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Unformatted text preview: Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Write the overall cell reaction for the galvanic cell given below. Pt( s ) v H 2 ( g ) v H + ( aq ) vv Cl 2 ( g ) v Cl- ( aq ) v Pt( s ) A) 2 H + ( aq ) + 2 Cl 2 ( g ) 2 HCl( aq ) B) H 2 ( g ) + Cl 2 ( aq ) 2 H + ( aq ) + 2 Cl- ( g ) C) Pt( s ) + H 2 ( g ) + Cl- ( aq ) Pt( s ) + 2 H + ( aq ) + 2 Cl 2 ( g ) D) No reaction would occur because there is no salt bridge. 1) 2) What is the balanced chemical equation for the galvanic cell reaction expressed using shorthand notation below? Al( s ) v Al 3+ ( aq ) vv Zn 2+ ( aq ) v Zn( s ) A) 2 Zn( s ) + 3 Al 3+ ( aq ) 2 Zn 2+ ( aq ) + 3 Al( s ) B) 2 Al( s ) + 3 Zn 2+ ( aq ) 2 Al 3+ ( aq ) + 3 Zn( s ) C) 3 Al( s ) + 2 Zn 2+ ( aq ) 3 Al 3+ ( aq ) + 2 Zn( s ) D) 3 Zn( s ) + 2 Al 3+ ( aq ) 3 Zn 2+ ( aq ) + 2 Al( s ) 2) Shown below is a galvanic cell with anode compartment b containing anode a and cathode compartment d containing cathode c. Electrons flow through wire f, ions flow through salt bridge e, and the cell potential is read using voltmeter g. This galvanic cell uses the reaction: Cu( s ) + 2 Ag + ( aq ) 2 Ag( s ) + Cu 2+ ( aq ). 3) If the concentrations of Ag + ( aq ) and Cu 2+ ( aq ) are varied in this galvanic cell, which of the following four cells has the largest cell potential? A) [Ag + ] = 1.0 M and [Cu 2+ ] = 1.0 M B) [Ag + ] = 0.10 M and [Cu 2+ ] = 0.10 M C) [Ag + ] = 1.0 M and [Cu 2+ ] = 0.10 M D) [Ag + ] = 0.10 M and [Cu 2+ ] = 1.0 M 3) 1 4) The Hall-Heroult process for the production of aluminum involves the electrolysis of A) a molten mixture of Al 2 O 3 and Na 3 AlF 6 ....
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