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: 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
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Chemistry: Suspensions, colloids and solutions
A suspension is a heterogenous mixture containing large particles that will settle on standing. Sand in water is an example of a suspension…
VideoFree14 minutes
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Chemistry: 2015 AP Chemistry free response 1b and c
What happens to the cell potential when there is less oxygen in a zinc-air cell. From 2015 AP Chemistry free response 1b and 1c. Chemistry …
VideoFree7 minutes
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Organic chemistry: Nucleophilic acyl substitution
The general mechanism of nucleophilic acyl substitution (and leaving group stability). Organic chemistry Sal and Jay cover topics covered i…
VideoFree9 minutes
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Chemistry: sp² hybridization
sp² hybrid orbitals and properties of pi bonds. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of …
VideoFree13 minutes
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Biology: Population regulation
Learn the difference between density-dependent and density-independent factors that affect population growth, and explore examples of each.…
VideoFree11 minutes
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Chemistry: Paramagnetism and diamagnetism
Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactiv…
VideoFree8 minutes
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Biology: 2015 AP Biology free response 8
Humoral and cell-mediated immune responses. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to eco…
VideoFree5 minutes
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Cosmology and astronomy: Intergalactic scale
Intergalactic Scale Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the b…
VideoFree11 minutes
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Biology: Exponential and logistic growth in populations
Learn about population growth rates and how they can be modeled by exponential and logistic equations. Biology Life is beautiful! From atom…
VideoFree8 minutes