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: Overview of protein structure
Primary, secondary, tertiary and quaternary protein structure. Beta pleated sheets and alpha helices. Biology Life is beautiful! From atoms…
VideoFree10 minutes
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Chemistry: Hess's law example
Hess's law example Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, prop…
VideoFree12 minutes
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Organic chemistry: Optical activity
How optically active compounds rotate plane polarized light Organic chemistry Sal and Jay cover topics covered in college organic chemistry…
VideoFree9 minutes
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Chemistry: Spectrophotometry example
Spectrophotometry Example - determining concentration based on absorbance Chemistry Did you know that everything is made out of chemicals? …
VideoFree13 minutes
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Chemistry: Disproportionation
Assigning oxidation states for the decomposition of hydrogen peroxide, a disproportionation reaction. Chemistry Did you know that everythin…
VideoFree5 minutes
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Organic chemistry: Organic acid-base mechanisms
How to use curved arrows to draw mechanisms for organic acid-base reactions Organic chemistry Sal and Jay cover topics covered in college o…
VideoFree6 minutes
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Biology: Saltatory conduction in neurons
Myelin sheaths, nodes of Ranvier, and saltatory conduction in neurons. Biology Life is beautiful! From atoms to cells, from genes to protei…
VideoFree11 minutes
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Biology: Zygote differentiating into somatic and germ cells
Learn how a zygote, the single cell produced by fertilization, divides by mitosis to produce all the tissues of the human body (including g…
VideoFree10 minutes
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Chemistry: Mechanisms and the rate-determining step
An introduction to mechanisms and the rate determining step. Example of finding rate law of multistep reaction with initial slow step. Chem…
VideoFree9 minutes
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Chemistry: 2015 AP Chemistry free response 2a (part 1 of 2)
Moles of ethene produced from dehydration reaction with ethanol. From 2015 AP Chemistry free response 2a, part 1 of 2. Chemistry Did you kn…
VideoFree11 minutes
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Biology: The hydrologic and carbon cycles: Always recycle!
Hank explains how carbon and water are recycled through ecosystems and the biosphere. Biology Life is beautiful! From atoms to cells, from …
VideoFree9 minutes
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Biology: Hydrogen bonding in water
Hydrogen bonding in water. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology …
VideoFree7 minutes
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Biology: Cancer
An introduction to what cancer is and how it is the by-product of broken DNA replication. Biology Life is beautiful! From atoms to cells, f…
VideoFree13 minutes
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Organic chemistry: Monosubstituted cyclohexane
How to draw and analyze the two chair conformations for a monosubstituted cyclohexane Organic chemistry Sal and Jay cover topics covered in…
VideoFree8 minutes
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Biology: Demystifying ocean acidification and biodiversity impacts
Why rising carbon dioxide levels in the atmosphere affect the acidity of the ocean, and what the consequences are for marine life. Video by…
VideoFree12 minutes