Identify each of these reactions as either synthesis, decomposition, single replacement, or double replacement.

1.) Pb(NO³)₂ + 2KI ----> 2KNO³ + PbI₂
2.) S + O₂ ----> SO₂
3.) BaCl₂ ----> Ba + CI₂
4.) Cl₂ + 2NaBr ----> 2NaCI + Br₂
5.) 2Fe₂O³ + 3C ----> 4Fe + 3CO₂​