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: The carbon cycle
Overview of how carbon is recycled through our biosphere in the carbon cycle. Biology Life is beautiful! From atoms to cells, from genes to…
VideoFree9 minutes
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Cosmology and astronomy: A universe smaller than the observable
A Universe Smaller than the Observable Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'l…
VideoFree9 minutes
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Biology: Eutrophication and dead zones
How eutrophication, caused by extra nutrients in runoff, can lead to dead zones. Biology Life is beautiful! From atoms to cells, from genes…
VideoFree7 minutes
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Organic chemistry: Conformational analysis of propane
How to analyze the staggered and eclipsed conformations of propane Organic chemistry Sal and Jay cover topics covered in college organic ch…
VideoFree8 minutes
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Chemistry: pH and pKa relationship for buffers
How the Henderson-Hasselbalch equation can be used to look at the ratio of conjugate acid and base using relationship between buffer pH and…
VideoFree8 minutes
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Biology: Helper T cells
Introduction to helper T cells and their role in activating B cells. Biology Life is beautiful! From atoms to cells, from genes to proteins…
VideoFree21 minutes
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Biology: Nitrogen and phosphorus cycles: Always recycle!
Hank discusses how nitrogen and phosphorous are recycled through ecosystems and the biosphere. Biology Life is beautiful! From atoms to cel…
VideoFree9 minutes
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Organic chemistry: Sn1 and Sn2: leaving group
Using pKa table to determine leaving group ability for Sn1 and Sn2 reactions. Organic chemistry Sal and Jay cover topics covered in college…
VideoFree7 minutes
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Organic chemistry: E1 mechanism: carbocations and rearrangements
Comparing the stability of different kinds of carbocations using hyperconjugation. Mechanism of carbocation rearrangements including methyl…
VideoFree10 minutes
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Chemistry: VSEPR for 3 electron clouds
VSEPR for three electron clouds including examples for trigonal planar and bent molecules. Chemistry Did you know that everything is made o…
VideoFree13 minutes
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High school biology: Introduction to passive and active transport
Introduction to passive and active transport High school biology Passive and active transport Sometimes it pays to go with the flow! Learn …
VideoFree8
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Chemistry: Dissolution and precipitation
Defining solute, solvent, hydration, dissolution, precipitation, net ionic equation, and spectator ions. Looking at the molecular level int…
VideoFree10 minutes
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Organic chemistry: Diels-Alder reaction
How to draw the products for a Diels-Alder reaction Organic chemistry Sal and Jay cover topics covered in college organic chemistry course.…
VideoFree8 minutes
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Chemistry: Electron configuration for f block element Nd
Explains where f block fits in in the periodic table, and the n-2 rule. Introduces shorthand notation to get e configuration of Nd based on…
VideoFree6 minutes
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Biology: Flow of energy and matter through ecosystems
Seeing how energy and matter flows and is recycled from primary producers (autotrophs) to primary, secondary and tertiary consumers. Biolog…
VideoFree10 minutes