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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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
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Chemistry: Galvanic cells and changes in free energy
Relationship between Gibbs free energy, reaction quotient Q, and cell voltage. Chemistry Did you know that everything is made out of chemic…
VideoFree13 minutes
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Cosmology and astronomy: Collective learning
How symbolic language drives collective learning and how this is one of the truly differentiating aspects of human beings relative to the r…
VideoFree13 minutes
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Organic chemistry: Elimination vs substitution: reagent
How to figure out if a reagent will act as a strong or weak base or a nucleophile in a reaction. Organic chemistry Sal and Jay cover topics…
VideoFree8 minutes
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Organic chemistry: Electronegativity and chemical shift
How electronegativity influences chemical shift in proton NMR. Organic chemistry Sal and Jay cover topics covered in college organic chemis…
VideoFree11 minutes