Chem 1332
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- Words: 978
- Pages: 5
View Attempt
1 of 5
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
View Attempt 2 of unlimited Title:
Chapter 16(1)
Started:
September 27, 2009 5:56 PM
Submitted:
September 27, 2009 6:31 PM
Time spent:
00:34:59
Total score: 12/12 = 100% 1.
Total score adjusted by 0.0
Maximum possible score: 12
Average Rate 4 The compound AX2 decomposes according to the equation, 2 AX2(g) => 2 AX(g) + X2(g). In one experiment, [AX2] was measured at various times, and these data recorded: Time (s)
[AX2] mol/L
0
0.0500
2.0
0.0448
6.0
0.0300
8.0
0.0249
10.0
0.0209
20.0
0.0088
What is the average rate from 2.0 to 6.0 seconds in mol / L s? Use 3 significant figures. [don't include units in your answer; if you want to use scientific notation, use the E format. e.g., 0.0011 is 1.1E-3
Student Response 1. 3.7E-3
Score:
2.
Value
Correct Answer
100%
Equals 0.0037 (0%) Equals 3.7E-3 (100%) Contains .0037 (100%) Equals 3.70E-3 (100%)
1/1
Relative Rates of Substances 17 Consider the reaction, 2 D(g) + 3 E(g) + F(g) => 2 G(g) + H(g) When [H] is increasing at 0.47 mol/Ls, how quickly is [D] decreasing?
Student Response Answer .94 Score:
3.
Value
Correct Answer
100%
0.940
1/1
Rate Law General 6 What is the overall reaction order for Cl2 in a reaction with the following rate law? Rate = k[Cl2][H+]2[CO]2
27-Sep-09 6:31 PM
View Attempt
2 of 5
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Value Response 1. First
100%
2. Second
0%
3. Third
0%
4. Fourth
0%
5. Fifth
0%
Score:
4.
Correct Answer Feedback
1/1
Known Rate Law Change Conc 54 For the reaction, A(g) + B(g) => AB(g), the rate is 0.750 mol/L.s when the initial concentrations of both A and B are 2.00 mol/L. If the reaction is first order in A and first order in B, what is the rate when the initial concentration of A = 3.72 mol/L and that of B = 2.69 mol/L (give answers in E notation to 3 significant figures)
Student Response Answer 1.88 Score:
5.
Value
Correct Answer
100%
1.9
1/1
Known Rate Law, Change Conc 26 Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of BrO3- is doubled and that of Br- is tripled? Just put in the number as a whole number or fraction.
Student Response 1. 6
Score:
6.
Value
Correct Answer
100%
Equals 6 (100%) Equals 6/1 (100%)
1/1
Determine Rate Law 33 Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F, the reaction is 1.----order in A, 2.----- order in B, 3.----- order in C and 4.----- order overall. USE WORDS TO FILL IN THE BLANKS NOT NUMBERS (i.e., zero, first, second etc) !!!!! : Experiment
Initial conc of A, mol/L
Initial conc of B, mol/L
Initial conc of C, mol/L
Initial rate, mol/L.s
1
0.1
0.2
0.4
2 x 10-3
2
0.2
0.2
0.4
8 x 10-3
27-Sep-09 6:31 PM
View Attempt
3 of 5
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
3
0.3
0.4
0.4
3.6 x 10-2
4
0.4
0.6
0.2
9.6 x 10-2
Student Response
Value
Correct Answer
1. second
25%
Equals second (25%)
2. first
25%
Equals first (25%)
3. zero
25%
Equals zero (25%)
4. third
25%
Equals third (25%)
Score:
7.
1/1
Determine Rate Law 7 Consider the reaction of A(g) + B(g) + C(g) => D(g) for which the following data were obtained: Experiment
Initial [A], mol/L
Initial [B], mol/L
Initial [C], mol/L
Initial rate, mol/L.s
1
0.0500
0.0500
0.0100
6.25 x 10-3
2
0.100
0.0500
0.0100
2.50 x 10-2
3
0.100
0.100
0.0100
1.00 x 10-1
4
0.0500
0.0500
0.0200
1.25 x 10-2
What is the rate law for the reaction?
