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: Introduction to redox reactions
Finding the half reactions in a combustion reaction, and identifying what is getting oxidized and reduced. Chemistry Did you know that ever…
VideoFree11 minutes
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Organic chemistry: Identifying functional groups
How to identify functional groups present in organic compounds Organic chemistry Sal and Jay cover topics covered in college organic chemis…
VideoFree9 minutes
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Biology: Example of a signal transduction pathway
Illustrating the complexity of signal transduction with a MAPK pathway. How mutations in the pathway are linked to cancer. Biology Life is …
VideoFree7 minutes
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Chemistry: Ionization energy trends
Definition of ion and ionization energy, and trends in ionization energy across a period and down a group. Chemistry Did you know that ever…
VideoFree10 minutes
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Biology: LeBron Asks: Why does sweating cool you down?
LeBron asks Sal why sweating helps cool the body down. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populat…
VideoFree6 minutes
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Chemistry: First-order reaction example
Example of using the integrated rate law to solve for time and concentration, and calculating the half life for a first-order reaction. Che…
VideoFree10 minutes
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High school biology: Welcome to the reproductive system
High school biology The reproductive system Topic: Science Learn about all the sciences, from physics, chemistry and biology, to cosmology …
VideoFree7 minutes
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Electrical engineering: What is inside a DVD player? (3 of 5)
In this video we explore the control board inside a DVD player. Electrical engineering Learn about electricity, circuit theory, and introdu…
VideoFree3 minutes
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Organic chemistry: Chemical shift
The formula for calculating chemical shift based on a TMS reference signal and spectrophotometer frequency. Organic chemistry Sal and Jay c…
VideoFree6 minutes
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Electrical engineering: Compare the hair dryer motor to the one you can build
In this video we compare our hair dryer motor to the motor we built. Electrical engineering Learn about electricity, circuit theory, and in…
VideoFree2 minutes
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Chemistry: Balancing redox reactions in base
How to balance a redox reaction in base. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of matter:…
VideoFree14 minutes
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Biology: The nervous system
Hank begins a series of videos on organ systems with a look at the nervous system and all of the things that it is responsible for in the b…
VideoFree12 minutes
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Electrical engineering: Visualizing the Fourier expansion of a square wave
Visualize the Fourier expansion of a square wave. A square wave can be approximated by adding odd harmonics of a sine wave. Electrical engi…
VideoFree4 minutes
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Biology: Community ecology: Feel the love
Hank explores community ecology, the competitive exclusion principle, and how different species can coexist by occupying different niches. …
VideoFree11 minutes
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Electrical engineering: Digital recorder/player connections
In this video we attach and wire a digital voice recorder to Bit-zee. Electrical engineering Learn about electricity, circuit theory, and i…
VideoFree7 minutes