This 11-minute video lesson looks at the relative Stability of amides, esters, anhydrides, and acyl chlorides. [Organic Chemistry playlist: Lesson 71 of 73].

This 7-minute video lesson shows how to represent the structures of organic molecules. [Organic Chemistry playlist: Lesson 1 of 73].

This 16-minute video lesson looks at sp3 hybridized orbitals and sigma bonds. [Organic Chemistry playlist: Lesson 13 of 73].

This 14-minute video lesson looks at stereoisomers, enantiomers, diastereomers, constitutional Isomers, and Meso Compounds. [Organic Chemistry playlist: Lesson 24 of 73].

This 13-minute video lesson looks at Zaitsev's Rule for E2 and E1 reactions. [Organic Chemistry playlist: Lesson 40 of 73].

This 10-minute video lesson looks at Newton's First Law (Galileo's Law of Inertia).

This art history video presents a conversation between Salman Khan and Steven Zucker about sculpture and the language of representation. They examine Pablo Picasso's "Guitar" (1912-) 1914, made of ferrous sheet metal and wire. It's currently at the The Museum of Modern Art.

To plot an inequality, such as x>3, on a number line, first draw a circle over the number (e.g., 3). Then if the sign includes equal to (≥ or ≤), fill in the circle. If the sign does not include equal to (> or <), leave the circle unfilled in. Finally, draw a line going from the circle in the direction of the numbers that make the inequality true.

This 15-minute video lesson gives an example involving the preimage of a set under a transformation. It also gives a definition of kernel of a transformation.

The addition rule for probability is explained using Venn Diagrams. [Probability playlist: Lesson 3 of 29]

This lesson is a birthday problem that determines the probability that at least 2 people in a room of 30 share the same birthday. [Probability playlist: Lesson 17 of 29]

This lesson presents an example of dependent probability. [Probability playlist: Lesson 10 of 29]

This lesson presents an example of dependent probability. [Probability playlist: Lesson 11 of 29]

This lesson begins a six part series of basic probabiltiy using module examples. [Probability playlist: Lesson 4 of 29]

This lesson demonstrates probability using combinations and shows the probability of getting exatly 3 heads in 8 flips of a fair coin. [Probability playlist: Lesson 14 of 29]

This lesson is another demonstration of probability and combinations to determine the probability of making at least 3 out of 5 basketball free throws. [Probability playlist: Lesson 15 of 29]

This lesson uses playing cards and Venn Diagrams to explain the idea of probability [Probability playlist: Lesson 2 of 29]

Proof: Any subspace basis has same number of elements. Created by Sal Khan.