Question 4.11: WRITING HALF-REACTIONS Write unbalanced half-reactions for t...

WRITING HALF-REACTIONS

Write unbalanced half-reactions for the following net ionic equations:

(a) Mn^{2+}(aq)  +  ClO_{3}^{-}(aq)  →  MnO_{2}(s)  +  ClO_{2}(aq)

(b) Cr_{2}O_{7}^{2-}(aq)  +  Fe^{2+}(aq)  →  Cr^{3+}(aq)  +  Fe^{3+}(aq)

STRATEGY
Look at each equation to see which atoms are being oxidized (increasing in oxidation number) and which are being reduced (decreasing in oxidation number).