14. Given the following notation for an electrochemical cell which one of the fo

Question

14. Given the following notation for an electrochemical cell which one of the following chan cause an increase in the cell voltage? E"cell 0.34 V Pt(s) H2(1 atm) | H'(1 M) I1 Cu (1 M)I Culs) a. Increase the size/mass of the copper electrode. b. Decrease the concentration of Cu2 ion. c. Increase the size/mass of the platinum electrode. d. Lower the H2(g) pressure. e. Lower the H(aq) concentration. 15. In a voltaic cell, electrons flow spontaneously from the to the a. anode, cathode b. salt bride, anode c. anode, salt bridge d. cathode, anode e. salt bridge, cathode 16. The purpose of the salt bridge in an electrochemical cell is to a. provide a source of ions to react at the anode and cathode. b. provide oxygen to facilitate oxidation at the anode. c. maintain electrical neutrality in the half-cells via migration of ions. d. provide a means for electrons to travel from the anode to the cathode. e. provide a means for electrons to travel from the cathode to the anode 17. What quantity of charge is required to reduce 40.0 g of molten CrCl3 to Cr? a. 2.45 x 104 C b, 2.20 x 105 C c. 9.65 x 104 c d. 731 x 104 ? e, 1.20 x 103 C

Explanation / Answer

14. Option D, lower the concentration of H+ ion, increases the cell voltage. Since Ecell =EOcell - (0.059/2)log(H+/Cu+2)

15. Option A, electrons flow from anode to cathode

16. Option C, to maintain electrical neutrality

17. Option D

Since one mole Cr+3required 3 x 96500 C

40/158.36 mole required = 3x36500x0.25= 7.23 x10*4 C, near to Option D

Approximately 7.3x10*4 C.

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