imfa+and+liquids - Principles of General Chemistry, 2nd ed....

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1 Intermolecular Forces of Attraction Principles of General Chemistry, 2 nd ed. By M. Silberberg Chemistry, 8th ed. by W. Whitten, R. Davis, R., M. L. Peck, and G. Stanley. Chemistry 8ed, Whitten etal, TB/C 2007 Forces of Attraction or Attractive Forces - are electrostatic in nature a. Intra molecular forces - are forces that exist within within each molecule - influence the chemical chemical properties of the substance b. Inter molecular forces - are forces that exist between molecules - influence the physical properties of the substance Forces of Attraction or Attractive Forces Forces of Attraction or Attractive Forces 5 Ion - ion interactions The force of attraction between two oppositely charged ions is governed by Coulomb’s law. Intermolecular Forces of Attraction (IMFAs) 6 Coulomb’s law determines: The melting and boiling points of ionic compounds. The solubility of ionic compounds. Example: Arrange the following ionic compounds in the expected order of increasing melting and boiling points. NaF, CaO, CaF 2 Intermolecular Forces of Attraction (IMFAs)
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2 7 - 2 + 2 2 + 2 + O Ca F Ca F Na < < - - Answer: Ionic substances containing multiply charged ions, (eg Al 3+ , Mg 2+ , O 2- , S 2- ) usually have higher melting/boiling points than singly charged ions For a series of ions of similar charge, the closer approach of smaller ions results in stronger interionic attractions and consequently higher melting/boiling properties Intermolecular Forces of Attraction (IMFAs) s table of melting points Melting Points of Some Ionic Compounds Compound Mp ( o C) Compound Mp ( o C) Compound Mp ( o C) NaF 993 CaF 2 1423 MgO 2800 NaCl 801 Na 2 S 1180 CaO 2580 NaBr 747 K 2 S 840 BaO 1923 Intermolecular Forces of
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This note was uploaded on 07/24/2011 for the course CHEM 16 taught by Professor Siao during the Spring '07 term at University of the Philippines Diliman.

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imfa+and+liquids - Principles of General Chemistry, 2nd ed....

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