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ELECTROCHEMISTRY REVIEW SHEET 1. Assign oxidation numbers to the atoms within the following compounds. a. KMnO4 K: _____ Mn: _____ O: _____ b. NaClO2 Na: _____ Cl: _____ O: _____ c. NH4+ N: _____ H: _____ d. Zn(CN)2 Zn: _____ C: _____ N: _____ 2. Draw the setup for the given cell diagram in the space below. Label the anode and cathode and draw the direction of electron flow and ion flow. Where does oxidation occur? Where does reduction occur? Use equations to exemplify. Voltaic: Fe (s) | Fe2(SO4)3 (aq) || MnSO4 (aq) | Mn (s), E˚ = 1.632 V 3. Redraw the above cell, changing it to an electrolytic cell. Label the anode and cathode and draw the direction of electron flow and ion flow. Where does oxidation occur? Where does reduction occur? Use equations to exemplify. 4. Draw cell diagrams for the following voltaic cell half – reactions. a. Mo3+ (aq) + 3 e– → Mo (s) b. Pb (s) → Pb2+ (aq) + 2 e– 2+ – Ni (s) → Ni (aq) + 2 e Po4+ (aq) + 4 e– → Po (s) 5. Balance these equations using the half – reaction method, identify the species being oxidized and reduced, and identify the oxidizing agent and reducing agent. a. Aqueous potassium permanganate reacts with solid nickel in the presence of hydrochloric acid to synthesize manganese (IV) oxide and several other products. b. H3AsO4 (l) + Ag (s) + HOCN (aq) → HAsO2 (l) + AgOCN (aq) + H2O (l) 6. Calculate the standard cell potential and Gibb’s Free Energy for the reactions in number 5. Are the reactions spontaneous or nonspontaneous? Which would need to be placed in an electrolytic cell to work? a. b. 7. A __________ dry cell is used in C and D batteries that are used in flashlights. Smaller electronic devices require _______________ batteries like AA and AAA batteries. Hearing aids, calculators and camera flashes require even smaller batteries like _______________ batteries. In __________ __________, the reactants are continuously supplied and products are continuously removed. The final product of the hydrogen fuel cell is __________. 8. Describe how a key could be gold plated. 9. Describe how a AA or AAA rechargeable battery works. 10. Using the Nernst Equation, calculate the cell potential using the given information. a. Ga (s) | GaCl3 (0.10 M) || HgCl2 (0.050 M) | Hg (l) b. 2 Md(ClO3)3 (aq) + 2 NH4OH (l) → 2 Md (s) + N2 (g) + 2 H2O (l) + 6 HClO3 (aq) [Md(ClO3)3] = 0.055 M, [HClO3] = 0.010 M, [NH4OH] = 0.100 M.