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View Attempt 1 of unlimited Title:
Chapter 16(1)
Started:
September 27, 2009 4:09 PM
Submitted:
September 27, 2009 5:09 PM
Time spent:
00:59:51
To t a l s c o r e : 8 / 1 2 = 6 6 . 6 7 % 1.
Total score adjusted by 0.0 Maximum possible score: 12
Av e r a g e R a t e 2 The compound AX 2 decomposes according to the equation, 2 AX 2 (g) = > 2 AX(g) + X 2 ( g ) . I n 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 6.0 to 20.0 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. -7.57E -4
Score: 2.
Value Correct Answer
0%
Equals Equals Equals Equals Equals Equals
0 . 0 0 1 5 1 (100% ) 0 . 0 0 1 5 (100% ) 1 . 5 E - 3 (100% ) 1 . 5 1 E - 3 (100% ) . 0 0 1 5 1 (100% ) . 0 0 1 5 (100% )
0/1
Relative Rates of Substances 15 Consider the reaction, 2 D(g) + 3 E(g) + F(g) = > 2 G(g) + H(g) When [ G] is increasing at 0.81 mol/ Ls, how quickly is [ F] decreasing?
Student Response Answer 1.6 Score: 3.
0/1
Rate Law General 1
Value 0%
Correct Answer 0.405
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What is the overall reaction order for a reaction with the following rate law? R ate = k[BrO 3 - ] [ B r - ] [ H + ] 2
Student Value Response 1. First
0%
2. Second
0%
3. Third
0%
4. Fourth
100%
5. Fifth
0%
Score: 4.
Correct Answer
Feedback
1/1
Know n Rate Law , Change Conc 47 Consider the reaction with the rate law, R ate = k[BrO 3 - ] [ B r - ] [ H + ] 2 By what factor does the rate change if the concentration of BrO 3 - is decreased by a factor of 2, that of Br - is doubled and that of H + is doubled ?
Student Response 1. 4
Score: 5.
Value 100%
Correct
Answer
Equals 4 (100% ) Equals 4 / 1 (100% )
1/1
Know n Rate Law , Change Conc 25 Consider the reaction with the rate law, R ate = k[BrO 3 - ] [ B r - ] [ H + ] 2 By what factor does the rate change if the concentration of BrO3 - is tripled and that of Br - is tripled? Just put in the number as a whole number or fraction.
Student Response 1. 9
Score: 6.
Value 100%
Correct
Answer
Equals 9 (100% ) Equals 9 / 1 (100% )
1/1
Determine Rate Law 37 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, Initial conc of B, Initial conc of C, Initial rate, mol/L mol/L mol/L mol/ L.s
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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
7.2 x 10 - 2
Student Response 1. first
25%
Equals f i r s t (25% )
2. second
25%
Equals s e c o n d (25% )
3. zero
25%
Equals z e r o (25% )
4. third
25%
Equals t h i r d (25% )
Score: 7.
Value Correct Answer
1/1
Determine Rate Law 41 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, Initial conc of B, Initial conc of C, Initial rate, mol/L mol/L mol/L mol/ L.s
1
0.1
0.2
0.4
2 x 10 - 3
2
0.2
0.2
0.4
2 x 10 - 3
3
0.3
0.4
0.4
4 x 10 - 3
4
0.4
0.6
0.2
1.5 x 10 - 3
Student Response 1. zero
25%
Equals z e r o (25% )
2. first
25%
Equals f i r s t (25% )
3. second
25%
Equals s e c o n d (25% )
4. third
25%
Equals t h i r d (25% )
Score: 8.
Value Correct Answer
1/1
Calculate k from Rate Law 21 For the reaction, 2 A(g) + 2 B(g) = > C(g) + 3 D(g), the following data were obtained at constant temperature. Experiment
Initial [A], mol/L
Initial [B], mol/L
Initial R ate, M/min
1
0.11
0.15
2.0 x 10 - 5
2
0.11
0.30
4.0 x 10 - 5
3
0.22
0.45
1.2 x 10 - 4
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4
0.22
0.60
1.6 x 10 - 4
Calculate the value of k to 3 significant figures.
Student Response
Value Correct Answer
1. 1.21E -3
Score: 9.
100%
Equals 0 . 0 0 1 2 1 (100% ) Equals . 0 0 1 2 1 (100% ) Equals 1 . 2 1 E - 3 (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 1.mol/L.sec
Value
Correct Answer
Feedback
0%
2. mol 2 / sec.L2 0% 3. 1/sec 4.L/mol.sec
100% 0%
5. L2 / m o l 2 .sec 0% Score:
1/1
10. I RL 1 c 2 A reaction has a rate constant of 0.0348 sec- 1 , how much of the compound (in mol/ L) is left after 7.41 sec, if there was 0.150 mol/ L at the start? (give answer to 3 sig figs using E notation)?
Student Response Answer 1.48E-1 Score:
Value 0%
Correct Answer 0.116
0/1
11. I RL 1 t 8 A reaction has a rate constant of 0.00473 sec- 1 , how long will it take (in minutes) until 0.463 mol/ L of the compound is left, if there was 0.629 mol/ L at the start? (give answer to 3 sig figs using E notation)?
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Student Response Answer 1.08E0 Score:
Value 100%
Correct Answer 1.080
1/1
12. I RL 1 kt % 4 In a first order decomposition, the constant is 0.00827 sec- 1 . What percentage of the compound has decomposed after 8.24 minutes?
Student Response Answer 59.7 Score:
Done
0/1
Value 0%
Correct Answer 98.3
