Sixty multiple choice questions cover the entire gamut of chemistry concepts. This is the local section of the U.S. National Chemistry Olympiad, where your chemistry candidates take a shot at entering the national competition. They...

For this entropy worksheet, learners define entropy and determine if reactions are exothermic or would occur spontaneously. This worksheet has 10 problems to solve.

In this chemical reaction instructional activity, learners use the free energy formula to determine if reactions are spontaneous or not. This instructional activity has 5 problems to solve.

In this chemistry learning exercise, students calculate specific changes that take place with different chemical reactions. Students indicate whether the reactions are endothermic or exothermic and spontaneous or nonspontaneous.

This site from Wikipedia enyclopedia provides this discussion over electrochemistry details what the oxidation state of an ion is; what oxidation and reduction is; what redox reactions are; and the difference between spontaneous and...