Chemistry
Khan Academy Team
Master stoichiometry & chemical reactions with this course from Khan Academy. Build a strong chemistry foundation!
More resources on Stoichiometry & Reactions
Chem LibreTexts - Acids and Bases
Open general chemistry textbook chapters covering acid-base definitions, ionization constants, pH calculations, polyprotic acids, buffers and hydrolysis, with worked examples and exercises. Suited to working through the theory at your own pace alongside a course.
Reactions
Illustrated Oxford University Press introduction by physical chemist Peter Atkins that explains a toolkit of basic reaction types such as precipitation, acid-base, redox and catalysis at the molecular level, then shows how they combine in processes like photosynthesis.
chemcollective.org/stoich
The Stoichiometry section of The ChemCollective is an interactive learning resource offering virtual labs, tutorials, and practice problems on stoichiometry and chemical reactions, including mole calculations, balancing equations, limiting reagents, and yields.