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

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.

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.

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 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.

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.

In this animated object, students are introduced to moles as a measurement.

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.

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

In this screencast, we review the positions of metals, metalloids, and nonmetals in the Periodic Table and the general characteristics of each.

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

In this interactive object, learners determine the limiting reagent and the excess reagent in chemical reactions. Learners test their knowledge by solving three problems.

In this interactive object, learners calculate formula and molecular weights by working through five examples and two problems.

In this animated and interactive object, learners examine kinetic and potential energy as well as the first law of thermodynamics and the flow of energy between a system and its surroundings. Students also answer questions about exothermic and endothermic reactions

In this animated object, students examine the role that the solubility of water plays in various biological functions.

Students examine standard pressure in this interactive object.

In this interactive object, learners calculate the amount of heat evolved or absorbed in chemical reactions. Four practice problems are provided.