The addition of inert gases

for that matter, with the wall as we will see later in this chapter. 

5 Convincing corroborative evidence comes from an experiment using mixtures of cyclopropane and monotritiated cyclopropane there is a small isotope eifect, and the two rates exhibit slightly different fall-olT characteristics when gas is added to a reacting mixture at low pressure, not only is the rate raised to some new value, but the isotopic ratio also reverts to that which would have been observed in the undiluted mixture at the particular pressure which would react at that rate [57.W]. 

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The only term in equation 2.7.1 that is influenced by the addition of inert gases is nr Thus, for reactions in which there is no change in the total number of gaseous moles, addition of inerts has no effect on the equilibrium yield. For cases where there is a change, the effect produced by addition of inert gases is in the same direction as that which would be produced by a pressure decrease. 

LFL, is the lower flammable limit of fuel component i (%vol) Flammability limits can be narrowed by the addition of inert gases such as nitrogen or carbon dioxide. 

Effect of Addition of Inert Diluents. The addition of inert gases to an explosive mixture will have two major effects. It will increase the heat capacity of the mixture, and depending upon the nature of the added gas, it will change the mixture thermal conductivity. Equation 26 shows that an increase in the heat capacity of the mixture will tend to increase the induction period. The addition of a high thermal conductivity gas such as helium will increase the limiting pressure. Rearranging Equation 18 shows that for a given vessel diameter, reactant concentration, and furnace temperature, the ratio... 

The addition of inert gases to a mixture of flammable gases and air affects flammability limits. Carbon dioxide causes a greater... 

Most of the chain reactions show such chemical inhibition, and marked inhibition by trace impurities is excellent evidence for a chain reaction. Thus 0.01 mole per cent of O2 is capable of reducing the quantum yield of the H2 + CI2 reaction by 1000 fold.- In a similar fashion free radicals are easily adsorbed on vessel surfaces, and it is common experience to find that a change in vessel shape, in surface/volume ratio (e.g., that obtained by packing the vessel with glass), or the addition of inert gases such as... 

However, the interesting aspect of the reaction is the production of CH4. It was shown by Schultz and Taylor (loc. cil.) and by many workers. since that the production of CH4 is independent of temperature and of added I2 and is decreased by the addition of inert gases such as Ne, N2, CD4, He, A, and CO2. This is precisely the type of evidence which was shown in the case of the photolysis of HI to support a hot radical... 

In gas phase reactions an increase in the sur-face/volume ratio of the reaction vessel may reduce the reaction rate, while the addition of inert gases may increase the reaction rate (see Section 4.2.5). 

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