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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Organic chemistry: Introduction to reaction mechanisms
Introduction to Reaction Mechanisms . Addition reaction to an alkene Organic chemistry Sal and Jay cover topics covered in college organic …
VideoFree11 minutes
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Organic chemistry: Aromatic stability V
Aromaticity of polycyclic compounds, such as naphthalene. Organic chemistry Sal and Jay cover topics covered in college organic chemistry c…
VideoFree9 minutes
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Chemistry: Mini-video on ion size
Correcting a mistake and learning a bit about ion size Chemistry Did you know that everything is made out of chemicals? Chemistry is the st…
VideoFree3 minutes
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Organic chemistry: Synthesis of substituted benzene rings II
Synthesis practice problems. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…
VideoFree8 minutes
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Class 11 Physics (India): Doppler effect formula for observed frequency
Let's derive the formula for how the perceived frequency of a sound changes when its source is moving toward you Class 11 Physics (India) L…
VideoFree10 minutes
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Class 11 Physics (India): Relative speed of sound in solids, liquids, and gases
Sounds travels at different speeds in different media Class 11 Physics (India) Let's learn, practice, and master topics of class 11 physics…
VideoFree3 minutes
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Class 11 Physics (India): Boltzmann's constant
Class 11 Physics (India) Let's learn, practice, and master topics of class 11 physics (NCERT) starting with kinematics and then moving to d…
VideoFree10
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Class 11 Physics (India): Rules of significant figures
Learn the "rules of thumb" for significant figures. Class 11 Physics (India) Let's learn, practice, and master topics of class 11 physics (…
VideoFree6
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Class 11 Physics (India): Introduction to harmonic motion
Harmonic motion refers to the motion an oscillating mass experiences when the restoring force is proportional to the displacement, but in …
VideoFree10 minutes
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Organic chemistry: Physical properties of aldehydes and ketones
Where the names "aldehyde" and "ketone" come from. Physical properties of aldehydes and ketones. Organic chemistry Sal and Jay cover topics…
VideoFree10 minutes
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Chemistry: Solubility from the solubility product constant
Calculating the solubility of copper(II) hydroxide from Ksp using an ICE table. Chemistry Did you know that everything is made out of chemi…
VideoFree9 minutes
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Class 11 Physics (India): Indefinite integrals of sin(x), cos(x), and eˣ
∫sin(x)dx=-cos(x)+C, ∫cos(x)dx=sin(x)+C, and ∫eˣdx=eˣ+C. Learn why this is so and see worked examples. Class 11 Physics (India) Let's learn…
VideoFree4
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Chemistry: Solubility and complex ion formation
Calculating the solubility of silver chloride in pure water and 3.0 M ammonia. Calculating new equilibrium constant to account for formatio…
VideoFree15 minutes
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Chemistry: Practice determining oxidation states
Determining oxidation numbers in magnesium oxide and magnesium hydroxide. Chemistry Did you know that everything is made out of chemicals? …
VideoFree4 minutes
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Organic chemistry: Stabilization of a conjugate base: solvation
How the solvent affects the stability of a conjugate base Organic chemistry Sal and Jay cover topics covered in college organic chemistry c…
VideoFree4 minutes