sign of entropy

Volume:
Temperature:

Moderators: Chem_Mod, Chem_Admin

Jack Papciak 2F
Posts: 31
Joined: Fri Sep 29, 2017 7:06 am

sign of entropy

Postby Jack Papciak 2F » Mon Jan 29, 2018 4:26 pm

How do I know whether the entropy has a "+" or a "-"?

Grace Boyd 2F
Posts: 50
Joined: Thu Jul 27, 2017 3:01 am

Re: sign of entropy

Postby Grace Boyd 2F » Mon Jan 29, 2018 4:29 pm

As Dr. Lavelle explained today in lecture, the sign of entropy depends on the direction of heat flow. If the system loses heat, the entropy will have a negative sign in front of it. If the surroundings gain heat, the entropy will have a positive sign. I hope this helps!

Alyssa Pelak 1J
Posts: 72
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

Re: sign of entropy

Postby Alyssa Pelak 1J » Mon Jan 29, 2018 6:00 pm

Additionally, entropy is positive when the reaction spontaneous. It means that the system has more possible states. Entropy is negative when the system has less possible states.

Lauren Seidl 1D
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

Re: sign of entropy

Postby Lauren Seidl 1D » Mon Jan 29, 2018 7:45 pm

Also, if delta entropy equals zero then the reaction is at equilibrium.

Leanne Wong 1H
Posts: 50
Joined: Tue Oct 10, 2017 7:13 am
Been upvoted: 1 time

Re: sign of entropy

Postby Leanne Wong 1H » Wed Jan 31, 2018 4:26 am

You determine the sign of entropy by the direction of heat flow.

RohanGupta1G
Posts: 34
Joined: Sat Jul 22, 2017 3:00 am

Re: sign of entropy

Postby RohanGupta1G » Wed Jan 31, 2018 8:43 am

Direction of heat flow determines the sign as well as whether or not the reaction is spontaneous.

Jingyi Li 2C
Posts: 56
Joined: Fri Sep 29, 2017 7:06 am

Re: sign of entropy

Postby Jingyi Li 2C » Wed Jan 31, 2018 10:25 am

The sign of entropy indicates the direction of heat flow.

Amanda Wu 2C
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

Re: sign of entropy

Postby Amanda Wu 2C » Wed Jan 31, 2018 3:59 pm

The sign of entropy is indicative of the heat flow in or out of the system. A system in which heat flows out to the surroundings will have a negative entropy whereas a system in which heat flows in from the surroundings will have a positive entropy.

Josh Moy 1H
Posts: 58
Joined: Thu Jul 13, 2017 3:00 am

Re: sign of entropy

Postby Josh Moy 1H » Wed Jan 31, 2018 10:21 pm

sign of entropy depends on flow of heat

melissa carey 1f
Posts: 53
Joined: Fri Sep 29, 2017 7:06 am

Re: sign of entropy

Postby melissa carey 1f » Thu Feb 01, 2018 2:06 pm

Additionally, during a process of expansion entropy increases as there are more possible states.

JamesAntonios 1E
Posts: 70
Joined: Fri Sep 29, 2017 7:04 am

Re: sign of entropy

Postby JamesAntonios 1E » Thu Feb 01, 2018 2:12 pm

Jack Papciak 2F wrote:How do I know whether the entropy has a "+" or a "-"?


It depends on the the ratio of final to initial temperature, volume, and/or pressure. You can logically think about by analyzing whether the number of microstates is increasing or decreasing, which can give an indication to what the sign should be.

Luke Bricca 1H
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

Re: sign of entropy

Postby Luke Bricca 1H » Sun Feb 04, 2018 9:29 am

Additionally, in connection with Gibbs free energy, if the sign of the delta G is negative, the reaction is spontaneous and favorable.


Return to “Entropy Changes Due to Changes in Volume and Temperature”

Who is online

Users browsing this forum: No registered users and 2 guests