Reversible vs. Irreversible  [ENDORSED]

isochoric/isometric:
isothermal:
isobaric:

Moderators: Chem_Mod, Chem_Admin

Jocelyn_Dao_2N
Posts: 18
Joined: Wed Sep 21, 2016 2:58 pm

Reversible vs. Irreversible

Postby Jocelyn_Dao_2N » Sat Feb 11, 2017 6:34 pm

What do the terms "reversible" and "irreversible" indicate about a reaction? And how do each affect calculations?

Paul Sedaros 1B
Posts: 23
Joined: Fri Sep 25, 2015 3:00 am

Re: Reversible vs. Irreversible  [ENDORSED]

Postby Paul Sedaros 1B » Sat Feb 11, 2017 6:47 pm

A reversible reaction occurs when reactants form products and the products (with the aid of reactant(s)) is able to revert back to the reactants (both chemical reactions can occur, for example let's say O2+2H2->2H2O is reversible, water can be separated to form oxygen gas and hydrogen gas and vice versa). In an irreversible reaction, the reaction only goes in one direction (say the same example given above was irreversible, water could not convert back into O2 gas and H2 gas.

Jocelyn_Dao_2N
Posts: 18
Joined: Wed Sep 21, 2016 2:58 pm

Re: Reversible vs. Irreversible

Postby Jocelyn_Dao_2N » Sun Feb 12, 2017 10:06 pm

Okay thanks! That helps clarify things, but I was also wondering how each condition affects one's calculations for a certain reaction? And how it affects the temperature, pressure, etc

204751840 2E
Posts: 19
Joined: Tue Oct 04, 2016 3:00 am

Re: Reversible vs. Irreversible

Postby 204751840 2E » Wed Feb 15, 2017 12:30 am

Two things that whether or not a system is reversible can affect is entropy and work done on the environment. In the case of a reversible process, Delta S system = -Delta S surrondings. This is not the case with an irreversible process.

Molika Soben_3J
Posts: 27
Joined: Wed Sep 21, 2016 3:00 pm

Re: Reversible vs. Irreversible

Postby Molika Soben_3J » Wed Feb 15, 2017 1:27 pm

For the calculations for work, it is affected in the formulas for irreversible expansion and reversible expansion. For irreversible expansion, work is equal to negative pressure times delta V while reversible expansion is equal to negative nRT times the natural log of V2 over V1.


Return to “Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)”

Who is online

Users browsing this forum: No registered users and 1 guest