Chemical kinetics, factors affecting activation energy
My sample paper says activation energy is affected by:
* surface area of the reactants
* physical state
* temperature
* catalyst
13 Replies
@Dexter
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+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.i disagree with surface area and temperature
surface area doesn't change the reaction itself right
and in arrhenius equation activation energy is fixed and thus independent of temperature
catalyst i agree
physical state i'm not sure
am i correct or nah
we'll wait for someone to confirm for surface area
For temperature, note that many questions tell you to "assume" activation energy is constant for all temperature when using the arhenius quation
ah 💀
nice catch thanku
hang on
a higher temperature means that energy is being supplied for the reaction right
it doesn't mean that the reaction itself requires less energy, just that the energy is available in the environment
nvm im confusing heat with temperature
the temp. dependency makes sense
I dont know which book you can refer, but im pretty sure Ea changes with larger temperature changes
yus google pe kuch mil jayega
i think surface area one is thoda galat....like it doesnt directly affect ea but if the medium is let's say sold and gas ya solid and liq then a larger surface area exposes more ractive sites which can indirectly influence how rxn proceeds.
and won't it be independent of temp..like it doesn't change ea itself just the fraction of molecules that have enough energy to react.
(correct me if im wrong )
Surface area ke baare mein kuch toh concept that surface chemistry mei
More the surface area, more reaction sites are available for reaction to take place
Hence it is recommended to take reactants in the powdered form
(if we consider key and lock mechanism as an illustration)
yeh i used the same reasoning
atp we're getting into the definition of activation energy, and whether it means the amount of energy required or the extra amount of energy required that it doesn't already have
if its the first option, Ea is temperature independent and if its the second option, Ea is temperature dependent
It's extra amount of energy
So, Ea is temperature dependent
ahh
this is nice thank you, explains everything
+solved prachi1308 isoham itsav23 "Flame Tests Lover"
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