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CH 101 notes 10-5

CH 101 notes 10-5 - Dipole forces exist between polar...

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H - Cl δ+ δ− Dipole forces exist between polar substances •Perm.dipolar forces •dispersion forces H - Cl vs F-F •dispersion forces BP: 188 K BP: 85 K 2 requirements to be a polar substance •EN difference between bonded atoms •the right shape Section 7.3 1) Draw the Lewis structure & determine shape. (Ex. SO 2 ) How to determine if a molecule has a permanent dipole ( i.e., how to determine if a molecule is polar.) S O O One resonance structure Shape: bent, 120° bond angle Section 7.3 S O O 2) Show the bond dipole for the electron bonding regions. Remember: the less EN atom has the “+” end of the bond dipole arrow. Bond dipoles Bond dipoles 3) Now imagine that the more EN atoms pull. Will the central atom move? If atoms move in the scenario, then the molecule has a permanent dipole. Section 7.3 Polar molecule 1) Draw the Lewis structure & determine shape. (Ex. CO 2 ) How to determine if a molecule has a permanent dipole ( i.e., how to determine if a molecule is polar.) Shape: linear, 180° bond angle O C O Section 7.3 C O O 3) Now imagine that the more EN atoms pull. Will the central atom move?
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