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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Health and medicine: Resetting cardiac concentration gradients
Watch as the heart cells use energy to reset the concentration gradients for all of the ions after the action potential has gone through. R…
VideoFree15 minutes
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Organic chemistry: Introduction to chirality
Introduction to chirality (handedness), and how chirality is related to the groups bonded to a central carbon. Organic chemistry Sal and Ja…
VideoFree7 minutes
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Health and medicine: When flu viruses attack!
Learn how flu viruses get into and out of your cells using Hemagglutinin and Neuraminidase proteins on their surface. Rishi is a pediatric …
VideoFree7 minutes
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Chemistry: Electron configurations for the third and fourth periods
How to write the electron configurations for elements in the third and fourth periods of the periodic table. includes using noble gas notat…
VideoFree13 minutes
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Chemistry: pH, pOH of strong acids and bases
Deriving the relationship between pKw, pH, and pOH. Calculating the pH or pOH of strong acids and bases. Chemistry Did you know that everyt…
VideoFree15 minutes
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Cosmology and astronomy: Detectable civilizations in our galaxy 2
Why do we even care about the Drake Equation. Thinking about the fraction of a planet's life when a civilization might be detectable. Cosmo…
VideoFree9 minutes
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Electrical engineering: LC natural response intuition 1
The inductor-capacitor (LC) circuit is the place where sinewaves are born. We talk about how this circuit works by tracking the movement of…
VideoFree5 minutes
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Organic chemistry: Representing structures of organic molecules
Representing structures of organic molecules using line (or line-angle) diagrams. Organic chemistry Sal and Jay cover topics covered in col…
VideoFree7 minutes
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Chemistry: States of matter follow-up
More on plasma and hydrogen bonds. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of matter: its c…
VideoFree9 minutes
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Health and medicine: Schizotypal personality disorder
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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Organic chemistry: Oxidation of alcohols II: Examples
Examples of oxidation reactions for primary, secondary, and tertiary alcohols. Organic chemistry Sal and Jay cover topics covered in colleg…
VideoFree7 minutes
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Chemistry: Period trend for ionization energy
Explaining trends in ionization energy across a period using nuclear charge, shielding, and distance of electrons from nucleus Chemistry Di…
VideoFree10 minutes
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Biology: Operons and gene regulation in bacteria
Looking at how regulatory DNA sequences can repress or promote gene transcription (particularly in bacteria operons). Biology Life is beaut…
VideoFree10 minutes
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Electrical engineering: RC step response setup (1 of 3)
The RC step response is an exponential curve. We set up the circuit and create the differential equation we need to solve. We introduce the…
VideoFree9 minutes
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Health and medicine: 5 common flu vaccine excuses
Many people choose to avoid the flu vaccine each year. Review five popular excuses, and how they relate to common misunderstandings about t…
VideoFree8 minutes