In this well-illustrated activity, learners examine the three types of intermolecular forces: dipole-dipole forces, London or Van der Waals forces, and the hydrogen bond. Two interactive questions are included.

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

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

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

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

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

Boyle's Law states that gas volume varies inversely with the pressure at constant temperature and is described by the equation PV = constant. An example of a sample of gas at two conditions of P and V is used to illustrate the law.

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.

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

Learners complete an exercise to match chemical formulas with the names of binary compounds, tertiary compounds, and ions.

Atomic weights are used to convert the mass of a sample into the number of moles of the element in the sample and vice versa. Four examples are provided for practice.

In this interactive and animated object, learners use solubility rules to predict when an insoluble ionic compound will precipitate in a double replacement reaction. Step-by-step examples are given.

Learners examine how vapor pressure is calculated. The vapor pressure of a liquid increases with increasing temperature. If the heat of vaporization and the vapor pressure at one temperature are known, the vapor pressure at a second temperature can be calculated.

Learners view several movie clips that demonstrate the use of an indicator to follow the neutralization reaction that occurs when an acid and a base are mixed. Students test their knowledge in a series of questions. Immediate feedback is given.

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

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

Learners examine the meaning of theoretical yield, actual yield, and percent yield. They test their knowledge by solving two problems.