急急
急Ca+2HCl=CaCl2+H2 ↑ N2+3Ca=Ca3N2 3C+CaO=CaC2+CO ↑ CO2+Ca(OH)2(过量)=CaCO3↓+H2O2CO2(过量)+Ca(OH)2=Ca(HCO3)2SO2+Ca(OH)2===CaSO3+H2OSO3+Ca(OH)2=CaSO4↓+H2OCa+2H2O====Ca(OH)2+H2↑