Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
View View Attempt 3 of unlimited
Title: Started: Submitted: Time spent: Chapter 21(1) November 29, 2009 5:11 PM November 29, 2009 5:35 PM 00:23:53 Total score adjusted by 0.0 Maximum possible score: 12
Total score: 11/12 = 91.67% 1. Balance Redox Acid 36
Balance the following equation in acidic solution using the lowest possible integers and give the coefficient of water. Zn(s) + NO3-(aq) Zn2+(aq) + N2(g)
Student Value Response 1. 5 2. 6 3. 2 4. 3 5. 4 Score: 1/1 0% 100% 0% 0% 0%
Correct Answer
Feedback
2.
Balance Redox Base 15 Balance the following equation in basic solution using the lowest possible integers and give the coefficient of water. I-(aq) + O2(g) I2(s) + OH(aq)
Student Value Response 1. 1 2. 3 3. 4 4. 2 Score: 1/1 0% 0% 0% 100%
Correct Answer
Feedback
3.
Balance Redox Acid 31 Balance the following equation in acidic solution using the lowest possible integers and give the coefficient of H+. Cr2O72- + Fe2+(aq) Cr3+(aq) + Fe3+(aq)
1 of 6
29-Nov-09 5:35 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Value Response 1. 14 2. 6 3. 10 4. 7 5. 8 Score: 1/1 100% 0% 0% 0% 0%
Correct Answer
Feedback
4.
Balance Redox Base 25 Balance the following equation in basic solution using the lowest possible integers and give the coefficient of hydroxide ion. MnO4-(aq) + C2O42- MnO2(s) + CO32- (aq)
Student Value Response 1. 1 2. 3 3. 4 4. 2 5. 0 Score: 1/1 0% 0% 100% 0% 0%
Correct Answer
Feedback
5.
Voltaic Cells Picture 2 Which letter represents the cathode in the figure shown
Student Value Response 1. S 2. T 3. X 4. Y 0% 100% 0% 0%
Correct Answer
Feedback
2 of 6
29-Nov-09 5:35 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
5. Z Score: 1/1
0%
6.
Voltaic Cells Picture 10 Consider the Figure shown in which X represent Zn(s), T represents Co(s), and S is a solution that is 1.0 M in Co2+.
At which electrode does oxidation occur? The reduction potentials of Co2+ and Zn2+ are -0.27 V and -0.76 V, respectively.
Student Value Response a. S b. T c. X d. Y e. Z Score: 1/1 0% 0% 100% 0% 0%
Correct Answer
Feedback
7.
Chapter 12 Eo values 14 Determine Eo for the following reaction, using the given standard reduction potentials: Co3+(aq) + Zn(s) Co2+(aq) + Zn2+(aq) Eo for Zn2+(aq) = -0.76 V; Eo for Co3+(aq) = 1.81 V Do not put in units.
Student Response 1. 2.57
Value 100%
Correct Answer Equals 2.57 Equals (100%) 2.57 (0%)
Score:
1/1
8.
Ecell Calc 4
3 of 6
29-Nov-09 5:35 PM
iew Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Calculate Eo cell for the reaction: Mn2+(aq) + Co3+(aq) => MnO2(s) + Co2+(aq) (in acidic solution) Use the fact that the reduction potential for MnO2(s) is +1.23 V and for Co3+(aq) it is +1.82 V. You should give your answer with 1 digit before the decimal point and to 2 decimal places. Do NOT include units..... Also - do not use scientific notation!
Student Response 1. -3.05
Value 0%
Correct Answer Equals 0.59 (100%) Equals .59 (100%) Equals 5.90E-1 (100%)
Score:
0/1
9.
Chapter 12 Eo values 55 Determine Eo for the following reaction, using the given standard reduction potentials: Ag+(aq) + Mn(s) Ag(s) + Mn2+(aq) Eo for Mn2+(aq) = -1.18 V Eo for Ag+(aq) = 0.80 V Do not put in units.
Student Response 1. 1.98
Value 100%
Correct Answer Equals 1.98 (100%) Equals 1.98 (0%)
Score:
1/1
10. Best Agent from List 3 Consider the following half-reactions. Which of these is the strongest reducing agent listed here? I2(s) + 2 e- => 2 I-(aq) Eo = 0.53 V S2O82-(aq) + 2 e- => 2 SO42-(aq) Eo = 2.01 V Cr2O72-(aq) + 14 H+ + 6 e-=> Cr3+(aq) + 7 H2O(l) Eo = 1.33 V
Student Response 1. I2(s) 2. I-(aq) 4. SO425. Cr2O72-
Value 0% 100%
Correct Answer
Feedback
3. S2O82-(aq) 0% 0% 0%
of 6
29-Nov-09 5:35 PM
View Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
6. Cr3+(aq) Score: 1/1
0%
11. Redox Agents 5 Identify the oxidizing agent and the reducing agent in the reaction. 8H+(aq) + 6Cl(aq) + Sn(s) + 4NO3(aq) SnCl62(aq) + 4NO2(g) + 4H2O(l)
Student Value Response 1. oxidizing 100% agent: NO3 ; reducing agent: Sn 2. oxidizing 0% agent: Cl ; reducing agent: H+ 3. oxidizing 0% agent: NO3; reducing agent: H+ 4. oxidizing 0% agent: Sn ; reducing agent: Cl Score: 1/1
Correct Answer
Feedback
12. Ered from Ecel and another E 1 Consider the reaction between sulfite and a metal anion, X2-, to form the metal, X, and thiosulfate: 2 X2-(aq) + 2 SO32- + 3 H2O(l) => 2 X(s) + S2O32- (aq) + 6 OHfor which Eo cell = 0.28. Given that the Eo red for sulfite is -0.57 V, calculate Eo red for X. Even though it is incorrect to do so, as usual, use THREE significant figures for your answer.
5 of 6
29-Nov-09 5:35 PM
iew Attempt
https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent...
Student Response Answer -.850 Score: 1/1
Value 100%
Correct Answer -0.850
Done
of 6
29-Nov-09 5:35 PM