Chem 1332
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- Words: 592
- Pages: 4
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
View Attempt 1 of unlimited Title:
Chapter 18(2)
Started:
November 1, 2009 6:12 PM
Submitted:
November 1, 2009 6:35 PM
Time spent:
00:23:03
Total score: 9/12 = 75% 1.
Total score adjusted by 0.0
Maximum possible score: 12
Conjugate Pair 22 Give the conjugate base of H2SO4. Write it ignoring super and subscripts (so, HPO42- would be HPO42- or bromide would be Br-... NOT Br1-)
Student Response 1. HSO41-
Score:
2.
Value
Correct Answer
100%
Equals HSO4- (100%) Equals HSO41- (100%)
1/1
Combined Acid Base 3 Use a table of Ka or Kb values to determine whether Kc for the following reaction is less than, equal to or greater than 1 HCO3- + F- <=> CO32- + HF
Student Value Response 1. Kc = 1
0%
2. Kc < 1
100%
3. Kc > 1
0%
Score:
3.
Correct Answer
Feedback
1/1
Acid Strength Trends 3 Select the weaker acid from each of the following pairs: I. HI or HBr II. H3AsO3 or H2SeO3 III. HNO3 or HNO2
Student Value Response
Correct Answer
Feedback
1. I. HBr II. 0% H2SeO3 III. HNO2
1 of 4
01-Nov-09 7:12 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
2. I. HBr II. 100% H3AsO3 III. HNO2 3. I. HBr II. 0% H3AsO3 III. HNO3 4. I. HI II. 0% H3AsO3 III. HNO2 5. I. HI II. 0% H2SeO3 III. HNO3 Score:
4.
0/1
Ionic Solutions 36 Is an aqueous solution of Na2SO3 acidic, basic or neutral (use A, B or N)?
Student Response 1. B Score:
5.
Value
Correct Answer
100%
Equals B (100%)
1/1
pH to Ka 1 A 0.385 M solution of a weak acid, HA, has a pH of 4.75. Calculate Ka for the acid. Use E notation and 3 significant figures.
Student Response Answer 8.21E-10 Score:
6.
Value
Correct Answer
100%
8.21E-10 (8.21 × 10-10)
1/1
Ka to H 10 The Ka of phenol, C6H5OH, is 1.00 x 10-10. What is [H3O+] in a 0.746 M solution of phenol? Use E notation and 3 significant figures.
Student Response Answer 8.64E-6 Score:
2 of 4
Value
Correct Answer
100%
8.64E-6 (8.64 × 10-6)
1/1
01-Nov-09 7:12 PM
View Attempt
3 of 4
7.
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Ka to pOH 10 The Ka of thiophenol, C6H5SH, is 3.2 x 10-7. Calculate the pOH of a 0.552 M solution of thiophenol?
Student Response Answer 10.6 Score:
8.
Value
Correct Answer
100%
10.62
1/1
Ka to HA 1 Q Use the values of Ka1 = 0.056 and Ka2 = 5.4 x 10-5 to calculate the [H2C2O4] in a 0.196 M solution of oxalic acid (H2C2O4)
Student Response Answer 7.70E-4 Score:
9.
Value
Correct Answer
0%
0.116
0/1
Kb to pH 2 Calculate the pH of 0.296 M dimethylamine, Kb = 5.9 x 10-4?
Student Response Answer 5.65 Score:
Value
Correct Answer
0%
12.12
0/1
10. Ions K 1 A weak acid, HA, has a Ka value of 5.90 x 10-5. What is the Kb of A-? Use E notation and 3 significant figures.
Student Response Answer 1.69E-10 Score:
Value
Correct Answer
100%
1.69E-10 (1.69 × 10-10)
1/1
11. Ion pH calculation 6 What is the pH of 0.750 M methylammonium chloride, CH3NH3Cl? The Kb of CH3NH2 is 4.2 x 10-4.
01-Nov-09 7:12 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Response Answer 5.37 Score:
Value
Correct Answer
100%
5.37
1/1
12. Lewis 5 Is CN- likely to act as a Lewis Acid, a Lewis Base, or Neither (answer A, B, N)
Student Response 1. B Score:
Value
Correct Answer
100%
Equals B (100%)
1/1
Done
4 of 4
01-Nov-09 7:12 PM
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
View Attempt 1 of unlimited Title:
Chapter 18(2)
Started:
November 1, 2009 6:12 PM
Submitted:
November 1, 2009 6:35 PM
Time spent:
00:23:03
Total score: 9/12 = 75% 1.
