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: Electron configurations for the first period
Introduces aufbau principle, Pauli exclusion principle, and orbital notation. Writes out the quantum numbers for the electrons in H and He.…
VideoFree6 minutes
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Chemistry: Chilling water problem
How much ice at -10 degrees C is necessary to get 500 g of water down to 0 degrees C? Chemistry Did you know that everything is made out of…
VideoFree11 minutes
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Biology: Circulatory & respiratory systems
Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxid…
VideoFree11 minutes
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Cosmology and astronomy: Plate tectonics: Difference between crust and lithosphere
Plate Tectonics Introduction and Difference between crust and lithosphere Cosmology and astronomy It's a great, big universe out there. In …
VideoFree8 minutes
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Organic chemistry: Chemical equivalence
How to predict the number of signals in a proton NMR spectrum based on the number of non-equivalent hydrogens in a compound. Organic chemis…
VideoFree11 minutes
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Organic chemistry: Sn1 vs Sn2: Summary
Summary of Sn1 and Sn2 reactions and the types of molecules and solvents that favor each. Organic chemistry Sal and Jay cover topics covere…
VideoFree14 minutes
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High school biology: Introduction to vitamins and minerals
Overview of common vitamins and minerals that are important to human health High school biology Biological macromolecules There's an old sa…
VideoFree6
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High school biology: Data to justify experimental claims examples
Example questions analyzing data to justify claims in experiments. High school biology Biology and the scientific method How do biologists …
VideoFree5
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Biology: Mitosis
Mitosis is how cells divide! Learn what happens in all the phases of mitosis: prophase, metaphase, anaphase, and telophase. Biology Life is…
VideoFree12 minutes
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Organic chemistry: Spin-spin splitting (coupling)
How peaks in a proton NMR can get split into multiplets due to coupling with neighboring protons. Organic chemistry Sal and Jay cover topic…
VideoFree12 minutes
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High school biology: Homeostasis
Ever wondered why your temperature stays at 98.6 degrees? Learn about homeostasis and how your body maintains a stable temperature. High sc…
VideoFree4
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Biology: Photorespiration
The Calvin cycle and a competing pathway called photorespiration (also initiated by Rubisco). Biology Life is beautiful! From atoms to cell…
VideoFree11 minutes
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Organic chemistry: Preparation of alcohols using LiAlH4
How to prepare a primary or secondary alcohol from an aldehyde, ketone, carboxylic acid, or ester using lithium aluminum hydride. Organic c…
VideoFree11 minutes
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Biology: The excretory system: From your heart to the toilet
Hank takes us on the fascinating journey through our excretory system to learn how our kidneys make pee. Biology Life is beautiful! From at…
VideoFree12 minutes
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Chemistry: Lead storage battery
Balancing the redox reaction (in acid) that occurs in a lead storage battery. Chemistry Did you know that everything is made out of chemica…
VideoFree9 minutes