Ch 12 Quiz Rate Laws 2011 PDF

Ch 12 Quiz Rate Laws Name ________________________________________ Date ___________________ Period __________ 1. Consider the following reaction between nitrogen dioxide and carbon monoxide: NO2(g) + CO (g)  NO(g) + CO2(g) The initial rate of the reaction...

Ch 12 Quiz Rate Laws Name ________________________________________ Date ___________________ Period __________ 1. Consider the following reaction between nitrogen dioxide and carbon monoxide: NO2(g) + CO (g)  NO(g) + CO2(g) The initial rate of the reaction was measured at several different concentrations of the reactants with the following results: [NO2] (M) [CO] (M) Initial Rate (M/s) 0.10 0.10 0.0021 0.20 0.10 0.0082 0.20 0.20 0.0083 0.40 0.10 0.033 From the data, determine each of the following: (10 points) a) order of the reaction with respect to each reactant b) the rate law for the reaction c) the rate constant (k) for the reaction Ch 12 Quiz Rate Laws 2. The rate of the reaction A + B  C + D depends only on the concentration of A below 225C. At a temperature below 225C the following data were collected. Identify the rate law, integrated rate law, rate constant, and the concentration of A at 28000 seconds. (10 points) 0 -0.2 0 5000 10000 15000 20000 time (s) [A] (M) 0.600 -0.4 0 0.500 0.500 -0.6 -0.8 1200 0.444 ln[A] 0.400 -1 -1.2 3000 0.381 0.300 [A] -1.4 4500 0.340 0.200 -1.6 -1.8 0.100 9000 0.250 f(x) = -0.0000172x + 0.4505445 -2f(x)= -0.0000578x - 0.7699844 R² 0.000 = 0.9011586 R² = 0.9706857 18000 0.174 0 5000 10000 15000 20000 time time 7 6 5 4 1/[A] 3 2 1 f(x) = 0.000210x + 2.012452 0 R² = 0.998736 0 5000 10000 15000 20000 time 3. A first order reaction has a rate constant of 3.15x10-3 s-1. What is the half life of this reaction? If the initial concentration is 1.0 M, what is the concentration after 11 minutes? (5 points)