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score at the top of the assignment. Be sure to refresh question score after each submission. Identify the battery that uses each of the following half-reactions: Half-reaction Battery HW18 ... 7 of 9 12/14/08 3:10 AM
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Ag 2 O + H 2 O + 2e 1- -> 2Ag + 2OH 1- Button Button 2MnO 2 + H 2 O + 2e 1- -> Mn 2 O 3 + 2OH 1- Dry cell Dry cell Pb + SO 4 2- -> PbSO 4 + 2e 1- Automobile Automobile 8. 0.55/0.55 points | 1/5 submissions No Marks. To determine what portion of the question you have correct, click on question score at the top of the assignment. Be sure to refresh question score after each submission. Indicate whether each reaction could form the basis of a galvanic cell or require an electrolytic cell to be accomplished. Reactants Cell Type Zn + Ni 2+ -> Zn 2+ + Ni Galvanic Galvanic 2H 2 O -> 2H 2 + O 2 Electrolytic Electrolytic 2Na + Cl 2 -> 2NaCl Galvanic Galvanic 9. 0.6/0.6 points | 1/5 submissions Automobile bodies contain significant amounts of iron. The iron is protected by the addition of zinc. This is called galvanization, the protection of one metal the sacrifice of a more reactive metal. Write the balanced chemical equations using smallest whole number coefficients for the following processes: Use complete reactions with molecules and atoms; i.e., no ions or half-reactions. For example, 2Na + Cl2 -> 2NaCl. HW18 ... 8 of 9 12/14/08 3:10 AM
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The corrosion that is prevented by galvanization. 4Fe + 3O2 -> 2Fe2O3 4Fe + 3O2 -> 2Fe2O3 -or- 3O2 + 4Fe -> 2Fe2O3 The galvanization reaction that occurs instead of the above corrosion. 2Zn + O2 -> 2ZnO 2Zn + O2 -> 2ZnO -or- O2 + 2Zn -> 2ZnO HW18 ... 9 of 9 12/14/08 3:10 AM
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