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We are now ready to pull everything we know about reaction stoichiometry together, and answer the question: Given some initial amount of reactants, what should be present after a chemical reaction goes to completion? The procedure for answering this question is often called the "limiting reagent problem." You'll see why this name is appropriate in the following video.

Shapes, Names, and General Formulas

Because of the nature of ionic and covalent bonds, the materials produced by those bonds tend to have quite different macroscopic properties.

According to the physics of the time, Rutherford's planetary atom should have an extremely short lifetime. Bohr thought about the problem and knew of the emission spectrum of hydrogen. He quickly realized that the two problems were connected and after some thought came up with the Bohr model of the atom. Bohr's model of the atom revolutionized atomic physics.

Photoelectric Effect

Solution stoichiometry allows us to quantify the amount of a substance in a solution.

The Stoichiometry of Product Formation and Percent Yield