Part of PC-07 — Redox Reactions & Electrochemistry

Fill in the Blanks — Electrochemistry Practice

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Complete the following with correct answers:

  1. Oxidation is loss of ______; reduction is gain of ______. [electrons; electrons]

  2. The electrode potential is measured against the ______ electrode, which has E° = ______ V. [Standard Hydrogen Electrode (SHE); 0.00]

  3. E°cell = E°______ − E°______. [cathode; anode]

  4. The Nernst equation at 25°C: E = E° − (______/n) log Q. [0.0592]

  5. At equilibrium, E = ______ and Q = ______. [0; K]

  6. ΔG\Delta G° = −______. Therefore, if E°cell > 0, then ΔG\Delta G° is ______. [nFE°; negative]

  7. Faraday's law: w = ______/(nF). [MIt]

  8. 1 Faraday = ______ C = charge of ______ moles of electrons. [96500 (or 96485); 1]

  9. In a galvanic cell, the anode is the ______ terminal (sign), and electrons flow to the ______. [negative (−); cathode]

  10. In an electrolytic cell, the anode is the ______ terminal. [positive (+)]

  11. Molar conductivity Λm = κ × ______/M. [1000]

  12. For weak electrolytes, degree of dissociation α = Λm/______. [Λ°m]

  13. Kohlrausch's law: Λ°m = ______ λ°₊ + ______ λ°₋. [ν₊; ν₋]

  14. For strong electrolytes, Λm ______ (increases/decreases) slightly on dilution. [increases]

  15. Corrosion product rust = ______. The anodic half-reaction: ______. [Fe2O3Fe_{2}O_{3}·xH2OH_{2}O; Fe → Fe2+Fe^{2+} + 2ee^{-}]

  16. The battery with constant voltage used in hearing aids is the ______ cell (EMF = ______ V). [mercury; 1.35]

  17. The lead storage battery has ______ cells connected in series, giving ______ V total. [6; 12]

  18. An H2H_{2}-O2O_{2} fuel cell has efficiency of ~%, compared to ~% for combustion engines. [70; 40]

  19. In galvanization, iron is coated with ______ to prevent corrosion. Even when scratched, ______ acts as sacrificial anode. [zinc (Zn); zinc (Zn)]

  20. The oxidation number of O in OF2OF_{2} is ______ (not −2). [+2]

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