5 For each of the reactions below write the oxidation and re

5) For each of the reactions below, write the oxidation and reduction half reactions, including electrons a) Zn + Cl2 ZnClz oxidation half reaction: reduction half reaction b) oxidation half reaction: reduction half reaction:

Solution

Oxidation reaction

Zn(s) = Zn2+(aq) + 2e-

Reduction reaction

2Cl-(aq) + 2e- = Cl2

Zn + Cl2 = ZnCl2

Zn is oxidized from 0 to +2

Cl is reduced from 0 to - 1

Part b

Oxidation reaction

Al = Al3+ + 3e-

Reduction reaction

3Ag+ + 3e- = 3Ag

Overall reaction

Al + 3Ag+ = 3Ag+ + Al3+