WA09_CHE-121-mar14 - Thomas Edison State College General...

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Thomas Edison State College General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: May Term Written Assignment 9: Chemical Bonding Answer all assigned questions and problems, and show all work. 1. Use the second member of each group from Group IA to Group 7A to show that the number of valence electrons on an atom of the element is the same as its group number. (8 points) The second member of group 1A is Li, which has one valence electron; the second member of group 7A is Cl, which has seven valence electrons. (Reference: Chang 9.2) 2. Explain the following: (3 points) a. ionic bond: the electrostatic force that chemically links two oppositely-charged ions. b. nonpolar covalent bond: a bond between atoms where electrons are shared. c. polar covalent bond: a bond between atoms where electrons that have different charges unevenly share electrons. 3. Specify which compound in the following pairs of ionic compounds has the higher lattice energy: Explain your choice. (6 points) a. KCl or MgO : MgO as each ion is +2. b. LiF or LiBr : LiBr as LiBr is larger than LiF. c. Mg 3 N 2 or NaCl : NaCl as Mg 3 N 2 is composed of three neural atoms.
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  • Spring '15
  • Khurana
  • Chemistry, Chemical bond, Edison State College

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