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: Great glands - Your endocrine system
Hank fills us in on the endocrine system - the system of glands which produce and secrete different types of hormones directly into the blo…
VideoFree11 minutes
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Organic chemistry: Meso compounds
How to identify meso compounds Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding …
VideoFree10 minutes
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Biology: Earth formation
Earth was formed approximately 4.6 billion years ago, likely as the result of a supernova (star explosion). The debris from this explosion…
VideoFree10 minutes
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Organic chemistry: Diels-Alder: stereochemistry of diene
How to analyze the stereochemistry of the diene in a Diels-Alder reaction Organic chemistry Sal and Jay cover topics covered in college org…
VideoFree11 minutes
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High school biology: Introduction to pH
Introduction to pH. Chart from Anatomy & Physiology, Connexions Web site. http://cnx.org/content/col11496/1.6/, Jun 19, 2013. user CC-BY Hi…
VideoFree5
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Biology: Saturated fats, unsaturated fats, and trans fats
Saturated fats, unsaturated fats, and trans fats. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations …
VideoFree9 minutes
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Biology: Genetic drift, bottleneck effect, and founder effect
Learn how chance events can alter allele frequencies in populations, particularly when the populations are small, via genetic drift, the bo…
VideoFree11 minutes
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Biology: How tropomyosin and troponin regulate muscle contraction
How calcium ion concentration dictates whether a muscle contracts or not. Biology Life is beautiful! From atoms to cells, from genes to pro…
VideoFree9 minutes
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Biology: Endoplasmic reticulum and Golgi bodies
Structure of the endoplasmic reticulum and Golgi body (Golgi apparatus). Their role in protein secretion. Biology Life is beautiful! From a…
VideoFree12 minutes
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Biology: DNA as the "transforming principle"
How Griffith and later Avery, McCarty and MacLeod found strong evidence that DNA is the "transforming principle" that encodes genetic infor…
VideoFree10 minutes
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Chemistry: Reactions in equilibrium
Equilibrium reactions and constants. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of matter: its…
VideoFree15 minutes
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Chemistry: Definition of pH
Introduction to pH and the pH scale. Examples of calculating pH of pure water, bleach, and orange juice. Chemistry Did you know that everyt…
VideoFree12 minutes
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Chemistry: 2015 AP Chemistry free response 7
Energy necessary to recycle aluminum from aluminum oxide. From 2015 AP Chemistry free response 7. Chemistry Did you know that everything is…
VideoFree6 minutes
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Biology: Light dependent reactions actors
More detailed description of the various molecular actors in the light dependent reactions. Biology Life is beautiful! From atoms to cells,…
VideoFree7 minutes
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Chemistry: Autoionization of water
Autoionization of water into hydronium and hydroxide ions. Chemistry Did you know that everything is made out of chemicals? Chemistry is th…
VideoFree11 minutes