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: 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
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Organic chemistry: Hydrogen deficiency index
How to relate molecular structure with the molecular formula using the hydrogen deficiency index (or number of degrees of unsaturation). Or…
VideoFree9 minutes
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Electrical engineering: Impedance vs frequency
The impedance of capacitors and inductors in a circuit depend on the frequency of the electric signal. The impedance of an inductor is dire…
VideoFree9 minutes
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Biology: Molecular structure of triglycerides (fats)
Understanding how a triglyceride (triacylglycerol) can be formed from a glycerol molecule and three fatty acids. Biology Life is beautiful!…
VideoFree11 minutes
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Health and medicine: What is sinusitis?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree9 minutes