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3.3 Polar Bonds, and Polar Molecules

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Presentation on theme: "3.3 Polar Bonds, and Polar Molecules"— Presentation transcript:

1 3.3 Polar Bonds, and Polar Molecules

2 Recall... Electronegativity: a measure of the tendency of an atom to attract a bonding pair of electrons Electronegativity difference is an indicator of a bonds polarity ∆EN is a factor in determining molecule polarity

3 Bonding Continum Above 1.7 the bond is considered to be polar

4 Polar and Nonpolar Molecules
Just because a polar bond is present in a molecule does not mean the overall polarity of the molecule will be polar. Overall molecular shape contributes to a molecules overall polartiy. In order to assess polarity, sketching the Lewis structual diagram and determining electronegativity differences in useful.

5 Nonpolar Molecule generally symmetrical molecules
- another molecule is not able to “see” the positive part of the dipole because the negative ends are cancelling it out

6 Determine the Polarity of Cl2

7 Determine the Polarity of H2O

8 Work Pg. 108 # 1-6

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