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: 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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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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Chemistry: Entropy: Embrace the chaos
Life is chaos and the universe tends toward disorder. But why? If you think about it, there are only a few ways for things to be arranged i…
VideoFree13 minutes
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Chemistry: Titration roundup
Making sure you fully understand titration curves by comparing the initial pH and pH at equivalence point for different types. Chemistry Di…
VideoFree11 minutes
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Cosmology and astronomy: Detectable civilizations in our galaxy 5
More reasons why we haven't detected anything yet. Cosmology and astronomy It's a great, big universe out there. In this section of Khan Ac…
VideoFree5 minutes
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Biology: Sex-linked traits
Sex-linked traits are associated with genes found on sex chromosomes. In humans, the sex chromosomes are X and Y. Because the X-chromosome …
VideoFree14 minutes
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Chemistry: Titration calculation example
Example of titrating strong acid, hydrochloric acid, with strong base barium hydroxide. How to calculate the unknown concentration when you…
VideoFree8 minutes
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Organic chemistry: Ka and pKa review
A short review of Ka and pKa for students taking organic chemistry Organic chemistry Sal and Jay cover topics covered in college organic ch…
VideoFree3 minutes
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Chemistry: Worked example: Identifying isotopes and ions
Identifying isotopes and ions from the number of electrons, protons and neutrons, and vice versa. Chemistry Did you know that everything is…
VideoFree4 minutes
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Organic chemistry: Naming cubane
Systematic naming of cubane. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…
VideoFree6 minutes
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Biology: Photosynthesis: Overview of the light-dependent reactions
Overview of the light-dependent reactions, including the structure of the chloroplast, the photosystems, and how ATP is synthesized. Biolog…
VideoFree20 minutes
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Cosmology and astronomy: Hawaiian islands formation
The Hawaiian Islands formed primarily as a result of volcanic activity. While most islands form near tectonic plate boundaries, the Hawaii…
VideoFree8 minutes
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Biology: Dehydration synthesis or a condensation reaction
Dehydration synthesis (condensation reaction) between sugar molecules. Monosaccharides, disaccharides, and polysaccharides. Formation of ma…
VideoFree10 minutes
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Biology: Lactic acid fermentation
Lactic acid fermentation. How organisms like lactobacillus convert pyruvic acid to lactic acid and oxidize NADH to NAD+ in the process. Bio…
VideoFree11 minutes
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Biology: Photosynthesis
Overview of photosynthesis. What photosynthesis accomplishes, why it's important, and how the light-dependent and light-independent reactio…
VideoFree14 minutes