This page provides exercises in balancing chemical reactions. When you press "New Reaction", a chemical equation with an empty cell before each compound will be displayed below. Enter the appropriate coeffcients in each cell and press "Check Answer." Results will appear immediately in the scoring table. This page will only accept the smallest set of integer coefficients, and blank entries will be considered to be zero, so put a "1" in where stoichiometrically appropriate. Pressing "Show Answer" will cause the correct answer to appear and you will no longer be able submit an answer for that problem.