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student notes lec 16 F07

student notes lec 16 F07 - CHM 115 M01 and M02/19/07...

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1 CHM 115 M01 and M02 Lecture 16, 10/19/07 Reading: Sections 9.8 (part), pp. 408-412; Section 13.2-13.4, pp. 591-606; Section 5.8, pp. 205-212; Section14.1-14.2, pp. 658-668
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2 Scientific American, June 19, 2000
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3 Hanging onto glass, the gecko’s party piece.
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4 Two million densely packed, fine hairs, or "setae", on each toe. The end of each seta is further subdivided into hundreds to thousands of structures called spatulae. The stickiness of the gecko is attributed to intermolecular forces. These forces come into play because the gecko foot hairs get so close to the surface. A billion spatulae to come into intimate contact with the surface, combining to create a strong adhesive force.
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5 Intermolecular Forces Model Basis of Attraction kJ/mol Example
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6 Electronegativity Relative ability of a bonded atom to attract shared electrons. Max. set to 4.0 for F
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7 Think/Pair/Share Match strongest interparticle force with the substance Materials Intermolecular forces A. Dispersion (London), B. dipole-dipole, C. hydrogen bonds, ion-induced dipole, or ion-dipole
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8 Electronegativity The difference in EN ( EN) between the two atoms in a bond will tell you what type of bond it is. Bonding character occurs along a continuum: mostly ionic, polar covalent, mostly covalent
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9 Polar Bond Uneven distribution of electrons between atoms in a bond: F
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10 Dipole Moment
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