For each of the reactions below, classify as a combination, decomposition, single replacement, or double replacement.
2H2O(l) ⟶ 2H2(g) + 2O2(g)
2Li(s) + 2H2O(l) ⟶ 2LiOH(aq) + H2(g)
The first reaction is a decomposition reaction because it breaks down one compound (H2O) into two simpler substances (H2 and O2).
The second reaction is a single replacement reaction because one element (Li) replaces another element (H) in a compound (H2O).