Dr. Yue-Ling Wong of the Wake Forest University Computer Science Department maintains the online Tutorial on Balancing Equations. Students interactively get to choose the types of atoms in a methane, ethane, propane, and ethanol equation; enter the atom counts for the equation and the product; and then attempt to balance the equation. The program tells you if you are right or wrong and gives the right answers whenever you request them. Twelve other more advance chemical equations are available as well, making the site more than just a Web programming example. In all, it's a good learning tool for introductory chemistry students.

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