The order of chemical reactions

In a steady-state process, a gas is absorbed in a liquid with which it undergoes an irreversible reaction. The mass transfer process is governed by Fick s law, and the liquid is sufficiently deep for it to be regarded as effectively infinite in depth. On increasing the temperature, the concentration of reactant at the liquid surface CAi falls to 0.8 times its original value. The diffusivity is unchanged, but the reaction constant increases by a factor of 1.35. It is found that the mass transfer rate at the liquid surface falls to 0.83 times its original value. What is the order of the chemical reaction ... 

We will indicate the order of the chemical reaction with a subscript, so k2 is the rale constant of a second-order reaction. 

The overall order of the chemical reaction in the reaction zone is determined from the Sg data. This overall reaction order, m, is correlated with the pressure exponent of burning rate, n, as described in Section 3.5 ... 

Assuming that the order of the chemical reaction is one, the flux (F2) of the reactant gaseous species consumed on the substrate surface through the heterogeneous reactions is represented by... 

In the same way, and as was foreseen in section 2.1.1, the process of dissolution may alter both the rate and the order of the chemical reaction. For this reason it is possible to use the solvent as a tool both to speed up and to slow down the development of a chemical process. 

A precise formulation of chemical similarity would require considering the order of the chemical reaction(s) involved. 

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