Diamond

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Andres Merlos 2L
Posts: 46
Joined: Wed Sep 18, 2019 12:17 am

Diamond

Postby Andres Merlos 2L » Sun Mar 01, 2020 5:49 pm

Why is it that diamond is kinetically stable and controlled with respect to graphite if the reaction for this to happens takes so long under STP? Is it because it is quicker, relative to graphite?

Kimberly Koo 2I
Posts: 99
Joined: Sat Aug 17, 2019 12:17 am

Re: Diamond

Postby Kimberly Koo 2I » Sun Mar 01, 2020 6:22 pm

Diamond is kinetically stable with respect to graphite because the path for diamond becoming graphite has a larger activation energy barrier that makes the diamond less ready to transition to graphite, so diamond is kinetically stable.

005162520
Posts: 101
Joined: Tue Sep 24, 2019 12:17 am

Re: Diamond

Postby 005162520 » Sun Mar 01, 2020 10:48 pm

What do you mean by large activation energy barrier ? If it has a large activation energy barrier does that mean the reaction takes longer ?

DanielTalebzadehShoushtari2A
Posts: 53
Joined: Fri Aug 02, 2019 12:16 am

Re: Diamond

Postby DanielTalebzadehShoushtari2A » Sun Mar 01, 2020 11:05 pm

Graphite is thermodynamically more stable than diamond, because it has less total energy. However, the process needed to get from diamond to graphite has a large activation energy (where the "energy barrier" comes from). So, the reaction proceeds so slowly that diamond is said to be stable (kinetically).

Nare Nazaryan 1F
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: Diamond

Postby Nare Nazaryan 1F » Sun Mar 01, 2020 11:31 pm

005162520 wrote:What do you mean by large activation energy barrier ? If it has a large activation energy barrier does that mean the reaction takes longer ?

Yes, it takes much longer since it is a lot slower (and usually we don't see diamond rings for example turning to graphite)

Caroline Zepecki
Posts: 101
Joined: Fri Aug 09, 2019 12:16 am

Re: Diamond

Postby Caroline Zepecki » Sun Mar 08, 2020 10:34 am

Over a very very long period of time graphite will turn to diamond, but graphite is in its more stable energy form. It has a super high activation energy/energy barrier though

Jasmine Vallarta 2L
Posts: 102
Joined: Sat Aug 17, 2019 12:18 am

Re: Diamond

Postby Jasmine Vallarta 2L » Sun Mar 08, 2020 10:53 am

diamond --> graphite has a very very large activation energy


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