System states, liquid phase chemical specification

There is no doubt that liquid systems represent the majority of chemical work and that all biochemical processes require solvent water for their functionality. At the same time it is clear that the liquid state with a density like a solid but a mobility comparable to the gas phase is the most difficult one for theory. Although classical model systems based on electrostatic and van der Waals forces can provide some insight into the physicochemical behavior of liquids and solutions, specific properties of species formed in a pure liquid or by a solute with the solvent require a more sophisticated approach, which is often attempted by quantum mechanical (QM) calculations of model systems. Such model calculations supply information, however, for an isolated system in the gas... 

S.S. Cherry et al, Identification of Important Chemical Reactions in Liquid Propellant Rocket Engines , Pyrodynamics 6 (3—4), 275—96 (1969) CA 70,. 98394 (1969) [The authors state that the kinetics of nonequilibrium expansion of the propint system N204/A-50 (UDMH 49 plus hydrazine 51 wt%) can be described by the following gas phase reactions with an accuracy such that not more than 0.5 lb force-sec/lb mass variation in specific impulse (at a nozzle expansion rate of 40) is produced, as compared to the results of a full kinetic analysis ... 

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