Student Response 1. rate = k[A][B][C]
Value
Correct Answer
Feedback
0%
2. rate = 100% 2 2 k[A] [B] [C] 3. rate = 0% 2 k[A] [B][C] 4. rate = k[A]2[B]2
0%
5. rate = k[A][B]
0%
Score:
8.
1/1
Calculate k from Rate Law 36 Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F, Experiment
Initial conc of A, mol/L
Initial conc of B, mol/L
Initial conc of C, mol/L
Initial rate, mol/L.s
27-Sep-09 6:31 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
1
0.1
0.2
0.4
2 x 10-3
2
0.2
0.2
0.4
4 x 10-3
3
0.3
0.4
0.4
2.4 x 10-2
4
0.4
0.6
0.2
3.6 x 10-2
Calculate the value of k to 3 significant figures and do not use scientific notation!
Student Response 1. 1.25 Score:
9.
Value
Correct Answer
100%
Equals 1.25 (100%)
1/1
Units of k 1 Which of the following would be a reasonable unit for the rate constant of a first order reaction?
Student Response
Value
1. mol/L.sec 2
Correct Answer
Feedback
0% 2
2. mol /sec.L 0% 3. 1/sec
100%
4. L/mol.sec
0%
5. L2/mol2.sec 0% Score:
1/1
10. IRL 1 t 1 In a first order decomposition in which the rate constant is 0.0780 sec-1, how long will it take (in seconds) until 0.207 mol/L of the compound is left, if there was 0.821 mol/L at the start? (give answer to 3 sig figs using E notation)?
Student Response Answer 1.77E1 Score:
Value
Correct Answer
100%
17.664
1/1
11. IRL 1 kt % 2 In a first order decomposition, the constant is 0.00354 sec-1. What percentage of the compound has decomposed after 43.3 seconds?
4 of 5
27-Sep-09 6:31 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Response Answer 14.2 Score:
Value
Correct Answer
100%
14
1/1
12. IRL 1 k 1 When 0.990 mol/L of a compound X decomposes via a first order reaction, there are 0.360 mol/L left after 66.3 seconds. Calculate the rate constant, k, in sec-1.
Student Response Answer .0153 Score:
Value
Correct Answer
100%
0.0153
1/1
Done
5 of 5
27-Sep-09 6:31 PM
1 of 5
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
View Attempt 2 of unlimited Title:
Chapter 16(1)
Started:
September 27, 2009 5:56 PM
Submitted:
September 27, 2009 6:31 PM
Time spent:
00:34:59
Total score: 12/12 = 100% 1.
Total score adjusted by 0.0
Maximum possible score: 12
Average Rate 4 The compound AX2 decomposes according to the equation, 2 AX2(g) => 2 AX(g) + X2(g). In one experiment, [AX2] was measured at various times, and these data recorded: Time (s)
[AX2] mol/L
0
0.0500
2.0
0.0448
6.0
0.0300
8.0
0.0249
10.0
0.0209
20.0
0.0088
What is the average rate from 2.0 to 6.0 seconds in mol / L s? Use 3 significant figures. [don't include units in your answer; if you want to use scientific notation, use the E format. e.g., 0.0011 is 1.1E-3
Student Response 1. 3.7E-3
Score:
2.
Value
Correct Answer
100%
Equals 0.0037 (0%) Equals 3.7E-3 (100%) Contains .0037 (100%) Equals 3.70E-3 (100%)
1/1
Relative Rates of Substances 17 Consider the reaction, 2 D(g) + 3 E(g) + F(g) => 2 G(g) + H(g) When [H] is increasing at 0.47 mol/Ls, how quickly is [D] decreasing?
Student Response Answer .94 Score:
3.
Value
Correct Answer
100%
0.940
1/1
Rate Law General 6 What is the overall reaction order for Cl2 in a reaction with the following rate law? Rate = k[Cl2][H+]2[CO]2
27-Sep-09 6:31 PM
View Attempt
2 of 5
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Value Response 1. First
100%
2. Second
0%
3. Third
0%
4. Fourth
0%
5. Fifth
0%
Score:
4.
Correct Answer Feedback
1/1
Known Rate Law Change Conc 54 For the reaction, A(g) + B(g) => AB(g), the rate is 0.750 mol/L.s when the initial concentrations of both A and B are 2.00 mol/L. If the reaction is first order in A and first order in B, what is the rate when the initial concentration of A = 3.72 mol/L and that of B = 2.69 mol/L (give answers in E notation to 3 significant figures)
Student Response Answer 1.88 Score:
5.
