## reversible vs. irreversible

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

josmit_1D
Posts: 107
Joined: Fri Aug 09, 2019 12:17 am

### reversible vs. irreversible

what indications if the reaction is reversible or not?

Matthew ILG 1L
Posts: 112
Joined: Sat Aug 17, 2019 12:15 am

### Re: reversible vs. irreversible

In a irreversible reaction, the reactants react to form the products, which cannot revert back into reactants. In reversible reactions, as the reactants react with other reactants to form products, the products are reacting with other products to form reactants.
Combustion is an example of an irreversible reaction, as it cannot be undone.

Posts: 104
Joined: Fri Aug 09, 2019 12:16 am

### Re: reversible vs. irreversible

A reversible process is one that can be reversed by an infinitely small change in a variable. For example, if the external pressure is equal to the pressure of the gas in the system, then even an infinitesimal decrease in external pressure will cause the piston to move out (work of expansion) and an infinitely small increase in external pressure will cause the piston to move in. If this is not the case, then the process is not reversible.

Frank He 4G
Posts: 50
Joined: Tue Nov 12, 2019 12:19 am

### Re: reversible vs. irreversible

If you're given a problem, it should say whether it's reversible or irreversible. Otherwise, another method of determining whether a process is reversible is whether the delta S of the universe is 0 or positive. Irreversible processes always have a positive delta S of the universe.