1. Balance Redox Rxns:
Fe(OH)3 +
[Cr(OH)4]-1
Fe(OH)2 + CrO4-2

2. AP CHM HW
Read: Chapter 18

3. Review the Multiple-Choice Section of the Midterm.

4. Electro-chemistry

5. The flow of electrons through a metal
Metallic Conduction
The flow of electrons through a metal

6. The movement of ions (electrolytes) through a solution
Ionic Conduction
The movement of ions (electrolytes) through a solution
Electrolytic Conduct.

7. The surface or point in which oxidation or reduction takes place
Electrode
The surface or point in which oxidation or reduction takes place

8. The electrode where oxidation takes place
Anode
The electrode where oxidation takes place
An Ox (-)

9. The electrode where reduction takes place
Cathode
The electrode where reduction takes place
Red Cat (+)

10. Voltaic or Galvanic Cell
Electrochemical Cell in which:

11. a spontaneous oxidation-reduction reaction produces electrical energy

12. A cell where only oxidation or only reduction takes place
Half-Cell
A cell where only oxidation or only reduction takes place

13. An electrochemical cell must have two half-cells connected by a salt bridge

14. A half-cell will not work by itself Both half-cells are required

15. ) Allows electrical contact between the two half-cells
Salt Bridge
) Allows electrical contact between the two half-cells

16. ) Prevents mixing of the two half-cell solutions

17. ) Allows ions to flow maintaining electrical neutrality

18. Determining the Redox Rxn & Voltage of an Electrochemical Cell

19. Identify all molecules & ions (reactants) that exist in the electrolytic cell

20. ) Determine all possible half-reactions that could occur in the system

21. ) Look up each half-rxn from the Std. Redox Tables

22. ) Record each half-rxn & its standard voltage

23. ) Save the oxidation half-rxn that has the highest voltage

24. ) Save the reduction half-rxn that has the highest voltage

25. ) Balance the electrons between the two half-rxns

26. ) Add the two half-rxns to obtain the full electrochemical reaction

27. ) Add the voltage of each half-rxn to obtain the std. voltage required

28. Determine Eo
Zn(s) Ag+1(aq)
2 Ag(s) + Zn+2(aq)

29. AP CHM HW
Read: Chapter 18
Problems: 7 & 15a
Page: 526

30. REDOX Shorthand Zn|Zn+2||Ag+1|Ag ox red
Zn||Zn|Zn+2||Ag+1|Ag||Pt an ox red cat

31. Drill: Determine Shorthand Rxn & voltage when Cu+1 is reacts with solid potassium

32. Voltaic Cell Problems

33. Determine all when a cell with a Cu electrode in CuCl2(aq) is connected to a cell with a Zn electrode in ZnBr2(aq)

34. Determine all when a cell with a Fe electrode in FeCl3(aq) is connected to a cell with a Mn electrode in MnCl2(aq)

35. Determine all when a cell with a Mg electrode in MgCl2(aq) is connected to a cell with a Au electrode in AuCl3(aq)

36. Drill: What is the best reducing agent on the chart?

37. Electrolysis
Using electricity to force an, oh fooey, non-spontaneous electrochemical rxn

38. Chemical cell where electrolysis is being performed
Electrolytic Cell
Chemical cell where electrolysis is being performed

39. How to determine the Redox Rxn & voltage of an Electrolytic Cell

40. Identify all molecules & ions (reactants) that exist in the electrolytic cell

41. ) Determine all possible half-reactions that could occur in the system

42. ) Look up each half-rxn from the Std. Redox Tables

43. ) Record each half-rxn & its standard voltage

44. ) Save the oxidation half-rxn that has the highest voltage

45. ) Save the reduction half-rxn that has the highest voltage

46. ) Balance the electrons between the two half-rxns

47. ) Add the two half-rxns to obtain the full electrochemical reaction

48. ) Add the voltage of each half-rxn to obtain the std. voltage required

49. Determine the rxn that takes place when 1
Determine the rxn that takes place when 1.5 V is passed through two Pt electrodes in a solution containing MgI2(aq) & ZnCl2(aq)

50. AP CHM HW
Read: Chapter 18
Problems: 23
Page: 527

51. Determine the rxn that takes place when
2.5 V is passed through two Pt electrode in a solution of NaCl(aq)

52. Determine the rxn that takes place when
electricity is passed through two Pt electrode in molten NaCl

53. Drill: Determine the rxn that takes place when
electricity is passed through two Pt electrodes in ZnCl2(aq)

54. A car battery has lead & lead(IV)oxide electrodes in an acidified aqueous lead(II)sulfate solution. Using the book, determine the voltage that can be produced.

