a. What half-reaction takes place at the surface of the magnesium bar? (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.) b. What half-reaction takes place at the surface of the iron pipe? There is some oxygen around the iron pipe. (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.) + c. In which direction do electrons flow between the two surfaces?

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A magnesium bar with a mass of 6.5 kg is attached to a buried iron pipe to serve as a sacrificial anode. An average current of 0.018 A flows between the bar and the pipe.
a. What half-reaction takes place at the surface of the magnesium bar?
(Use the lowest possible coefficients. Be sure to specify states such as (ag) or (s). If a box is not needed, leave it blank.)
b. What half-reaction takes place at the surface of the iron pipe? There is some oxygen around the iron pipe.
(Use the lowest possible coefficients. Be sure to specify states such as (ag) or (s). If a box is not needed, leave it blank.)
c. In which direction do electrons flow between the two surfaces?
O from the iron pipe to the magnesium bar
O from the magnesium bar to the iron pipe
d. How many years would it take for the entire magnesium bar to be consumed?
years
Transcribed Image Text:A magnesium bar with a mass of 6.5 kg is attached to a buried iron pipe to serve as a sacrificial anode. An average current of 0.018 A flows between the bar and the pipe. a. What half-reaction takes place at the surface of the magnesium bar? (Use the lowest possible coefficients. Be sure to specify states such as (ag) or (s). If a box is not needed, leave it blank.) b. What half-reaction takes place at the surface of the iron pipe? There is some oxygen around the iron pipe. (Use the lowest possible coefficients. Be sure to specify states such as (ag) or (s). If a box is not needed, leave it blank.) c. In which direction do electrons flow between the two surfaces? O from the iron pipe to the magnesium bar O from the magnesium bar to the iron pipe d. How many years would it take for the entire magnesium bar to be consumed? years
Standard Reduction (Electrode) Potentials at 25 °C
Standard Reduction (Electrode) Potentials at 25 °C
Half-ell Reaction
E (volts)
Half-Cell Reaction
(volts)
Cr"(aq) + 3 e Cr[s)
Za"(aq) + 2 e-Zn[s)
-0.74
F2(8) + 2 e2 F'(aq)
2.87
-0.763
Ce* (aq) + e' Ce³*(aq)
Mno, (aq) + 8 H"(aq) + 5 e Mn²"(aq) + 4 H,0(1)
1.61
2 H,0() + 2 e-Hz(R) + 2 OH (aq)
-0.83
1.51
Mn2"(aq) + 2 e- Mn(s)
-1.18
Cl2(8) + 2 e 2 cI(aq)
1.36
A"(aq) + 3 e→Al(s)
-1.66
Cr20, (aq) + 14 H'(aq) + 6 e' →2 Cr*"(aq) + 7 H20(1)
1.33
Mg2"(aq) + 2 e- Mg(s)
-2.37
02(8) + 4 H"(aq) + 4 e2 H20(1)
1.229
Na"(aq) + e Na(s)
-2.714
Brz(1) + 2 e 2 Br'(aq)
K"(aq) +e K(s)
-2.925
1.08
NO, (aq) + 4 H"(aq) + 3 e NO(g) + 2 H,0)
Li (aq) + eLi(s)
-3.045
0.96
2 Hg2 (aq) + 2 e - Hg,"(aq)
0.920
Hg"(aq) + 2 e- Hg(1)
0.855
Ag"(aq) + e Ag(s)
0.799
Hg,"(aq) + 2 e–2 Hg()
0.789
Fe"(aq) + e
Fe²"(aq)
0.771
12(8) + 2 e2 I(aq)
0.535
Fe(CN), (aq) + e' Fe(CN),*(aq)
0.48
Cu2 (aq) + 2 e →Cu(s)
0.337
Cu"(aq) + e Cu"(aq)
0.153
S(s) + 2 H"(aq) + 2 e H,S(aq)
0.14
2 H"(aq) + 2 e- H2(8)
0.0000
Ph (aq) + 2 e' Ph(s)
-0.126
Sn2*(aq) + 2 e- Sn(s)
-0.14
Ni"(aq) + 2 e NI(s)
-0.25
Co2 (aq) + 2 e- Co(s)
-0.28
Ca*(aq) + 2 e-Cd(s)
-0.403
Cr"(aq) + e Cr²*(aq)
-0.41
Fe"(aq) + 2 e Fe(s)
-0.44
Transcribed Image Text:Standard Reduction (Electrode) Potentials at 25 °C Standard Reduction (Electrode) Potentials at 25 °C Half-ell Reaction E (volts) Half-Cell Reaction (volts) Cr"(aq) + 3 e Cr[s) Za"(aq) + 2 e-Zn[s) -0.74 F2(8) + 2 e2 F'(aq) 2.87 -0.763 Ce* (aq) + e' Ce³*(aq) Mno, (aq) + 8 H"(aq) + 5 e Mn²"(aq) + 4 H,0(1) 1.61 2 H,0() + 2 e-Hz(R) + 2 OH (aq) -0.83 1.51 Mn2"(aq) + 2 e- Mn(s) -1.18 Cl2(8) + 2 e 2 cI(aq) 1.36 A"(aq) + 3 e→Al(s) -1.66 Cr20, (aq) + 14 H'(aq) + 6 e' →2 Cr*"(aq) + 7 H20(1) 1.33 Mg2"(aq) + 2 e- Mg(s) -2.37 02(8) + 4 H"(aq) + 4 e2 H20(1) 1.229 Na"(aq) + e Na(s) -2.714 Brz(1) + 2 e 2 Br'(aq) K"(aq) +e K(s) -2.925 1.08 NO, (aq) + 4 H"(aq) + 3 e NO(g) + 2 H,0) Li (aq) + eLi(s) -3.045 0.96 2 Hg2 (aq) + 2 e - Hg,"(aq) 0.920 Hg"(aq) + 2 e- Hg(1) 0.855 Ag"(aq) + e Ag(s) 0.799 Hg,"(aq) + 2 e–2 Hg() 0.789 Fe"(aq) + e Fe²"(aq) 0.771 12(8) + 2 e2 I(aq) 0.535 Fe(CN), (aq) + e' Fe(CN),*(aq) 0.48 Cu2 (aq) + 2 e →Cu(s) 0.337 Cu"(aq) + e Cu"(aq) 0.153 S(s) + 2 H"(aq) + 2 e H,S(aq) 0.14 2 H"(aq) + 2 e- H2(8) 0.0000 Ph (aq) + 2 e' Ph(s) -0.126 Sn2*(aq) + 2 e- Sn(s) -0.14 Ni"(aq) + 2 e NI(s) -0.25 Co2 (aq) + 2 e- Co(s) -0.28 Ca*(aq) + 2 e-Cd(s) -0.403 Cr"(aq) + e Cr²*(aq) -0.41 Fe"(aq) + 2 e Fe(s) -0.44
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