Khan Academy
Free Radical Reactions, Substitution and Elimination Reactions, Organic Chemistry
Explain the concentration of free radicals and how they interact with ions and charged molecules.
Khan Academy
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.
Khan Academy
Chiral Examples 1, Stereochemistry, Organic Chemistry
Sal's video is a selection of structure diagramming examples. Sal draws each out and demonstrates whether each is chiral or not. The video also presents a large number of relevant terms and reviews the nomenclature of conformations.
Khan Academy
Red Shift, Scale of the Universe, Cosmology and Astronomy
The Red Shift concept can be one of the most confusing in physics. Learners may find it helpful to start with learning more about the Doppler Effect before introducing this video.
Khan Academy
Naming Alkyl Halides, Substitution and Elimination Reactions, Organic Chemistry
Sal introduces the elements other than carbon that can branch off the main chain of a hydrocarbon. The examples in this video have double bonds, and the practice involves many of the nomenclature rules that he has already covered.
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Organic Chemistry Naming Examples 3, Organic Chemistry
In the third of five videos, Sal continues to work through examples of more complicated carbon chains.
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Plate Tectonics: Difference Between Crust and Lithosphere, Cosmology and Astronomy
Explore the tectonic plates that make up the surface of our Earth and their movement, as well as the terminology of the Earth's structure.
Khan Academy
Entegegen-Zusammen Naming Scheme for Alkene Examples, Organic Chemistry
Salman Khan works through several isomer diagrams and confirms which is named "cis" or "trans", "e" or "z".
Khan Academy
Amine Naming Introduction, Amines, Organic chemistry
The naming rules that Salman Khan recaps at the start of this video will be more useful with another lecture or previous videos. However, by talking about different groups, Sal can explain some of the characteristic behavior and the...
Khan Academy
Cis-Trans and E-Z Naming Scheme for Alkenes, Alkenes and Alkynes, Organic chemistry
Sal diagrams the but-2-ene molecule. He gives the vocabulary used to describe alkenes of the same formula but different structure.
Khan Academy
Stellar Parallax Clarification, Cosmology and Astronomy
A short clarification begins where the last video on stellar distance left off. It intends to clarify the trigonometry involved in using Parallax to determine stellar distance. The instructor uses the equations from the previous video to...
Khan Academy
Radius of Observable Universe (Correction), Cosmology and Astronomy
A two-minute video corrects a slight error in the previous Khan Academy video about the observable universe. Sal points out that 300,000 years does not significantly impact the number 13.7 billion, or the estimated time of the Big Bang.
Khan Academy
Supernova Clarification, Stars, Black Holes and Galaxies, Cosmology and Astronomy
In need of clarification on the last Khan Academy video on supernova? A short video explains that while humans observed the event that became the Crab Nebula 1,000 years ago, the actual event occurred 7,500 years ago.
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 6)
Sal reinforces the concepts taught in the first video on Singapore's four-digit addition with a series of addition problems. The video would be an excellent homework assignment. Ask your class to view it at home and write a paragraph on...
Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 7)
Third graders use zero, four, and five to make as many three-digit numbers as possible. Sal explains that to make the largest number possible, one must put the largest number in the highest place. Each step and Sal's thought process is...
Khan Academy
MTEL Math Practice Test: 12-15
This video discusses prime factorization and prime or natural numbers. Sal shows viewers how to solve these problems and one with expressions representing a given volume.
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Singapore Math: Grade 3a, Unit 2 (Part 11)
Solving two-step word problems is a great way to build strong critical thinking and creative problem-solving skills. This video showcases three-word problems involving multi-digit addition or subtraction. Sal highlights essential...
Khan Academy
MTEL Math Practice Test: 36-40
Sal goes into detail when solving these problems on the practice MTEL math test, especially the complicated details of question 36. Viewers will rest assured of the ease with which Sal addresses these increasingly tricky problems.
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 10)
Sal solves several practice problems in several ways to reinforce four-digit subtraction. He then takes viewers through solving word problems with four-digit subtraction, which requires regrouping. Use these problems as a class challenge...
Khan Academy
MTEL Math Practice Test: 41-45
Finishing up this practice MTEL Math test, Sal guides the viewer through questions 41-45, explaining his thought processes. The problem set in this video features skills such as median and mean, percentages, and probability, all of which...
Khan Academy
MTEL Math Practice Test: 5-8
In this video, covering questions 5-8, Sal demonstrates test-taking skills (reading a question properly, analyzing all possible choices) and pre-algebra-level skills. He guides viewers through problems involving simplifying expressions,...
Khan Academy
MTEL Math Practice Test: 9-11
This MTEL practice video focuses on problems 9-11, which include skill sets such as reading number lines and inequalities. Sal guides viewers through reading the question and working the equations with simple narration and colorful...
Khan Academy
MTEL Math Practice Test: 20-23
This video, helpful for even the most seasoned math teacher, demonstrates not only mathematical skills and equations but also the test-taking strategies necessary to choose the correct answer. On question 22, Sal explores an alternate...
Khan Academy
MTEL Math Practice Test: 24-27
In this video, Sal guides viewers through questions 24-27 of the MTEL Practice Math Test, showing them how to read the problems carefully and solve the equations correctly. He uses the process of elimination in a few questions, modeling...