The Structure of an Atom

Students examine atomic structure and the octet rule.

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Common Types of Oxidation-Reduction Reactions

By Debbie McClinton, Dr. Miriam Douglass, Dr. Martin McClinton

Learners identify combination, decomposition, displacement, and combustion types of redox reactions. They also watch a video clip that demonstrates the reaction of sodium and water.

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Mole Ratios in Chemical Equations

By Debbie McClinton, Dr. Miriam Douglass, Dr. Martin McClinton

Learners use the coefficients in a balanced equation to develop the mole ratios of reactants and products involved in the reaction. Five interactive examples illustrate the method, and students test their knowledge by working four problems.

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Ion Charges

By Jill Larson

In this interactive object, the learner practices identifying charges on ions.

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Calculation of Atomic Weight from Isotopic Composition