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LibreTexts Chemistry is a free, openâaccess library of General Chemistry textbooks and learning resources, offering modular chapters, tutorials, and practice problems. It covers core topics from matter and measurements through thermodynamics and kinetics, with multimedia content and interactive exercises.
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ocw.mit.edu/general
MIT OpenCourseWare General Chemistry offers free, openly licensed course materials for MIT's General Chemistry course, including lecture notes, problem sets, exams, and lab materials.