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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 nitrogen cycle

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How nitrogen is recycled in our biosphere in the nitrogen cycle, including nitrogen fixation. Biology Life is beautiful! From atoms to cell…

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High school biology: Example punnet square for sex-linked recessive trait

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Example punnet square for sex-linked recessive trait High school biology Sex linkage Topic: Science Learn about all the sciences, from phys…

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Chemistry: Titration curves and acid-base indicators

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Choosing the best indicator for different titrations depending on the pH at the equivalence point. Chemistry Did you know that everything i…

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Biology: Introduction to metabolism: Anabolism and catabolism

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Overview of metabolism, anabolism, and catabolism. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations…

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Organic chemistry: Dot structures II: Multiple bonds

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How to draw double and triple bonds using dots to represent valence electrons. Organic chemistry Sal and Jay cover topics covered in colleg…

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Biology: Hemoglobin

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Hemoglobin and its role in the circulatory system. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations…

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Biology: Biological molecules - You are what you eat

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Hank talks about the molecules that make up every living thing - carbohydrates, lipids, and proteins - and how we find them in our environm…

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Cosmology and astronomy: Radius of observable universe

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Radius of Observable Universe Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn a…

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Cosmology and astronomy: Detectable civilizations in our galaxy 3

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Reconciling with the traditional Drake Equation Cosmology and astronomy It's a great, big universe out there. In this section of Khan Acade…

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Biology: Biogeochemical cycles overview

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Introduction to how water, carbon, nitrogen, and phosphorus are cycled through ecosystems. Biology Life is beautiful! From atoms to cells, …

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Organic chemistry: Ether naming and introduction

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Ether naming and introduction. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding …

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Chemistry: Introduction to kinetics

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Kinetics is the study of reaction rates and how they are affected. Many factors, such as concentration, pressure, temperature, and enzyme a…

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Chemistry: Relationship between Ka and Kb

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The relationship between Ka and Kb, and pKa and pKb. Examples of finding Ka of a weak acid given Kb of the conjugate base. Chemistry Did yo…

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Biology: Comparative anatomy: What makes us animals

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Hank introduces us to comparative anatomy, which studies the similarities and differences in animal anatomy to support the theory of evolut…

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Biology: The skeletal system: It's ALIVE!

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Hank introduces us to the framework of our bodies, our skeleton, which apart from being the support and protection for all our fleshy parts…