Physics Forums

Physics Forums (http://www.physicsforums.com/index.php)
-   Chemistry (http://www.physicsforums.com/forumdisplay.php?f=83)
-   -   Activation Energy (http://www.physicsforums.com/showthread.php?t=77654)

garytse86 Jun1-05 04:47 PM

Activation Energy
 
Is activation energy dependent?

I think it isn't, but if you rearrange the Arrhenius equation you get:
Ea - activation energy
Ea = RT(lnA - lnk)
so as temperature Ea can change. But I am thinking that k will also change in relation so Ea is constant?

gravenewworld Jun2-05 04:04 PM

Ea is temp. independent, K will change with a change in T. So if T changes the -lnK factor will change so Ea will always be constant. A classical chemistry experiment at universities is plotting lnK vs. 1/T. The rate of the reaction at different temperatures is recorded in the lab. From the straight line in plot of lnk vs 1/T you can calculate the slope and the slope is equal to Ea/R.

garytse86 Jun3-05 04:29 AM

ok thanks very much.


All times are GMT -5. The time now is 09:03 PM.

Powered by vBulletin Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
© 2014 Physics Forums