Total score adjusted by 0.0
Maximum possible score: 12
Conjugate Pair 22 Give the conjugate base of H2SO4. Write it ignoring super and subscripts (so, HPO42- would be HPO42- or bromide would be Br-... NOT Br1-)
Student Response 1. HSO41-
Score:
2.
Value
Correct Answer
100%
Equals HSO4- (100%) Equals HSO41- (100%)
1/1
Combined Acid Base 3 Use a table of Ka or Kb values to determine whether Kc for the following reaction is less than, equal to or greater than 1 HCO3- + F- <=> CO32- + HF
Student Value Response 1. Kc = 1
0%
2. Kc < 1
100%
3. Kc > 1
0%
Score:
3.
Correct Answer
Feedback
1/1
Acid Strength Trends 3 Select the weaker acid from each of the following pairs: I. HI or HBr II. H3AsO3 or H2SeO3 III. HNO3 or HNO2
Student Value Response
Correct Answer
Feedback
1. I. HBr II. 0% H2SeO3 III. HNO2
1 of 4
01-Nov-09 7:12 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
2. I. HBr II. 100% H3AsO3 III. HNO2 3. I. HBr II. 0% H3AsO3 III. HNO3 4. I. HI II. 0% H3AsO3 III. HNO2 5. I. HI II. 0% H2SeO3 III. HNO3 Score:
4.
0/1
Ionic Solutions 36 Is an aqueous solution of Na2SO3 acidic, basic or neutral (use A, B or N)?
Student Response 1. B Score:
5.
Value
Correct Answer
100%
Equals B (100%)
1/1
pH to Ka 1 A 0.385 M solution of a weak acid, HA, has a pH of 4.75. Calculate Ka for the acid. Use E notation and 3 significant figures.
Student Response Answer 8.21E-10 Score:
6.
Value
Correct Answer
100%
8.21E-10 (8.21 × 10-10)
1/1
Ka to H 10 The Ka of phenol, C6H5OH, is 1.00 x 10-10. What is [H3O+] in a 0.746 M solution of phenol? Use E notation and 3 significant figures.
Student Response Answer 8.64E-6 Score:
2 of 4
Value
Correct Answer
100%
8.64E-6 (8.64 × 10-6)
1/1
01-Nov-09 7:12 PM
View Attempt
3 of 4
7.
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Ka to pOH 10 The Ka of thiophenol, C6H5SH, is 3.2 x 10-7. Calculate the pOH of a 0.552 M solution of thiophenol?
Student Response Answer 10.6 Score:
8.
Value
Correct Answer
100%
10.62
1/1
Ka to HA 1 Q Use the values of Ka1 = 0.056 and Ka2 = 5.4 x 10-5 to calculate the [H2C2O4] in a 0.196 M solution of oxalic acid (H2C2O4)
Student Response Answer 7.70E-4 Score:
9.
Value
Correct Answer
0%
0.116
0/1
Kb to pH 2 Calculate the pH of 0.296 M dimethylamine, Kb = 5.9 x 10-4?
Student Response Answer 5.65 Score:
Value
Correct Answer
0%
12.12
0/1
10. Ions K 1 A weak acid, HA, has a Ka value of 5.90 x 10-5. What is the Kb of A-? Use E notation and 3 significant figures.
Student Response Answer 1.69E-10 Score:
Value
Correct Answer
100%
1.69E-10 (1.69 × 10-10)
1/1
11. Ion pH calculation 6 What is the pH of 0.750 M methylammonium chloride, CH3NH3Cl? The Kb of CH3NH2 is 4.2 x 10-4.
01-Nov-09 7:12 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Response Answer 5.37 Score:
Value
Correct Answer
100%
5.37
1/1
12. Lewis 5 Is CN- likely to act as a Lewis Acid, a Lewis Base, or Neither (answer A, B, N)
Student Response 1. B Score:
Value
Correct Answer
100%
Equals B (100%)
1/1
Done
4 of 4
01-Nov-09 7:12 PM
