7.3 - Intermolecular Forces The static cling that attracts...

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1 Inter molecular force Weak ~0-40 kJ/mol Intra molecular force Covalent bond Strong ~400 kJ/mol Intermolecular Forces: The static cling that attracts one object to another Section 7.3 What is the nature of the intermolecular molecular force holding one molecular to another molecule? Section 7.3 Coulombic force of attraction between oppositely charged entities. dipole Partial positive charge ( +) & partial negative charge ( -) resulting from an asymmetric distribution of valence e - s. + - dipole + - temporary permanent dispersion forces dipole forces hydrogen bonding Section 7.3 + Dispersion Forces (induced) (induced) + + non-polar molecule Section 7.3 Dispersion Forces Dispersion generally are the weakest intermolecular force. However, they are important in molecules with large electron clouds. Therefore, dispersion forces typically increase with molecular size (mass). + (induced) (induced) + + Section 7.3 Dispersion Forces + (induced) (induced) + + F - F Cl - Cl Br - Br I - I Gases @ 1 atm/25 o C Liquid @ 1 atm/25 o C Solid @ 1 atm/25 o C Section 7.3
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2 H - Cl 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.)
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This note was uploaded on 03/30/2010 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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7.3 - Intermolecular Forces The static cling that attracts...

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