By Terri Langan
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In this animated object, learners examine the kinds of physical and chemical changes that occur in substances. They practice identifying examples of each.
Students are introduced to the non-inverting amplifier configuration. The formulas for closed loop gain and bandwidth are shown, and an example is given.
Learners read about nonverbal communication. In a drag-and-drop exercise, they evaluate photos of people interacting and determine if the behaviors shown interfere with communication or enhance it.