This page is a basic exercise in redox equations. You are to use information available in the elctrochemical series to determine the number of electrons (n) that would be transferred in a redox reaction. When "New Problem" is selected, an unbalanced redox equation will be displayed. Determine what n would be for the balanced equation, enter it in the answer cell, and press "Check Answer". Results will appear. You only get one attempt per problem. If you miss a problem, the correct answer will be displayed and you will no longer be able to submit an answer to that question.
Note: if you see "(two)", this is a (cheesy) way to represent a stoichiometry of two (which is done due to programming limitations) - i.e. "2 F-" is represented in this drill as "(two) F-".