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: Oxidation of alcohols II: Examples
Examples of oxidation reactions for primary, secondary, and tertiary alcohols. Organic chemistry Sal and Jay cover topics covered in colleg…
VideoFree7 minutes
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Chemistry: Period trend for ionization energy
Explaining trends in ionization energy across a period using nuclear charge, shielding, and distance of electrons from nucleus Chemistry Di…
VideoFree10 minutes
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Biology: Operons and gene regulation in bacteria
Looking at how regulatory DNA sequences can repress or promote gene transcription (particularly in bacteria operons). Biology Life is beaut…
VideoFree10 minutes
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Health and medicine: 5 common flu vaccine excuses
Many people choose to avoid the flu vaccine each year. Review five popular excuses, and how they relate to common misunderstandings about t…
VideoFree8 minutes
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Organic chemistry: Hydrogen deficiency index
How to relate molecular structure with the molecular formula using the hydrogen deficiency index (or number of degrees of unsaturation). Or…
VideoFree9 minutes
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Biology: Molecular structure of triglycerides (fats)
Understanding how a triglyceride (triacylglycerol) can be formed from a glycerol molecule and three fatty acids. Biology Life is beautiful!…
VideoFree11 minutes
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Health and medicine: What is sinusitis?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree9 minutes
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Organic chemistry: Carbocation rearrangement practice
Examples of using hydride and methyl shifts to form more stable carbocation. Organic chemistry Sal and Jay cover topics covered in college …
VideoFree9 minutes
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Health and medicine: Pulmonary abscess
Pulmonary abscesses occur when part of the lung tissue dies (caused by damage or infection) and gets trapped in a layer of hard tissue in t…
VideoFree11 minutes
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Health and medicine: Atherosclerosis - part 2
See how Atherosclerosis (Fat in the blood vessel wall) hardens the arterial wall and makes it harder for blood to flow through. Rishi is a …
VideoFree9 minutes
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Chemistry: Second-order reaction (with calculus)
Deriving the integrated rate law for second order reactions using calculus. How you can graph second order rate data to see a linear relati…
VideoFree7 minutes
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Health and medicine: Routes of drug entry
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree4 minutes
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Health and medicine: Three types of capillaries
Learn the differences between continuous, fenestrated, and discontinuous capillaries, and how they affect the movement of molecules. Rishi …
VideoFree9 minutes
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Chemistry: Empirical formula from mass composition
Calculating the empirical formula from the mass percent composition. Chemistry Did you know that everything is made out of chemicals? Chemi…
VideoFree7 minutes
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Chemistry: Sp hybridization
In sp hybridization, the 2s orbital and a 2p orbital hybridize to form two sp orbitals, each consisting of 50% s character and 50% p charac…
VideoFree11 minutes