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Molecular Polarity

Molecular Polarity. Predicting and Understanding the Behavior of Molecules. PGCC CHM 101 Sinex. Molecular Polarity - How?. Lewis dot structure  geometry  bond polarity ( D EN) and lone pairs  how is the charge distribution – symmetrical or asymmetrical?

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Molecular Polarity

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  1. Molecular Polarity Predicting and Understanding the Behavior of Molecules PGCC CHM 101 Sinex

  2. Molecular Polarity - How? Lewis dot structure  geometry  bond polarity (DEN) and lone pairs  how is the charge distribution – symmetrical or asymmetrical? Electrostatic potential map using Chime N2 HCl Spartan 02 Chime activity - Click here

  3. Molecular Polarity - Why? Interactions with other molecules and physical properties such as boiling point, surface tension, and solubility Intramolecular interactions – within molecule such as proteins Reaction mechanisms – where attacked

  4. An experimental measurement The dipole moment, m, is given by • = Qd where Q is the charge and d is the separation distance of the charge The unit is the debye, D.

  5. Measurement: Dipole Moment No voltage applied on metal plates d- d+

  6. Measurement: Dipole Moment - + Voltage applied on metal plates d- d+

  7. Increasing polarity Dipole Moments

  8. Dichloromethane, CH2Cl2 mcalc = 1.50 D Spartan 02

  9. Ammonia, NH3 mcalc = 1.85 D Spartan 02

  10. A square planar complex - Pt(NH3)2Cl2 Polar or Non-polar Cl-Pt-N = 80o Cl-Pt-Cl = 101.4o polar Non-polar Spartan 02

  11. Polar or non-polar molecules? CCl2F2 HCN SCl4F2 ICl3 BCl3 BrCl

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