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Introduction to the states or phases of matter. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of …

Hank tells us the story of the complicated chemical dance that allows our skeletal muscles to contract and relax. Biology Life is beautiful…

Autoionization of water into hydronium and hydroxide ions. Chemistry Did you know that everything is made out of chemicals? Chemistry is th…

The pH of a salt solution is determined by the relative strength of its ​conjugated acid-base pair. Salts can be acidic, neutral, or basic.…

Becoming a Red Giant Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the …

Two different types of changes in the membrane potential of a neuron. Biology Life is beautiful! From atoms to cells, from genes to protein…

Alkene cleavage using ozone. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…

More formal understanding of why a negative change in Gibbs Free Energy implies a spontaneous, irreversible reaction. Chemistry Did you kno…

Difference between BC, BCE, AD and CE. A little bit about the birth of Jesus as well. Cosmology and astronomy It's a great, big universe ou…

Are all coral reefs the same? Each regional ecosystem has its own assemblage of species and each contributes uniquely to global biodiversit…

Examples showing how different types of bond configurations can be represented using resonance structures. Organic chemistry Sal and Jay co…

Understanding the structure of a muscle fiber. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to …

Could silicon play a role similar to carbon's in supporting life? Biology Life is beautiful! From atoms to cells, from genes to proteins, f…

Innate vs. adaptive immunity. Humoral adaptive immunity vs. cell-mediated adaptive immunity. Biology Life is beautiful! From atoms to cells…

Cambrian explosion and biodiversity in the Phanerozoic Eon Biology Life is beautiful! From atoms to cells, from genes to proteins, from pop…