Dr. Miriam Douglass
Dr. Martin McClinton
Learners examine a table of common polyatomic ions. Eight examples are provided for practice.
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.
Energy in Chemical Reactions
By Dr. Miriam Douglass
In this animated and interactive object, learners examine kinetic and potential energy as well as the first law of thermodynamics and the flow of energy between a system and its surroundings. Students also answer questions about exothermic and endothermic reactions
Conversion Between Mass and Moles of an Element (Screencast)
By Dr. Miriam Douglass, Dr. Martin McClinton
Atomic weights are used to convert the mass of a sample into the number of moles of the element in the sample and vice versa. Four examples are provided for practice.
By Eileen Bouchard
Students read brief descriptions of atoms, molecules, elements, and compounds, and complete a matching exercise that pictures these particles and molecules as pieces of taffy.
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