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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Cosmology and astronomy: Radius of observable universe (correction)
(Correction) Radius of Observable Universe Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, y…
VideoFree2 minutes
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Organic chemistry: Electrophilic aromatic substitution
Electrophilic aromatic substitution. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understa…
VideoFree11 minutes
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Organic chemistry: Friedel crafts acylation addendum
Friedel-Crafts acylation addendum. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understand…
VideoFree1 minute
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Organic chemistry: Preparation of mesylates and tosylates
How to convert an alcohol into a mesylate or tosylate, making it a good leaving group. Organic chemistry Sal and Jay cover topics covered i…
VideoFree9 minutes
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Biology: Conservation and the race to save biodiversity
Different approaches to conservation and how they can protect species and habitats. Video by California Academy of Sciences. Biology Life i…
VideoFree12 minutes
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Biology: Lipid overview
Types of lipids including fats, waxes, steroids and phospholipids. Biology Life is beautiful! From atoms to cells, from genes to proteins, …
VideoFree12 minutes
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Biology: Plant cells
Hank describes why plants are so freaking amazing - discussing their evolution, and how their cells are both similar to & different from an…
VideoFree10 minutes
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Chemistry: Steric number and sp3 hybridization
Using steric number to calculate number of hybrid orbitals. Chemistry Did you know that everything is made out of chemicals? Chemistry is t…
VideoFree10 minutes
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Chemistry: Gibbs free energy example
Determining if a reaction is spontaneous by calculating the change in Gibbs free energy. Also calculates the change in entropy using table …
VideoFree10 minutes
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Biology: Sodium-potassium pump
How a sodium potassium pump can maintain a voltage gradient across a cell or neuron's membrane. Biology Life is beautiful! From atoms to ce…
VideoFree14 minutes
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Organic chemistry: More R,S practice
How to assign configurations to a molecule with two chirality centers Organic chemistry Sal and Jay cover topics covered in college organic…
VideoFree8 minutes
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Biology: 2015 AP Biology free response 3 - phylogenetic trees
Thinking about evolutionary distance between species. Constructing phylogenetic trees (cladograms). Biology Life is beautiful! From atoms t…
VideoFree9 minutes
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Cosmology and astronomy: Birth of stars
Birth of Stars Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the brain-…
VideoFree8 minutes
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Biology: Pollution
Hank discusses different forms of pollution and their ecological effects. Biology Life is beautiful! From atoms to cells, from genes to pro…
VideoFree9 minutes
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High school biology: Molecular evidence for evolutionary relationships examples
Two example items (from NY Regents exams) using molecular evidence to think about how closely related different species are. High school bi…
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