Question 1
Shown below are the reactions occurring in the proton-exchange membrane (PEM) fuel cell.
| I. | 2 H2(g) → 4 H+(aq) + 4 e- |
| II. | O2(g) + 4 H+(aq) + 4 e- → 2 H2O(l) |
| Overall | 2 H2(g) + O2(g) → 2 H2O(l) |
Which is the cathode reaction, and what is being oxidized in the overall reaction?
◦ I, O
2◦ II, O
2◦ I, H
2◦ II, H
2Question 2
Which of the following statements concerning the rusting of iron is
false?
◦ Salt increases the rate of corrosion by providing ions to carry the current.
◦ The oxidation site can occur at a different place on the metal surface than the reduction site.
◦ The rusting of iron requires both oxygen and water.
◦ The metal is reduced.
Banded iron formations
Iron Deficiency Symptoms
Iron deficiency anemia blood cells.
Matthew Ritchie, three stills from The Iron City.
Iron metabolism.