ChemWiki is maintained by UC Davis and is a collaborative approach to chemistry education. Its Textbook Maps matches ChemWiki's openly available material to the contents of popular textbooks. Physical, theoretical, organic, inorganic, analytical, and general chemistry textbooks are included.
Highly reviewed by MERLOT peers - "Here's your chance to mix chemicals without wearing safety goggles. You won't spill any acid on the spectrometer in this lab. Choose solutions from the vast database and mix 'em together till the cloned cows come home. Marvel as the chemical solutions react in real time. "
The collection of interactive simulations covers a wide range of general chemistry topics, with each simulation addressing key concepts and enable students to practice and teachers to demonstrate these topics.
MIT Open Courseware offers an extensive series of online courses in Chemistry. Course format generally includes lecture videos, interactive concept quizzes (solution key), problem sets, terms and definitions, suggested topics and links, and exams (with solution key).
This site was established to provide chemistry students with a library of spectroscopy problems. Interpretation of spectra is a technique that requires practice - this site provides 1H NMR and 13C NMR, DEPT, COSY and IR spectra of various compounds for students to interpret.