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 …
check_box_outline_blank
Chemistry: Voltage as an intensive property
Demonstrating that voltage is an intensive property by calculating the voltage and change in Gibbs free energy for a half reaction. Chemist…
VideoFree5 minutes
check_box_outline_blank
Biology: Ecosystem biodiversity
Are all coral reefs the same? Each regional ecosystem has its own assemblage of species and each contributes uniquely to global biodiversit…
VideoFree4 minutes
check_box_outline_blank
Organic chemistry: Resonance structure patterns
Examples showing how different types of bond configurations can be represented using resonance structures. Organic chemistry Sal and Jay co…
VideoFree10 minutes
check_box_outline_blank
Cosmology and astronomy: Understanding calendar notation
Difference between BC, BCE, AD and CE. A little bit about the birth of Jesus as well. Cosmology and astronomy It's a great, big universe ou…
VideoFree10 minutes
check_box_outline_blank
Organic chemistry: Organic chemistry naming examples 4
Organic chemistry naming examples 4 Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understan…
VideoFree10 minutes
check_box_outline_blank
Chemistry: Electronegativity
Defines electronegativity and compares to electron affinity. Explains group and period trends in electronegativity using atomic radii. Chem…
VideoFree10 minutes
check_box_outline_blank
Chemistry: Using reduction potentials
Example of using table of standard reduction potentials to calculate standard cell potential. Chemistry Did you know that everything is mad…
VideoFree6 minutes
check_box_outline_blank
Chemistry: Formal charge and dot structures
Definition of formal charge, and how minimization of formal charge can help choose the more stable dot structure. Chemistry Did you know th…
VideoFree12 minutes
check_box_outline_blank
Chemistry: Bronsted-Lowry definition of acids and bases
Bronsted-Lowry definition of acids and bases. Conjugate acids and bases. Chemistry Did you know that everything is made out of chemicals? C…
VideoFree9 minutes
check_box_outline_blank
Biology: Types of immune responses: Innate and adaptive, humoral vs. cell-mediated
Innate vs. adaptive immunity. Humoral adaptive immunity vs. cell-mediated adaptive immunity. Biology Life is beautiful! From atoms to cells…
VideoFree8 minutes
check_box_outline_blank
Biology: Prokaryotic and eukaryotic cells
Prokaryotic and eukaryotic cells. Bacteria and archaea. Biology Life is beautiful! From atoms to cells, from genes to proteins, from popula…
VideoFree7 minutes
check_box_outline_blank
Biology: Community ecology II: Predators
Hank explores adaptations of predators, the evolutionary arms race between predators and prey, and various types of predation (including he…
VideoFree10 minutes
check_box_outline_blank
Biology: Ape clarification
Ape clarification - that they have no tails. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ec…
VideoFree1 minute
check_box_outline_blank
Biology: Interphase
Interphase of the cell cycle, including G₁, S, and G₂ phases. How the cell replicates its DNA before mitosis. Biology Life is beautiful! Fr…
VideoFree8 minutes
check_box_outline_blank
Cosmology and astronomy: How Earth's tilt causes seasons
How Earth's tilt causes seasons Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn…
VideoFree21 minutes