Classify each of the following reactions as combination, decomposition, single replacement, or double replacement: a) CuO(s)+2HCl(aq)-->CuCl2(aq)+H2O(l); b) 2Al(s)+3Br2(g)-->2AlBr3(s); c)Pb(NO3)2(aq)+2NaCl(aq)-->PbCl2(s)+2NaNO3(aq); d)2Mg(s)+O2(g)-->2MgO(s)