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: Second-order reaction example
Example of using integrated rate law to solve for concentration, and calculating the half life for a second-order reaction. Chemistry Did y…
VideoFree8 minutes
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Biology: Biodiversity and natural selection
Patterns and processes of evolution. How evolution and natural selection are reflected in the similarities and differences of organisms. Vi…
VideoFree9 minutes
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Biology: B lymphocytes (B cells)
Overview of B cells (B lymphocytes) and how they are activated and produce antibodies. Biology Life is beautiful! From atoms to cells, from…
VideoFree14 minutes
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Biology: Tertiary structure of proteins
How side chain interactions can impact the tertiary structure of proteins. Biology Life is beautiful! From atoms to cells, from genes to pr…
VideoFree7 minutes
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High school biology: Introduction to the cell
Introduction to the cell High school biology Basic cell structures We'll learn about the complex and beautiful structures you can find insi…
VideoFree6
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Biology: Cytotoxic T cells and MHC I complexes
How damaged cells present antigens from inside the cell on MHC I and are recognized by cytotoxic T cells. Biology Life is beautiful! From a…
VideoFree9 minutes
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Chemistry: Real vs ideal gas behavior
Ideal gas law assumptions, and when they break down. What happens to pressure and volume at low T and high P. Chemistry Did you know that e…
VideoFree11 minutes
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Organic chemistry: Optical activity calculations
How to calculate specific rotation and % enantiomeric excess Organic chemistry Sal and Jay cover topics covered in college organic chemistr…
VideoFree8 minutes
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Biology: CAM plants
How CAM Plants are able to fix carbon at night so they don't have to keep their stomata open during the day. Biology Life is beautiful! Fro…
VideoFree9 minutes
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Organic chemistry: Alkene nomenclature
Rules for naming alkenes (molecules containing a carbon-carbon double bond). Organic chemistry Sal and Jay cover topics covered in college …
VideoFree8 minutes
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Chemistry: 2015 AP Chemistry free response 6
Melting points of salts, and writing the net ionic equations for a basic salt solution. From 2015 AP Chemistry free response 6. Chemistry D…
VideoFree13 minutes
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Biology: DNA cloning and recombinant DNA
Introduction to DNA cloning Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology…
VideoFree11 minutes
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Organic chemistry: Using a pKa table
How to use a pKa table to determine relative acid strengths Organic chemistry Sal and Jay cover topics covered in college organic chemistry…
VideoFree9 minutes
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Biology: First living things on land clarification
First living things on land clarification (This video copyrighted under Create Commons Attribution and Share-Alike CC-BY-SA license) Biolog…
VideoFree6 minutes
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Biology: Animal development: We're just tubes
Hank discusses the process by which organisms grow and develop, maintaining that, in the end, we're all just tubes. Biology Life is beautif…
VideoFree11 minutes