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Hank tells us the background story and explains the importance of the science of classifying living things, also known as taxonomy. Biology…

The relationship between standard Gibbs free energy change and the equilibrium constant K. Calculating K when you know the standard free en…

Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

sp² hybrid orbitals and properties of pi bonds. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of …

Newman Projections 2 Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic h…

Why Gravity Gets So Strong Near Dense Objects Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy…

Bronsted-Lowry and Arrhenius definitions of acids and bases. Organic chemistry Sal and Jay cover topics covered in college organic chemistr…

How formal charges and oxidation states are both ways of counting electrons Organic chemistry Sal and Jay cover topics covered in college o…

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…

Here's a chance to see if you can combine what you know to add up resistance in series AND in parallel. Rishi is a pediatric infectious dis…

Calculating the concentration of weak base using information about equivalence point in a titration. From 2015 AP Chemistry free response 3…

Eisenmenger's syndrome is when blood in the heart shunts from right-to-left due to increased pressure in the right ventricle. This increase…

Definition of reaction rate, and examples of calculating the average rate of reaction. Chemistry Did you know that everything is made out o…