Shapes of Simple Molecules - Part 1 (Screencast)
By Dr. Miriam Douglass, Dr. Martin McClinton
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.
Ion Charges
By Jill Larson
In this interactive object, the learner practices identifying charges on ions.
"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.
The Limiting Reagent in Chemical Reactions
By Debbie McClinton, Dr. Miriam Douglass, Dr. Martin McClinton
In this interactive object, learners determine the limiting reagent and the excess reagent in chemical reactions. Learners test their knowledge by solving three problems.
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.
Molarity
Students solve a molarity problem in a drag and drop exercise.
The Structure of the Muscle Organ
By Barbara Liang
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.
Percent Composition of Compounds (Screencast)
Learners examine the method used to calculate the mass percent of an element in a compound. Three examples and one problem illustrate the method.
Chemical Formulas
By Debbie McClinton, Dr. Martin McClinton
Students read an explanation of chemical formulas in this animated activity. A quiz completes the object.
Oxidation States of Ions
Learners examine the periodic table to identify metallic elements that have either fixed or variable oxidation states.
Electromagnetic Radiation (Screencast)
In this animated and interactive object, learners examine the inverse proportionality of wavelength and frequency and their relationship to the speed of light.
Calculating Formula Weight and Molecular Weight
In this interactive object, learners calculate formula and molecular weights by working through five examples and two problems.
Isotopes
The definition of an isotope is illustrated using the three isotopes of carbon. The three isotopes of hydrogen are discussed as exceptions.
The 3 Rs: Replacement, Reduction and Refinement
By BioLEAP
Practice how to make research decisions using the 3 Rs.
White Blood Cells
In this animated and interactive object, learners examine the structure and functions of granulocytes and agranulocytes. Two exercises complete the activity.
Gas Volume and Molar Amount
By Dr. Miriam Douglass
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.
Controlling pH
By Terry Bartelt
Learners view an animated presentation showing how the pH level of a cleaning solution is controlled in a closed-loop system in a manufacturing setting. A quiz completes the activity.
Determining Empirical and Molecular Formulas (Screencast)
Learners follow a four-step process to determine the empirical formula of a compound from the masses of its constituent elements. The molecular formula is determined in a fifth step using the molecular weight of the compound.
Cell-Based Models: Organoids and Organs-on-Chips
In this module, you will explore the many kinds of cell models and learn about the ways they differ from animal models.
Identifying Compounds and Ions
Learners complete an exercise to match chemical formulas with the names of binary compounds, tertiary compounds, and ions.
Mass Versus Weight
By Kim Ristow
In this learning activity you'll explore the difference between mass and weight.
Calculating Gas Density from Standard Molar Volume
Learners calculate gas density from the standard molar volume and observe how the density increases with the increasing molecular weight of the gas.
Dilution of Hydrochloric Acid
In this interactive object, learners examine how to properly dilute hydrochloric acid.
Product Yields in Chemical Reactions (Screencast)
Learners examine the meaning of theoretical yield, actual yield, and percent yield. They test their knowledge by solving two problems.
Solubility of Ionic Compounds in Water
Learners view movie clips to determine the solubility of two ionic compounds. They also examine a solubility chart and predict the solubility of compounds.