Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 2)
By working through word problems involving subtraction and using numbers in the hundreds, the instructor uses visual cues to help viewers understand how to solve the problem. The instructor's method for solving the problem involves...
Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 5)
A video on Singapore Math uses a visual approach to understanding place value. It quizzes viewers on material learned about number sense. The instructor breaks down a large number, identifying the values in the thousands, hundreds, tens,...
Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 6)
A helpful video takes a deeper look at place value by identifying numbers of greater and lesser value using a visual approach. It would be a great way to solidify concepts for those who learn visually. Using bright colors and grouping...
Khan Academy
Pi Bonds and Sp2 Hybridized Orbitals, Structure and Bonding, Organic chemistry
The sigma bonds and overlapping of s or p orbitals are the focus of an informative video. Your class will find SalÕs explanations and recaps very useful. He introduces pi bonds and draws examples of the single and double bonds.
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Zaitsev's Rule, Substitution and Elimination Reactions, Organic chemistry
Discuss the likelihood of ions donating electrons and then forming double bonds with an educational video. It demonstrates the methods for determining which molecules will react with others. Your class will appreciate the review.
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Addition of Water (Acid-Catalyzed) Mechanism, Organic Chemistry
Sal starts this lecture by presenting the question as it might appear in a test or chemistry problem set. After reviewing the naming of a molecule and then drawing it to clarify the electron arrangement, he explains how to determine the...
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Bromination of Benzene, Aromatic Compounds, Organic Chemistry
Starting with a diagram of a concrete example of electrophilic aromatic substitution, this video recaps diagrams of the electrophile behavior and how they "attack" relatively stable carbocations.
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Resonance
First, Sal compares a benzene ring to cyclohexane. He introduces the concept of resonance and uses Lewis structures to demonstrate that there is an electron cloud surrounding the entire benzene ring, rather than a "flip-flopping" between...
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Alcohol Properties, Alcohols, Ethers, Epoxides, Sulfides, Organic Chemistry
The properties of water, such as electronegativity, are related to its physical behavior. Water's boiling point, miscibility, and solubility are compared to those of other substances and related to van der Waals forces.
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Carboxylic Acid Introduction, Carboxylic Acids and Derivatives, Organic Chemistry
Sal defines the similarity of the carbonyl group on an aldehyde to that of a carboxylic acid. Next, he clarifies the presence of the extra OH group instead of the carbon chain or hydrogen. He then recaps the definitions and behaviors of...
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Ketone Naming, Aldehydes and Ketones, Organic chemistry
Starting with the distinctions between Ketones and Aldehydes, Sal diagrams the groups that affect the naming.
Khan Academy
Naming Benzene Derivatives Introduction, Aromatic Compounds, Organic Chemistry
Familiarize your class with the benzene derivative compounds. Some Sal will recommend memorizing, while others are mainly presented as practice for naming.
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Chiral Examples 2, Stereochemistry, Organic chemistry
After providing two more examples of diagramming in different ways, Sal reviews that a molecule that cannot be superimposed on its own mirror image is defined as chiral. The terms given to the chiral center carbon are provided.
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Amine Naming Introduction, Amines, Organic chemistry
An introduction to the structure of amines and the definition of nitrogen bonded to carbon groups. Naming amines is the primary focus and will help students recognize the compounds if they come across the important terms again.
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Introduction to Chirality, Stereochemistry, Organic chemistry
An introduction to chirality and whether molecules can be superimposed or not. The terminology for those molecules is given along with the relevance of that characteristic.
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Alcohols, Alcohols, Ethers, Epoxides, Sulfides, Organic chemistry
Sal approaches the functional group OH. He gives details of the term alcohol and clarifies the differences from drinking alcohol. Again, there is practice in naming molecules and identifying the location of functional groups.
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Subtracting Fractions with Like Denominators
Elementary school students can observe Sal as he subtracts fractions that have a common denominator. Because this concept is fairly straight forward, he focuses on simplifying his answer. A great video for those needing extra support in...
Khan Academy
What is Inside a DVD Player? (5 of 5), Electrical engineering
You probably know that a laser is used in a DVD player, but how exactly does it work? The last of five videos explains the laser setup in the DVD player and how it transmits stored information. The video begins with a drawing and ends...
Khan Academy
Compare the Hair Dryer Motor to the One You Can Build
Could you build a motor for a hair dryer? Viewers of a short video watch as the narrator compares a hair dryer motor to an electric motor built from a kit. Each component of the hair dryer motor correlates to a component in the electric...
Khan Academy
Mouse Interaction, Computer Programming
Drawing objects based on where the user's mouse is located can be a beneficial and fun coding activity for new JavaScript coders. Here, the speaker shows how to use the mouseY and mouseX variables in a small section of code that draws a...
Khan Academy
Cosmological Time Scale 1, Scale of the Universe, Cosmology and Astronomy
A scaled timeline highlights periods relevant to us since the Big Bang. Events on the timeline include the formation of Earth, the extinction of dinosaurs, and the emergence of modern humans.
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Plate Tectonics: Geological Features of Divergent Plate Boundaries
Sal explains the mechanism of crust lift developing at hot spots. The density changes at that point, continuing to cause depressions. The depressions and thinner layers fill with water, resulting in a flooded rift valley.
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Intergalactic Scale, Scale of the Universe, Cosmology and Astronomy
Sal narrates the last video, concentrating on the scale between stars and galaxies themselves.
Khan Academy
Double Newman Diagram for Methcyclohexane
Help your class visualize cyclical ring-based carbon molecules. He translates a sawhorse projection into a "Double Newman" diagram, which helps clarify the respective energies and stabilities of molecules.