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: 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
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Chemistry: Elements and atoms
How elements relate to atoms. The basics of how protons, electrons, and neutrons make up an atom. Chemistry Did you know that everything is…
VideoFree13 minutes
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Biology: Mitochondria
The structure and role of mitochondria (plural for mitochondrion). Outer membrane, inner membrane, cristae, porins, etc. Biology Life is be…
VideoFree14 minutes
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Organic chemistry: Alkene structure and classification
Introduction to alkenes: geometry and rotation about the double bond and stability of differently substituted forms. Organic chemistry Sal …
VideoFree8 minutes
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Organic chemistry: Formation of oximes and hydrazones
How aldehydes and ketones can react with hydroxylamine to form oximes or hydrazine to form hydrazones. Organic chemistry Sal and Jay cover …
VideoFree10 minutes
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Chemistry: Ways to get a buffer solution
Describes the two main situations where you get a buffer: making a buffer for a specific pH by combining a weak acid and a salt containing …
VideoFree8 minutes
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Organic chemistry: Symmetric and asymmetric stretching
How symmetric and asymmetric stretching of two identical groups can lead to two distinct signals in IR spectroscopy. Organic chemistry Sal …
VideoFree11 minutes
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Organic chemistry: Mixed (crossed) aldol condensation using a lithium enolate
How to direct a mixed aldol condensation using a lithium enolate. Organic chemistry Sal and Jay cover topics covered in college organic che…
VideoFree9 minutes
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Biology: Osmosis
Osmosis of water from an area of lower to an area of higher solute concentration across a semipermeable membrane. Biology Life is beautiful…
VideoFree8 minutes
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Chemistry: Stoichiometry example problem 1
Figuring out grams of reactants and product produced from reaction of phosphorous and chlorine. Chemistry Did you know that everything is m…
VideoFree14 minutes