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Polarity and Intermolecular Forces

Polarity and Intermolecular Forces. What is polarity (polar vs. nonpolar )? What are the three main types of IMFs ?. Bond Strength. Who’s the toughest? GREATEST STRENGTH Triple Bond Double Bond Single Bond LEAST STRENGTH. Triple Bond Single Bond. What is polarity?.

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Polarity and Intermolecular Forces

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  1. Polarity and Intermolecular Forces What is polarity (polar vs. nonpolar)? What are the three main types of IMFs?

  2. Bond Strength • Who’s the toughest? GREATEST STRENGTH • Triple Bond • Double Bond • Single Bond LEAST STRENGTH

  3. Triple Bond • Single Bond

  4. What is polarity? • molecule with two poles (+ and -) caused by unequal sharing of electrons

  5. Non-Polar Covalent • tug of war between shared e- and + nucleus • e- are shared equally • atoms in the bond pull equally • H2, O2, Diatomic atoms

  6. Polar Covalent • e- are shared UNEQUALLY in the bond • more electronegative element attracts more e- (-) while other element (+) • one end (+) and one end (-) • H2O, NH3

  7. Attractive Forces • TYPES OF ATTRACTIONS – NOT TRUE BONDS • Some molecules or parts of molecules are attracted to others and held together by forces of attraction but are not bonded.

  8. What is a dipole? • when an atom has two poles • positive + pole and negative - pole

  9. Intermolecular Forces • Are attractive forces • Not True Bonds!

  10. Dipole-Dipole • Dipole – Dipole: attraction between neighboring polar molecules

  11. Hydrogen Bond • H paired with only F, N, or O .. ONLY

  12. Dispersion • instant dipoles caused as e- move within energy levels • similar to a pile up on the electron super highway e- Pile Up

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