Question

How do I start? I don't know how to approach the problem and so there's no way I can solve for any of them. Any help is appreciated.

Advanced Study: Pre-Laboratory Assignment As a review, in the following equations for familiar reactions, write an R over the reducing agent and arn O over the oxidizing agent. At the right, indicate the change in oxidation number per atom for each element whose oxidation number changes. If there is no change in oxidation number, write NC. Onidation Oaidation sumbar Element Increase Elemeatdecrease Reaction oxidized par atom reduced par stom Mg(s) + 2 H. → Mg2+ + H2(g) Cu2+ + H2S(g) → CuS(s) + 2 H. Bals) + 2 H2O → Ba2+ + 2 OH. + HAs) 3 Narods) + Crofs) + H2O → 6 Na. + 2 CrO--+ 20H co2(g) + C(s) → 2 CO(g) HCI(g) + NH(g) → NH,CI(s) 22nSS) + 302(g) → 2 ZnO(s) + 2 SO2(g) 10 H' + SO.2 . + 81→412(s) + H2S(g) + 4H,o