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study state approximation

study state approximation

Grade:12th Pass

2 Answers

Aravind Bommera
36 Points
8 years ago

Many reactions which seem to be quite simple are indeed very complex. The
reactions proceed in different steps. In such stepwise complex reactions, the
overall reaction rate is determined by the slowest step among different steps.
Various intermediate or unstable species are produced in different steps. Thus, a
nstable
reaction involving many steps will lead to complex equations. In order to express
the overall rate of a complex reaction in terms of the individual rate constants, a
special treatment is required. In simple procedure, the intermediates such as the
atoms and free radicals, the concentrations of which are necessarily low, are
assumed to have a constant concentration during the course of reaction.
According to steady – state treatment, it may be assumed that the rate of
formation of intermediate is equal to to its rate of disappearance, or
This way, simple expressions for the concentration of intermediates can be
obtained and hence an equation for the overall rate can be derived.

Jeevan Rao
32 Points
8 years ago

In chemistry, a steady state is a situation in which all state variables are constant in spite of ongoing processes that strive to change them. For an entire system to be at steady state, i.e. for all state variables of a system to be constant, there must be a flow through the system (compare mass balance). One of the most simple examples of such a system is the case of a bathtub with the tap open but without the bottom plug: after a certain time the water flows in and out at the same rate, so the water level (the state variable being Volume) stabilizes and the system is at steady state.

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