WA05_CHE-121-mar14 - Thomas Edison State College General Chemistry I with Labs(CHE-121 Section no OL009 Semester and year May 2015 Written Assignment 5

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.H2O-nonelectrolyteb.KCl-strong electrolyte (ionic compound)c.HNO3-strong electrolyte (strong acid)d.CH3COOH-electrolytee.C12H22O11-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)Ba2+from Pb2+, (c)NH4+from Ca2+, and (d)Ba2+from Cu2+. All cationsare assumed to be in aqueous solution, and the common anion is the nitrate ion. (8 points) (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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