The electrocheical reaction which powers a lead-acid storage battery is as follo

Question

The electrocheical reaction which powers a lead-acid storage battery is as follows:

Pb(s) + PbO2(s) + 4H+(aq) + 2SO4^2-(aq) -> 2PbSO4(s) + 2H20(l)

A single cell of this battery consists of a Pb electrode and a PbO2 electrode, each submerged in sulfuric acid. What reaction occurs at the cathode during discharge?

A) Pb(s) is reduced to PbSO4

B) PbO2(s) is reduced to PbSO4

C) PbO2 is oxidized to PbSO4(s)

D) Pb(s) is oxidized to PbSO4(s)

9) For a cell reaction:

2MnO4-(aq) + 5H2SO3(aq)<-> 2Mn2+(aq) + 5SO4^2-(aq)+4H+(aq) 3H2O(l)

the standard cell potential is 1.34V. Which change(s) will result in an increase in the cell potential?
1. increasing the permanganate-ion concentration

2. decreasing the pH

3. increasing the sulfurous acid concentration

11)what half reaction occurs at the cathode during the electrolysis of molten potassium bromide?

a) 2BR-(l) -> Br2(l) +2e-

C) K+(l)- ->K(s)

D) K(s) -> K+(l) +e-

E) 2H2O(l) +2e- -> H2(g) + 2 OH-(l)

Explanation / Answer

8.

B) PbO2(s) is reduced to PbSO4

9.

2. decreasing the pH

11.

D) K(s) -> K+(l) +e-

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