Khan Academy
Systems of Equations with Elimination (and Manipulation), High School Math
Sal begins this video by "massaging the equations slightly to prepare them for elimination." The equations won't be the only relaxed part of this lesson, which introduces the concept of multiplication to systems of equations. Viewers...
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Relative Stability of Amides Esters Anhydrides and Acyl Chlorides
Sal finishes naming the structure from the previous video and the methyl acetate (methyl ethanoate). He then starts comparing the four carboxylic acid derivatives. Sal looks at the resonance structures of the molecules and how...
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Phase Diagrams, States of Matter and Intermolecular Forces, Chemistry
In his previous videos, Sal showed students how to calculate how much energy is needed to change various amounts of water from state to state when the atmospheric pressure is constant. In this video, he shows students how to use phase...
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Hess's Law and Reaction Enthalpy Change, Chemistry
Sal introduces students to Hess's Law. The law states that a process's energy change is independent of how we get from one state to another. He sets up a series of reactions and solves them to illustrate the principles behind Hess's Law....
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Mitosis, Cells, MCAT
The lecturer starts by emphasizing that the mitotic process is a separate mechanism from cytokinesis—the cytoplasm splitting to become two cells. The video continues by explaining the stages of mitosis in great detail. Each stage is...
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Dividing Mixed Numbers, Fractions, Pre-Algebra
Before Sal can divide a mixed number, he has to rewrite it as an improper fraction. He explains that dividing a fraction is the same as multiplying it by its reciprocal and that you can "cancel out" numbers to make multiplying easier.
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Sodium-Potassium Pump, Cells, MCAT
Building upon the previous video about structure, this resource lays the building blocks for generating an action potential and transmitting a signal from dendrites through the axon. The topics are pretty detailed. Salman Khan also talks...
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Solving Rational Equations 2, Polynomial and Rational Functions, Algebra II
This video focuses on rational expressions and completes Sal's lecture series on working with and solving this particular type of equation. Its length would be ideal for a computer lab visit or homework assignment (in conjunction with a...
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Bacteria
There is an essential distinction between the bacteria most students recognize as having a negative impact and those living in a symbiotic relationship with us. Sal looks at how bacteria accumulate variation and how they impact our...
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More Examples of Factoring Quadratics with a Leading Coefficient of 1, Algebra II
Focusing on the intuitive nature of algebra and factoring, Sal demonstrates how to factor quadratic equations efficiently. This video would be great to show in class after a lecture on quadratics or to assign in a computer lab (or...
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Equations And Inequalities
Several problems involving inequalities and defining the variables are a piece of cake for Sal, and they will be to your Algebra pupils as well after they watch this video. Sal's careful explanation and explicit annotations are key to...
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Graphing a Parabola Using Roots and Vertex, Quadratic Equations, Algebra I
After correcting the last problem in his previous video, Sal explains how to graph quadratic functions. Those with difficulty graphing algebraic functions will find Sal's instruction and easygoing manner a welcome change from staring at...
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More Examples of Addition and Subtraction of Polynomials, Algebra II
Though they " sound like a really fancy word," polynomials prove to be no match for Sal's mathematical skills. After defining the term and providing a few examples, Sal works through a few equations that add or subtract polynomials,...
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Graphs of Square-Root Functions, Functions and Their Graphs, Algebra II
Though Sal expects viewers to be "reasonably familiar" with square roots, he takes this opportunity to explain some of the notation and how to graph square root functions. He uses a graphing calculator from my.hrw.com/math06 to...
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Newman Projections, Alkanes, Cycloalkanes, and Functional Groups, Organic chemistry
Sal starts this video with a short 3D methane molecule structure review. He then continues to demonstrate possible configurations for ethane. A ball-and-stick model is drawn, and viewers will find the labeling of bonds helpful as a...
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Solving Percent Problems, Decimals, Pre-Algebra
Converting percents to decimals, and the other way around, can be tricky. Sal shows young mathematicians how to simplify this process with two sample equations and one word problem.
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Solvent Effects on Sn1 and Sn2 Reactions
Sal reviews the Sn1 and Sn2 reactions with comparable reactants. He discusses which electrons are lost or gained and the conditions that make one or the other process favorable.
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Introduction to Ratios, Ratios, Rates, and Percentages, 6th Grade
Demonstrating the concept of ratios with several simple examples (animals, fruit, girls and boys in class), Sal guides viewers through finding and simplifying ratios. Even those who have difficulty grasping the concept of ratios will...
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Banking 18: Big Picture Discussion
Sal further ponders the meaning of wealth in this video, which explores the values of gold, land, and money. Touching on Adam Smith's definition of wealth, the presentation discusses the philosophy of utility and what different media of...
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Exponent Properties Involving Products, Numbers and Operations, 8th grade
After a short review of exponents, Sal incorporates exponent properties into his sample problems. This video is a great resource for those who need Sal's steady pace of instruction and the challenge of more complicated problems.
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Nucleophilicity (Nucleophile Strength)
Sal explains the details that affect nucleophile strength. He gives examples of electronegativity producing a fluorine anion, iodine becoming iodide, and a molecule such as the hydroxide ion. He compares their polarity, basicity, and...
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Example: Two-Step Equations, Linear Equations, Algebra I
Sal adds a few more steps to these problems as he solves algebraic equations with two steps, though he states that "there's more than one way to do it." Those who become confused by increasingly complicated algebra problems on a test...
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Stereoisomers, Enantiomers, Diastereomers, Constitutional Isomers and Meso Compounds
Sal works through a list of examples that demonstrate and review the different types of compound classification.
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The Discount Rate, Money, Banking and Central Banks, Finance and Capital Markets
What happens when a bank outlends its reserves? Sal answers this question in a video about the discount rate, explaining that it serves as the "lender of last resort" and outlining the possible circumstances that may necessitate such a...