Search found 20 matches

by Hannah_El-Sabrout_2K
Fri Mar 17, 2017 2:03 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019846

Re: Post All Chemistry Jokes Here

I'm triene, but I'm diene (;
by Hannah_El-Sabrout_2K
Fri Mar 17, 2017 2:00 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Boat/Chair
Replies: 1
Views: 230

Re: Boat/Chair

You don't have to, but make sure that if you draw in the C-H bonds to write "H" or else it looks like a methyl group.
by Hannah_El-Sabrout_2K
Sun Mar 12, 2017 11:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019846

Re: Post All Chemistry Jokes Here

Organic chemistry is difficult. Those who study it have alkynes of trouble.
by Hannah_El-Sabrout_2K
Sun Mar 05, 2017 11:39 pm
Forum: Student Social/Study Group
Topic: Chem 14C Discussion Swap
Replies: 3
Views: 512

Re: Chem 14C Discussion Swap

On the same topic, I currently have Dicussion 2O (Thursday from 4-4:50), but I really need the Tuesday 1-1:50 discussion or any other discussion on Tuesday. Can anyone switch with me?
by Hannah_El-Sabrout_2K
Sun Mar 05, 2017 11:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019846

Re: Post All Chemistry Jokes Here

Criminal Elements:

Cu: I'm taking the two of you in for a salt!

Na and Cl: You'll never catch us alive, copper!
by Hannah_El-Sabrout_2K
Sun Feb 26, 2017 6:33 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-equilibrium
Replies: 3
Views: 383

Re: Pre-equilibrium

I don't think I quite understand what you're saying, but from what I do understand I think so. You are essentially trying to write a rate law (of the slow step) by using the fast step to get rid of the intermediates. In the end, you shouldn't have any intermediates or any parts of the fast reactions...
by Hannah_El-Sabrout_2K
Mon Feb 20, 2017 9:45 am
Forum: *Electrophiles
Topic: Rate Laws
Replies: 2
Views: 281

Re: Rate Laws

They are all different relationships between concentration and rate. Depending on which order the reaction is, you will get different predictions of how fast the reaction is going. Essentially, they are different reaction speed trends. Sorry if this was kind of confusing!
by Hannah_El-Sabrout_2K
Tue Feb 14, 2017 9:08 pm
Forum: Balancing Redox Reactions
Topic: H+ and e-
Replies: 4
Views: 1001

Re: H+ and e-

They do because one is +1 and the other is -1, so they add up to zero. Is there a specific question that you're referencing?
by Hannah_El-Sabrout_2K
Tue Feb 14, 2017 9:07 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Thermodynamics
Replies: 2
Views: 285

Re: Thermodynamics

I could be wrong, but I'm pretty sure residual entropy is the entropy at T=0K. Because although the third law states that deltaS=0 at T=0K, this is theoretical and can only happen if the substance is a perfect crystal. So, in reality, there will be some entropy.
by Hannah_El-Sabrout_2K
Tue Feb 14, 2017 9:03 pm
Forum: Phase Changes & Related Calculations
Topic: Change in internal energy= 0
Replies: 4
Views: 440

Re: Change in internal energy= 0

One of the conditions when internal energy is zero is when the system has no temperature change, more specifically when the question says "isothermal". But can't work still occur, so the internal energy would not be zero? Yes, you can still have a value for work, but the energy lost as wo...
by Hannah_El-Sabrout_2K
Tue Feb 14, 2017 9:00 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cells
Replies: 4
Views: 378

Re: Galvanic Cells

To add on to the last post, it's when you don't have a (l)/(s) conductor. This confused me at first because sometimes you'll have a liquid, but still need an inert electrode. This is because the liquid MUST be a conductor (so if it isn't, you still need an inert electrode). I hope you found this hel...
by Hannah_El-Sabrout_2K
Sat Feb 11, 2017 5:42 pm
Forum: Balancing Redox Reactions
Topic: purpose of C(gr) at anode? [ENDORSED]
Replies: 2
Views: 275

Re: purpose of C(gr) at anode? [ENDORSED]

C(gr) is interchangeable with Pt(s) since both serve as inert electrodes. They are needed to carry the electrons into/out of the electrode compartment. You pretty much need one whenever you have a hydrogen electrode. I hope that was helpful!
by Hannah_El-Sabrout_2K
Sat Feb 11, 2017 4:54 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Quiz One - #5 Calculating Heat
Replies: 2
Views: 302

Re: Quiz One - #5 Calculating Heat

The quizzes vary from day to day, so I would ask your TA or someone in your discussion.
by Hannah_El-Sabrout_2K
Thu Feb 02, 2017 9:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13730

Re: Quiz 1 Preparation Answers

For #6, why does the answer have 3 sig figs? We didn't use the 298.K, so shouldn't the sig figs be 4 (for 2580kJ and -2220.kJ/mol)?
by Hannah_El-Sabrout_2K
Thu Feb 02, 2017 9:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13730

Re: Quiz 1 Preparation Answers

For #6, why does the answer have 3 sig figs? We didn't use the 298.K, so shouldn't the sig figs be 4 (for 2580kJ and -2220.kJ/mol)?
by Hannah_El-Sabrout_2K
Tue Jan 31, 2017 9:24 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Sig Figs
Replies: 3
Views: 424

Re: Sig Figs

It's least because the whole point of sig figs is to maintain accuracy. The reason you go with the lowest sig figs is because for that number you are not sure about the other digits after it (ex. 4.5, you don't know what comes after the 5 --- it might be 4.5006), so you can't be sure about the accur...
by Hannah_El-Sabrout_2K
Sun Jan 29, 2017 10:07 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G and delta G naught
Replies: 1
Views: 9497

Re: Delta G and delta G naught

You are right, the difference between the two is that delta G naught is at standard conditions. The reason Professor Lavelle emphasized it is because delta G naught is always the same because it is referring to when the reactants/products are at standard temperature/pressure. As the rxn goes towards...
by Hannah_El-Sabrout_2K
Sat Jan 21, 2017 10:17 am
Forum: Significant Figures
Topic: Sig Figs
Replies: 8
Views: 808

Re: Sig Figs

Sig figs are the digits which give us useful information about the accuracy of a measurement. The rules for the are that non-zero digits are always significant, any zeros between two significant digits are significant and a final zero/trailing zeros in the decimal portion are significant. Examples: ...
by Hannah_El-Sabrout_2K
Sun Jan 15, 2017 2:55 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: A System at Constant Volume
Replies: 3
Views: 428

Re: A System at Constant Volume

I think it depends on what the specific question tells you.

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