8 videos
4E: A cake recipe calls for 2 eggs and 4 cups of flour, but you have 3 eggs, and 3 cups of flour. In this example, flour is our limiting reagent, that is, its small amount preventing you from completing the reaction of making the cake since we do not have enough (while we have more than enough eggs to make the cake). We’ll extend this simple example to chemical reactions with atoms and molecules. You'll learn to balance chemical reactions, a concept that will be applied to several other problems in chemistry.

Molecular and empirical formulas

VIDEO 15:54 minutes
Introduction to molecular and empirical formulas. Calculating molecular mass.

The mole and Avogadro's number

VIDEO 9:44 minutes
Introduction to the idea of a mole as a number (vs. an animal).


VIDEO 9:56 minutes
Introduction to stoichiometry.

Stoichiometry example problem 1

VIDEO 13:35 minutes
Figuring grams of reactants and product produced from reaction of phosphorous and chlorine.

Stoichiometry: Limiting reagent

VIDEO 15:04 minutes
Stoichiometry problem where we have a limiting reagent!

Limiting reactant example problem 1

VIDEO 19:20 minutes
Limiting Reactant Example Problem 1

Specific gravity

VIDEO 3:10 minutes
In this video David explains what specific gravity means. He also shows how to calculate the value for specific gravity and use it to determine the percent of an object that will be submerged while floating.