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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

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Overview of how carbon is recycled through our biosphere in the carbon cycle. Biology Life is beautiful! From atoms to cells, from genes to…

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Cosmology and astronomy: A universe smaller than the observable

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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…

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Biology: Eutrophication and dead zones

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How eutrophication, caused by extra nutrients in runoff, can lead to dead zones. Biology Life is beautiful! From atoms to cells, from genes…

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Organic chemistry: Conformational analysis of propane

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How to analyze the staggered and eclipsed conformations of propane Organic chemistry Sal and Jay cover topics covered in college organic ch…

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Chemistry: pH and pKa relationship for buffers

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How the Henderson-Hasselbalch equation can be used to look at the ratio of conjugate acid and base using relationship between buffer pH and…

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Biology: Helper T cells

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Introduction to helper T cells and their role in activating B cells. Biology Life is beautiful! From atoms to cells, from genes to proteins…

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Biology: Nitrogen and phosphorus cycles: Always recycle!

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Hank discusses how nitrogen and phosphorous are recycled through ecosystems and the biosphere. Biology Life is beautiful! From atoms to cel…

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Organic chemistry: Sn1 and Sn2: leaving group

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Using pKa table to determine leaving group ability for Sn1 and Sn2 reactions. Organic chemistry Sal and Jay cover topics covered in college…

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Organic chemistry: E1 mechanism: carbocations and rearrangements

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Comparing the stability of different kinds of carbocations using hyperconjugation. Mechanism of carbocation rearrangements including methyl…

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Chemistry: VSEPR for 3 electron clouds

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VSEPR for three electron clouds including examples for trigonal planar and bent molecules. Chemistry Did you know that everything is made o…

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High school biology: Introduction to passive and active transport

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Introduction to passive and active transport High school biology Passive and active transport Sometimes it pays to go with the flow! Learn …

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Chemistry: Dissolution and precipitation

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Defining solute, solvent, hydration, dissolution, precipitation, net ionic equation, and spectator ions. Looking at the molecular level int…

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Organic chemistry: Diels-Alder reaction

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How to draw the products for a Diels-Alder reaction Organic chemistry Sal and Jay cover topics covered in college organic chemistry course.…

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Chemistry: Electron configuration for f block element Nd

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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…

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Biology: Flow of energy and matter through ecosystems

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Seeing how energy and matter flows and is recycled from primary producers (autotrophs) to primary, secondary and tertiary consumers. Biolog…