| 2021-08-11 | Weak acid–weak base reactions | Acids and bases | AP Chemistry | Khan Academy | 7:11 | 25,623 | |
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| 2021-08-11 | Weak base–strong acid reactions | Acids and bases | AP Chemistry | Khan Academy | 6:28 | 15,664 | |
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| 2021-08-11 | Worked example: Calculating the pH after a weak acid–strong base reaction (excess acid) | 9:04 | 31,903 | |
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| 2021-08-11 | Weak acid–strong base reactions | Acids and bases | AP Chemistry | Khan Academy | 8:02 | 17,031 | |
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| 2021-08-11 | Strong acid–strong base reactions | Acids and bases | AP Chemistry | Khan Academy | 9:29 | 12,686 | |
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| 2021-08-10 | Sal's back to school 2021 message | 2:29 | 158,905 | |
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| 2021-08-06 | LearnStorm 2021 - Khan Academy LearnStorm | 2:25 | 127,195 | |
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| 2021-08-05 | Adaptation and environmental change | High school biology | Khan Academy | 9:18 | 9,756 | Vlog |
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| 2021-07-31 | Factors affecting acid strength | Acids and bases | AP Chemistry | Khan Academy | 8:39 | 25,237 | |
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| 2021-07-31 | Acid–base properties of salts | Acids and bases | AP Chemistry | Khan Academy | 13:33 | 30,106 | |
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| 2021-07-31 | Weak base equilibria | Acids and bases | AP Chemistry | Khan Academy | 9:30 | 5,732 | |
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| 2021-07-31 | Worked example: Finding the percent ionization of a weak acid | AP Chemistry | Khan Academy | 6:50 | 42,649 | |
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| 2021-07-31 | Weak acid equilibria | Acids and bases | AP Chemistry | Khan Academy | 11:10 | 8,790 | |
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| 2021-07-31 | Strong base solutions | Acids and bases | AP Chemistry | Khan Academy | 5:27 | 2,846 | |
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| 2021-07-31 | Strong acid solutions | Acids and bases | AP Chemistry | Khan Academy | 6:18 | 3,730 | |
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| 2021-07-31 | Worked examples: Calculating [H₃O⁺] and pH | Acids and bases | AP Chemistry | Khan Academy | 7:05 | 4,656 | |
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| 2021-07-31 | The pH scale | Acids and bases | AP Chemistry | Khan Academy | 8:49 | 11,788 | |
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| 2021-07-31 | Autoionization of water | Acids and bases | AP Chemistry | Khan Academy | 9:01 | 10,863 | |
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| 2021-07-29 | Digital and analog information | Information Technologies | High School Physics | Khan Academy | 4:11 | 8,886 | Vlog |
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| 2021-07-29 | Wave properties | Wave properties | High School Physics | Khan Academy | 6:48 | 10,975 | |
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| 2021-07-29 | Calculating height using energy | Modeling Energy | High School Physics | Khan Academy | 6:29 | 9,141 | |
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| 2021-07-29 | Calculating velocity using energy | Modeling Energy | High School Physics | Khan Academy | 8:35 | 3,574 | |
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| 2021-07-29 | Natural selection and adaptation | High school biology | Khan Academy | 8:52 | 16,426 | Vlog |
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| 2021-07-28 | Acid Rain| Atmospheric Pollution| AP Environmental science| Khan Academy | 7:41 | 13,144 | |
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| 2021-07-27 | Evolution of group behavior | Evolution and natural selection | High school biology | Khan Academy | 4:14 | 9,235 | Vlog |
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| 2021-07-26 | Ocean acidification| Global Change| AP Environmental science| Khan Academy | 5:25 | 7,067 | |
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| 2021-07-26 | Science, technology, and the environment | High school biology | Khan Academy | 6:25 | 5,271 | Vlog |
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| 2021-07-23 | Solid waste disposal| Aquatic and Terrestrial Pollution| AP Environmental science| Khan Academy | 7:56 | 12,974 | |
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| 2021-07-22 | Extinction | Adaptation and environmental change | High school biology | Khan Academy | 5:33 | 12,282 | Vlog |
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| 2021-07-21 | Species and the environment | High school biology | Khan Academy | 4:23 | 6,463 | Vlog |
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| 2021-07-21 | Introduction to sustainability| Land and water use| AP Environmental science| Khan Academy | 6:21 | 11,993 | |
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| 2021-07-19 | Heat transfer | Thermodynamics | High school physics | Khan Academy | 6:04 | 13,440 | |
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| 2021-07-19 | Solar Energy| Energy Resources and Consumption| AP Environmental science| Khan Academy | 6:48 | 5,850 | |
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| 2021-07-19 | The Indefinite Article | Parts of Speech | Grammar | Khan Academy | 4:43 | 10,202 | |
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| 2021-07-16 | Pollution and human health| Aquatic and Terrestrial Pollution| Khan Academy | 6:26 | 8,599 | |
