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Electrochemical Cells

Electrochemical Cells. Spontaneous Redox Reaction - Zn + Cu 2+. Zn (s) + Cu 2+ (aq) Zn 2+ (aq) + Cu (s). Non-Spontaneous Redox Reaction - Water. 2 H 2 O (l) 2 H 2 (g) + O 2 (g). Battery Construction - Zn + Cu 2+. Zn|Zn 2+ ||Cu 2+ |Cu. Volta’s Pile.

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Electrochemical Cells

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  1. Electrochemical Cells

  2. Spontaneous Redox Reaction - Zn + Cu2+ Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s)

  3. Non-Spontaneous Redox Reaction - Water 2 H2O(l) 2 H2(g) + O2(g)

  4. Battery Construction - Zn + Cu2+ Zn|Zn2+||Cu2+|Cu

  5. Volta’s Pile

  6. Commercial Cells - Le Clanche (Dry) Cell Zn | Zn2+, NH4Cl, MnO2 | C Zn + 2 MnO2 + 2 NH4+ Mn2O3 + 2 NH3 + H2O + Zn2+

  7. Commercial Cells - Lead Storage Battery Pb(s) | PbSO4(s) | H2SO4(aq) | PbSO4(s) | PbO2(s) | Pb(s) Pb + PbO2 + 2 H2SO4 2 PbSO4 + 2 H2O

  8. Commercial Cells - Nickel-Cadmium Battery Zn | ZnO2 | OH- | Hg | HgO Zn + HgO ZnO + Hg

  9. Battery Connections Series Connection Parallel Connection

  10. Historical Origin of Sign Convention

  11. Cell Conventions

  12. Standard Hydrogen Electrode (SHE) SHE || Cathode Pt(s) | H2(g,f=1) | H+(aq,a=1) || Cathode

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