Q2r.key - Dr Zellmer Time 30 mins Chemistry 125 Winter Quarter 2012 Quiz II Name 1 KEY Thursday Rec TA/time(5 pts Which of the following aqueous

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Dr. Zellmer Chemistry 125 Thursday Time: 30 mins Winter Quarter 2012 February 16, 2012 Quiz II Name KEY Rec. TA/time 1. (5 pts) Which of the following aqueous solutions has the HIGHEST osmotic pressure at 50.0°C? Assume “ideal” ionic solutions are formed (i.e. no ion-pairing). Show work or explain your answers. A = i MRT = (M particles )RT M particles = i M stated for an “ideal” ionic solution, i = # ions from formula for the compound Don’t need to actually calculate A to answer the question. You only need to calculate the molarity of particles since they are all at the same temp. Which ever solution has the greatest M part will have the highest osmotic pressure . 0.020 M aqueous Fe(NO 3 ) 3 M part = 4 (0.020 M) = 0.080 HIGHEST A H 2 O Fe(NO 3 ) 3 (s) --------> Fe 3+ + 3 NO 3 - i = 4 ions (NO 3 - stays together as a single particle in soln) 0.025 M aqueous CaCl 2 M part = 3 (0.025 M) = 0.075 H 2 O CaCl 2 (s) --------> Ca 2+ + 2 Cl - i = 3 ions 0.015 M aqueous Al 2 (SO 4 ) 3 M part = 5 (0.015 M) = 0.075 H 2 O Al 2 (SO 4 ) 3 (s) --------> 2 Al 3+ + 3 SO 4 2- i = 5 ions (SO 4 2- stays together as a single particle in soln) 2. (7 pts) The following data were measure for the reaction 2 A + 3 B v C + 4 D Experiment [A] (M) [B] (M) Initial rate (M/s) 1 0.100 0.050 0.0500 2 0.100 0.100 0.2000 3 0.100 0.300 1.8000 4 0.200 0.300 5.0912 5 0.200 0.100 0.5657 a) What is the rate law for the reaction? **** Continued on next page **** Copyright R. J. Zellmer, February 16, 2012
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2. (Cont.) a) What is the rate law for the reaction? NOTE: In step 2 above I purposely used two exp. such that both substances changed conc. to show that
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This note was uploaded on 02/19/2012 for the course CHEM 125 taught by Professor Zellmer during the Winter '08 term at Ohio State.

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Q2r.key - Dr Zellmer Time 30 mins Chemistry 125 Winter Quarter 2012 Quiz II Name 1 KEY Thursday Rec TA/time(5 pts Which of the following aqueous

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