Changes in Systems

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Jessica Helfond 2F
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Joined: Fri Sep 28, 2018 12:16 am

Changes in Systems

Postby Jessica Helfond 2F » Fri Jan 11, 2019 7:31 pm

In lecture, Lavelle's slides said for changes in pressure, K does not change, whereas for changes in temperature, K does change. Was this just an example or is this always the case? If it's always the case, why does K change for temperature and not pressure?

Xuan Kuang 2L
Posts: 31
Joined: Wed Nov 14, 2018 12:23 am

Re: Changes in Systems

Postby Xuan Kuang 2L » Fri Jan 11, 2019 7:46 pm

I believe that this is always the case. There is an equation relating the temperature to K that may help you understand why, and you can see the full derivation of it in the textbook (For me, it is in 5H, pg 413, not sure about the 6th edition)

Hop this helps

Chem_Mod
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Re: Changes in Systems

Postby Chem_Mod » Fri Jan 11, 2019 11:55 pm

Changing the pressure/volume of a reaction does not change the equilibrium constant but changing the temperature ALWAYS changes the equilibrium constant. This is becasue an equilibrium is in essence, a ratio of the rate constant of the forward reaction over the rate constant of the reverse reaction. These rate constant are dependent on temperature (but not a pressure of volume).

Ana Pedreros
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: Changes in Systems

Postby Ana Pedreros » Sat Jan 12, 2019 2:02 pm

If temperature changes the equilibrium constant, then can Q be compared to K?


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