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| 2021-07-15 | Mendelian inheritance and Punnett squares | High school biology | Khan Academy | 7:24 | 26,127 | Vlog |
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| 2021-07-15 | Sources of genetic variation | Inheritance and variation | High school biology | Khan Academy | 7:55 | 30,043 | Vlog |
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| 2021-07-14 | Homeroom with Sal & David Siegel - Wednesday, July 14 | 31:29 | 5,226 | |
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| 2021-07-14 | Feedback in living systems | Growth and feedback in organisms | High school biology | Khan Academy | 8:15 | 3,725 | Vlog |
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| 2021-07-14 | Inertial Mass vs. Gravitational Mass | Circular motion and gravitation | AP Physics 1 | Khan Academy | 8:12 | 16,057 | |
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| 2021-07-14 | Work-Energy Principle Example | Energy and Momentum | AP Physics 1 | Khan Academy | 7:45 | 5,030 | |
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| 2021-07-14 | Changes in Momentum Worked Examples | Momentum and Impulse | AP Physics 1 | Khan Academy | 9:00 | 8,050 | |
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| 2021-07-14 | Torque Basics | Simple harmonic motion and rotational motion | AP Physics 1 | Khan Academy | 9:40 | 6,768 | |
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| 2021-07-14 | Period of a Pendulum | Simple harmonic motion and rotational motion | AP Physics 1 | Khan Academy | 9:25 | 9,978 | |
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| 2021-07-13 | Dihybrid cross and the Law of Independent Assortment | High school biology | Khan Academy | 9:08 | 85,934 | Vlog |
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| 2021-07-12 | Energy at the microscopic scale | Introduction to energy | High school physics | Khan Academy | 5:58 | 5,696 | |
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| 2021-07-12 | Energy and fields | Introduction to energy | High school physics | Khan Academy | 4:46 | 3,065 | |
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| 2021-07-12 | What is energy? | Introduction to energy | High school physics | Khan Academy | 3:39 | 36,401 | |
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| 2021-07-12 | Calculating gravitational potential energy | Modeling energy | High school physics | Khan Academy | 4:33 | 52,803 | |
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| 2021-07-12 | Calculating kinetic energy | Modeling energy | High school physics | Khan Academy | 5:28 | 10,792 | |
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| 2021-07-12 | Energy in fields | Introduction to energy | High school physics | Khan Academy | 4:31 | 4,476 | |
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| 2021-07-12 | Electromagnetic radiation emission | Electromagnetic Radiation | High School Physics | Khan Academy | 5:21 | 7,613 | |
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| 2021-07-08 | pH and solubility | Equilibrium | AP Chemistry | Khan Academy | 5:14 | 14,392 | |
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| 2021-07-08 | The common-ion effect | Equilibrium | AP Chemistry | Khan Academy | 10:08 | 37,611 | |
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| 2021-07-08 | Worked example: Predicting whether a precipitate forms by comparing Q and Kₛₚ | Khan Academy | 8:16 | 9,819 | |
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| 2021-07-08 | Worked example: Calculating solubility from Kₛₚ | Equilibrium | AP Chemistry | Khan Academy | 4:52 | 9,580 | |
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| 2021-07-08 | Introduction to solubility equilibria | Equilibrium | AP Chemistry | Khan Academy | 8:17 | 39,385 | |
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| 2021-07-08 | Worked example: Using Le Chȃtelier’s principle to predict shifts in equilibrium | Khan Academy | 3:58 | 3,894 | |
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| 2021-07-08 | Worked example: Calculating the equilibrium total pressure after a change in volume | Khan Academy | 7:11 | 7,240 | |
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| 2021-07-08 | Le Chȃtelier’s principle: Changing temperature | Equilibrium | AP Chemistry | Khan Academy | 11:16 | 17,699 | |
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| 2021-07-08 | Le Chȃtelier’s principle: Changing volume | Equilibrium | AP Chemistry | Khan Academy | 11:09 | 8,594 | |
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| 2021-07-08 | Le Chȃtelier’s principle: Changing concentration | Equilibrium | AP Chemistry | Khan Academy | 8:38 | 6,849 | |
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| 2021-07-08 | Worked example: Using the reaction quotient to find equilibrium partial pressures | Khan Academy | 6:31 | 17,642 | |
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| 2021-07-08 | Using the reaction quotient | Equilibrium | AP Chemistry | Khan Academy | 7:50 | 6,488 | |
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| 2021-07-08 | Worked example: Calculating equilibrium concentrations from initial concentrations | Khan Academy | 5:29 | 83,404 | |
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| 2021-07-08 | Worked example: Calculating an equilibrium constant from initial and equilibrium pressures | 4:51 | 31,942 | |
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| 2021-07-08 | Properties of the equilibrium constant | Equilibrium | AP Chemistry | Khan Academy | 6:36 | 4,912 | |
