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What is the cell potential of an electrochemical cell at 298 K with a copper metal electrode immersed in a 0.30 M copper sulfate solution in one compartment and a copper metal electrode immersed in a 1.5 M copper sulfate solution in the other compartment? Cu2+(aq) + 2 e- →\to Cu(s) , What is the cell potential of an electrochemical cell at 298 K with a copper metal electrode immersed in a 0.30 M copper sulfate solution in one compartment and a copper metal electrode immersed in a 1.5 M copper sulfate solution in the other compartment? Cu<sup>2+</sup>(aq) + 2 e<sup>-</sup> \to Cu(s) , = +0.34 V A) +0.34 V B) -0.34 V C) 0.0 V D) +0.68 V E) More information is needed to decide. = +0.34 V


A) "+0.34 V"
B) "-0.34 V"
C) "0.0 V"
D) "+0.68 V"
E) "More information is needed to decide."

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How long would it take to electroplate a flute with 28.3 g of silver at a constant current of 2.00 amps using AgNO3?


A) 105 min
B) 422 min
C) 844 min
D) 211 min
E) 1688 min

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Which of the following statements regarding chemical energy and electrical work is NOT correct?


A) The amount of work available from an electrochemical cell is independent of the amounts of reactants present.
B) The amount of charge transferred in an electrochemical cell is directly proportional to the electrical work the cell performs.
C) When the free energy of an electrochemical cell decreases,the cell potential is positive.
D) The amount of work done by an electrochemical cell depends on the amount of charge transferred.
E) As cell potential increases,the amount of work available increases.

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The work involved in moving exactly 1 mole of electrons through a potential difference of exactly 1 V is ________


A) 1 J.
B) 1 kJ.
C) 96.5 J.
D) 6.02 kJ.
E) 96.5 kJ.

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Silver tarnish (Ag2S) can be removed by immersing silverware in a hot solution of baking soda (NaHCO3) in a pan lined with aluminum foil; however,foul-smelling hydrogen sulfide gas (H2S) is produced.What is Silver tarnish (Ag<sub>2</sub>S) can be removed by immersing silverware in a hot solution of baking soda (NaHCO<sub>3</sub>) in a pan lined with aluminum foil; however,foul-smelling hydrogen sulfide gas (H<sub>2</sub>S) is produced.What is for the redox reaction that occurs? A) +3.512 V B) +1.051 V C) +2.461 V D) +1.521 V E) +0.940 V for the redox reaction that occurs? Silver tarnish (Ag<sub>2</sub>S) can be removed by immersing silverware in a hot solution of baking soda (NaHCO<sub>3</sub>) in a pan lined with aluminum foil; however,foul-smelling hydrogen sulfide gas (H<sub>2</sub>S) is produced.What is for the redox reaction that occurs? A) +3.512 V B) +1.051 V C) +2.461 V D) +1.521 V E) +0.940 V


A) +3.512 V
B) +1.051 V
C) +2.461 V
D) +1.521 V
E) +0.940 V

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In the smelting of iron from iron oxide according to the equation Fe2O3(s) + 3 CO(g) →\to 2 Fe(s) + 3 CO2(g) ,what is the change in oxidation number for iron?


A) "+3"
B) "+2"
C) "0"
D) "-2"
E) "-3"

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For the electrochemical cell based on the reaction of zinc metal with copper(II)ions indicated below where zinc is being oxidized,identify the components labeled as a-e.The anode is on the left; the cathode,on the right.Use the terms zinc nitrate solution,copper nitrate solution,copper electrode,zinc electrode,and salt bridge.Also,label the electrodes as + and -. For the electrochemical cell based on the reaction of zinc metal with copper(II)ions indicated below where zinc is being oxidized,identify the components labeled as a-e.The anode is on the left; the cathode,on the right.Use the terms zinc nitrate solution,copper nitrate solution,copper electrode,zinc electrode,and salt bridge.Also,label the electrodes as + and -.

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(a)zinc electrode; (b)copper e...

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Which statement about a voltaic cell is NOT correct?


A) Usually the cathode is a metal strip.
B) Reduction occurs at the cathode.
C) Electrons are produced at the cathode.
D) In the external circuit,electrons flow toward the cathode.
E) Chemical species can have their oxidation number decreased at the cathode.

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Which statement about a cathode in a voltaic cell is NOT correct?


A) Oxidation occurs at the cathode.
B) Reduction occurs at the cathode.
C) Usually the cathode is a metal strip.
D) In the external circuit,electrons flow toward the cathode.
E) Chemical species can have their oxidation number decreased at the cathode.

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How does a fuel cell differ from a conventional battery?

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A conventional battery has a f...

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Oxidation is the ________


A) gain of electrons.
B) loss of electrons.
C) gain of protons.
D) loss of protons.
E) loss of mass.

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Which of the following statements regarding the polarities and electrode assignments in voltaic and electrolytic cells is correct?


A) The anode and cathode remain the same regardless of whether the cell is voltaic or electrolytic; the difference is that the former releases energy and the latter consumes energy.
B) Electrons flow from the cathode to the anode in a voltaic cell; the electron flow is reversed in an electrolytic cell.
C) In a voltaic cell,the anode is positive and the cathode is negative; the opposite is true in an electrolytic cell (anode -; cathode +) .
D) In a voltaic cell,the anode is negative and the cathode is positive; the opposite is true in an electrolytic cell (anode +; cathode -) .
E) In both types of cells,the anode is positive and the cathode is negative because oxidation happens at the anode and reduction happens at the cathode.

