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: Formal charge on oxygen
How to calculate the formal charge on oxygen Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic …
VideoFree10 minutes
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Chemistry: Plotting data for a second-order reaction
Example of graphing second order rate data to see a linear relationship, and calculating rate constant k from the slope. Chemistry Did you …
VideoFree8 minutes
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Chemistry: Electron affinity: period trend
Electron affinity is the change in energy when a neutral atom in its gaseous form gains an electron to form a negative ion. For example, wh…
VideoFree13 minutes
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Chemistry: Redox titration
A redox titration example: titrating an Fe(II) solution with potassium permanganate. Chemistry Did you know that everything is made out of …
VideoFree8 minutes
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Biology: Isomers
Structural isomers, stereoisomers, geometric isomers, cis-trans isomers, and enantiomers. Biology Life is beautiful! From atoms to cells, f…
VideoFree7 minutes
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Chemistry: Spectrophotometry introduction
Spectrophotometry, transmittance, absorbance and the Beer-Lambert Law Chemistry Did you know that everything is made out of chemicals? Chem…
VideoFree13 minutes
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Chemistry: Solubility and intermolecular forces
Solubility of salt and gas solutes in liquid solvent. Chemistry Did you know that everything is made out of chemicals? Chemistry is the stu…
VideoFree13 minutes
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Biology: Evolution: It's a Thing
Hank gets real with us in a discussion of evolution - it's a thing, not a debate. Gene distribution changes over time, across successive ge…
VideoFree11 minutes
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Biology: Natural Selection
Hank guides us through the process of natural selection, the key mechanism of evolution. Biology Life is beautiful! From atoms to cells, fr…
VideoFree12 minutes
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Chemistry: More on the dot structure for sulfur dioxide
How to analyze different ways to draw the dot structure for sulfur dioxide Chemistry Did you know that everything is made out of chemicals?…
VideoFree4 minutes
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Biology: Enzymes
Enzymes as catalysts for reactions in biological systems; discussion of substrates, active sites, induced fit, and activation energy. Biolo…
VideoFree8 minutes
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Organic chemistry: Birch reduction II
The effect of electron-withdrawing and electron-donating groups. Organic chemistry Sal and Jay cover topics covered in college organic chem…
VideoFree12 minutes
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Biology: Diffusion and osmosis
Learn about diffusion, osmosis, and concentration gradients and why these are important to cells. Biology Life is beautiful! From atoms to …
VideoFree19 minutes
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Organic chemistry: Proton NMR practice 1
Practice determining the structure of a molecule from the molecular formula, hydrogen deficiency index, and proton NMR spectrum. Uses examp…
VideoFree12 minutes
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Chemistry: First Law of Thermodynamics introduction
Energy cannot be created or destroyed. It can only be transferred or converted from one form to another. Chemistry Did you know that everyt…
VideoFree9 minutes