INTRODUCTION In a previous paper1 a microcanonical ensemble of reacting pairs of molecules in bimolecular reactions was considered and a quasiequilibrium assumed between the pairs and activated complexes moving in a positive direction along the reaction coordinate. As noted previously, this microcanonical version of activated complex theory is related to the usual version by means of a Laplace ...

Thermodynamics of extraction of Zn2+ from sulfuric acid media contacting to a mixture of DEHPA and MEHPA diluted with 80 wt% aromatic-aliphatic kerosene with a constant DEHPA to MEHPA ratio is investigated at different acidities, concentrations and temperatures. As a result, the extraction reaction is found to be endothermic with a zinc distribution factor that increases with increasing of the ...

The validity of the Arrhenius equation for dissociative electron attachment rate coefficients is investigated. A general analysis allows us to obtain estimates of the upper temperature bound for the range of validity of the Arrhenius equation in the endothermic case and both lower and upper bounds in the exothermic case with a reaction barrier. The results of the general discussion are illustra...

The thermodynamics of interaction of two model peptides melittin and mastoparan with bovine brain calmodulin (CAM) and a smaller CAM analogue, a calcium binding protein from Entamoeba histolytica (CaBP) in 10 mM MOPS buffer (pH 7.0) was examined using isothermal titration calorimetry (ITC). These data show that CAM binds to both the peptides and the enthalpy of binding is endothermic for melitt...

The thermal decomposition of alunite and of mixtures of alunite with dickite or quartz or both has been studied, and X-ray determinations of the products at various stages of the decomposition have been made. Between 6oo and 7oo ~ the product from alunite is a mixture of anhydrous alum and amorphous alumina; between 7oo and 770 ~ the anhydrous alum breaks down into aluminium sulphate and alkali...

The Direction of a Reaction Suppose we have a reaction such as A + B ↔ C , which has come to equilibrium at some temperature τ . Now we raise the temperature. Does the equilibrium shift to the left (more A and B) or to the right (more C)? The heat of reaction at constant pressure, Qp, is the heat that must be supplied to the system if the reaction goes from left to right. If Qp > 0, heat is abs...

Nickel titanium (NiTi) foams were made by combustion synthesis of powders with the help of ZrH2 as foaming agent and TiB2 as endothermic agent. In this paper, we investigated the effect of elemental powder size on the foaming. The powder size of Ni and Ti affected the ignition temperature of the combustion reaction, cell morphology and microstructure of the foams. The cell morphology of the foa...