The Mole and Avogadro's Number
By Debbie McClinton, Dr. Miriam Douglass, Dr. Martin McClinton
Learners examine how chemists use moles to "count" atoms by weight. Examples are given.
Oxidation States of Ions
Learners examine the periodic table to identify metallic elements that have either fixed or variable oxidation states.
Double Replacement Reactions
By Jill Larson
In this interactive object, learners identify charges on ions, write new formulas based on charge, and balance equations using coefficients.
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.
Real Gases
By Dr. Miriam Douglass, Dr. Martin McClinton
In this animated activity, learners compare the van der Waals equation with the Ideal Gas Law.
Vapor Pressure
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.
Moles
In this animated object, students are introduced to moles as a measurement.
Absolute Zero Temperature
Learners view illustrations showing the direct dependence of the volume of a gas on temperature and consider the relationship between the Kelvin and Celsius temperature scales.
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.
Boiling Point of a Liquid
Learners examine how the boiling point increases with increasing pressure. An example from industry is given.