The quizzes previously available on this web site, which were several years out-of-date, have now been replaced by ChemGym.net
ChemGym works on laptop and desktop computers as well as tablet computers and modern mobile phones.
When you get a question wrong, ChemGym explains what the correct answer should have been and why.
ChemGym does not use clearance codes, instead it moves you automatically on to the next quiz when you get 10 questions-in-a-row correct.
You can also adjust how ChemGym moves between quizzes to suit your preferences.
Try ChemGym today.
The old quizzes can now be found at legacy.chemgym.net