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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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Organic chemistry: Hydrohalogenation of alkynes

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Reaction of an alkyne with a hydrogen halide, leading to formation of a halogenated alkene or alkane. Organic chemistry Sal and Jay cover t…

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High school biology: Co-dominance and Incomplete Dominance

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Come learn about Co-dominance and incomplete dominance and how they differ from complete dominance. By Ross Firestone. High school biology …

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Chemistry: Introduction to electrolysis

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Comparing a voltaic cell to an electrolytic cell. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study o…

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Biology: DNA replication and RNA transcription and translation

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How DNA is copied (replication). How information in DNA can be used to make a protein. Biology Life is beautiful! From atoms to cells, from…

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Chemistry: Strong acids and strong bases

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Common strong acids and strong bases. Examples of calculating the pH of a nitric acid solution, sodium hydroxide solution, and a calcium hy…

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Biology: Natural selection and the owl butterfly

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How the "Owl Butterfly" may have gotten the spot on its wings. Biology Life is beautiful! From atoms to cells, from genes to proteins, from…

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Biology: ATP & respiration

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In which Hank does some push ups for science and describes the "economy" of cellular respiration and the various processes whereby our bodi…

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Biology: Reaction coupling to create glucose-6-phosphate

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Reaction coupling to create glucose-6-phosphate. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations t…

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Biology: Genetic variation, gene flow, and new species

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How genetic variation is the raw material of evolution, and how restricted gene flow can lead to the formation of new species. Video by Cal…

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Cosmology and astronomy: Solar and lunar eclipses

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Understanding solar eclipses and lunar eclipses. Why don't we have a solar eclipse every new moon (every time the Moon is between the Earth…

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Biology: Photosynthesis

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Hank explains the extremely complex series of reactions whereby plants feed themselves on sunlight, carbon dioxide and water, and also crea…

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Biology: Allele frequency

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Allele frequencies in populations and how they differ from genotype frequencies. Biology Life is beautiful! From atoms to cells, from genes…

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Biology: Animal communication

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

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Cosmology and astronomy: Cosmological time scale 2

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Cosmological Time Scale 2 Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about…

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Biology: Discovering the tree of life

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Discover the link between evolutionary trees and biodiversity. Video by California Academy of Sciences. Biology Life is beautiful! From ato…