oCT 4 - Mon, 4 Oct 10 Announcements Lecture 2 Partial ionic...

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1 Mon, 4 Oct 10 • Announcements • Lecture 2 – Partial ionic character of covalent bonds (13.6) – The covalent chemical bond: a model (13.7) – Covalent bond energies and chemical reactions (13.8) Ionic vs. Polar Covalent Ionic bonds occur between two atoms with very different ENs. Polar covalent bonds also occur between atoms with different ENs. In reality, total ionic bonding is probably never achieved, and all “ionic” bonds can be considered to be polar covalent, with varying degrees of ionic character . So where is the dividing line between “ionic” bonding and “polar covalent” bonding?
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2 Ionic Character We can define the ionic character of bonds as follows: % Ionic Character = x 100% (dipole moment X-Y) experimental (dipole moment X + Y - ) calculated The dipole moment ( μ ) is defined as: μ = QR The units of dipole moment are generally the Debye (D), a “Coulomb” (C) of charge acting over a distance (m): 1 D = 3.336 x 10 -30 C.m Ionic Character (cont.) • The experimentally-determined dipole moment of HF is 1.83 D. What is the ionic character of the H-F bond? (bond length = 92 pm)
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This note was uploaded on 10/26/2010 for the course CHEM 152 taught by Professor Chiu during the Fall '08 term at University of Washington.

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oCT 4 - Mon, 4 Oct 10 Announcements Lecture 2 Partial ionic...

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