ChemReview.net   
An excellent source for solved problems and worksheets for practice in General Chemistry.

Much more intense and advanced than ChemTutor, but extremely helpful for the student who is considering a four-year nursing degree or a career in science, engineering or math who will need to  take Chem 4, Chem 21 or General Chemistry.

This site is for high school and college introductory Chemistry. It can be your personal tutor for help with problem-solving essential for for math, units and measures, and for definitions and examples to help clarify atomic structure, elements, periodic table, states of matter, as well as compounds, reactions, mols, oxidation and reduction reaction,  gases, solutions, acids and bases . The site is NOT a text. It is meant to be used along with our text book as a source of very useful tutorials.