1. The “Zebra” cell was invented in 1985 in South Africa as part of the “ZEolite

Question

1. The “Zebra” cell was invented in 1985 in South Africa as part of the “ZEolite Battery Research Africa” project, and is used in all-electric municipal buses and other vehicles. It uses nickel and molten sodium as its electrodes. Its overall cell reaction is

NiCl2(l) + 2Na(l) <--> Ni(s) + 2NaCl(l)

a)              Write the two half-reactions for this battery.

b)             Calculate the Eo for the Zebra cell (show your work).

c)              Are the reactants in this battery at room temperature when it is operating? Explain how you know.

2. Concrete used in road construction is reinforced using steel bars in a grid, known collectively as “rebar.” After many years, rebar will begin to corrode, and the concrete will weaken. Studies are ongoing regarding the best metal to be a sacrificial anode to prevent corrosion of the rebar. Which would work better for the purpose, magnesium or zinc? Explain your answer based on the oxidation potentials for each metal.

3. How many grams of iron can be produced (plated out) by applying a 3.65 amp current for 87.0 minutes to a solution containing Fe3+ ions? What is the minimum voltage that must be applied for this for this to work? How do you know?

Explanation / Answer

1. The “Zebra” cell was invented in 1985 in South Africa as part of the “ZEolite

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