System of choice of leading processes in physical and chemical kinetics

The choice system of leading physical and chemical processes in a gas mixture in a view of a plenty of elementary stages (reactions) is offered. Assuming possible spread of reaction rate constants, the algorithm permits to choose the most important reactions from a plenty of initial elementary stages. Within the limits of given threshold value of goal function the chosen leading reactions adequately describe simulated process. Modeling kinetics of physical and chemical processes at a shock wave in air (for distribution of a shock wave with speed of 9 km/s at height 80 km) leading reactions, adequately describing to concentration of components are allocated.