1. As always… OWL Lon-Capa assignments Lecture videos Textbook
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3. 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 M 1.8 x 10-5 Ms-1
0.020 M M 7.2 x 10-5 Ms-1
0.010 M 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

4. 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 M 1.8 x 10-5 Ms-1
0.020 M M 7.2 x 10-5 Ms-1
0.010 M M 3.6 x 10-5 Ms-1
a) 0.18
b) 18
c) 0.36
d) 36
e) I’m not sure

5. 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) b) c)
d) Not sure.
[A]
Time
1.00 M
0.500 M
10 sec
0.250 M
?? sec

6. Good to Know…

7. 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) x b) c) d) e)
Time (seconds)
[H2O2] (M)
1.11
30.0
0.732
60.0
0.483
90.0
0.319
120.0
0.210

8. 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

9. 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 = 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

10. 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