Learners read about lab equipment and basic safety measures. In a quiz, they view photos and determine if the lab technicians pictured are using safe practices.

Students use algebra to rearrange formulas and solve for the missing volume, density, or mass quantity.

In this animated object, learners examine the chemistry behind table salt.

In this screencast we are introduced to the lab equipment used to contain and dispense chemicals.

In this screencast, students read about the basic organization and structure of the periodic table of elements. Students identify elements as belonging to a group, a period, or neither.

Students practice identifying common elements from the periodic table by name or symbol.

In this interactive lesson, students examine the quantitative relationship between chemicals in a balanced mathematical equation.

Students read brief descriptions of atoms, molecules, elements, and compounds, and complete a matching exercise that pictures these particles and molecules as pieces of taffy.

Learners examine how chemists use moles to "count" atoms by weight. Examples are given.

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

In this animated and interactive object, learners observe how two, three, or four groups of electrons around the central atom cause the shape of the molecule to be linear, trigonal planar, bent, tetrahedral, or pyramidal. Seven examples and eight interactive questions are provided.

Roman numerals are used to identify the charges on metal cations having multiple oxidation states. Five examples are provided for practice.

Learners follow a four-step process to determine the empirical formula of a compound from the masses of its constituent elements. The molecular formula is determined in a fifth step using the molecular weight of the compound.

In this interactive object, learners examine how to properly dilute hydrochloric acid.

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

In this animated and interactive object, learners follow two rules to write unit conversion fractions.

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.

Students identify the parts of a triple beam balance and practice measuring the mass of objects.

Students solve a molarity problem in a drag and drop exercise.

In this interactive object, learners use the ideal gas law to solve a practice problem.