Chem 1332
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- Words: 622
- Pages: 4
View Attempt
1 of 4
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
View Attempt 2 of unlimited Title:
Chapter 18(2)
Started:
November 1, 2009 7:13 PM
Submitted:
November 1, 2009 8:04 PM
Time spent:
00:50:38
Total score: 10/12 = 83.33% 1.
Total score adjusted by 0.0
Maximum possible score: 12
Conjugate Pair 10 Give the conjugate acid of SO42-. 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 2 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 NH4+ + HCO3- <=> H2CO3 + NH3
Student Value Response a. Kc = 1
0%
b. Kc < 1
100%
c. Kc > 1
0%
Score:
3.
Correct Answer
Feedback
0/1
Acid Strength Trends 1 Select the weaker acid from each of the following pairs: I. HBr or H2Se II. HClO3 or H2SO3 III. H2SO3 or H2SO4
Student Value Response
Correct Answer
Feedback
1. I. HBr, 0% II. HClO3 III.
01-Nov-09 9:07 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
H2SO4 2. I. HBr, 0% II. H2SO3 III. H2SO4 3. I. H2Se, 0% II. HClO3 III. H2SO3 4. I. H2Se, 100% II. H2SO3 III. H2SO3 5. I. HBr, 0% II. H2SO3 III. H2SO3 Score:
4.
1/1
Ionic Solutions 25 Is an aqueous solution of NaClO4 acidic, basic or neutral (use A, B or N)?
Student Response 1. A Score:
5.
Value
Correct Answer
0%
Equals N (100%)
0/1
pH to Ka 2 A 0.00573 mol sample of a weak acid, HY, is dissolved in enough water to form 0.0173 L of solution. If the pH of the solution is 4.03, what is the Ka of HY? Use E notation with 3 significant figures.
Student Response Answer 2.63E-8 Score:
6.
Value
Correct Answer
100%
2.63E-8 (2.63 × 10-8)
1/1
Ka to OH 7 The Ka of cyanic acid, HOCN is 3.5 x 10-4. What is [OH-] in a 0.135 M solution of HOCN? Use E notation and 3 significant figures.
2 of 4
01-Nov-09 9:07 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Response Answer 1.45E-12 Score:
7.
Value
Correct Answer
100%
1.45E-12 (1.45 × 10-12)
1/1
Ka to H 5 The Ka of formic acid, HCOOH is 1.8 x 10-4. What is [H3O+] in a 0.303 M solution of HCOOH ?
Student Response Answer 7.39E-3 Score:
8.
Value
Correct Answer
100%
0.00739
1/1
Ka to pOH 2 Q Use the values of Ka1 = 0.056 and Ka2 = 5.4 x 10-5 to calculate the pOH in a 0.570 M solution of oxalic acid (H2C2O4)
Student Response Answer 13.3 Score:
9.
Value
Correct Answer
100%
13.2
1/1
Kb to pH 1 Calculate the pH of 0.708 M diethylamine, Kb = 8.6 x 10-4?
Student Response Answer 12.4 Score:
Value
Correct Answer
100%
12.39
1/1
10. Ions K 2 A weak base, B, has a Kb value of 9.64 x 10-2. What is the Ka of HB+? Use E notation and 3 significant figures.
Student Response Answer 1.04E-13
3 of 4
Value
Correct Answer
100%
1.04E-13 (1.04 × 10-13)
01-Nov-09 9:07 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Score:
1/1
11. Ion pH calculation 57 What is the pH of 0.898 M sodium hydrazoate, NaN3? The Ka of hydrazoic acid, HN3 is 1.9 x 10-3.
Student Response Answer 8.34 Score:
Value
Correct Answer
100%
8.34
1/1
12. Lewis 11 In the equation below, does H2O act as a Lewis Acid, a Lewis Base, or Neither (answer A, B, N) Fe3+ + 2 H2O <=> FeOH2+ + H3O+
Student Response 1. B Score:
Value
Correct Answer
100%
Equals B (100%)
1/1
Done
4 of 4
01-Nov-09 9:07 PM
1 of 4
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
View Attempt 2 of unlimited Title:
Chapter 18(2)
Started:
November 1, 2009 7:13 PM
Submitted:
November 1, 2009 8:04 PM
Time spent:
00:50:38
Total score: 10/12 = 83.33% 1.
