q2t.key - Dr. Zellmer Time: 30 mins Chemistry 125 Winter...

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Dr. Zellmer Chemistry 125 Tuesday Time: 30 mins Winter Quarter 2012 February 14, 2012 Quiz II Name KEY Rec. TA/time 1. (5 pts) Which of the following aqueous solutions has the LOWEST freezing point ? Assume “ideal” ionic solutions are formed (i.e. no ion-pairing). Show work or explain your answers. K f = 1.86°C/ m . ) T f = i K f m = K f m particles m particles = i m stated for an “ideal” ionic solution, i = # ions from formula for the compound Don’t need to actually calculate ) T f and T f,soln to answer the question. You only need to calculate the molality of particles. Which ever solution has the greatest m part will have the lowest freezing point (biggest ) T f ). 0.012 m aqueous Al(ClO 3 ) 3 m part = 4 (0.012 m ) = 0.048 LOWEST f.p. H 2 O Al(ClO 3 ) 3 (s) --------> Al 3+ + 3 ClO 3 - i = 4 ions (ClO 3 - stays together as a single particle in soln) 0.015 m aqueous CuCl 2 m part = 3 (0.015 m ) = 0.045 H 2 O CuCl 2 (s) --------> Cu 2+ + 2 Cl - i = 3 ions 0.020 m aqueous FeSO 4 m part = 2 (0.020 m ) = 0.040 H 2 O FeSO 4 (s) --------> Fe 2+ + SO 4 2- i = 2 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 + 4 B v C + 3 D Experiment [A] (M) [B] (M) Initial rate (M/s) 1 0.100 0.100 0.1000 2 0.050 0.100 0.0125 3 0.300 0.100 2.7000 4 0.300 0.200 7.6368 5 0.100 0.200 0.2828 a) What is the rate law for the reaction? **** Continued on next page **** Copyright R. J. Zellmer, February 14, 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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q2t.key - Dr. Zellmer Time: 30 mins Chemistry 125 Winter...

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