1) A galvanic cell is constructed with the following two elements and their ions, what is Eo for the net reaction of the oxidation of Mg(s) and the reduction of Pb (s)? a) -2.48 V b) 2.22 V c) -2.2 V d) 0.31 V 2) what is the term for a device that allows ions to travel between two half-cells to maintain an ionic charge balance in each compartment?  a) salt bridge b) reduction half cell c) oxidation half-cell  d) electrochemical cell  3) rust tends to form when iron comes in contact with water. according to the reaction, what happens at the cathode region? a) oxygen is being reduced b) iron is being reduced c) oxygen is being oxidized d) iron is being oxidized 4) how many e- are gained or lost in the half-reaction? Na+-> Na a) 1 e is gained b) 1/2 e is lost c) 1/2 e is gained d) 1 e is lost 5) Electrons in a galvanic cell normally flow a) from cathode to anode. b) from anode to cathode. c) through a porous barrier. d) in both directions through an external circuit. 6) As a metal corrodes, what happens to oxygen? a) It is reduced. b) It is oxidized. c) It turns into a metal. d) No changes occur. 7) Which of the following best describes the electrochemical reactions of corrosion when iron is placed in moist air? a) Iron is reduced. b) Salts dissolved in water are the cathode, and iron is the anode. c) Oxygen and water form hydroxide ions that undergo oxidation. d) Oxygen and water form hydroxide ions at the cathode, and the iron becomes iron ions at the anode. 8) From the values given in the table, which metal is most likely to be oxidized? a) Zn b) Ag c) Pb d) Cu 9) determine which of the following would protect iron best. a) Zn b) Ag c) Pb d) Cu 10) Use the table to determine the E0 for the reduction half-reaction that occurs in the cell Zn|Zn2+||Cu2+|Cu a) 0.7618 V b) -0.3419 V c) +0.3419 V d) +0.7618 V 11) Which type of voltaic cell uses a carbon rod as the cathode? a) 12 V car battery b) alkaline dry cell c) zinc dry cell d) mercury battery 12) The following pair of half-reactions occurs in an electrochemical cell, Where does the silver half-reaction take place? a) at the anode b) at the cathode c) in the salt bridge d) on the wire 13) What is the E0cell for the cell Al|Al3+||Au3+|Au? a) +0.24 V b) –0.24 V c) –3.08 V d) +3.08 V 14) What is the 0 Ecell for the cell Li|Li+||Ni2+|Ni? a) 0 V b) -2.81 V c) +2.81 V d) -3.27 V 15) Which of the following is not true of a fuel cell? a) Water is a by-product of the reaction. b) Electricity is required to produce a chemical reaction c) Reactants are continuously supplied and products are continuously removed d) It acts as a voltaic cell.removed 16) What is the anode half-reaction for the cell Cu(s)|Cu2+(aq)||Ag+(aq)|Ag(s)? a) Cu(s) -> Cu2+(aq) + 2e- b) Cu2+(aq) + 2e- -> Cu(s) c) Ag+ (aq) + e- -> Ag(s) d) Ag(s) -> Ag+ (aq) + e- 17) The half-reaction in a voltaic cell that has the more negative standard reduction potential will be a) the anode. b) the cathode. c) indicating electron loss. d) Both (b) and (c) 18) Which occurs in a car’s battery as the engine is started? a) Energy of motion is converted to energy in the form of heat. b) Chemical energy is converted to energy of motion. c) Chemical energy is converted to electrical energy. d) Electrical energy is converted to chemical energy. 19) When a copper half-cell is coupled with a standard hydrogen electrode a) electrons will flow from the hydrogen electrode to the copper electrode b) electrons will flow from the copper electrode to the hydrogen electrode c) the voltage measured between the two electrodes will be negative. d) the hydrogen electrode will act as a cathode.

electrochemistry

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