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Move heterogenous EIN

hello everybody in this video we're gonna start talking about the uh one-dimensional steady state molecular diffusion in case of having a chemical reaction and in this case we will discuss two different uh types of of systems one system that's called the heterogeneous reaction or direction is a heterogeneous reaction and the other is what we call a homogeneous reaction the main difference between homogeneous and heterogeneous reaction is related to the phase in which the reaction takes place if the diffusion is taking place and let's let's take a look at this so this is what we mentioned before about the the the two systems we didn't mention the names of the homogeneous and heterogeneous reactions but we mentioned the concept and this has to do with the phase where the reaction takes place so if the components are diffusing and after the fusion is done and they reach the surface or the interface where their action takes place let's say a surface of a catalyst or something like this then this is a heterogeneous reaction so the reaction is taking place not in the fluid phase but it's taking place in a solid phase which is this interface and this is what we call the heterogeneous reaction so um in in this case the um the reaction is is zero and as we said earlier the reaction is a bounty condition in this case there is another option which is uh the homogeneous reaction which means that the reaction is taking place simultaneously in the same phase where the diffusion is taking place so I have two components they are diffusing from a point to another and while they are diffusing the reaction is taking place and it it it doesn't need to go to this or that doesn't occur at the surface where uh where the the reaction or the diffusion inset so in this case it's called the homogeneous reaction and the rate constant here or the the rate equation is not equal to zero or the red term is not equal to zero so this is this is uh the main difference between a homogeneous and a heterogeneous reaction so um let's see uh the case that we are going to discuss which is the one-dimensional system with chemical reaction so the general continuity equation would be in this form we we just cancel the steady state the unsteady State term and then we have the rate equation it might have any any form and as we said earlier the rate equation is an equation that relates the speed of reaction to the uh the the parameters that affect the reaction mainly the concentration of the reactants sometimes the products the temperature the pressure and any many other parameters some of these parameters will be included here in the K which include mainly the temperature sometimes it includes the other other parameters it includes also the activation energy and there are other parameters included...