* * | The line notation, Pt | H2(g) | H+(aq) || Cu2+(aq) | Cu(s), indicates that | | Selected Answer: | B. Cu2+ is the reducing agent. | Answers: | A. Pt is the cathode. | | B. Cu2+ is the reducing agent. | | C. copper metal is a product of the cell reaction. | | D. hydrogen gas (H2) is a product of the cell reaction. | | E. Cu is the anode. | | * Question 2
2 out of 2 points | | | A voltaic cell is prepared using copper and silver. Its cell notation is shown below. Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s)
Which of the following processes occurs at the cathode? | | | | | Selected Answer: | A. Ag+(aq) + e– → Ag(s) | Answers: | A. Ag+(aq) + e– → Ag(s) | | B. Cu(s) → Cu2+(aq) + 2e– | | C. Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s) | | D. Ag(s) → Ag+(aq) + e– | | E. Cu2+(aq) + 2e– → Cu(s) | | | | | * Question 3
2 out of 2 points | | | A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al3+(aq) || Ni2+(aq) | Ni(s)
Which of the following reactions occurs at the anode? | | | | | Selected Answer: | A. Al(s) → Al3+(aq) + 3e– | Answers: | A. Al(s) → Al3+(aq) + 3e– | | B. Al3+(aq) + 3e → Al(s) | | C. Ni(s) → Ni2+(aq) + 2e– | | D. Ni2+(aq) + 2e– → Ni(s) | | E. none of the above | | | | | * Question 4
2 out of 2 points | | | A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al3+(aq) || Ni2+(aq) | Ni(s)
Which of the following represents the correctly balanced spontaneous reaction equation for the cell? | | | | | Selected Answer: | B. 3Ni2+(aq) + 2Al(s) → 2Al3+(aq) + 3Ni(s) | Answers: | A. Ni2+(aq) + Al(s) → Al3+(aq) + Ni(s) | | B. 3Ni2+(aq) + 2Al(s) → 2Al3+(aq) + 3Ni(s) | | C. Ni(s) + Al3+(aq) → Ni2+(aq) + Al(s) | | D. 3Ni(s) + 2Al3+(aq) → 3Ni2+(aq) + 2Al(s) | | E. none of the above | | | | | * Question 5
2 out of 2 points | | | A voltaic cell prepared using zinc and iodine has the following cell notation. Zn(s) | Zn2+(aq) || I–(aq) | I2(s) | C(graphite)
Which of the following equations correctly represents the balanced, spontaneous, cell reaction? | | | | | Selected Answer: | B. I2(s) + Zn(s) → 2I–(aq) + Zn2+(aq) | Answers: | A. 2I–(aq) + Zn2+(aq) → I2(s) + Zn(s) | | B. I2(s) + Zn(s) → 2I–(aq) + Zn2+(aq) | | C. 2I–(aq) + Zn(s) → I2(s) + Zn2+(aq) | | D. I2(s) + Zn2+(aq) → 2I–(aq) + Zn(s) | | E. None of the above, since graphite must be in the equation. | | | | | * Question 6
2 out of 2 points | | | Which of the following solids is commonly used as an inactive electrode in electrochemical cells? | | | | | Selected Answer: | C. graphite | Answers: | A. copper | | B. sodium | | C. graphite | | D. zinc | | E. iron | | | | | * Question 7
2 out of 2 points | | | Which one of the following statements about electrochemical cells is correct? | | | | | Selected Answer: | C. The anode of a voltaic cell is labeled minus (–). | Answers: | A. In a salt bridge, current is carried by cations moving toward the anode, and anions toward the cathode. | | B. In the external wire, electrons travel from cathode to anode. | | C. The anode of a voltaic cell is labeled minus (–). | | D. Oxidation occurs at the cathode, in an electrolytic cell. | | E. None of the above statements is correct. | | | | | * Question 8
2 out of 2 points | | | Which of the following statements about voltaic and electrolytic cells is correct? | | | | | Selected Answer: | E. The cathode is labeled as positive (+) in a voltaic cell but negative (–) in an electrolytic cell. | Answers: | A. The free energy change, ΔG, is negative for an electrolytic cell. | | B. Oxidation occurs at the cathode only in a voltaic cell. | | C. The electrons in the external wire flow from cathode to anode in both types of cell. | | D. Reduction occurs at the anode in an electrolytic cell. | | E. The cathode is labeled as positive (+) in a voltaic cell but negative (–) in an electrolytic cell. | | | | | * Question 9
2 out of 2 points | | | Which component of the following cell notation is the anode? P | Q || R | S | | | | | Selected Answer: | A. P | Answers: | A. P | | B. Q | | C. R | | D. S | | E. One of the | symbols is the anode. | | | | | * Question 10
2 out of 2 points | | | The line notation, Al(s) | Al3+(aq) || Co2+(aq) | Co(s), indicates that | | | | | Selected Answer: | A. Al is the reducing agent. | Answers: | A. Al is the reducing agent. | | B. Co2+ ions are oxidized. | | C. Co is the reducing agent. | | D. aluminum metal is the cathode. | | E. Al3+ is the reducing agent. | | | | |
Sunday, April 24, 2016 12:48:41 AM EDT