Khan Academy: Balanced and Unbalanced Forces

Video lesson serves as a primer on identifying balanced and unbalanced forces. [8:11]

Video lecture explores what is true about how unbalanced forces relate to motion and acceleration. [6:36]

Students study several free-body diagrams to better understand balanced and unbalanced forces.

Sal will illustrate how to balance redox reactions in acid. [11:58]

Understand how to balance a redox reaction in a base. [13:57]

Learn about Van der Waals forces, London dispersion forces, dipole-dipole forces, and hydrogen bonding. [11:39]

When balancing equations for redox reactions occurring in acidic solution, it is often necessary to add ions to fully balance the equation. In this video [12:04] we'll walk through this process for the reaction between dichromate and...

A video [5:03] showing how to balance a chemical reaction by making sure you have the same number of atoms of each element on both sides.

A video [4:37] showing how balance more complicated reactions by of balancing the combustion reaction of ethylene.

Practice balancing chemical equations with ten multiple choice questions. Hints are available if needed.