Pseudo-steady-state-hypothesis PSSH

In this chapter we discuss four topics the pseudo-steady-state hypothesis, polymerization, enzymes, and bioreactors. The pseudo-steady-state hypothesis (PSSH) plays an important role in developing nonelementary rate laws. Consequently, we will first discuss the fundamentals of the PSSH, followed by its use of polymerization reactions and enzymatic reactions. Because enzymes are involved in all living organisms, we close the chapter with a discussion on bioreactions and reactors. 

Using the pseudo-steady-state hypothesis (PSSH), Equations (7-11) and (7-14) can be combined to obtain a rate law for solely in terms of the concentration of azomethane. First we solve for the concentration of the active intermediate AZO in terms of the concentration of azomethane, AZO. Flora the PSSH,... 

These rate laws [Equations (7-3) through (7-5)] are pretty much us in the design of any reaction system because the concentration of the a intermediate AZO is not readily measurable. Consequently, we will ust Pseudo-Steady-State-Hypothesis (PSSH) to obtain a rate law in terms of i surable concentrations. 

Overview. Two of the main threads that tie this chapter together are the pseudo-steady-state-hypothesis (PSSH) and the concept of active intermediates. Active intermediates are highly reactive species that disappear almost as fast as they are formed. As a result, one can use the PSSH that says the net rate of formation of active intermediate is zero. We shall use the PSSH to develop rate laws for chemical reactions that do not follow elementary rate laws and for biological reactions. 

Rate Laws Derived from the Pseudo-Steady-State Hypothesis (PSSH)... 

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