Dr. Martin McClinton
In this screencast, we review the positions of metals, metalloids, and nonmetals in the Periodic Table and the general characteristics of each.
Changes in Our World: Chemical and Physical (Screencast)
By Deb Simonson
In this screencast, learners examine the kinds of physical and chemical changes that occur in substances.
Determining Empirical and Molecular Formulas
By Debbie McClinton, Dr. Miriam Douglass, Dr. Martin McClinton
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.
By Jill Larson
In this interactive object, the learner practices identifying charges on ions.
Biosecurity: Finding Sources of Disease Transmission Risk
By the end of this module, you’ll be able to:
- List four categories of disease agent sources
- Discover conditions when disease transmission is likely to occur
- Describe the means of disease transmission in a given situation
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