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Learn about the many types of interspecific interactions: competition, predation, herbivory, symbiosis, parasitism, mutualism, commensalism…

Hank discusses the history of life on Earth (including major events such as oxygenation of the atmosphere and mass extinctions). Biology Li…

Example of graphing first-order rate data to see a linear relationship, and calculating rate constant k from the slope. Chemistry Did you k…

Black Holes Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the brain-ben…

Bronsted-Lowry definition of acids and bases. Conjugate acids and bases. Chemistry Did you know that everything is made out of chemicals? C…

Defines electronegativity and compares to electron affinity. Explains group and period trends in electronegativity using atomic radii. Chem…

Organic chemistry naming examples 4 Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understan…

How to name bicyclic compounds. Numbering the chain and Identifying bridgehead carbons. Organic chemistry Sal and Jay cover topics covered …

Using an amino acid translation table to understand the impact of point and frameshift mutations. High school biology DNA replication and p…

How does the gene pool contribute to biodiversity? Learn how genetic diversity within populations contributes to species survival. Video by…

Introduction to cilia, flagella and pseudopodia High school biology Basic cell structures We'll learn about the complex and beautiful struc…

Example of using table of standard reduction potentials to calculate standard cell potential. Chemistry Did you know that everything is mad…

Definition of formal charge, and how minimization of formal charge can help choose the more stable dot structure. Chemistry Did you know th…

Oxygen uptake by hemoglobin in red blood cells. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to…

Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascina…