BTW Fred, have you given some thought to our enthalpy vs gibbs controversy? Which energy can be recovered from the reaction below do you think, the enthalpy change or the gibbs free eneregy change?
Michel ----- Original Message ----- From: "Frederick Sparber" <[EMAIL PROTECTED]> To: "vortex-l" <[email protected]> Sent: Friday, June 02, 2006 4:52 PM Subject: Re: Free Radical Chain Reactions > Actually 2 H2 + O2 ----> 2 H2O has about 14 reaction steps. > > http://www.cheresources.com/reactionkinetics3.shtml > > "Another important consideration is the formation of chain reactions. The > basic premise of chain reaction mechanisms is also that free radicals play > a leading role in the destruction of reactant molecules. The chain > reaction mechanism itself consists of several steps: initiation, > propagation, branching (not always present), and termination. This can be > illustrated, for certain range of temperature and pressure, by some of the > reactions in the following Hydrogen oxidation mechanism:" > > "To summarize, reaction mechanisms can be assembled from elementary > reactions using free radicals as the means for decomposition of the > reactant, and intermediate products. Chain branching reactions, if they > occur, take a very important role in the mechanism as they lead to the > formation of increasing concentrations of radicals. Reaction time and > temperature have a bearing on radical concentration, and the type of > reaction initiating the consumption of the reactant"
