Percent Composition of Compounds (Screencast)
By Debbie McClinton, Dr. Miriam Douglass, Dr. Martin McClinton
Learners examine the method used to calculate the mass percent of an element in a compound. Three examples and one problem illustrate the method.
The Kinetic Theory of Gases
By Dr. Miriam Douglass, Dr. Martin McClinton
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.
The Limiting Reagent in Chemical Reactions
In this interactive object, learners determine the limiting reagent and the excess reagent in chemical reactions. Learners test their knowledge by solving three problems.
Calculating Formula Weight and Molecular Weight
In this interactive object, learners calculate formula and molecular weights by working through five examples and two problems.
Ion Charges
By Jill Larson
In this interactive object, the learner practices identifying charges on ions.
Shapes of Simple Molecules - Part 1 (Screencast)
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.
Blood Groups
By Barbara Liang
In this animated and interactive object, learners examine ABO blood antigens and Rh antigens and their compatibility.
Test Your Knowledge of Miscellaneous Bacteria
By Marise Hussey
Learners match diseases with their portals of entry, causative agents, and associated vectors.
The Structure of the Muscle Organ
In this animated object, learners examine the various connective tissue layers of the muscle organ. The terms "prime mover," "synergist," "antagonist," "origin," and "insertion" are defined.
"I Want to Be Well" Case 2: Bacterial Pathogens
By Dawn Madl
In this interactive object, learners review the case of a patient with meningococcal meningitis.
Common Types of Oxidation-Reduction Reactions (Screencast)
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.
Standard Molar Volume
By Dr. Miriam Douglass
Learners observe that the volume of one mole of any gas is 22.4 L at standard temperature and pressure. An illustration shows that only the mass of the molar volume differs with the identity of the gas.
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.
Chemical Bonds: The Hydrogen Bond
In this interactive object, students examine a type of chemical bond known as the "hydrogen bond."
"I Want to Be Well" Case 1: Respiratory Pathogens
In this learning activity you'll observe information and formulate an evaluation that includes diagnosis and microorganism identification.
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.
Etiologic Agents of Bacterial Diseases
In this interactive object, learners match the bacterial etiologic agent to the disease it causes.
Chemistry Math - Solving a Formula (Screencast)
By Laurel Maney
Students use algebra to rearrange formulas and solve for the missing volume, density, or mass quantity.
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.
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.
Endospores (Screencast)
By Kristine Snow
Learners read about endospores and view video clips demonstrating spore staining procedures. Correctly stained slides are shown.
Ions
Ions are electrically charged particles obtained from an atom or from a chemically bonded group of atoms by adding or removing electrons. Eight examples illustrate the number of protons, neutrons, and electrons in positive ions (cations) and in negative ions (anions).
Virus Matching Exercises
Learners complete two exercises. In the first quiz, they divide viruses into two categories: RNA and DNA. They later match each virus with the disease it causes.
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.
Viruses
By Jonathan Harris
In this animated learning object, students examine the life cycles of a virus.