The World Lecture Hall offers free online course materials for university-level courses from around the world.

College Homework Help provides links to tutoring and homework help for college students, as well as links to related items such as dictionaries, encyclopedias, and subject-specific help.

ChemTutor begins with the fundamentals and gives expert help with the most difficult phases of understanding your first course in chemistry, at  high school or college level.  Has Spanish version.

Part of the "What You Need to Know About..." series, Chemistry 101 is a compilation of all of the general and introductory chemistry articles, tutorials, and tools created by your About Chemistry Guide.

 

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