Learners examine the periodic table to identify metallic elements that have either fixed or variable oxidation states.

Learners examine a table of common polyatomic ions. Eight examples are provided for practice.

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.

In this animated object, students examine the role equilibrium plays in everyday life. Formulas are presented in an interactive way.

In this animated object, learners examine the structure and function of intracellular and extracellular fluid. They also read about the most common electrolytes in the body and complete a matching exercise to test their knowledge.

Students listen to three telephone messages and enter their evaluation of each one. They then read a list of guidelines for leaving effective messages.

In this learning activity you'll identify the various parts of a bar graph, read and interpret its data, and calculate the data to solve various application problems.

In this learning activity you'll establish your budget by determining your earnings, expenses, and goals.

In this learning activity you'll explore how units in the metric system are related to each other and practice locating measurements on a metric line.

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Introduction matter

Review important vocabulary relating to properties of matter.