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Clicker Question For the hypothetical reaction A + 2B  3C, the following data were collected. The rate law for the reaction is: rate = (d[C]/dt) =   [A]0 [B]0 Initial Rate (d[C]/dt) 0.010 M 0.010 M 1.8 x 10-5 Ms-1 0.020 M 0.010 M 7.2 x 10-5 Ms-1 0.010 M 0.020 M 3.6 x 10-5 Ms-1 a) k[A]2[B] b) k[A]2[B]2 c) k[A][B] d) k[A][B]2 e) I’m not sure

Clicker Question For the hypothetical reaction A + 2B  3C, the following data were collected. Determine the value of the rate constant, k (units in seconds).   [A]0 [B]0 Initial Rate (d[C]/dt) 0.010 M 0.010 M 1.8 x 10-5 Ms-1 0.020 M 0.010 M 7.2 x 10-5 Ms-1 0.010 M 0.020 M 3.6 x 10-5 Ms-1 a) 0.18 b) 18 c) 0.36 d) 36 e) I’m not sure

Clicker Question [A] Time 1.00 M 0.500 M 10 sec 0.250 M ?? sec Determine the missing time given the following orders of reaction for aA  Products zero 1st 2nd a) 20 20 20 b) 30 20 15 c) 15 20 30 d) Not sure. [A] Time 1.00 M 0.500 M 10 sec 0.250 M ?? sec

Good to Know…

Clicker Question Recall the “elephant’s toothpaste” demonstration which involved the decomposition of a 30% hydrogen peroxide solution at 25°C. You are studying the same reaction at different conditions (at constant temperature): 2H2O2(aq)  2H2O(l) + O2(g). You record [H2O2] over time and obtain the following data: Determine the rate law constant for this reaction (using units of M and seconds). a) 7.50 x 10-3 b) 0.0126 c) 0.0139 d) 0.0322 e) 0.0505 Time (seconds) [H2O2] (M) 1.11 30.0 0.732 60.0 0.483 90.0 0.319 120.0 0.210

Clicker Question A first-order reaction is 42% complete at the end of 17 minutes. Determine the value of the rate constant. a) 3.2 x 10-2 min-1 b) 5.1 x 10-2 min-1 c) 1.8 min-1 d) 20. min-1 e) 31 min-1

Clicker Questions Pure N2O3 was placed in a rigid vessel and allowed to decompose: 2N2O3(g)  2N2(g) + 3O2(g). The following data were collected in an experiment at a certain temperature. Determine: the rate law of the reaction. the first half-life for the reaction the pressure of O2(g) at t = 25.00 minutes Time (min) Ptotal (atm) 10.000 10.00 15.071 20.00 18.428 30.00 20.649 40.00 22.120 50.00 23.094

Clicker Question (1/3) a) k b) k[N2O3] c) k[N2O3]2 d) k[N2O3]3 Pure N2O3 was placed in a rigid vessel and allowed to decompose: 2N2O3(g)  2N2(g) + 3O2(g). The following data were collected in an experiment at a certain temperature. Note that it is total pressure. Determine the rate law of the reaction. a) k b) k[N2O3] c) k[N2O3]2 d) k[N2O3]3 e) I’m not sure Time (min) Ptotal (atm) 10.000 10.00 15.071 20.00 18.428 30.00 20.649 40.00 22.120 50.00 23.094