Chapter 19 electrochemistry worksheet 4. When the following oxidation–reduction reaction in acidic solution is balanced, what is the lowest whole-number coefficient for H+, and on which side of the balanced equation should it appear? Cr2O72–(aq) + CH2O(aq)  Cr3+(aq) + HCOOH(aq) A) 1, reactant side B) 2, product side C) 6, product side D) 8, reactant side E) 14, reactant side 9. Which of the following statements is true for a voltaic (galvanic) cell? A) The electron flow is from the positive electrode to the negative electrode. B) The electron flow is from the anode to the cathode. C) The electron flow is from the oxidizing agent to the reducing agent through an external circuit. D) The electron flow is from the negative cathode to the positive anode. E) The electron flow is through the salt bridge. 12. A lead storage battery involves the following two half-reactions: + 2e– Pb(s) + SO42–(aq); = V E° → –0.36 PbO2(s) + 4H+(aq) + SO42–(aq) + 2e– PbSO4(s) + 2H2O(l); = 1.69 V E° → During the discharge reaction of the lead storage battery at 1.0 concentrations, the M cell potential and the reducing agent are, respectively, A) V and Pb. –2.05 B) V and PbO2. –2.05 C) 2.05 V and Pb. D) 2.05 V and PbO2. E) 1.33 V and Pb. 19. Which reaction would be most likely to occur at the anode of a voltaic cell? A) 2H2O(l)  2H2(g) + O2(g) B) + 2e– Pb(s) + SO42–(aq) 
Chapter 19 electrochemistry worksheet 4. When the following oxidation–reduction reaction in acidic solution is balanced, what is the lowest whole-number coefficient for H+, and on which side of the balanced equation should it appear? Cr2O72–(aq) + CH2O(aq)  Cr3+(aq) + HCOOH(aq) A) 1, reactant side B) 2, product side C) 6, product side D) 8, reactant side E) 14, reactant side 9. Which of the following statements is true for a voltaic (galvanic) cell? A) The electron flow is from the positive electrode to the negative electrode. B) The electron flow is from the anode to the cathode. C) The electron flow is from the oxidizing agent to the reducing agent through an external circuit. D) The electron flow is from the negative cathode to the positive anode. E) The electron flow is through the salt bridge. 12. A lead storage battery involves the following two half-reactions: + 2e– → Pb(s) + SO42–(aq); E° = –0.36 V PbO2(s) + 4H+(aq) + SO42–(aq) + 2e– → PbSO4(s) + 2H2O(l); E° = 1.69 V During the discharge reaction of the lead storage battery at 1.0 M concentrations, the cell potential and the reducing agent are, respectively, A) –2.05 V and Pb. B) –2.05 V and PbO2. C) 2.05 V and Pb. D) 2.05 V and PbO2. E) 1.33 V and Pb. 19. Which reaction would be most likely to occur at the anode of a voltaic cell? A) 2H2O(l)  2H2(g) + O2(g) B) + 2e–  Pb(s) + SO42–(aq)