Charles's Law

By Jill Larson

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

Solubility of Ionic Compounds in Water

By Dr. Miriam Douglass, Dr. Martin McClinton

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

Electromagnetic Radiation

By Debbie McClinton, Dr. Miriam Douglass, Dr. Martin McClinton

In this animated and interactive object, learners examine the inverse proportionality of wavelength and frequency and their relationship to the speed of light.

Real Gases

In this animated activity, learners compare the van der Waals equation with the Ideal Gas Law.

Calculating Formula Weight and Molecular Weight

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

Heat of Fusion and Heat of Vaporization

Learners examine graphs and read that the heat of fusion is the heat energy absorbed by one mole of solid as it is converted to liquid, while the heat of vaporization is the heat energy absorbed by one mole of liquid as it is converted to gas.

Atomic Symbols, Atomic Numbers, and Mass Numbers

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.

The Kinetic Theory of Gases

In this animated activity, learners examine what gases are composed of and how their particles interact. They also consider several assumptions that form the basis for the Kinetic Theory of Gases.

Gas Volume vs. Pressure (Boyle's Law)

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.

Oxidation Numbers

Learners assign oxidation numbers to atoms in neutral compounds and in polyatomic ions. Six examples are worked through in detail, and three problems are provided.

How Pressure Changes Boiling Temperature

By Terry Bartelt, Terry Fleischman

Learners study the effect that pressure has on boiling temperatures. Once a liquid has reached a full boil, additional heat does not raise the liquid’s temperature; however, pressure can vary the boiling point of a liquid. A brief quiz completes the activity.

Unit Conversions

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

The Combined Gas Law

Learners combine Boyle's Law and Charles's Law to solve for the pressure, volume, and temperature of a gas sample under two sets of conditions.

Calculating Gas Density from Standard Molar Volume

By Dr. Miriam Douglass

Learners calculate gas density from the standard molar volume and observe how the density increases with the increasing molecular weight of the gas.

Ideal Gas Law

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

Shapes of Simple Molecules - Part 1

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.

Shapes of Simple Molecules - Part 2

Learners examine how five or six groups of electrons around a central atom cause the shape of the molecule to be trigonal bipyramidal, seesaw, T-shaped, linear, octahedral, square pyramidal, or square planar. Seven examples and three interactive questions are provided in this animated activity.

Atomic Weight

Learners read the definition of atomic weight and obtain the weights of elements by viewing the Periodic Table and charts that list atomic weights by name or symbol.

Melting Point and Freezing Point

Learners observe that the melting of a solid and the freezing of its liquid occur at the same temperature. The melting point is an intrinsic property and is used to identify a substance.

Measuring Gas Pressure

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

Intermolecular Forces

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.

The Solid State

In this well-illustrated object, learners examine the structures and properties of the four types of solids: molecular, metallic, ionic, and covalent network. Five interactive questions are provided.

Identifying Compounds and Ions

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

Double Replacement Reactions

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

Isotopes

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