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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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
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Chemistry: Acid-base properties of salts
Examples of different kinds of neutralization reactions, and analyzing the pH of the resulting salt solution. Chemistry Did you know that e…
VideoFree8 minutes
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Biology: Second Law of Thermodynamics and entropy
Second Law of Thermodynamics and entropy: the entropy of the universe constantly increases. Biology Life is beautiful! From atoms to cells,…
VideoFree9 minutes
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Health and medicine: Maternal changes in pregnancy
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree7 minutes
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Health and medicine: Delusional disorder
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree6 minutes
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Organic chemistry: Chiral vs achiral
Chirality is an important geometric property relating to a molecule's symmetry. A chiral molecule is non-superimposable with its mirror im…
VideoFree4 minutes
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Biology: 2015 AP Biology free response, 2a-b
Questions on cellular respiration. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, …
VideoFree12 minutes
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Health and medicine: Pre-capillary sphincters
Precapillary sphincters are segments of smooth muscle that help direct bloodflow into capillaries. Because there is a limited amount of blo…
VideoFree4 minutes
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Biology: DNA
Learn about DNA (deoxyribonucleic acid). Overview of DNA bases, complementary base pairing, and the structure of the double helix. Biology …
VideoFree13 minutes
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Chemistry: Stoichiometry
Stoichiometry expresses the quantitative relationship between reactants and products in a chemical equation. Stoichiometric coefficients in…
VideoFree10 minutes
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Health and medicine: What is laryngitis ?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree7 minutes
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Biology: Population ecology: The Texas mosquito mystery
Hank discusses population ecology, including the factors that limit population growth, using the example of a mosquito population. Biology …
VideoFree11 minutes
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Biology: Photosynthesis: Calvin cycle
The Calvin cycle, or the light-independent (dark) reactions of photosythesis. Biology Life is beautiful! From atoms to cells, from genes to…
VideoFree13 minutes
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Biology: Leading and lagging strands in DNA replication
Roles of DNA polymerase, primase, ligase, helicase and topoisomerase in DNA replication. An explanation of leading and lagging strands. Bio…
VideoFree10 minutes