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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: semper erectus on November 24, 2008, 10:41:56 PM

Title: needs help in physical chemitry: kinetics!
Post by: semper erectus on November 24, 2008, 10:41:56 PM

how to determine or calculate the order in kinetics through the given graphs alone?and  how to determine whether the given graphs are 1st,2nd, or 3rd oder? is there any special methods for these things? please reply as soon as possible.
thanks  :rarrow:::) ::) ::) ::) ::) ::) ::) ::)   :larrow:

Title: Re: needs help in physical chemitry: kinetics!
Post by: enahs on November 25, 2008, 10:19:09 PM

It depends on how and what data is ploted.

But it is a safe bet you will some how be calculating the slope of the graph to get vital information.

Title: Re: needs help in physical chemitry: kinetics!
Post by: semper erectus on November 26, 2008, 02:13:59 AM

i already calculated the slope and it gives me positive numbers while the regression was a negative value. the graph was bell shape...can you give me please the  working equation. i know it is simple but i don't any idea!!! please do help me.... thank you!

Title: Re: needs help in physical chemitry: kinetics!
Post by: enahs on November 26, 2008, 10:46:56 PM

I have no idea what kind of graph or data you have. For all I know on the Y-Axis is the number of red jelly beans in a box of jelly beans and the X-Axis is the rate of the reaction of Carbon-13 decay.

And how did you calculate the slope of a bell shaped curve?
You can figure out the derivative of a curve like that, but not a "slope" per say.


Start here I guess:
http://www.chem.purdue.edu/gchelp/howtosolveit/Kinetics/IntegratedRateLaws.html