A UPDATES AVAILABLE Do you want to install the updates now? Table 2 Half-Reaction Standard Reduction Potential, E (V) [Zn(OH),]- + 2 e Zn + 4 OH -1.20 Zn(OH), + 2e- → Zn + 2 OH -1.25 HgO + H2O + 2 e Hg + 20H +0.10 O2 + 2 H20 + 4e +4OH +0.40 Pacemakers are electronic devices that help regulate the heart rate. Currently, lithium-iodine cells are commonly used to power pacemakers and have replaced zinc-mercury cells. Table 1 provides the operating cell potential, E, for each cell. Table 2 provides the standard reduction potentials for several half-reactions related to zinc-mercury and zinc-air cells. The use of zinc-mercury cells in hearing aids has been replaced by zinc-air cells that operate using the oxidation of Zn by O, from the air, generating a potential of +1.60 V. Table 2 provides the standard reduction potentials for the half-reactions used in zinc-mercury and zinc-air cells. Which of the following best explains the modification to the cell design that is mostly responsible for the difference in standard cell potentials for zinc-mercury and zinc-air cells? The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the thermodynamically more favorable reduction of O, compared to A HgO. The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the greater number of moles of e required to reduce O, compared to в HgO. The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the thermodynamically less favorable reduction of O, compared to HgO. The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the greater number of moles of hydroxide ions required to reduce D [Zn(OH),- compared to Zn(OH),.

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Using standard reduction potentials from the ALEKS Data tab, calculate the standard reaction free energy AG for the following redox reaction. Be sure your answer has the correct number of significant digits. 2+ 3+ Mn²+ (aq) + 2H₂O (1) +2Fe³+ (aq) → MnO₂ (s) + 4H* (aq) +2Fe²+ (aq) kJ x10 [:] OL A பா

Calculate Ecell (volts) for the galvanic cell containing the reaction shown below where the concentration of the ion at the anode is 0.500 M and the concentration of the ion at the cathode is 1.50 M. Use the standard reduction potentials from Appendix L in our textbook.

Calculate Ecel (volts) for the galvanic cell containing the reaction shown below where the concentration of the ion at the anode is 0.793 M and the concentration of the ion at the cathode is 1.90 M. Use the standard reduction potentials from Appendix L in our textbook. Np + Lu³* » Lu + Np3*

Consider these two entries from a fictional table of standard reduction potentials X+ (aq) + e - Y+ (aq) + e Y(s) O X and Y X and Y+ X and Y X and Y+ X(s) - E = 2.46 V Which pair of species will react under standard conditions at 25 °C? E = 1.25 V

Based on standard reduction potentials (in second table below), will each of these reactions (in table 1) take place? How to calculate this?

4. Name EXPERIMENT 12 ELECTROCHEMISTRY: GALVANIC CELLS Electrodes Use the table of standard reduction potentials from your textbook to complete the following table. The zinc-copper Daniell cell is given as an example. Cu Cu Zn Zn Zn Cu Zn Mg Cu Mg Conc. of Each Cation 1.0 M Zn²+ 0.5 M Cu²+ 1.0 M Zn²+ 0.1 M Cu²+ Date 1.0 M Zn²+ Zn²+ + 2e-Zn (ag) Half-Reactions A. Determine the E for the Standard Zn-Cu Galvanic Cell Zn²+ (aq) 1.0 M Cu²+ Cu²+ +2e-Cu Cathode B. Determine the E* for the Cu-Zn Cell at Non-standard Concentrations 1.0 M Zn²+ Anode + 2e → Zn Instructor Cu²+2e-Cu Zn²+ + 2e → Zn (aq) Report Sheet Cathode or Anode? Anode E E (table) (calcd) -0.76 V +0.34 V -0.76V Cathode 0.34 v anode 0.76v Cathode 0.34 v Cu²+ + 2e - Cul C. Determine the E for Zn-Mg and Cu-Mg Galvanic Cells Zn(aq) +2e Zn (s) cathode -0.76 1.0 M Mg²+Mga+2e Mg(s) anode -2.38 +1.10 V 1.10 V 1.0 M Cu²+ +Ze Cu(s) Cathode 40.34 v 2+ +2e 1.0 M Mg²+ M Mg(s) anode -2.38v "You must use the Nernst equation to calculate this…

Using standard reduction potentials from the ALEKS Data tab, calculate the standard reaction free energy delta G^0  for the following redox reaction. I2(s) + 6H2O(l) + 5 Cl2(g) -> 2IO3-(aq) + 12H+(aq) + 10Cl-(aq)Be sure your answer has the correct number of significant digits.

Which one of the following reactions will occur spontaneously under standard conditions (and 25°C) ? You should consult a table of Standard Reduction Potentials 3Ag + A1³+→ 3Ag+ + Al 2A13+ + 3Fe → 2Al + 3Fe2+ Cu + 2H+ Cu²+ + H₂ 3Mg2+ + 2Cr→ 3Mg + 2Cr³+ Mg2+ + Ca → Mg + Ca²+