Molecular Structure and Properties: Attractions between Molecules

Chapter 8 began with a lab designed to introduce students to the concept of polarity.  Students filled burets with water, vinegar, and vegetable oil and observed the path of the liquids in the absence or presence of an electrically charged wand.  The wand consisted of a long balloon rubbed vigorously on students’ hair to generate a static charge (build-up of electrons) on the balloon.  Students then observed how the negatively-charged balloon “pulled” the stream of water toward the balloon (pictured below along with the lab set-up).  Students worked through the Lesson 43 Worksheet while completing the lab.  After the lab, we reviewed the key vocabulary and concepts presented in the Lesson 43 PowerPoint.  For homework, students are assigned questions 4-6.

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