General Chemistry Problems - Classification of Reactions

Classify each of the following reactions as ion-combination, proton transfer, or electron-sharing. All are carried out in aqueous solution.
1. NH₄⁺ + OH^- → NH₃ + H₂O
2. NH₄⁺ + H₂O → H₃O⁺ + NH₃
3. NH₄Cl + AgNO₃ → AgCl + NH₄NO₃
4. NH₄⁺ + NH₂^- → 2 NH₃
5. 2 HCl + Na₂S → H₂S + 2 NaCl
6. 2 CH₃CH₂COOH + S^-2 → H₂S + 2 CH₃CH₂COO^-
7. H⁺ + NH₃ → NH₄⁺
8. Ag⁺ + 2 NH₃ → Ag(NH₃)₂⁺