WA05_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 2015 Written Assignment 5: Chemical Reactions in Solution Answer all assigned questions and problems, and show all work. 1. Define electrolyte and nonelectrolyte and identify each of the following substances as a strong electrolyte, weak electrolyte, or nonelectrolyte: (5 points) An electrolyte is a substance that produces ions when dissolved in water. A non-electrolyte does not produce ions when dissolved in water. a. H 2 O-nonelectrolyte b. KCl-strong electrolyte (ionic compound) c. HNO 3 -strong electrolyte (strong acid) d. CH 3 COOH-electrolyte e. C 12 H 22 O 11 -nonelectrolyte (Reference: Chang 4.9) 2. Write ionic and net ionic equations for the following reactions: (8 points) a. AgNO 3 + Na 2 SO 4 AgNO 3 (aq) + Na 2 SO 4 (aq) Ag 2 SO 4 (aq) + 2NaNO 3 (aq) 2AgNO 3 (aq) + Na 2 SO 4 (aq) Ag 2 SO 4 (aq) + 2NaNO 3 (aq) 2Ag +1 (aq) + NO 3 -1 (aq) + 2Na +1 (aq) + SO 4 -2 (aq) 2Ag +1 (aq) + SO 4 -2 (aq) + 2Na +1 (aq) + 2NO 3 -1 (aq) b. BaCl 2 + ZnSO 4 Ba 2+ (aq) + SO 4 2- (aq) BaSO 4 (s) Ba 2+ (aq) + 2 Cl - (aq) + Zn 2+ (aq) + SO 4 2- (aq) BaSO 4 (s) + Zn 2+ (aq) + 2 Cl - (aq) c. (NH 4 ) 2 CO 3 + CaCl 2 Ca 2+ (aq) + CO 3 2- (aq) CaCO 3 (s) 1 Copyright © 2014 by Thomas Edison State College. All rights reserved.
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2NH 4 1+ (aq) + CO 3 2- (aq) + Ca 2+ (aq) + 2Cl 1- (aq) 2NH 4 1+ (aq) + 2Cl 1- (aq) + CaCO 3 (s) d. NaNO 3 + KCl NaNO 3 + KCl NaCl + KNO 3 Na + + NO 3- + K + + Cl - K + + NO 3- + Na + + Cl - The ionic net equation cancels out because both are soluble in water (Reference: Chang 4.21) 3. With reference to Table 4.2, suggest one method by which you might separate (a) K + from Ag + , (b) Ba 2+ from Pb 2+ , (c) NH 4 + from Ca 2+ , and (d) Ba 2+ from Cu 2+ . All cations are assumed to be in aqueous solution, and the common anion is the nitrate ion. (8 points) a) add NaCl causing AgCl(s) to form b) add NaF causing PbF(s) to form c) add NaOH causing CaOH(s) to form d) add NaF causing BaF(s) to form (Reference: Chang 4.24) 4. Give the oxidation number of the underlined atoms in the following molecules and ions: (7 points) a. Cl F = 1+ b. I F 7 = 7+ c. C H 4 = 4- d. C 2 H 2 = 1- e. C 2 H 4 = 2- f. K 2 Cr O 4 = 6+ g. K 2 Cr 2 O 7 = 6+ h. KMn O 4 = 7+ i. NaHC O 3 = 4+ j. O 2 = - k. NaI O 3 = 5+ l. K 2 O = -1/2 m. P F 6 = 6+ n. Au Cl 4 = 3+ (Reference: Chang 4.47) 2 Copyright © 2014 by Thomas Edison State College. All rights reserved.
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  • Spring '15
  • Khurana
  • Chemistry, Mole, Sodium, Chemical reaction, Sodium chloride

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