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: Hypotonic, isotonic, and hypertonic solutions (tonicity)
Hypotonic, isotonic and hypertonic solutions (tonicity). Seeing the effect of various types of solution on the direction of osmosis. Biolog…
VideoFree7 minutes
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Chemistry: Introduction to buffers
Introduction to buffer systems, which regulate pH in blood. Chemistry Did you know that everything is made out of chemicals? Chemistry is t…
VideoFree6 minutes
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Cosmology and astronomy: Energy inputs for tilling a hectare of land
Thinking about energy consumption for tilling land Cosmology and astronomy It's a great, big universe out there. In this section of Khan Ac…
VideoFree14 minutes
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High school biology: Skeletal structure and function
High school biology The musculoskeletal system Topic: Science Learn about all the sciences, from physics, chemistry and biology, to cosmolo…
VideoFree7 minutes
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Biology: Specific heat of water
Specific heat of water. A calorie as the specific heat of water. How water moderates temperature. Biology Life is beautiful! From atoms to …
VideoFree11 minutes
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Biology: Concentration gradients
A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles wil…
VideoFree3 minutes
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Organic chemistry: E2 E1 Sn2 Sn1 reactions example 3
E2 E1 Sn2 Sn1 reactions: Example 3 Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understand…
VideoFree13 minutes
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Biology: Worked example: Punnett squares
Learn how to use Punnett squares to calculate probabilities of different phenotypes. Includes worked examples of dihybrid crosses. independ…
VideoFree25 minutes
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Biology: Discussions of conditions for Hardy-Weinberg
An overview of what happens when the conditions for Hardy-Weinberg equilibrium are not fulfilled. Biology Life is beautiful! From atoms to …
VideoFree7 minutes
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Biology: 2015 AP Biology free response 4
Commonalities and differences between mitosis and meiosis. Biology Life is beautiful! From atoms to cells, from genes to proteins, from pop…
VideoFree5 minutes
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Biology: Protecting biodiversity: local and global policies
Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascina…
VideoFree11 minutes
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Chemistry: Titration of a weak acid with a strong base (continued)
Calculating the pH for titration of acetic acid with strong base NaOH at equivalence point and past the equivalence point. Chemistry Did yo…
VideoFree15 minutes
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Organic chemistry: Comparing E2, E1, Sn2, Sn1 reactions
Comparing E2 E1 Sn2 Sn1 reactions Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understandi…
VideoFree12 minutes
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High school biology: Viral replication: lytic vs lysogenic
High school biology The immune system Topic: Science Learn about all the sciences, from physics, chemistry and biology, to cosmology and as…
VideoFree5
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Organic chemistry: Preparation of epoxides: Stereochemistry
Stereochemistry of epoxide preparation and how it relates to mechanism. Organic chemistry Sal and Jay cover topics covered in college organ…
VideoFree15 minutes