Beckworth R. (1996-1999). Chemical Bonding Information. Retrieved January 9, 2006, from http://users.senet.com.au/~rowanb/chem/chembond.html .

Bowles R. (N.D.). Balancing Chemical Equations. Retrieved December 6, 2005, from http://richardbowles.tripod.com/chemistry/balance.htm .

Capri, A. (2003- 2006). Vision Learning. Retrieved December 5, 2005, from http://www.visionlearning.com/library/module_viewer.php?mid=54 .

Ophardt C. (2003). Covalent Compounds. Retrieved December 6, 2005, from http://www.elmhurst.edu/~chm/vchembook/144Acovalent.html .

Rader A. (1997-2006). Chem 4 Kids. Retrieved January 6, 2006, from

http://www.chem4kids.com/

Thompson, M., McLaughlin, W., Zike, D., Ross-Flanigan, N., & Zorn, M. (2002). Physical Science. Columbus, OH: McGraw- Hill Companies, Inc.

Westbroek G. (2000). To React or Not to React? That is the Question. Retrieved January 9, 2006, from http://www.usoe.k12.ut.us/curr/science/sciber00/8th/matter/sciber/chemtype.htm .