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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: Sex-linked traits

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Sex-linked traits are associated with genes found on sex chromosomes. In humans, the sex chromosomes are X and Y. Because the X-chromosome …

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Organic chemistry: Naming cubane

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Systematic naming of cubane. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…

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Chemistry: Calorimetry and enthalpy introduction

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Today's episode dives into the HOW of enthalpy. How we calculate it, and how we determine it experimentally...even if our determinations he…

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Biology: 2015 AP Biology free response 6

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Fixing a declining snake population. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems…

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Biology: The scientific method

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How the scientific method is used to ask questions and test explanations. Biology Life is beautiful! From atoms to cells, from genes to pro…

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High school biology: Introduction to the cell

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Introduction to the cell High school biology Basic cell structures We'll learn about the complex and beautiful structures you can find insi…

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Chemistry: Buffers, the acid rain slayer

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In this episode, Hank talks about how nutty our world is via Buffers! He defines buffers and their compositions, talks about carbonate buff…

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Chemistry: 2015 AP Chemistry free response 1a

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Analyzing reactions and cell potential of a metal-air cell. From 2015 AP Chemistry free response 1a. Chemistry Did you know that everything…

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Biology: Krebs / citric acid cycle

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Overview of the Krebs or citric acid cycle, which is a series of reactions that takes in acetyl CoA and produces carbon dioxide, NADH, FADH…

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Organic chemistry: Ka and pKa review

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A short review of Ka and pKa for students taking organic chemistry Organic chemistry Sal and Jay cover topics covered in college organic ch…

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Chemistry: Reactions in equilibrium

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Equilibrium reactions and constants. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of matter: its…

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Biology: Biology overview

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Overview of biology, the study of life. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosyst…

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Biology: 2015 AP Biology free response 7

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Olfactory neurons. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the s…

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Organic chemistry: Elimination vs substitution: secondary substrate

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Examining which types of reactions secondary alkyl halides can undergo. Organic chemistry Sal and Jay cover topics covered in college organ…

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Organic chemistry: Chemical shift

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The formula for calculating chemical shift based on a TMS reference signal and spectrophotometer frequency. Organic chemistry Sal and Jay c…