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Practice determining reaction classification

For each of the reactions below, classify as a combination, decomposition, single replacement, or double replacement.

$Ca(s)+C{l}_2(g)longrightarrowCaC{l}_2(s)$

$2Cu(s)+O_2(g)2$CuO$(s)$

$Ca(N{O}_3{)}_2(ag)+H_{2}S{O}_4(ag)2HN{O}_3(ag)+CaS{O}_4(s)$

$N{H}_3(ag)+HCl(aq)N{H}_{4}Cl(ag)$

$Hg(N{O}_3{)}_2(ag)+2$NaI$(ag)Hg{l}_2(s)+2NaN{O}_3(ag)$

$AgN{O}_3(ag)+$NaCl$(ag)$AgCl$(s)+NaN{O}_3(ag)$

$H_{2}C{O}_3(ag)C{O}_2(g)+H_{2}O(I)$

$2H_{2}O(l)2H_2(g)+2O_2(g)$