Total score adjusted by 0.0
Maximum possible score: 12
Conjugate Pair 10 Give the conjugate acid of SO42-. 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 2 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 NH4+ + HCO3- <=> H2CO3 + NH3
Student Value Response a. Kc = 1
0%
b. Kc < 1
100%
c. Kc > 1
0%
Score:
3.
Correct Answer
Feedback
0/1
Acid Strength Trends 1 Select the weaker acid from each of the following pairs: I. HBr or H2Se II. HClO3 or H2SO3 III. H2SO3 or H2SO4
Student Value Response
Correct Answer
Feedback
1. I. HBr, 0% II. HClO3 III.
01-Nov-09 9:07 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
H2SO4 2. I. HBr, 0% II. H2SO3 III. H2SO4 3. I. H2Se, 0% II. HClO3 III. H2SO3 4. I. H2Se, 100% II. H2SO3 III. H2SO3 5. I. HBr, 0% II. H2SO3 III. H2SO3 Score:
4.
1/1
Ionic Solutions 25 Is an aqueous solution of NaClO4 acidic, basic or neutral (use A, B or N)?
Student Response 1. A Score:
5.
Value
Correct Answer
0%
Equals N (100%)
0/1
pH to Ka 2 A 0.00573 mol sample of a weak acid, HY, is dissolved in enough water to form 0.0173 L of solution. If the pH of the solution is 4.03, what is the Ka of HY? Use E notation with 3 significant figures.
Student Response Answer 2.63E-8 Score:
6.
Value
Correct Answer
100%
2.63E-8 (2.63 × 10-8)
1/1
Ka to OH 7 The Ka of cyanic acid, HOCN is 3.5 x 10-4. What is [OH-] in a 0.135 M solution of HOCN? Use E notation and 3 significant figures.
2 of 4
01-Nov-09 9:07 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Response Answer 1.45E-12 Score:
7.
Value
Correct Answer
100%
1.45E-12 (1.45 × 10-12)
1/1
Ka to H 5 The Ka of formic acid, HCOOH is 1.8 x 10-4. What is [H3O+] in a 0.303 M solution of HCOOH ?
Student Response Answer 7.39E-3 Score:
8.
Value
Correct Answer
100%
0.00739
1/1
Ka to pOH 2 Q Use the values of Ka1 = 0.056 and Ka2 = 5.4 x 10-5 to calculate the pOH in a 0.570 M solution of oxalic acid (H2C2O4)
Student Response Answer 13.3 Score:
9.
Value
Correct Answer
100%
13.2
1/1
Kb to pH 1 Calculate the pH of 0.708 M diethylamine, Kb = 8.6 x 10-4?
Student Response Answer 12.4 Score:
Value
Correct Answer
100%
12.39
1/1
10. Ions K 2 A weak base, B, has a Kb value of 9.64 x 10-2. What is the Ka of HB+? Use E notation and 3 significant figures.
Student Response Answer 1.04E-13
3 of 4
Value
Correct Answer
100%
1.04E-13 (1.04 × 10-13)
01-Nov-09 9:07 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Score:
1/1
11. Ion pH calculation 57 What is the pH of 0.898 M sodium hydrazoate, NaN3? The Ka of hydrazoic acid, HN3 is 1.9 x 10-3.
Student Response Answer 8.34 Score:
Value
Correct Answer
100%
8.34
1/1
12. Lewis 11 In the equation below, does H2O act as a Lewis Acid, a Lewis Base, or Neither (answer A, B, N) Fe3+ + 2 H2O <=> FeOH2+ + H3O+
Student Response 1. B Score:
Value
Correct Answer
100%
Equals B (100%)
1/1
Done
4 of 4
01-Nov-09 9:07 PM
