Unit 3 Topic Outline.pdf - Unit 3 Intermolecular Forces and Properties(10 days 18-22 1 Intermolecular Forces a London dispersion forces i Weakest IMF ii

Unit 3 Topic Outline.pdf - Unit 3 Intermolecular Forces and...

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Unit 3: Intermolecular Forces and Properties (10 days, 18-22%) 1. Intermolecular Forces a. London dispersion forces i. Weakest IMF ii. Attractive interactions between nonpolar molecules experiencing temporary, fluctuating dipoles.
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iii. The larger the molecules the stronger the LDF due to additional ability for the molecule to elongate iv. These forces exist between all substances, but substances with only this weak molecular attraction exist as gasses at room temperature v. The stronger the IMF, the more energy is required to separate the molecules, thus the higher the boiling point. b. Dipole-induced dipole interactions i. Stronger than LDF ii. Attractive interaction between a polar and nonpolar molecule iii. In this case the polar molecule ‘induces’ the dipole in the nonpolar molecule iv. Strength based on the magnitude of the dipole on the polar molecule and the size of the nonpolar molecule
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c. Dipole-dipole interaction i. Stronger than dipole – induced dipole ii. Attractive interaction between two polar molecules iii. Strength depends on magnitude of dipole from both polar molecules iv. Interactions between polar molecules are greater than those between nonpolar of comparable size because these interactions act in addition to London dispersion forces
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d. Hydrogen bonding i. Basically a strong version of the dipole-dipole ii. Interaction when hydrogen atoms covalently bonded to N, O, and F are attracted to the negative end of a dipole formed by the electronegative atom (N, O, F) in a different molecule, or a different part of the same molecule
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e. Ion-dipole forces i. Strongest IMF ii.
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  • Fall '18
  • Kasner

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