Delta U


Moderators: Chem_Mod, Chem_Admin

Ellis Song 4I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Delta U

Postby Ellis Song 4I » Tue Feb 11, 2020 8:29 pm

What exactly is ? I know it means internal energy but I'm not sure what that means.

DarrenKim_1H
Posts: 123
Joined: Fri Sep 20, 2019 12:17 am
Been upvoted: 1 time

Re: Delta U

Postby DarrenKim_1H » Tue Feb 11, 2020 8:31 pm

It refers to the energy contained within a system

DarrenKim_1H
Posts: 123
Joined: Fri Sep 20, 2019 12:17 am
Been upvoted: 1 time

Re: Delta U

Postby DarrenKim_1H » Tue Feb 11, 2020 8:32 pm

So basically, U = q + w refers to the fact that it is the total energy that the system is involved with, i.e the energy from the heat generated or loss plus the energy of the work done on or against the system

805097738
Posts: 180
Joined: Wed Sep 18, 2019 12:20 am

Re: Delta U

Postby 805097738 » Tue Feb 11, 2020 9:49 pm

this is the internal energy of the system. so w would be the work either done by or on the system and q would be the heat either absorbed or given off by the system. the changes are looked at in the perspective of the system

Subashni Rajiv 1K
Posts: 101
Joined: Wed Sep 18, 2019 12:16 am

Re: Delta U

Postby Subashni Rajiv 1K » Tue Feb 11, 2020 10:24 pm

When solving for internal energy, it is helpful to keep track of the terms given in relation to the system and not the surroundings.

Jainam Shah 4I
Posts: 130
Joined: Fri Aug 30, 2019 12:16 am

Re: Delta U

Postby Jainam Shah 4I » Tue Feb 11, 2020 11:04 pm

Delta U is basically the internal energy of the system. When a system is isolated the delta U cannot change. Delta U changes by an input of energy via heat transfer or work due to compression/expansion.

Dina Marchenko 2J
Posts: 54
Joined: Thu Jul 25, 2019 12:16 am

Re: Delta U

Postby Dina Marchenko 2J » Sat Feb 15, 2020 6:03 pm

It's important to remember than delta U is the change in internal energy rather than just the internal energy of a system. It's a state function that looks at how the internal energy of a system changes over the course of a process (if a system releases or absorbs energy).

Rebekah Alfred 1J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am
Been upvoted: 1 time

Re: Delta U

Postby Rebekah Alfred 1J » Sat Feb 15, 2020 7:31 pm

Changes in internal energy are a function of initial and final states. When delta U is zero, a gas still can expand because it is a spontaneous process with an entropy increase.

805383532
Posts: 53
Joined: Thu Jul 11, 2019 12:16 am

Re: Delta U

Postby 805383532 » Sun Feb 16, 2020 8:07 pm

Delta U is the change in internal energy. Internal energy is the energy contained within a system.


Return to “Concepts & Calculations Using First Law of Thermodynamics”

Who is online

Users browsing this forum: No registered users and 0 guests