Khan Academy: 2757 products
Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.
All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …
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Organic chemistry: Preparation of esters via Fischer esterification
How to draw the mechanism for a Fischer esterification. Organic chemistry Sal and Jay cover topics covered in college organic chemistry cou…
VideoFree10 minutes
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Biology: Sodium potassium pump
How the the sodium-potassium (Na+/K+) pump works. Its role in establishing resting membrane potentials. Biology Life is beautiful! From ato…
VideoFree7 minutes
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Chemistry: Buffer capacity
The definition of buffer capacity, and an example showing why it depends on the absolute concentrations of the conjugate acid and base. Che…
VideoFree11 minutes
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Organic chemistry: Free radical reactions
Free radical reactions Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic…
VideoFree14 minutes
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High school biology: Fossils: Rocking the Earth
Use fossils, like clues buried inside of rocks, to unlock the history of life on our planet. Play the Evolution Lab: http://www.pbs.org/nov…
VideoFree2
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Organic chemistry: Fischer esterification
Fischer esterification of carboxylic acids. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic u…
VideoFree17 minutes
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Chemistry: Balancing more complex chemical equations
Example of balancing the combustion reaction of ethylene, C₂H₄. Some tips on how to balance more complicated reactions. Chemistry Did you k…
VideoFree5 minutes
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Organic chemistry: Disubstituted cyclohexane
How to draw chair conformations for disubstituted cyclohexane Organic chemistry Sal and Jay cover topics covered in college organic chemist…
VideoFree11 minutes
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Biology: Molecular structure of DNA
Molecular structure of DNA. Nucleotide. Nitrogenous base, phosphate. Biology Life is beautiful! From atoms to cells, from genes to proteins…
VideoFree13 minutes
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Biology: Ecological succession
Communities are dynamic and change over time, and we can observe this process with particular clarity after a disturbance or on new land. L…
VideoFree5 minutes
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High school biology: Meet the lungs
Every time you take a breath, oxygen makes it way into your lungs. Follow along on that journey! Rishi is a pediatric infectious disease ph…
VideoFree10 minutes
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Chemistry: Catalysts
How a catalyst speeds up a reaction by lowering the activation energy. Chemistry Did you know that everything is made out of chemicals? Che…
VideoFree8 minutes
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Chemistry: 2015 AP Chemistry free response 3f
Analyzing concentrations when pH lower than half-equivalence point. From 2015 AP Chemistry free response 3f. Chemistry Did you know that ev…
VideoFree5 minutes
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Biology: Hardy-Weinberg equation
This equation relates allele frequencies to genotype frequencies for populations in Hardy-Weinberg equilibrium. Biology Life is beautiful! …
VideoFree8 minutes
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Organic chemistry: Acid chloride formation
Acetic acid to acetyl chloride mechanism. Can be generalized to forming any acid halide from a carboxylic acid. Organic chemistry Sal and J…
VideoFree12 minutes