Exam 17: Electron Transfer Reactions

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You have an abundant supply of NaCl salt from which you would like to prepare pure metallic sodium.

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Calculate the standard free energy change for the following redox reaction: ( Δ\Delta G °\degree = 77.11 (Ag+) and 65.49 kj/mol (Cu+2)2 Ag+ (aq) + Cu (s) \rightarrow 2 Ag (s) + Cu2+ (aq)

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At an engine block rebuilding factory you are in charge of replating Mn on the interiors of engine blocks. Based on the surface area and thickness needed, you determine that you need 35g of Mn to plate out by performing electrolysis on the engine block. Your plating solution is 3 M Mn(NO3)2. How long do you need to perform electrolysis if your machine performs at 220 Amps?

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Which of the following combinations would provide the largest potential for a battery?(If needed, refer to Table 17-1in the text)

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What is the correct description, in line notation, for an electrochemical cell comprised of only Ag wire, AgNO3 electrolyte solution, and a salt bridge having Δ\Delta G = -2 kJ?If needed, use the following equation: Δ\Delta G° = -nFE°, E°  What is the correct description, in line notation, for an electrochemical cell comprised of only Ag wire, AgNO<sub>3</sub> electrolyte solution, and a salt bridge having   \Delta  G = -2 kJ?If needed, use the following equation: \Delta G° = -nFE°, E°   , E = E?  -   , moles e<sup>-</sup> =   (If needed, refer to Table 17-1 in the text ) , E = E? -  What is the correct description, in line notation, for an electrochemical cell comprised of only Ag wire, AgNO<sub>3</sub> electrolyte solution, and a salt bridge having   \Delta  G = -2 kJ?If needed, use the following equation: \Delta G° = -nFE°, E°   , E = E?  -   , moles e<sup>-</sup> =   (If needed, refer to Table 17-1 in the text ) , moles e- =  What is the correct description, in line notation, for an electrochemical cell comprised of only Ag wire, AgNO<sub>3</sub> electrolyte solution, and a salt bridge having   \Delta  G = -2 kJ?If needed, use the following equation: \Delta G° = -nFE°, E°   , E = E?  -   , moles e<sup>-</sup> =   (If needed, refer to Table 17-1 in the text ) (If needed, refer to Table 17-1 in the text )

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You determine that for proper protection of an engine part you need to put a coating of 3.0g of Cr(s) on your part. How long do you need to perform electrolysis on your engine part if your current is 30.0 Amps, and your Cr is in the form of Cr(NO3)3(aq)?

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How is aluminium protected from oxidation?(If needed, refer to Table 17-1in the text)

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Consider the redox reaction of permanganate and sulphur: MnO4- + S \rarr Mn2+ + SO42- (acidic solution)If the coefficient of MnO4- is 6 in the balanced equation, what is the coefficient of H2O?

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For the galvanic cell shown in the diagram, identify the anode and mark which direction the cations are moving in the salt bridge. For the galvanic cell shown in the diagram, identify the anode and mark which direction the cations are moving in the salt bridge.

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Draw three molecular pictures illustrating direct electron transfer in the reaction of silver (I) ions with copper metal.

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For the working galvanic cell shown at standard conditions, how would you increase the cell potential?(If needed, refer to Table 17-1 in the text ) For the working galvanic cell shown at standard conditions, how would you increase the cell potential?(If needed, refer to Table 17-1 in the text )

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Use the half-reaction method to balance the following redox reaction: I2 + S2O32- \rightarrow I - + S4O62- (basic solution)

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Aluminium is used in a battery in which the following reaction occurs: 4 Al (s) + 3 O2 (g) + 4 OH- (aq) + 6 H2O \rightarrow 4 Al(OH) (-,4) (aq)If the battery must supply a current of 78 A for 4.0 hours, what mass of Al (ing) must be contained in the battery?(If needed, refer to Table 17-1 in the text)

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Calculate the equilibrium constant for the following redox reaction: Fe3+ (aq) + Cu+ (aq) \rightarrow Fe2+ (aq) + Cu2+ (aq)[E°(Fe3+, 2+) = 0.771 V] [E°(Cu2+,1+) = 0.153 V](If needed, refer to Table 17-1 in the text)

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For the following galvanic cell what will be its potential when the reaction reaches equilibrium?(If needed, refer to Table 17-1in the text ) For the following galvanic cell what will be its potential when the reaction reaches equilibrium?(If needed, refer to Table 17-1in the text )

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Which of the following is NOT a redox reaction?

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