O2+2H2S=2H2O+S↓;C+H2O=高温=CO+H2↑ ;2F2+2H2O=4HF+O2;2Cl2+2Ca(OH)2=2CaCl2+2H2O+O2↑;F2+2HCl=2HF+Cl2;Cl2+2NaBr=2NaCl+Br2;Br2+2KI=2KBr+I2;S+2KI=K2S+I2;S+K2Se=K2S+Se;Se+K2Te=K2Se+Te;2N2+3CH4=4NH3+3C;N2+2...