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Unique Rate

Posted: Sat Mar 03, 2018 12:13 pm
by 104922499 1F
Can someone clarify what unique rate laws are? I did not understand what Lavelle said during class about this. Thanks!

Re: Unique Rate

Posted: Sat Mar 03, 2018 12:49 pm
by Sabrina Dunbar 1I
The unique rate is the instantaneous rate of change at any time t during the reaction. Unlike the average rate, which takes into account all of the times at which the reaction proceeds and averages it, the instantaneous rate is specific to a time and therefore it generates a different k value. The general equation used for the unique rate can be written as rate=d[R]/dt while the average rate is rate=∆concentration/∆t. Unique rate laws are specific to each reaction and are confined to a specific time.

Re: Unique Rate

Posted: Sat Mar 03, 2018 1:37 pm
by Alvin Tran 2E
In addition, when you calculate the unique rate, it is the same for all the reactants and products involved in the reaction.

Re: Unique Rate  [ENDORSED]

Posted: Sat Mar 03, 2018 2:37 pm
by Angela G 2K
For a reaction aA + bB -> cC + dD, where the lowercase letters are the stoichiometric coefficients and the uppercase letters are chemical species, the unique rate law is


This rate law is unique to the reaction and the same for all reactants and products in this reaction.

Re: Unique Rate

Posted: Thu Mar 15, 2018 8:14 pm
by 104922499 1F
thanks!

Re: Unique Rate

Posted: Sat Mar 17, 2018 1:09 am
by Connie2I
Is there a way to know when exactly we should be using unique rate?