16CHM11509 HIK

16CHM11509 HIK - CHM 115 Dr. Chitta Das Lecture 16 Reading...

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CHM 115 Dr. Chitta Das Lecture 16 Reading was: 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 Lecture 17: 14.4 Next lab: Concentration and Spectroscopy
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Scientific American, June 19, 2000
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Hanging onto glass, the gecko’s party piece.
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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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Intermolecular Forces Model Basis of Attraction kJ/mol Example
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Question # 1 Which of the following atoms is the most electronegative?: A) sulfur B) tin C) oxygen D) nitrogen
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Electronegativity Relative ability of a bonded atom to attract shared electrons. Max. set to 4.0 for F
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Question # 2 Match strongest interparticle force with the substance Materials Intermolecular forces A) CH 3 OH Dispersion (London), B) CCl 4 dipole-dipole, C) Cl 2 hydrogen bonds, ion-induced dipole, or ion-dipole
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9 Electronegativity Differences The difference in EN ( EN) between the two atoms in a bond will tell you is a guide to what type of bond it is but there is no cutoff. Bonding character occurs along a continuum: mostly ionic, polar covalent mostly covalent
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Electronegativity Differences BF 3 , EN = 2.0 SiF 4 , EN = 2.2 LaH 3 , EN = 1.0 LiI, EN = 1.4 N 2 , EN = 0.0 EN CO 2 , EN = 1.0 CH 4 , EN = 0.4 NaCl, EN = 2.1 CaF 2 , EN = 3.0 Covalent Ionic
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Polar Bond Uneven distribution of electrons between atoms in a bond: F
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16CHM11509 HIK - CHM 115 Dr. Chitta Das Lecture 16 Reading...

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