Numerous textbooks on the thermodynamics of non-equilibrium processes consider in a thermodynamic manner only those systems which are close to thermodynamic equilibrium. Unfortunately, this restriction does not allow a consideration of the actually interesting reactive systems of either a chemical or biological nature. This book covers the application of simple approaches of non-equilibrium thermodynamics to analyzing the properties of chemically reactive systems which are not only close to thermodynamic equilibrium but also far from equilibrium. The latter extension is suggested for the first time and allows the consideration of most chemically reactive systems of practical interest. Moreover, it is shown that the approach allows the resolution of many complicated problems in teaching chemical kinetics. Also, a reasonable extension is given for analyzing the operating catalytic systems.