Value
Correct Answer
100%
1.9
1/1
Known Rate Law, Change Conc 26 Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of BrO3- is doubled and that of Br- is tripled? Just put in the number as a whole number or fraction.
Student Response 1. 6
Score:
6.
Value
Correct Answer
100%
Equals 6 (100%) Equals 6/1 (100%)
1/1
Determine Rate Law 33 Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F, the reaction is 1.----order in A, 2.----- order in B, 3.----- order in C and 4.----- order overall. USE WORDS TO FILL IN THE BLANKS NOT NUMBERS (i.e., zero, first, second etc) !!!!! : Experiment
Initial conc of A, mol/L
Initial conc of B, mol/L
Initial conc of C, mol/L
Initial rate, mol/L.s
1
0.1
0.2
0.4
2 x 10-3
2
0.2
0.2
0.4
8 x 10-3
27-Sep-09 6:31 PM
View Attempt
3 of 5
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
3
0.3
0.4
0.4
3.6 x 10-2
4
0.4
0.6
0.2
9.6 x 10-2
Student Response
Value
Correct Answer
1. second
25%
Equals second (25%)
2. first
25%
Equals first (25%)
3. zero
25%
Equals zero (25%)
4. third
25%
Equals third (25%)
Score:
7.
1/1
Determine Rate Law 7 Consider the reaction of A(g) + B(g) + C(g) => D(g) for which the following data were obtained: Experiment
Initial [A], mol/L
Initial [B], mol/L
Initial [C], mol/L
Initial rate, mol/L.s
1
0.0500
0.0500
0.0100
6.25 x 10-3
2
0.100
0.0500
0.0100
2.50 x 10-2
3
0.100
0.100
0.0100
1.00 x 10-1
4
0.0500
0.0500
0.0200
1.25 x 10-2
What is the rate law for the reaction?
Student Response 1. rate = k[A][B][C]
Value
Correct Answer
Feedback
0%
2. rate = 100% 2 2 k[A] [B] [C] 3. rate = 0% 2 k[A] [B][C] 4. rate = k[A]2[B]2
0%
5. rate = k[A][B]
0%
Score:
8.
1/1
Calculate k from Rate Law 36 Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F, Experiment
Initial conc of A, mol/L
Initial conc of B, mol/L
Initial conc of C, mol/L
Initial rate, mol/L.s
27-Sep-09 6:31 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
1
0.1
0.2
0.4
2 x 10-3
2
0.2
0.2
0.4
4 x 10-3
3
0.3
0.4
0.4
2.4 x 10-2
4
0.4
0.6
0.2
3.6 x 10-2
Calculate the value of k to 3 significant figures and do not use scientific notation!
Student Response 1. 1.25 Score:
9.
Value
Correct Answer
100%
Equals 1.25 (100%)
1/1
Units of k 1 Which of the following would be a reasonable unit for the rate constant of a first order reaction?
Student Response
Value
1. mol/L.sec 2
Correct Answer
Feedback
0% 2
2. mol /sec.L 0% 3. 1/sec
100%
4. L/mol.sec
0%
5. L2/mol2.sec 0% Score:
1/1
10. IRL 1 t 1 In a first order decomposition in which the rate constant is 0.0780 sec-1, how long will it take (in seconds) until 0.207 mol/L of the compound is left, if there was 0.821 mol/L at the start? (give answer to 3 sig figs using E notation)?
Student Response Answer 1.77E1 Score:
Value
Correct Answer
100%
17.664
1/1
11. IRL 1 kt % 2 In a first order decomposition, the constant is 0.00354 sec-1. What percentage of the compound has decomposed after 43.3 seconds?
4 of 5
27-Sep-09 6:31 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Response Answer 14.2 Score:
Value
Correct Answer
100%
14
1/1
12. IRL 1 k 1 When 0.990 mol/L of a compound X decomposes via a first order reaction, there are 0.360 mol/L left after 66.3 seconds. Calculate the rate constant, k, in sec-1.
Student Response Answer .0153 Score:
Value
Correct Answer
100%
0.0153
1/1
Done
5 of 5
27-Sep-09 6:31 PM
