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: Scale of cells
Thinking about how large a cell is compared to viruses, proteins and simple molecules. Biology Life is beautiful! From atoms to cells, from…
VideoFree7 minutes
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Organic chemistry: Relative stability of amides, esters, anhydrides, and acyl chlorides
Relative stability of amides, esters, anhydrides, and acyl chlorides. Organic chemistry Sal and Jay cover topics covered in college organic…
VideoFree11 minutes
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Biology: Introduction to energy
Energy is defined as the ability to do work. Energy can be found in many things and can take different forms. For example, kinetic energy i…
VideoFree11 minutes
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Organic chemistry: IR signals for carbonyl compounds
The IR signals of various carbonyl-containing compounds. How differences in wavenumber relate to differences in compound structure. Organic…
VideoFree13 minutes
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Biology: The nitrogen cycle
How nitrogen is recycled in our biosphere in the nitrogen cycle, including nitrogen fixation. Biology Life is beautiful! From atoms to cell…
VideoFree6 minutes
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High school biology: Example punnet square for sex-linked recessive trait
Example punnet square for sex-linked recessive trait High school biology Sex linkage Topic: Science Learn about all the sciences, from phys…
VideoFree5
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Chemistry: Titration curves and acid-base indicators
Choosing the best indicator for different titrations depending on the pH at the equivalence point. Chemistry Did you know that everything i…
VideoFree7 minutes
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Biology: Introduction to metabolism: Anabolism and catabolism
Overview of metabolism, anabolism, and catabolism. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations…
VideoFree10 minutes
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Organic chemistry: Dot structures II: Multiple bonds
How to draw double and triple bonds using dots to represent valence electrons. Organic chemistry Sal and Jay cover topics covered in colleg…
VideoFree6 minutes
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Biology: Hemoglobin
Hemoglobin and its role in the circulatory system. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations…
VideoFree15 minutes
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Biology: Biological molecules - You are what you eat
Hank talks about the molecules that make up every living thing - carbohydrates, lipids, and proteins - and how we find them in our environm…
VideoFree14 minutes
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Cosmology and astronomy: Radius of observable universe
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…
VideoFree17 minutes
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Cosmology and astronomy: Detectable civilizations in our galaxy 3
Reconciling with the traditional Drake Equation Cosmology and astronomy It's a great, big universe out there. In this section of Khan Acade…
VideoFree7 minutes
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Biology: Biogeochemical cycles overview
Introduction to how water, carbon, nitrogen, and phosphorus are cycled through ecosystems. Biology Life is beautiful! From atoms to cells, …
VideoFree8 minutes
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Organic chemistry: Ether naming and introduction
Ether naming and introduction. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding …
VideoFree11 minutes