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Balance the chemical equation for the following redox reaction under basic aqueous conditions with the smallest whole-number coefficients possible using the half-reaction method.On which side does OH- appear,and what is its coefficient? ClO3-(aq) + N2H4(g) →\to Cl-(aq) + NO(g)


A) right,2
B) left,4
C) left,1
D) right,3
E) OH- is not required to balance the equation

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Proteins containing a certain functional group (identified as RSH) can be titrated with triiodide ion to produce another functional group (identified as RSSR) .The reaction equation is given below.What is oxidized and what is reduced in this reaction? 2 RSH(aq) + I3-(aq) →\to 3 I-(aq) + RSSR(aq) + 2 H+(aq)


A) RSH is oxidized,I3- is reduced.
B) RSH is reduced,I is oxidized.
C) Both RSH and I are oxidized.
D) Both RSH and I are reduced.
E) This reaction is not oxidation-reduction.

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Aluminum metal is refined in a very energy-intensive process from bauxite ore using the Hall process,which requires electrolysis of aluminum oxide,Al2O3,in molten cryolyte at more than 1012°C.In an industrial electrolysis cell,1900 kg of aluminum oxide was reduced with a current of 1500 amps.How long did it take to reduce all the reactant to aluminum metal?


A) 1.0 ×\times 103 hr
B) 2.0 ×\times 103 hr
C) 330 hr
D) 4.0 ×\times 103 hr
E) 660 hr

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How many kilograms of aluminum metal can be produced by the electrolysis of Al2O3 using a current of 100.0 amps for 24 hours?


A) 0.81
B) 2.4
C) 810
D) 2.2 ×\times 1013
E) 7.5 ×\times 1012

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A voltaic cell is constructed based on the oxidation of zinc metal and the reduction of silver (I) ions.Solutions of 1.00 M silver nitrate and zinc nitrate also were used.The anode is on the left; the cathode,on the right.Locate the zinc nitrate solution on the diagram. A voltaic cell is constructed based on the oxidation of zinc metal and the reduction of silver (I) ions.Solutions of 1.00 M silver nitrate and zinc nitrate also were used.The anode is on the left; the cathode,on the right.Locate the zinc nitrate solution on the diagram. A) a B) b C) c D) d E) e


A) a
B) b
C) c
D) d
E) e

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An electrochemical cell is constructed with a zinc metal anode in contact with a 5.20 ×\times 10-2 M solution of zinc(II) nitrate and a silver cathode in contact with a 4.20 ×\times 10-3 M solution of silver(I) nitrate.What is the emf of this cell at 5°C? An electrochemical cell is constructed with a zinc metal anode in contact with a 5.20 \times 10<sup>-2</sup> M solution of zinc(II) nitrate and a silver cathode in contact with a 4.20 \times 10<sup>-3</sup> M solution of silver(I) nitrate.What is the emf of this cell at 5°C? A) 1.656 V B) 1.609 V C) 1.561 V D) 1.370 V E) 1.458 V


A) 1.656 V
B) 1.609 V
C) 1.561 V
D) 1.370 V
E) 1.458 V

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A 1.5 V alkaline battery is constructed based on a chemical process that involves the transfer of 2 electrons from anode to cathode per reaction.How much work can be done?

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290 kJ of ...

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The spontaneous redox reaction in a voltaic cell has ________


A) The spontaneous redox reaction in a voltaic cell has ________ A) > 0, \Delta G° > 0,and K > 0. B) > 0, \Delta G° < 0,and K < 0. C) > 0, \Delta G° < 0,and K > 0. D) < 0, \Delta G° < 0,and K < 0. E) > 0, \Delta G° = 0,and K > 0. > 0, Δ\Delta G° > 0,and K > 0.
B) The spontaneous redox reaction in a voltaic cell has ________ A) > 0, \Delta G° > 0,and K > 0. B) > 0, \Delta G° < 0,and K < 0. C) > 0, \Delta G° < 0,and K > 0. D) < 0, \Delta G° < 0,and K < 0. E) > 0, \Delta G° = 0,and K > 0. > 0, Δ\Delta G° < 0,and K < 0.
C) The spontaneous redox reaction in a voltaic cell has ________ A) > 0, \Delta G° > 0,and K > 0. B) > 0, \Delta G° < 0,and K < 0. C) > 0, \Delta G° < 0,and K > 0. D) < 0, \Delta G° < 0,and K < 0. E) > 0, \Delta G° = 0,and K > 0. > 0, Δ\Delta G° < 0,and K > 0.
D) The spontaneous redox reaction in a voltaic cell has ________ A) > 0, \Delta G° > 0,and K > 0. B) > 0, \Delta G° < 0,and K < 0. C) > 0, \Delta G° < 0,and K > 0. D) < 0, \Delta G° < 0,and K < 0. E) > 0, \Delta G° = 0,and K > 0. < 0, Δ\Delta G° < 0,and K < 0.
E) The spontaneous redox reaction in a voltaic cell has ________ A) > 0, \Delta G° > 0,and K > 0. B) > 0, \Delta G° < 0,and K < 0. C) > 0, \Delta G° < 0,and K > 0. D) < 0, \Delta G° < 0,and K < 0. E) > 0, \Delta G° = 0,and K > 0. > 0, Δ\Delta G° = 0,and K > 0.

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