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| 2021-07-08 | Magnitude of the equilibrium constant | Equilibrium | AP Chemistry | Khan Academy | 6:04 | 3,683 | | Equilibrium
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| 2021-07-08 | Worked examples: Calculating equilibrium constants | Equilibrium | AP Chemistry | Khan Academy | 8:12 | 92,801 | | Equilibrium
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| 2021-07-08 | Writing equilibrium constant and reaction quotient expressions | AP Chemistry | Khan Academy | 7:03 | 8,656 | |
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| 2021-07-08 | Direction of reversible reactions | Equilibrium | AP Chemistry | Khan Academy | 7:28 | 5,442 | |
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| 2021-07-08 | Dynamic equilibrium | Equilibrium | AP Chemistry | Khan Academy | 8:11 | 13,437 | |
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| 2021-07-07 | Biodiversity | Biodiversity and human impacts | High school biology | Khan Academy | 7:51 | 9,944 | Vlog |
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| 2021-07-07 | Formation of biomolecules | Matter and energy in organisms | High school biology | Khan Academy | 7:16 | 3,186 | Vlog |
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| 2021-07-07 | Photosynthesis | Matter and energy in organisms | High school biology | Khan Academy | 10:02 | 10,934 | Vlog |
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| 2021-07-07 | Organization of multicellular organisms | High school biology | Khan Academy | 4:16 | 9,732 | Vlog |
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| 2021-07-07 | Genes, proteins, and cells | Genes, cells, and organisms | High school biology | Khan Academy | 6:53 | 8,634 | Vlog |
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| 2021-07-06 | Greenhouse effect and greenhouse gases| Global change| AP Environmental science| Khan Academy | 6:59 | 66,360 | |
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| 2021-07-01 | Cell specialization | Genes, cells, and organisms | High school biology | Khan Academy | 5:32 | 10,403 | Vlog |
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| 2021-07-01 | Taking and visualizing powers of a complex number | Precalculus | Khan Academy | 6:21 | 6,545 | |
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| 2021-06-29 | Indoor air pollutants| Atmospheric pollution| AP Environmental science| Khan Academy | 6:55 | 21,695 | |
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| 2021-06-29 | Human impact on aquatic environments| AP Environmental science| Khan Academy | 4:42 | 6,741 | |
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| 2021-06-28 | Dividing complex numbers in polar form | Precalculus | Khan Academy | 3:10 | 7,236 | |
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| 2021-06-28 | Multiplying complex numbers in polar form | Precalculus | Khan Academy | 2:27 | 7,337 | |
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| 2021-06-28 | Multiplying complex numbers graphically example: -1-i | Precalculus | Khan Academy | 3:37 | 9,227 | |
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| 2021-06-28 | Multiplying complex numbers graphically example: -3i | Precalculus | Khan Academy | 2:02 | 4,225 | |
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| 2021-06-28 | Converting a complex number from polar to rectangular form | Precalculus | Khan Academy | 2:39 | 7,763 | |
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| 2021-06-24 | Homeroom with Sal & Anant Agarwal - Thursday, June 24 | 33:21 | 8,977 | |
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| 2021-06-22 | Energy Conservation| Energy Resources and Consumption| AP Environmental Science| Khan Academy | 5:57 | 8,546 | |
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| 2021-06-22 | Reduction of Air Pollutants| Atmospheric Pollution| AP Environmental Science| Khan Academy | 6:38 | 8,064 | |
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| 2021-06-22 | Nuclear Power Generation| Fuel Types and Uses I| AP Environmental Science| Khan Academy | 7:19 | 11,911 | |
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| 2021-06-21 | Student tips for using course mastery on Khan Academy | 4:05 | 6,944 | |
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| 2021-06-21 | Student tips for completing assignments on Khan Academy | 5:02 | 6,674 | |
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| 2021-06-15 | Khan Academy Ed Talks with Barbara Oakley, Phd - Thursday, June 15 | 33:45 | 12,880 | |
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| 2021-06-01 | Khan Academy Ed Talks with Olav Schewe - Tuesday, June 1 | 31:14 | 21,087 | |
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| 2021-05-30 | Impacts of Urbanization| AP Environmental science| Khan Academy | 6:19 | 27,648 | |
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| 2021-05-30 | Impacts of Agricultural Practices| Land and water use| AP Environmental science| Khan Academy | 7:39 | 10,036 | |
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| 2021-05-30 | Global wind patterns| Earth systems and resources| AP environmental science| Khan Academy | 6:23 | 25,949 | |
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| 2021-05-30 | El Niño and La Niña| Earth systems and resources| AP Environmental science| Khan Academy | 6:56 | 31,670 | |
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| 2021-05-30 | Soil Texture Triangle| Earth systems and resources| AP environmental science| Khan Academy | 6:24 | 9,975 | |
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