55. Relating Equations
DGo = DHo - TDSo
DGo = -RTlnKeq
DGo = -nFEo

56. Determine rxn, Eo, DGo, & Keq for a voltaic cell with half-cells containing Ni(s) in NiCl2(aq) & Sn(s) in SnCl2(aq).

57. for non-standard conditions
Nernst Equation
E = Eo - (RT/nF)lnQ
for non-standard conditions

58. Determine the voltage of a cell with a silver electrode in 1
Determine the voltage of a cell with a silver electrode in 1.0 M AgNO3 & an iron electrode in 0.10 M FeCl2 at 27oC

59. Determine the voltage of a cell with a silver electrode in 1
Determine the voltage of a cell with a silver electrode in 1.0 M AgNO3 & a zinc electrode in M ZnCl2 at 27oC

60. Drill: Determine the rxns that take place when 9.65 mA is passed for 2.5 Hrs through two Pt electrodes in a solution containing MnBr2(aq) & CuF2(aq)

61. Determine the voltage of a cell with a copper electrode in 0
Determine the voltage of a cell with a copper electrode in 0.10 M CuI & a zinc electrode in 1.0 M ZnCl2 at 27oC

62. Determine the voltage of a cell with a silver electrode in 0
Determine the voltage of a cell with a silver electrode in 0.10 M AgNO3 & a zinc electrode in 1.0 M ZnCl2 at 27oC

63. AP CHM HW
Read: Chapter 18
Problems: 41
Page: 528

64. The test on electrochemistry will be on ____day.

65. Electroplating & Electro-purifying

66. Electrolysis
During electrolysis, oxidation & degradation would occur at the anode while reduction & electroplating would occur at the cathode

67. Amount (mass, volume, moles, etc) can be determined from the charge
Current Formula
Current = charge/unit time
Amps = coul/sec
Amount (mass, volume, moles, etc) can be determined from the charge

68. Calculate the mass of copper plated onto the cathode when a 9
Calculate the mass of copper plated onto the cathode when a 9.65 mAmp current is applied to a solution of CuSO4 for 5.0 minutes.

69. Calculate the years required to plate 216 kg of silver onto the cathode when a 96.5 mAmp current is applied to a solution of AgNO3

70. Drill: Calculate the current required to purify 510 kg of aluminum oxide in 5.0 hours

71. Current, Mass, Time Formula:
nFm = MWIt

72. Check HW

73. Test Tuesday

74. Balance the Rxn
KMnO4 + HCl
MnO2 + KClO2

75. Calculate the time required to electroplate 19
Calculate the time required to electroplate 19.7 mg of gold onto a plate by passing 965 mA current through a solution of Au(NO3)3

76. Determine the voltage of a cell with a silver electrode in 5
Determine the voltage of a cell with a silver electrode in 5.0 M AgNO3 & an zinc electrode in 0.25 M ZnCl2 at 27oC

77. Determine the rxn that takes place when 1
Determine the rxn that takes place when 1.0 V is passed through two Pt electrodes in a soln containing NaI(aq) & CoCl2(aq).

78. Calculate the time required to gold plate a 2
Calculate the time required to gold plate a 2.0 mm layer onto a plate (SA = 750 cm2) by passing 965 mA current through a solution of AuCl3 (DAu = 20 g/cm3)

79. Calculate the time required to purify a 204 kg of ore that is 60
Calculate the time required to purify a 204 kg of ore that is 60.0 % Al2O3 by applying a 965 kA current through molten ore sample:

80. Calculate the time required to purify a 32 kg of ore that is 75
Calculate the time required to purify a 32 kg of ore that is 75.0 % Fe2O3 by applying a 9.65 kA current through molten ore sample:

81. A voltaic cell with a silver electrode in 0
A voltaic cell with a silver electrode in 0.10 M Ag+ & a zinc electrode in 1.0 M Zn+2 at 27oC is allowed to react for 5.0 mins at 9.65 A. Calculate: Eo, E, DGo, & mass increase of the cathode.

82. A voltaic cell with a gold electrode in 0
A voltaic cell with a gold electrode in M Au+3 & a zinc electrode in 10.0 M Zn+2 at 27oC is allowed to react for 5.0 hrs at 9.65 A. Calculate: Eo, E, DGo, & mass increase of the cathode.