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Unit 8, Lesson 2 Polarity.

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Presentation on theme: "Unit 8, Lesson 2 Polarity."— Presentation transcript:

1 Unit 8, Lesson 2 Polarity

2 Dipoles and Polarity A dipole is a partial separation of charge that exists when one end of a molecule has a slight excess of positive charge and the other end has a slight excess of negative charge. A molecule that has a permanent dipole is said to be polar. A bond between two atoms with different electronegativities gives rise to a dipole.

3 Pick-a-Side: Polar or Nonpolar?
Ne H-H H-O O-Cl C-H 5 min

4 Symmetry and Polarity In addition to having permanent dipoles, a molecule must be asymmetrical in order to be polar. E.g. H2O and CH3Cl are asymmetrical and thus polar. BeF2 and BH3 are symmetrical and thus nonpolar. 10 min

5 Brain Break!

6 Demo: Luck or Science? (See Polarity Demo Handout and Answers) 20 min

7 Homework: Pg. 201 #10 5 min

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