Chemical Formulas
Naming Chemical Formulas - This site provides a game where you have to match the compound name with the chemical formula.
Molecule Magic - more chemical formula and name matching, a little more challenging that the site above.
Balancing Chemical Equations

Review Chembalancer - This link will take you to a game that allows you to visualize the balancing of various chemical equations.
Sites for Balancing Equations 101 Worksheet -