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Van der Waals forces: London dispersion forces, dipole-dipole forces, and hydrogen bonding. Chemistry Did you know that everything is made …

Seeing how energy and matter flows and is recycled from primary producers (autotrophs) to primary, secondary and tertiary consumers. Biolog…

Find out exactly where the heart rests in your body and what it does. Rishi is a pediatric infectious disease physician and works at Khan A…

Introduction to PCR (polymerase chain reaction). Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations t…

Working through a calculation for K-Ar dating (good to have some prior experience with e and logarithms) Biology Life is beautiful! From at…

How the geometry of a molecule plays into aromaticity. Why cyclooctatetraene is not aromatic like benzene. Organic chemistry Sal and Jay co…

Using the Hardy-Weinberg equation to calculate allele and genotype frequencies. Biology Life is beautiful! From atoms to cells, from genes …

Overview of how chromosomes were first proposed as the carriers of Mendel's "heritable factors" (what we now call "genes"). Biology Life is…

Structure of the Earth - crust, mantle, core Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy,…

The halogenation of benzene. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…

Geological features of Convergent Plate Boundaries Cosmology and astronomy It's a great, big universe out there. In this section of Khan Ac…

Hydrocarbon overview. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is th…

Seeing how a noncompetitive inhibitor can bind whether or not the substrate is bound, and vice versa. Biology Life is beautiful! From atoms…

Amino acids and the central dogma of molecular biology. Amino and carboxyl groups, side chains, and zwitterions. Biology Life is beautiful!…

Demonstrating that voltage is an intensive property by calculating the voltage and change in Gibbs free energy for a half reaction. Chemist…