Isothermal Reversible


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Kyra Dingle 1B
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Isothermal Reversible

Postby Kyra Dingle 1B » Sun Jan 28, 2018 9:28 pm

When a problem mentions that an entropy change occurred isothermally do we assume that the process was also reversible? Why or why not?

Minie 1G
Posts: 63
Joined: Fri Sep 29, 2017 7:04 am

Re: Isothermal Reversible

Postby Minie 1G » Sun Jan 28, 2018 9:50 pm

not all isothermal reactions are reversible.

for a thermodynamic process to be reversible, it must maintain equilibrium with its surroundings at all instances. So, the process must progress slowly without acceleration.

The expansion of an ideal gas into a vacuum is isothermal. It is expanding into empty space so there is no opposing force, and thus no work done by the gas while expanding. But if we want to get the system back to its original state, we have to work on it to push it back and have the vacuum part again. We have to change the surroundings.

However, reversible processes are isothermal.

Jason Liu 1C
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

Re: Isothermal Reversible

Postby Jason Liu 1C » Sun Jan 28, 2018 9:54 pm

Are irreversible reactions isothermal as well? Does a change in temperature make a reaction not reversible?

Emily Oren 3C
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

Re: Isothermal Reversible

Postby Emily Oren 3C » Sun Jan 28, 2018 10:03 pm

Yes, a change in temperature makes the reaction not reversible because all reversible reactions are isothermal. However, it is also possible to have an irreversible isothermal reaction.

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