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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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
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Organic chemistry: More functional groups
An overview of the carbonyl-containing functional groups Organic chemistry Sal and Jay cover topics covered in college organic chemistry co…
VideoFree9 minutes
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Organic chemistry: Formation of nitrate esters
Formation of a nitrate ester from reaction of an alcohol with nitric acid. Organic chemistry Sal and Jay cover topics covered in college or…
VideoFree6 minutes
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Organic chemistry: Sn1 mechanism: carbocation rearrangement
Examples of Sn1 reactions involving carbocation rearrangements. Organic chemistry Sal and Jay cover topics covered in college organic chemi…
VideoFree8 minutes
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Organic chemistry: Hydration of alkynes
Reaction between a terminal alkyne, a strong acid, and mercury (II) sulfate. Using Mark's rule to determine the regiochemistry of addition,…
VideoFree8 minutes
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Chemistry: Noble gas configuration
How to write electron configurations for atoms and monatomic ions using noble gas configuration Chemistry Did you know that everything is m…
VideoFree7 minutes
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Biology: Transcription and mRNA processing
Introduction to transcription including the role of RNA polymerase, promoters, terminators, introns and exons. Biology Life is beautiful! F…
VideoFree10 minutes
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Chemistry: Precipitation reactions
A lot of ionic compounds dissolve in water, dissociating into individual ions. But when two ions find each other that form an insoluble com…
VideoFree11 minutes
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Chemistry: Titration of a weak base with a strong acid
In a weak base-strong acid titration, the acid and base will react to form an acidic solution. A conjugate acid will be produced during the…
VideoFree15 minutes
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Biology: The reproductive system: How gonads go
Hank lets us in on the meaning of life, at least from a biological perspective - it's reproduction, which answers the essential question of…
VideoFree12 minutes
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Biology: Circulatory system and the heart
Introduction to the circulatory system and the heart. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populati…
VideoFree15 minutes
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Organic chemistry: Sn2 mechanism: kinetics and substrate
The mechanism, rate law, and stereochemistry of Sn2 reactions. How the sterics of the alkyl halide affect the reaction rate. Organic chemis…
VideoFree7 minutes