Is activation energy a constant?

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zricciardulli
Posts: 12
Joined: Wed Sep 30, 2015 3:00 am

Is activation energy a constant?

Postby zricciardulli » Mon Mar 07, 2016 3:45 pm

in other words, would temperature or pressure, etc... Affect the value of activation energy?

Annie Qing 2F
Posts: 28
Joined: Fri Sep 25, 2015 3:00 am

Re: Is activation energy a constant?

Postby Annie Qing 2F » Mon Mar 07, 2016 4:16 pm

External factors like pressure and temperature only affect the reaction rate. They do this by increasing the number/energy of collisions, meaning these collisions reach the activation energy more frequently.
From my understanding, the only thing that affects activation energy is a catalyst.

Hope this helps!

Aishwarya Raich
Posts: 15
Joined: Fri Sep 25, 2015 3:00 am

Re: Is activation energy a constant?

Postby Aishwarya Raich » Mon Mar 07, 2016 4:18 pm

Activation energy of each reaction is a constant. But the conditions of the system can alter the reactions ability to achieve this threshold sooner. For example, increased temperature increases the ability of particles to collide therefore giving a greater kinetic energy and allowing it to achieve its activation energy sooner. Increased pressure would also have a similar effect.

904458260
Posts: 10
Joined: Tue Nov 17, 2015 3:00 am

Re: Is activation energy a constant?

Postby 904458260 » Tue Mar 08, 2016 12:35 pm

The only thing that can change the activation energy is a catalyst. Other properties such as pressure and temperature can speed up the process, but they do so without changing the activation energy.


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