Ca + O2 = , Cao, Al+Cl2=, AlCl3, MgO+H2O=, Mg(OH)2, P4+O2=, P4O10, CO2+H2O=, H2CO3, SO2+H2O=, H2SO3, H2+S=, H2S, H2+Br2=, HBr, K+O2=, K2O.

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