Chem 161-2010 Chapter 11-some problems

Chem 161-2010 Chapter 11-some problems - CHEM 161-2007...

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CHEM 161-2007 CHAPTER 11 – STATES OF MATTER AND INTERMOLECULAR FORCES PRACTICE PROBLEMS DR. ED TAVSS Intermolecular forces (e.g., H-bonding) Structures and types of solids (e.g., crystal structures) Phase changes and diagrams 1
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INTERMOLECULAR FORCES (e.g., H-BONDING) 44 Chem 161-2006 Final Exam Hill & Petrucci Chapter 11 – States of Matter and Intermolecular Forces Intermolecular forces (dipole-dipole, London, etc.) Arrange the following from lowest boiling point to highest boiling point. 1. Cl 2 2. KCl 3. CCl 4 4. BCl 3 5. CaCl 2 A. 1<2<3<4<5 B. 4<3<1<5<2 C . 1<4<3<2<5 D. 1<3<4<2<5 E. 5<2<3<4<1 . . . . : Cl ― Cl : London dispersion forces; smaller than . . . . BCl 3 and CCl 4 due to smallest surface area. . . K :Cl: Electrostatic interaction; smaller than MgCl 2 . . due to Coulomb’s law. . . :Cl: . . | . . :Cl―C―Cl : London dispersion forces; stronger than BCl 3 and . . | . . Cl 2 , due to greatest surface area. :Cl: . . . . : Cl : . . | . . London dispersion forces; stronger : Cl ― B ― Cl : than Cl 2 , but weaker than CCl 4 , due . . . . to middle surface area. . . . . :Cl: Mg :Cl: Electrostatic interaction; stronger than . . . . KCl due to Coulomb’s law. 1 < 4 < 3 < 2 < 5 C 2
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9 Chem 161-2006 Final Exam Hill & Petrucci Chapter 11 – States of Matter and Intermolecular Forces Intermolecular forces (dipole-dipole, London, etc.) Which one of the following compounds can hydrogen bond with itself? A. CH 3 CH 2 OCH 2 CH 3 B. (CH 3 CH 2 ) 3 N C. CH 3 CH 2 CH 2 CH 2 CH 3 D . CH 3 CH 2 CH 2 CH 2 OH E. CH 3 CH 2 CH 2 SH CH 3 CH 2 CH 2 CH 2 OH Hydrogen bonding requires Y = N, O or F Y ― H Y A. The hydrogens are bonded to carbons, not N, O or F. B. The hydrogens are bonded to carbons, not N, O or F. C. The hydrogens are bonded to carbons, not N, O or F. D. CH 3 CH 2 CH 2 CH 2 O—H CH 3 CH 2 CH 2 CH 2 O—H CH 3 CH 2 CH 2 CH 2 OH A hydrogen is covalently bonded to an oxygen within a given molecule, and hydrogen bonded to an oxygen of another molecule. E. The hydrogen is bonded to sulfur, not N, O or F. D 3
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8 Chem 161-2005 Final exam CHAPTER 10: LIQUIDS AND SOLIDS Intermolecular forces (dipole-dipole, London, etc.) Which one of the following statements is correct? A. London Dispersion forces arise from the attraction of oppositely charged ions. B. London Dispersion forces account for the high boiling point of water. C. London Dispersion forces are responsible for the hydration of cations in solution. D . London Dispersion forces result from the instantaneous dipole generated by the fluctuation of the electron cloud on the molecules. E. Compounds with greater molar masses have weaker London dispersion forces. A. False. Electrostatic forces arise from the attraction of oppositely charged ions. B. False. Dipole-dipole bonding, specifically hydrogen bonding, accounts for the high boiling point of water. London Dispersion forces contribute, but a very small amount. C. False. Ion-dipole forces are responsible for the hydration of cations in solution.
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