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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?

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?

University Physics Volume 2
University Physics Volume 2
18th Edition
ISBN:9781938168161
Author:OpenStax
Publisher:OpenStax
Chapter9: Current And Resistance
Section: Chapter Questions
Problem 28P: An aluminum wire 1.628 mm in diameter (14-gauge) carries a current of 3.00 amps, (a) What is the...
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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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