college chemistry ii phs 1035 spring 2013 practice exam 2 -...

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Chapter 17 / Exercise 8
Medium/Heavy Duty Truck Engines, Fuel & Computerized Management Systems
Bennett
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College Chemistry II PHS 1035 Spring 2013 Practice Exam 2 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is takes for it to decrease to 0.085 M. it 1) _______ A) 7.0 B) 8.0 C) 11 D) 10.
E) 12 A flask is charged with 0.124 mol of Aand allowed to react to form Baccording to the reaction A(g) B(g).The following data are obtained for [A]as the reaction proceeds: 2) How many moles of B are present at 30 s? 2) _______
E) 0.15 3) The average rate of disappearance of A between 10 s and 20 s is __________ mol/s. 3) _______
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4) How many moles of B are present at 10 s? 4) _______
E) 0.011 5) The average rate of appearance of B between 20 s and 30 s is __________ mol/s. 5) _______ A) +7.3 ×10-B) +5.0 ×10-C) +1.5 ×10-D) -7.3 ×10-E) -1.5 ×10-
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3 6) The average rate of disappearance of A between 20 s and 40 s is __________ mol/s. 6) _______
8.5 ×10-4 7) The average rate disappearance of A between 20 s and 30 s is __________ mol/s. 7) _______
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The peroxydisulfate ion() reacts with the iodide ion in aqueous solution via the reaction: (aq) +3I-2(aq) +I3-(aq) An aqueous solution containing 0.050 M ofion and0.072 M ofI-is prepared, and the progress of the reaction followed by
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Medium/Heavy Duty Truck Engines, Fuel & Computerized Management Systems
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Chapter 17 / Exercise 8
Medium/Heavy Duty Truck Engines, Fuel & Computerized Management Systems
Bennett
Expert Verified
measuring[I-]. The data obtained is given in the table below.8) The average rate of disappearance of I-in the initial 400.0 s is __________ M/s. 8) _______
×10-49) The average rate of disappearance of I-between 400.0 s and 800.0 s is __________ M/s. 9) _______ A) 3.6 ×104 B) 5.8 ×10-5 C) 1.4 ×10-5 D) 2.8 ×10-5 E)
2.6 ×10-4 10) The concentration of S2O82-remaining at 1600 s is __________ M. 10) ______
E) 0.064 11) The average rate of disappearance of I-between 1200.0 s and 1600.0 s is __________ M/s. 11) ______
×10-512) The concentration of S2O82-remaining at 800 s is __________ M. 12) ______
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13) The concentration of S2O82-remaining at 400 s is __________ M. 13) ______ A) +0.045 B) +0.035 C) +0.057 D) +0.015 E)
-0.007 14) A rock contains 0.222 mg of lead-206 for each milligram of uranium-238. The for the decay of uranium-238 to lead-206 is 4.5 ×yr. The rock was formed __________ yr ago. 14) ______
×10815) The following reaction occurs in aqueous solution: NH4+(aq) +NO2-N2 (g) +2O (l) The data below is obtained at 25°C. The order of the reaction in NH4+is __________. 15) ______
E) -2

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