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IMF and Molecular Properties

IMF and Molecular Properties. Jan 12, 2012. Intermolecular Forces and Physical Properties. Virtual ChemBook , Elmhurst College. Solvents and Boiling Points. Boiling Point Trend: Mass. Intermolecular Forces. Hydrogen bonding Acceptor/donor Dipole/dipole Dipole/induced dipole

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IMF and Molecular Properties

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  1. IMF and Molecular Properties Jan 12, 2012

  2. Intermolecular Forces and Physical Properties • Virtual ChemBook, Elmhurst College

  3. Solvents and Boiling Points

  4. Boiling Point Trend: Mass

  5. Intermolecular Forces • Hydrogen bonding • Acceptor/donor • Dipole/dipole • Dipole/induced dipole • Induced dipole/induced dipole • Also called London dispersion forces VDWs Forces

  6. H-Bond Donor, Acceptor, Neither, or Both

  7. Polar Protic, Polar Aprotic, Nonpolar

  8. London Forces in Nonpolar Solvents

  9. General Principles • If molecules are about the same mass • H-bonding > Dipole-dipole > Induced dipole • Induced dipole is weakest interaction, but as surface area increases, cumulative effect can overcome stronger IMF • Strategy for predicting relative boiling points

  10. Solubility • “Like dissolves like” • Based on IMF

  11. Miscibility and Density • Miscibility spectrum • Density • Organics (0.7 g/mL) • Aqueous (1.0 g/mL) • Halogenated (1.3 g.mL)

  12. Miscibility with Water

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