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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: Biological molecules - You are what you eat

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Hank talks about the molecules that make up every living thing - carbohydrates, lipids, and proteins - and how we find them in our environm…

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Cosmology and astronomy: Radius of observable universe

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Radius of Observable Universe Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn a…

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Cosmology and astronomy: Detectable civilizations in our galaxy 3

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Reconciling with the traditional Drake Equation Cosmology and astronomy It's a great, big universe out there. In this section of Khan Acade…

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Biology: Biogeochemical cycles overview

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Introduction to how water, carbon, nitrogen, and phosphorus are cycled through ecosystems. Biology Life is beautiful! From atoms to cells, …

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Organic chemistry: Ether naming and introduction

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Ether naming and introduction. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding …

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Chemistry: Introduction to kinetics

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Kinetics is the study of reaction rates and how they are affected. Many factors, such as concentration, pressure, temperature, and enzyme a…

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Chemistry: Relationship between Ka and Kb

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The relationship between Ka and Kb, and pKa and pKb. Examples of finding Ka of a weak acid given Kb of the conjugate base. Chemistry Did yo…

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Biology: Comparative anatomy: What makes us animals

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Hank introduces us to comparative anatomy, which studies the similarities and differences in animal anatomy to support the theory of evolut…

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Biology: The skeletal system: It's ALIVE!

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Hank introduces us to the framework of our bodies, our skeleton, which apart from being the support and protection for all our fleshy parts…

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Organic chemistry: Preparation of esters via Fischer esterification

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How to draw the mechanism for a Fischer esterification. Organic chemistry Sal and Jay cover topics covered in college organic chemistry cou…

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Biology: Sodium potassium pump

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How the the sodium-potassium (Na+/K+) pump works. Its role in establishing resting membrane potentials. Biology Life is beautiful! From ato…

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Chemistry: Buffer capacity

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The definition of buffer capacity, and an example showing why it depends on the absolute concentrations of the conjugate acid and base. Che…

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Organic chemistry: Free radical reactions

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Free radical reactions Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic…

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High school biology: Fossils: Rocking the Earth

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Use fossils, like clues buried inside of rocks, to unlock the history of life on our planet. Play the Evolution Lab: http://www.pbs.org/nov…

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Organic chemistry: Fischer esterification

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Fischer esterification of carboxylic acids. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic u…