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78. Determine whether each redox reaction occurs spontane- ously in the forward direction. (a) Ca?+ (aq) + Zn(s) (b) 2 Ag*(aq) + Ni(s) → 2 Ag(s) + Ni²*(aq) (c) Fe(s) + Mn²*(aq) (d) 2 Al(s) + 3 Pb²*(aq) Ca(s) + Zn²+(ag) Fe2+ (aq) + Mn(s) 2 Al*(ag) + 3 Pb(s)

78. Determine whether each redox reaction occurs spontane- ously in the forward direction. (a) Ca?+ (aq) + Zn(s) (b) 2 Ag*(aq) + Ni(s) → 2 Ag(s) + Ni²*(aq) (c) Fe(s) + Mn²*(aq) (d) 2 Al(s) + 3 Pb²*(aq) Ca(s) + Zn²+(ag) Fe2+ (aq) + Mn(s) 2 Al*(ag) + 3 Pb(s)

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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78. Determine whether each redox reaction occurs spontane- ously in the forward direction. (a) Ca?+ (b) 2 Ag*(aq) + Ni(s) (c) Fe(s) + Mn²*(aq) (d) 2 Al(s) + 3 Pb²*(aq) Ca(s) + Zn²*(aq) :2+ 2 Ag(s) + Ni²*(aq) (aq) + Zn(s) Fe2+ (aq) + Mn(s) → 2 Al* (aq) + 3 Pb(s) 80. Suppose you wanted to cause Pb-+ ions to come out of so- du lution as solid Pb. What metal could you use to accomplish this? 82. Which metal in the activity series is oxidized with a Ni?+ solution but not with a Cr*solution? 84. Which metals dissolve in HCl? For those metals that do dissolve, write a balanced redox reaction showing what happens when the metal dissolves. (a) Cr (b) РЬ (c) Au (d) Zn 86. Make a sketch of an electrochemical cell with the overall reaction shown here. Label the anode, the cathode, and the salt bridge. Indicate the direction of electron flow. Hint: When drawing electrochemical cells, the anode is usually drawn on the left side.
Transcribed Image Text:78. Determine whether each redox reaction occurs spontane- ously in the forward direction. (a) Ca?+ (b) 2 Ag*(aq) + Ni(s) (c) Fe(s) + Mn²*(aq) (d) 2 Al(s) + 3 Pb²*(aq) Ca(s) + Zn²*(aq) :2+ 2 Ag(s) + Ni²*(aq) (aq) + Zn(s) Fe2+ (aq) + Mn(s) → 2 Al* (aq) + 3 Pb(s) 80. Suppose you wanted to cause Pb-+ ions to come out of so- du lution as solid Pb. What metal could you use to accomplish this? 82. Which metal in the activity series is oxidized with a Ni?+ solution but not with a Cr*solution? 84. Which metals dissolve in HCl? For those metals that do dissolve, write a balanced redox reaction showing what happens when the metal dissolves. (a) Cr (b) РЬ (c) Au (d) Zn 86. Make a sketch of an electrochemical cell with the overall reaction shown here. Label the anode, the cathode, and the salt bridge. Indicate the direction of electron flow. Hint: When drawing electrochemical cells, the anode is usually drawn on the left side.
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