# Khan Academy

In other videos, we saw how we can use matrices to represent real-world situations. Once we do that, we can also manipulate the matrices (using...

In other videos, we saw how we can use matrices to represent real-world situations. Once we do that, we can also manipulate the matrices (using...

To write the empirical formula for an ionic compound, we use the periodic table to identify the metallic cation and the nonmetallic anion and write...

The arrangement of the periodic table by increasing atomic number places elements with similar chemical properties in the same columns (groups)....

An atom is the smallest unit of an element that still maintains the properties of that element. Each atom has a charged substructure consisting of...

Forces at a distance are explained by fields (gravitational, electric, and magnetic) permeating space that can transfer energy through space....

Momentum is defined for a particular frame of reference; it is the mass times the velocity of the object. Khan Academy is a nonprofit organization...

Systems are collections of objects. Objects can be treated as if they have no internal structure. You can treat a system as an object if the...

In order for objects to exert a contact force, the objects must be touching. Common examples of contact forces include tension, the normal force,...

Matrices are basically tables of numeric values. But you may be surprised at how many real-world situations you can model with this structure....

Matrices are basically tables of numeric values. But you may be surprised at how many real-world situations you can model with this structure....

From neuroscience to pandemic parenting, to how to best plan for Valentine's Day this weekend. Mayim Bialik, host of #BialikBreakdown joins...