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Postby lizettelopez1F » Sat Mar 02, 2019 6:52 pm

What is the difference between instantaneous rate, average rate, and unique rate?

Toru Fiberesima 1L
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Joined: Fri Apr 06, 2018 11:02 am

Re: Kinetics

Postby Toru Fiberesima 1L » Sat Mar 02, 2019 7:14 pm

The average rate is obtained by taking the slope of the line connecting any two points on the curve during that period. Ie amount of change/time taken.

The instantaneous rate is obtained by taking the slope of the line tangent to the curve at a given time (t). The instantaneous rate is essentially the average rate as t approaches zero.

Ariel Cheng 2I
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Joined: Fri Sep 28, 2018 12:29 am

Re: Kinetics

Postby Ariel Cheng 2I » Sun Mar 03, 2019 11:29 am

When you are looking at a chemical reaction, the rate at which each reactant and product is changing might be different from one another. A unique rate would be the rate of change for any species in a chemical reaction divided by its stoichiometric coefficient. Unique rates should be the same for each reactant and product.

Alma Flores 1D
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Joined: Wed Nov 08, 2017 3:01 am

Re: Kinetics

Postby Alma Flores 1D » Sun Mar 03, 2019 4:41 pm

The average rate is the average instantaneous reaction rate over a period of time during the reaction. The average rate of reaction can be calculated for any time interval. The instantaneous rate is the rate at a particular instant of time during the reaction represented by the instantaneous slope of the curve at that point.

-average rate = (conc(t2) − conc(t1))/(t2 −t1) = ∆conc/∆t
-instantaneous rate = −(d[R])/dt or instantaneous rate = (d[P])/dt
-unique rate = −1/a (d[A])/dt = 1/b (d[B])/dt = 1/c (d[C])/dt

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