Spring 2007 EXAM 2B

Spring 2007 EXAM 2B - Exam2 Name_Section_

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Exam 2 Name___________________________________ Section __________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Given the data in the table below, Δ rxn for the reaction 4NH 3 (g) + 5O 2 (g) 4NO (g) + 6H 2 O (l) is __________ kJ. Substance Δ H f ° (kJ/mol) H 2 O (l) - 286 NO (g) 90 NO 2 (g) 34 HNO 3 (aq) - 207 NH 3 (g) - 46 A) - 1892 B) - 1172 C) - 1540 D) - 150 E) The Δ H f ° of O 2 (g) is needed for the calculation. 1) 2) A weak electrolyte exists predominantly as __________ in solution. A) ions B) an isotope C) atoms D) molecules E) electrons 2) 3) Given the following reactions N 2 (g) + 2O 2 (g) 2NO 2 (g) Δ H = 66.4 kJ 2NO (g) + O 2 (g) 2NO 2 (g) Δ H = - 114.2 kJ the enthalpy of the reaction of the nitrogen to produce nitric oxide N 2 (g) + O 2 (g) 2NO (g) is __________ kJ. A) 47.8 B) - 180.6 C) - 47.8 D) 180.6 E) 90.3 3) B 1
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4) Which of the following is an oxidation - reduction reaction? A) HCl (aq) + NaOH (aq) H 2 O (l) + NaCl (aq) B) Cu (s) + 2AgNO 3 (aq) 2Ag (s) + Cu(NO 3 ) 2 (aq) C) Ba(C 2 H 3 O 2 ) 2 (aq) + Na 2 SO 4 (aq) BaSO 4 (s) + 2NaC 2 H 3 O 2 (aq) D) AgNO 3 (aq) + HCl (aq) AgCl (s) + HNO 3 (aq) E) H 2 CO 3 (aq) + Ca(NO 3 ) 2 (aq) 2HNO 3 (aq) + CaCO 3 (s) 4) 5) A __________ Δ H corresponds to an __________ process. A) positive, exothermic B) zero, endothermic C) positive, endothermic D) negative, endothermic E) zero, exothermic 5) 6) What volume (mL) of a concentrated solution of sodium hydroxide (6.00 M) must be diluted to 200 mL to make a 0.88 M solution of sodium hydroxide?
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Spring 2007 EXAM 2B - Exam2 Name_Section_

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