Learners view movie clips to determine the solubility of two ionic compounds. They also examine a solubility chart and predict the solubility of compounds.

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.

Students read an explanation of chemical formulas in this animated activity. A quiz completes the object.

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 brief object, learners examine the direct relationship between the volume of a gas sample and the number of moles of gas. A problem is presented so students can test their knowledge of Avogadro's Law.

In this interactive object, learners identify charges on ions, write new formulas based on charge, and balance equations using coefficients.

In this screencast, learners examine the kinds of physical and chemical changes that occur in substances.

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

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

Learners read definitions of atomic symbols, atomic numbers, and mass numbers and then answer questions about the number of neutrons, protons, and electrons in select elements.

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

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

Learners examine the meaning of oxidation, reduction, and half-reaction, and watch a film showing the deposition of copper metal from the reduction of copper (II) ion by aluminum. A brief quiz completes the activity.

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

In this animated object, students examine what happens when electrons share molecules.

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.

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

Learners convert units used to designate pressure. Units for pressure are atm, mm Hg, torr, and pascal.

Learners examine how the boiling point increases with increasing pressure. An example from industry is given.

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.

The definition of an isotope is illustrated using the three isotopes of carbon. The three isotopes of hydrogen are discussed as exceptions.

In this interactive object, students examine how the volume and temperature of an ideal gas relate under conditions of constant pressure and quantity.

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 follow two rules to write unit conversion fractions.

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