In this interactive object, students examine a type of chemical bond known as the "hydrogen bond."

Learners examine the method used to calculate the mass percent of an element in a compound. Three examples and one problem illustrate the method.

Vapor pressure is the pressure exerted by molecules in the gas phase in equilibrium with a liquid or a solid. Two examples are used to illustrate vapor pressure: the drying of clothes and the evaporation of ice.

In this animated activity, learners examine the terms "half-reaction," "oxidizing agent," and "reducing agent" and follow five interactive examples to balance equations for oxidation-reduction reactions. Three problems are provided as a self-check.