The chemistry archive contains legacy chemistry content, and is not being updated with new content. For our most up-to-date, mastery-enabled courses, check out Middle School Chemistry, High School …

A big picture view of chemistry and why it is fascinating. How chemistry relates to math and other sciences.

Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic high school or college chemistry assumed (although there is some review).

Learn high school chemistry using videos, articles, and NGSS-aligned practice. Explore the fundamentals of atomic structure, chemical bonding, chemical reactions, thermochemistry, solutions, …

Learn AP Chemistry using videos, articles, and AP-aligned practice. Review the fundamentals of atomic structure, intermolecular forces and bonding, chemical reactions, kinetics, thermodynamics, and …

Chemistry explores matter and its transformations. From ancient alchemists seeking to turn lead into gold, to modern scientists studying atoms, chemistry reveals how everything is made and how it …

Acids and bases can be described using the Arrhenius model: acids produce H+ ions in aqueous solutions, while bases produce OH- ions. We can identify acidic and basic solutions using their …

Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a …

This unit examines the role of chemical equilibrium in acid–base chemistry. Learn about pH and pOH, weak acids and bases, buffers, acid–base titrations, and more. Practice what you’ve learned and …

During radioactive decay, an unstable nucleus (the "parent") spontaneously changes to become a different nucleus (the "daughter"), emitting radiation in the process. The nuclear radiation emitted …