When does delta U equal zero?

[charlotte_jacobs_4I]

What are the rules for delta U = 0? When does this happen? Under what circumstances?

[aisteles1G]

whenever its stated that a reaction is isothermal (reversible or nonreversible) you can assume that delta U = 0

[Laurence Tacderas 1K]

Since deltaU=3/2nRT, if the reaction is at constant temperature, the internal energy will be equal to zero

[504909207]

When work =0 and it is a adiabetical process, meaning that q=0.

[Letizia Ye 4F]

If the reaction is isothermal, delta U=0.

[Alexandra Albers 1D]

In an isothermal reaction, delta U will be 0. Since this is the case, you will also know that q=-w or w=-q, so you can easily calculate one if you know the other.

[chris_tsai_4H]

When a reaction is isothermal, delta U (internal energy) equals zero.

[amogha_koka3I]

Do we assume isothermal, reversible, and at equilibrium are all synonymous in this class?

[harshitasarambale4I]

I'm not sure if we can equate isothermal to equilibrium.

[maldonadojs]

deltaU=0 when there is a constant temperature, or when temperature is 0. This is because of the equation U=3/2nRT. If constant temperature, Tf-Ti=0. However, if temperature=o, the equation would equal zero instantly.

[Sean_Rodriguez_1J]

I would just like to add that while delta U equals zero in an isothermal process (or in any isolated system), the two have no change in U for different reasons. In an isothermal process, the energy exchanged as heat (q) equals the amount of work done by the system (q = -w) so any heat energy from the process is cancelled out by work, and consequently delta U is 0. In an isolated system, no energy (either as work or as heatI is transferred, so q=0, w=0, and delta U = 0.

[Hadji Yono-Cruz 2L]

In an isothermal reaction then delta U is zero.

[Maya_Peterson1C]

This is for an isothermal reaction. (We can also infer from this that q=-w)

[Shibhon_Shepard]

if the problem states that it is isothermal, q=0 and q=-w, since delta U = q+w, 0+0=0

[Jeannine 1I]

Do we assume isothermal, reversible, and at equilibrium are all synonymous in this class?

I believe that we can assume (for this class) that isothermal also means reversible. I don't think we can assume it's at equilibrium though.

[Casandra]

delta U is equal to zero when the reaction is isothermal, meaning temperature is constant.

[Desiree1G]

When the reactions says it is isothermal that means that the temperature is constant (iso=same). If this is the case then there is no change in the internal energy therefore U is 0.

[LeannaPhan14BDis1D]

When the reaction is isothermal