Student notes lec - CHM 115 M01 and M02/19/07 Reading Sections 9.8(part pp Section 13.2-13.4 Section 5.8 Section14.1-14.2 408-412 pp 591-606 pp

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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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This note was uploaded on 01/20/2009 for the course CHM 115 taught by Professor Towns during the Fall '08 term at Purdue University-West Lafayette.

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Student notes lec - CHM 115 M01 and M02/19/07 Reading Sections 9.8(part pp Section 13.2-13.4 Section 5.8 Section14.1-14.2 408-412 pp 591-606 pp

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