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: The water cycle
How the sun's energy drives the water cycle on Earth. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populati…
VideoFree8 minutes
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Organic chemistry: Friedel-Crafts alkylation
The mechanism of alkylation. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…
VideoFree14 minutes
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Chemistry: VSEPR for 2 electron clouds
Definition of VSEPR and examples of molecules with two electron clouds. Chemistry Did you know that everything is made out of chemicals? Ch…
VideoFree8 minutes
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Chemistry: Nickel-cadmium battery
Balancing the redox reaction (in base) that occurs in a nickel-cadmium battery. Chemistry Did you know that everything is made out of chemi…
VideoFree11 minutes
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Health and medicine: Teeth
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree8 minutes
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Health and medicine: Alveolar gas equation - part 2
Find out how to calculate exactly how much oxygen is deep down inside your lungs! Rishi is a pediatric infectious disease physician and wor…
VideoFree7 minutes
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Chemistry: Titration introduction
Introduction to acid-base titrations using example of titrating 20.0 mL of HCl of unknown concentration with 0.100 M NaOH. Covers indicator…
VideoFree9 minutes
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Health and medicine: Ritual of the bedside exam
Dr. Abraham Verghese explains the ritual of the bedside exam Health and medicine The medical world can be a confusing place. Patients, thei…
VideoFree9 minutes
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Organic chemistry: Aromatic heterocycles II
The aromaticity of pyrrole, imidazole, and thiophene. Organic chemistry Sal and Jay cover topics covered in college organic chemistry cours…
VideoFree12 minutes
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Biology: The cytoskeleton
Exploring the cell cytoskeleton, including microfilaments and microtubules (with a brief mention of intermediate filaments). Biology Life i…
VideoFree7 minutes
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Biology: Molecular structure of fructose
Fructose in comparison with glucose. Pyranose and furanose rings. Sucrose made from glucose and fructose. Biology Life is beautiful! From a…
VideoFree10 minutes
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Health and medicine: What is chronic bronchitis?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree8 minutes
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Biology: Review of B cells, CD4+ T cells and CD8+ T cells
Review of B cells, CD4+ T cells and CD8+ T cells. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations …
VideoFree11 minutes
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Chemistry: Electron configuration for d block element
Introduces rules for elements in d-block. Goes through example of Fe, and discusses relative reactivity and energy of 4s and 3d electrons. …
VideoFree7 minutes
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Health and medicine: The structure of the eye
In this video, I review the structure of the eye. By Ronald Sahyouni. Health and medicine The medical world can be a confusing place. Patie…
VideoFree10 minutes