Frostburg State University
General Chemistry Online: Molecules and Compounds
A complete lesson on compounds, from introductory material in the beginning to a practice exam at the end. This lesson covers bonding, ionic compounds, molecular compounds, naming compounds, structural formulas, polyatomic ions, and much...
Royal Society of Chemistry
Royal Society of Chemistry: Gridlocks: Level 3
A collection of grid puzzles that cover a wide variety of topics in advanced high school chemistry. These are excellent for topic review and reinforcement. The puzzles can be played online and also downloaded as worksheets. Answers are...
Environmental Chemistry
Evironmental chemistry.com: Periodic Table Argon
A very extensive sight on argon. Well organized and extremely helpful.
Environmental Chemistry
Environmental chemistry.com: Periodic Table Radon
Great site for all sorts of information on radon. Very thorough and well organized. Highly recommended.