1) 2H2 + O2 = 2H2O
2) Ca + Cl2 = CaCl2
3) H2 + S = H2S
4) 4Al + 3O2 = 2Al2O3
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Answers & Comments
1) 2H2 + O2 = 2H2O
2) Ca + Cl2 = CaCl2
3) H2 + S = H2S
4) 4Al + 3O2 = 2Al2O3