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: Balancing more complex chemical equations
Example of balancing the combustion reaction of ethylene, C₂H₄. Some tips on how to balance more complicated reactions. Chemistry Did you k…
VideoFree5 minutes
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Organic chemistry: Disubstituted cyclohexane
How to draw chair conformations for disubstituted cyclohexane Organic chemistry Sal and Jay cover topics covered in college organic chemist…
VideoFree11 minutes
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Biology: Molecular structure of DNA
Molecular structure of DNA. Nucleotide. Nitrogenous base, phosphate. Biology Life is beautiful! From atoms to cells, from genes to proteins…
VideoFree13 minutes
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Biology: Ecological succession
Communities are dynamic and change over time, and we can observe this process with particular clarity after a disturbance or on new land. L…
VideoFree5 minutes
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High school biology: Meet the lungs
Every time you take a breath, oxygen makes it way into your lungs. Follow along on that journey! Rishi is a pediatric infectious disease ph…
VideoFree10 minutes
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Chemistry: Catalysts
How a catalyst speeds up a reaction by lowering the activation energy. Chemistry Did you know that everything is made out of chemicals? Che…
VideoFree8 minutes
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Chemistry: 2015 AP Chemistry free response 3f
Analyzing concentrations when pH lower than half-equivalence point. From 2015 AP Chemistry free response 3f. Chemistry Did you know that ev…
VideoFree5 minutes
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Biology: Hardy-Weinberg equation
This equation relates allele frequencies to genotype frequencies for populations in Hardy-Weinberg equilibrium. Biology Life is beautiful! …
VideoFree8 minutes
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Organic chemistry: Acid chloride formation
Acetic acid to acetyl chloride mechanism. Can be generalized to forming any acid halide from a carboxylic acid. Organic chemistry Sal and J…
VideoFree12 minutes
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Biology: Complex animals: Annelids & arthropods
Hank continues our exploration of animal phyla with the more complexly organized annelida and arthropoda, and a biolography on insects. Bio…
VideoFree13 minutes
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Biology: Introduction to heredity
Heredity and Classical Genetics. Dominant and recessive traits. Heterozygous and homozygous genotypes. Biology Life is beautiful! From atom…
VideoFree17 minutes
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Biology: Population genetics: When Darwin met Mendel
Hank talks about population genetics, which helps to explain the evolution of populations over time by combing the principles of Mendel and…
VideoFree11 minutes
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Biology: Translation (mRNA to protein)
A deep dive into how mRNA is translated into proteins with the help of ribosomes and tRNA. Biology Life is beautiful! From atoms to cells, …
VideoFree14 minutes
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Biology: Alleles and genes
A gene as a stretch of DNA on a chromosome. Alleles as versions (sequence variants) of a gene. Biology Life is beautiful! From atoms to cel…
VideoFree8 minutes
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Organic chemistry: Naming two isobutyl groups systematically
Systematic naming conventions for molecules with two isopropyl groups. Organic chemistry Sal and Jay cover topics covered in college organi…
VideoFree3 minutes