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: 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…
VideoFree6
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Organic chemistry: Hydroboration-oxidation
A two-step reaction that converts an alkane double bond to a single bond, with regioselective and stereoselective addition of a hydroxyl gr…
VideoFree10 minutes
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Biology: Phototropism
Phototropism and the role that auxin plays. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to eco…
VideoFree7 minutes
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Chemistry: 2015 AP Chemistry free response 4
Calculating the molar solubility of calcium hydroxide in a 0.10 M calcium nitrate solution. From 2015 AP Chemistry free response 4. Chemist…
VideoFree9 minutes
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Biology: Molecular structure of glucose
Molecular structure of glucose. Monosaccharide structure. Linear and ring forms. Biology Life is beautiful! From atoms to cells, from genes…
VideoFree9 minutes
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Organic chemistry: Stabilization of a conjugate base: induction
How a conjugate base is stabilized by the inductive effect Organic chemistry Sal and Jay cover topics covered in college organic chemistry …
VideoFree5 minutes
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Biology: Simple animals: Sponges, jellies, & octopuses
Hank introduces us to the "simplest" of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as "animals"…
VideoFree11 minutes
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Biology: Animal behavior: foraging
Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascina…
VideoFree2 minutes
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Biology: Passive transport and selective permeability
Passive transport and selective permeability. Passive transport through diffusion. Biology Life is beautiful! From atoms to cells, from gen…
VideoFree7 minutes
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Chemistry: Chemical reactions introduction
Reactants and products in reversible and irreversible chemical reactions. Chemistry Did you know that everything is made out of chemicals? …
VideoFree9 minutes