Lec-23-Chap-09-4 - Types of Intermolecular Forces CHE 131...

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CHE 131 Lecture 23 – Hydrogen Bonds, Biomolecules, Chirality Chapter 9: pp. 413-424. Types of Intermolecular Forces Intermolecular Forces in Methane London Forces
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Fig. 9-17, p.407 Boiling Points of Nonpolar Substances Shape of molecules can play a role in magnitude of dispersion forces. Overall attraction between molecules Is greater because molecules can come into contact with each other. Dipole- Dipole Attractions Idea of polarizability: “squishiness” of the electron cloud.
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Nonpolar and Polar Substances Hydrogen Bonds • Attraction of hydrogen atom for an electron pair on a small, very electronegative atom • Examples include an H-F, H-O, or H-N bond. Hydrogen bonds are stronger than dispersion forces. • Bond between hydrogen and any of three elements is quite polar, with hydrogen at the positive end. • Energies of bonds: 4-25 kJ/mol . p.413a
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Lec-23-Chap-09-4 - Types of Intermolecular Forces CHE 131...

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