biographies of mathematicians, scientists and philosophers from 500 BC to the present!  Not specific for chemistry, but is nevertheless a very useful collection.  The alphabetical index may be accessed here.  For biographies of famous chemists and other scientists, see Alan J. Jircitano's collection here and C. Baskar's collection of "Great Minds" here.

Classic Chemistry
This site presents classic papers from Aristotle to Zeeman, very interesting reading about the history of chemistry in the words of the individuals who made it. Compiled by Carmen Giunta, Le Moyne College.

Antoine Laurent Lavoisier
This page tells about the life and work of the "Father of Modern Chemistry." Some pictures are missing and links outdated, but is still worthwhile reading.

Who "Invented" the Atom?
This page introduces you to the scientists that were involved with developing the atomic theory and the image of the atom we now have. By Diane Lunaburg, South Cobb High School.

Quantum Theory Comes of Age
Take Dan Thomas' tour of the history of the development of the quantum mechanical model of the atom and of the various personalities that achieved this remarkable goal. See also Michael Fowler's detailed look at the Bohr model of the atom here.

Nobelprize.org
"Since 1901, the Nobel Prize has been given to people who have achieved great things in chemistry, physics, medicine, literature, and peace (an award for economics was added in 1968). The chemistry section of the Nobel site has interesting facts about all Nobel prize winners (also called Nobel laureates) in chemistry through press releases, biographies, Nobel lectures, and interviews." (Lynn Willis, ACS).  See also the Encyclopedia Britannica's Guide to the Nobel Prizes here.

The Allotropes of Carbon
An interesting introduction to the element carbon from IN-VSEE.

Some Notes on Avogadro's Number, 6.022 x 10²³
By T.A. Furtsch, Tennessee Technological University.  The Wikipedia article about the mole is here.

Acid and Base pH Tutorial
This site contains notes and self directed exercises designed to help students with the fundamental concepts of acid-base chemistry. The level of instruction is aimed at first year university students with no prior knowledge of acid-base chemistry.

Lewis Dot Structures
An introduction to drawing atoms, ions, and molecules using the dot structure convention to represent valence electrons. A brief outline of the general procedure can also be found here.

Molecular Structure Tutorial
This tutorial is very good. First you give the correct angles around the central atom that occur in the main geometries, then choose from 15 molecules and ions and a) choose the correct dot structure, b) give the number of sigma bonds and lone pairs, c) give the overall geometry, d) give the molecular geometry, and e) tell if the molecule is polar or nonpolar. Requires Chime and Shockwave; try the tutorial first to see if you need to download either of these.

Molecular Geometries
Examine basic molecular geometries using Chime, a browser plug-in that lets you rotate molecules and do other manipulations for better viewing. For VSEPR theory of molecular geometry there is a good site here from the University of Oregon, and a detailed ChemTeam site is here.

The Elements of the Periodic Table
Detailed descriptions of many elements, organized by group (IA-VIIIA, IIIB). Interesting reading!

The Noble Gases
From "The Elements of the Periodic Table." Interesting descriptions of the noble gases He, Ne, Ar, Kr, Xe, and Rn. For a short article describing the first "stable" compound of argon, go here.

Chemistry Exercises with Java Applets
Lots of 'em!  By David N. Blauch, Davidson College. Requires the Java Runtime Environment which can be downloaded here.

Glossary of Chemical Terms
Chemistry terms and definitions. The glossary can be browsed or searched.  From General Chemistry Online, by Fred Senese, Frostburg State University.