## memorize

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

bellaha4F
Posts: 104
Joined: Wed Sep 18, 2019 12:20 am

### memorize

Do we have to memorize any of the entropies' of substances, such as water or co2?

Hiba Alnajjar_2C
Posts: 108
Joined: Fri Aug 09, 2019 12:17 am

### Re: memorize

I believe that the standard entropies of substances will be given to us, if needed. It doesn't seem like we need to memorize them.

Verity Lai 2K
Posts: 100
Joined: Sat Aug 24, 2019 12:18 am

### Re: memorize

There are no entropies given on the constant sheet, so they will provide any entropies you need in the question.

CameronDis2K
Posts: 51
Joined: Wed Feb 20, 2019 12:18 am

### Re: memorize

most entropies will be given to us, but it can be known that a perfect crystalline structure or molecule has a delta S of 0 J/K (though in reality, this is not possible, as seen with the 3rd law of thermodynamics)

Celena Kim 2I
Posts: 106
Joined: Sat Sep 14, 2019 12:17 am

### Re: memorize

Entropy values will be given to us; we won't need to memorize them.

BritneyP- 2c
Posts: 101
Joined: Sat Sep 14, 2019 12:15 am

### Re: memorize

The standard entropies will be given to us and we do not have to memorize them.

preyasikumar_2L
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

### Re: memorize

I'm pretty sure most entropy, enthalpy, and gibbs free energy values will be given to us, either in the problem or the constants/values/equations sheets. And I mean, know that ΔH of all elements in their standard states is 0, and know the trends for ΔH, ΔS, and ΔG (<0 is spontaneous, decrease in entropy, >0 is not spontaneous, increase in entropy, =0 neither fwd/rvs rxn is favored aka equilibrium).

Rodrigo2J
Posts: 102
Joined: Sat Jul 20, 2019 12:16 am

### Re: memorize

Entropy values will be given to us. If Dr. Lavelle wants us to know specific values he'll probably tell us.

RobertXu_2J
Posts: 104
Joined: Fri Aug 30, 2019 12:17 am

### Re: memorize

Entropy values are given to us.

Manav Govil 1B
Posts: 104
Joined: Sat Sep 07, 2019 12:19 am

### Re: memorize

We are given the entropy values we need to know for the exam on the equation sheet as they did for the midterm. We will not know or use the entropy values that are not proved on the equation sheet.

san_2F
Posts: 118
Joined: Sat Jul 20, 2019 12:15 am

### Re: memorize

We were given the entropy values on the midterm so I'm assuming the same will happen for the rest of the tests from here on out.

Posts: 106
Joined: Sat Aug 24, 2019 12:17 am
Been upvoted: 1 time

### Re: memorize

No, they give us any needed entropy values but you should know how entropy will change in general. ex. entropy increases if a liquid becomes a gas

Noe BM 1J
Posts: 50
Joined: Sat Sep 07, 2019 12:17 am

### Re: memorize

I think such numbers like that one will always be given to us.

TimVintsDis4L
Posts: 104
Joined: Sat Aug 17, 2019 12:17 am

### Re: memorize

I believe that every constant we may ever need will be provided for us on every test and exam. However, some equations may not be and we may have to derive them.

rabiasumar2E
Posts: 108
Joined: Thu Jul 11, 2019 12:15 am

### Re: memorize

After taking the midterm, I'm pretty certain he'll provide us with any constants we may need for an exam.