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3 Questions regarding reaction kinetics please help me out. 
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#1
Jul1014, 08:31 AM

P: 209

Hi I need some help understanding reaction kinetics, and I’m trying to get an overview, so I’d really appreciate some help. I have 3 individual/quite unrelated questions, if you have time to answer one that would be very much appreciated.
1. In what situations dos the Definition of the reaction rate for a general reaction Hold true? aA + Bb > pP+qQ (1/a)*(d[A]/dt)= (1/b)*(d[B]/dt) = (1/p)*(d[P]/dt) = (1/q)*(d[Q]/dt) I would assume this definition only holds true when all the rates are equal, so this does not apply for reactions where the rate of A is different from the rate of B (if this is possible) 2. If the rate of A is slower than the Rate of B, would they then not be comsumed at the same RATE because A would be the limiting factor, the equation (1/a)*(d[A]/dt)= (1/b)*(d[B]/dt) holds true for all reactions? 3. Is it true that if the rate law for A + B > C +D is givn by d[A]/dt = k[A]^n[B]^m with respect to A, then it might be different with repsect to B? So d[B]/dt might be different (slower or faster) than d[A]/dt, so the d[A]/dt=d[B]/dt = k[A]^n*[B]^m only holds true for elementary reactions, while for complex reactions the rate law for d[A]/dt could be equal to k[A][B] raised to a first order while d[B]/dt could be equalt to k[A]^2[B]^1 (something different?) 


#2
Jul1014, 08:46 AM

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#3
Jul1014, 08:55 AM

P: 209

Hi borek, yes i was a bit confused on what question you were answering but now it seems more clear to me: What you are saying is that No matte what reaction we have (Zero order, first order, second order, complex) the equation (1/a)*(d[A]/dt)= (1/b)*(d[B]/dt) = (1/p)*(d[P]/dt) = (1/q)*(d[Q]/dt) is true? and in some cases the rate of any of the reactants might display the following relationship = k[A]^m[B]^n (for complex reactions) and in elementary reactions the orders of the reaction equals the koefficients of the reactants?
If this is a correct understanding, I'm really happy :) 


#4
Jul1014, 08:58 AM

P: 209

3 Questions regarding reaction kinetics please help me out.
Ohh yes an just to make sure it's 100% clear for me:
If (1/a)*d[A]/dt)=k[A]^m[B]^n Then This must also be true (1/b)*(d[B]/dt)=k[A]^m[B]^n :) 


#6
Jul1014, 11:50 AM

P: 209

Thank you very much Borek  Now I'm really happy :D



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