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
Reaction of an alkyne with a hydrogen halide, leading to formation of a halogenated alkene or alkane. Organic chemistry Sal and Jay cover t…
VideoFree10 minutes
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High school biology: Co-dominance and Incomplete Dominance
Come learn about Co-dominance and incomplete dominance and how they differ from complete dominance. By Ross Firestone. High school biology …
VideoFree3
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Chemistry: Introduction to electrolysis
Comparing a voltaic cell to an electrolytic cell. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study o…
VideoFree7 minutes
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Biology: DNA replication and RNA transcription and translation
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…
VideoFree15 minutes
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Chemistry: Strong acids and strong bases
Common strong acids and strong bases. Examples of calculating the pH of a nitric acid solution, sodium hydroxide solution, and a calcium hy…
VideoFree13 minutes
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Biology: Natural selection and the owl butterfly
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…
VideoFree13 minutes
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Biology: ATP & respiration
In which Hank does some push ups for science and describes the "economy" of cellular respiration and the various processes whereby our bodi…
VideoFree13 minutes
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Biology: Reaction coupling to create glucose-6-phosphate
Reaction coupling to create glucose-6-phosphate. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations t…
VideoFree7 minutes
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Biology: Genetic variation, gene flow, and new species
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…
VideoFree12 minutes
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Cosmology and astronomy: Solar and lunar eclipses
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…
VideoFree6
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Biology: Photosynthesis
Hank explains the extremely complex series of reactions whereby plants feed themselves on sunlight, carbon dioxide and water, and also crea…
VideoFree13 minutes
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Biology: Allele frequency
Allele frequencies in populations and how they differ from genotype frequencies. Biology Life is beautiful! From atoms to cells, from genes…
VideoFree7 minutes
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Biology: Animal communication
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree4 minutes
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Cosmology and astronomy: Cosmological time scale 2
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…
VideoFree6 minutes
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Biology: Discovering the tree of life
Discover the link between evolutionary trees and biodiversity. Video by California Academy of Sciences. Biology Life is beautiful! From ato…
VideoFree8 minutes