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Reversible vs Irreversible

Posted: Sat Feb 09, 2019 3:02 pm
by Linh Vo 2J
Is there a way to tell whether to use a reversible, isothermal equation or an irreversible equation to represent work?

Re: Reversible vs Irreversible

Posted: Sat Feb 09, 2019 3:17 pm
by Chloe Qiao 4C
It depends on the conditions that the problem gives. For example, if the question states that there is infinitesimal changes, use the reversible equation. When the change is too large(cannot by reversed by an infinitesimal change), then use the irreversible equation.

Re: Reversible vs Irreversible

Posted: Sat Feb 09, 2019 6:30 pm
by Ryan Troutman 4L
Only the problem can tell exactly which type of reaction it is without calculating delta G (Gibbs free energy). If there are many many changes (as stated by Chloe) then reversible is the way to go, however if it is sudden and drops quickly then it is irreversible.

Re: Reversible vs Irreversible

Posted: Sun Feb 10, 2019 1:11 pm
by Michael Novelo 4G
Usually it'll be given but the biggest difference has to do with the amount of pressure and if it changes "infinitesimal" Its a reversible process if the pressure is being slightly changed like 1 millionth less compared to the pressure of the system. If the pressure change is a large number then it's irreversible.

Re: Reversible vs Irreversible

Posted: Sun Feb 10, 2019 11:08 pm
by Michelle Nwufo 2G
Which of the reactions requires you to take the integral of the change in volume when calculating work?

Re: Reversible vs Irreversible

Posted: Sun Feb 10, 2019 11:11 pm
by Samantha Kwock 1D
The equation for isothermal, reversible reactions is derived from taking the integral of the change in volume.

Re: Reversible vs Irreversible

Posted: Mon Feb 11, 2019 12:01 am
by sonalivij
Michelle Nwufo 2G wrote:Which of the reactions requires you to take the integral of the change in volume when calculating work?


The equation for an isothermal reversible expansion/compression requires you to take the integral of the change in volume when calculating work

Re: Reversible vs Irreversible

Posted: Mon Feb 11, 2019 9:07 am
by Katelyn Phan 2A
Usually it would be told whether or not the system is reversible or irreversible.

Re: Reversible vs Irreversible

Posted: Mon Feb 11, 2019 10:09 am
by Kaylee Kang 1G
The starting conditions should help you determine whether the reaction is reversible or irreversible.

Re: Reversible vs Irreversible

Posted: Mon Feb 11, 2019 10:18 am
by Jonathan Pai 2I
irreversable needs to occur slowly for heat to equal out and pressure

Re: Reversible vs Irreversible

Posted: Mon Feb 11, 2019 11:39 am
by Toru Fiberesima 1L
W for reversible isothermal expansion of an ideal gas W=-nRTln(V2/V1)