q rev

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connie 2C
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Joined: Thu Jul 11, 2019 12:17 am

q rev

Postby connie 2C » Sun Feb 09, 2020 10:21 pm

how do you know when the system is reversible?

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Re: q rev

Postby sbeall_1C » Sun Feb 09, 2020 10:23 pm

A system undergoes reversible expansion when the change is made with infinitesimal changes to pressure. In a irreversible expansion, the change cannot be undone, and the reaction proceeds with a constant external pressure.

Juliet Stephenson 4E
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Joined: Wed Sep 18, 2019 12:21 am

Re: q rev

Postby Juliet Stephenson 4E » Sun Feb 09, 2020 10:33 pm

A process is reversible if the system maintains thermodynamic equilibrium with its surroundings throughout the whole process. Reversible processes are less common than irreversible processes, and a perfectly reversible process is not possible.

Amy Xiao 1I
Posts: 101
Joined: Sat Jul 20, 2019 12:15 am

Re: q rev

Postby Amy Xiao 1I » Sun Feb 09, 2020 10:39 pm

In terms of homework or test problems, they will most likely tell you explicitly that the system is being changed reversibly.

Eugene Chung 3F
Posts: 142
Joined: Wed Nov 15, 2017 3:03 am

Re: q rev

Postby Eugene Chung 3F » Sun Feb 09, 2020 10:57 pm

In reality, all natural (real) processes are irreversible because biochemical systems often use highly irreversible rxns to speed up processes. Also, all spontaneous processes are irreversible. (like hot going to cold) Reversible reactions are the "ideal" and "perfect" system. (ex in class: perfect heat engine) and all heat can be converted to work. To answer your question then, the question should explicitly say that the reaction is reversible. This normally is worded with isothermal, meaning constant T, because T is constant along the pathway for reversible reactions.

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