The video lesson from Khan Academy provides instructional content for the AP Chemistry course. This video lesson models how to draw resonance structures and resonance hybrid using the example of nitrate anion.

This video lesson provides a definition of "reaction rate" and gives several examples of how to calculate the average rate of reaction. This information is intended for AP Chemistry students or for those taking college chemistry.

The video from Khan Academy provides practice questions for the SAT. Watch Sal work through a harder angles, arc lengths, and trig functions problem.

This video lesson for the MCAT explores the topic of naming and classifying carbohydrates. This video lesson was developed in collaboration with the Association of American Medical Colleges and Khan Academy.

This video lesson for the MCAT explores the type of carbohydrate called "epimers" and other common names. This video lesson was developed in collaboration with the Association of American Medical Colleges and Khan Academy.

This video lesson for the MCAT explores "disaccharide" and "polysaccharide" carbohydrates. This video lesson was developed in collaboration with the Association of American Medical Colleges and Khan Academy.

The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a basic angles, arc lengths, and trig functions problem.

This Khan Academy resource is a video about what a Supernova (Supernovae) is.

This video lesson from Khan Academy and the Association of American Medical Colleges provides study content for the MCAT. This resource discusses breathing-related sleep disorders.

This video lesson for the MCAT explores the cyclic structures and anomers, geometric variations found at certain atoms in carbohydrate molecules. This video lesson was developed in collaboration with the Association of American Medical...

See how transforming a data set by adding, subtracting, multiplying, or dividing a constant affects measures of center and spread.

Worked example finding area under density curves.

High level analysis of density curves. A focus on median, mean, left-skew and right-skew.

Analyzing skew, median, mean and height of a density curve.

An introduction to density curves for visualizing distributions. A brief review of frequency histograms and relative frequency histograms as well.

Sal uses the contingency table chi-square test to see if a couple of different herbs prevent people from getting sick.

Introduction to the chi-square test for homogeneity.

Chi-square test for association/independence.

Sal uses the chi square test to the hypothesis that the owner's distribution is correct.

Chi-square goodness-of-fit example.

Chi-square statistic for hypothesis testing (chi-square goodness-of-fit test).

Chi-Square distribution introduction.

A line graph is way to visually represent data, especially data that changes over time. Let's take a look at an example.

This video explains action potential patterns in neurons. [5:04]