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+2PH3=2NH3+2P;
N2+2AsH3=2NH3+2As;
3O2+4NH3=放电=2N2+6H2O.
yO2 + 4CxHy =(不完全)燃烧= 2yH2O + 4xC