Search found 20 matches
- Fri Mar 17, 2017 2:03 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3608967
Re: Post All Chemistry Jokes Here
I'm triene, but I'm diene (;
- Fri Mar 17, 2017 2:00 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Boat/Chair
- Replies: 1
- Views: 459
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.
- Sun Mar 12, 2017 11:25 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3608967
Re: Post All Chemistry Jokes Here
Organic chemistry is difficult. Those who study it have alkynes of trouble.
- Sun Mar 05, 2017 11:39 pm
- Forum: Student Social/Study Group
- Topic: Chem 14C Discussion Swap
- Replies: 3
- Views: 1061
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?
- Sun Mar 05, 2017 11:32 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3608967
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!
Cu: I'm taking the two of you in for a salt!
Na and Cl: You'll never catch us alive, copper!
- Sun Feb 26, 2017 6:33 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-equilibrium
- Replies: 3
- Views: 879
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...
- Mon Feb 20, 2017 9:45 am
- Forum: *Electrophiles
- Topic: Rate Laws
- Replies: 2
- Views: 706
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!
- Tue Feb 14, 2017 9:08 pm
- Forum: Balancing Redox Reactions
- Topic: H+ and e-
- Replies: 4
- Views: 4658
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?
- Tue Feb 14, 2017 9:07 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Thermodynamics
- Replies: 2
- Views: 616
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.
- Tue Feb 14, 2017 9:03 pm
- Forum: Phase Changes & Related Calculations
- Topic: Change in internal energy= 0
- Replies: 4
- Views: 849
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...
- Tue Feb 14, 2017 9:00 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic Cells
- Replies: 4
- Views: 887
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...
- Tue Feb 14, 2017 8:55 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: When do you use Cv vs Cp if the question does not explicitly say which conditions it is under?
- Replies: 3
- Views: 939
Re: When do you use Cv vs Cp if the question does not explicitly say which conditions it is under?
I could be wrong, but I'm pretty sure you can use either as long as you're consistent in all of the parts.
- Sat Feb 11, 2017 5:42 pm
- Forum: Balancing Redox Reactions
- Topic: purpose of C(gr) at anode? [ENDORSED]
- Replies: 2
- Views: 632
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!
- Sat Feb 11, 2017 4:54 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Quiz One - #5 Calculating Heat
- Replies: 2
- Views: 585
Re: Quiz One - #5 Calculating Heat
The quizzes vary from day to day, so I would ask your TA or someone in your discussion.
- Thu Feb 02, 2017 9:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25670
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)?
- Thu Feb 02, 2017 9:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25670
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)?
- Tue Jan 31, 2017 9:24 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Sig Figs
- Replies: 3
- Views: 870
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...
- Sun Jan 29, 2017 10:07 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G and delta G naught
- Replies: 1
- Views: 46596
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...
- Sat Jan 21, 2017 10:17 am
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 8
- Views: 3484
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: ...
- Sun Jan 15, 2017 2:55 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: A System at Constant Volume
- Replies: 3
- Views: 816
Re: A System at Constant Volume
I think it depends on what the specific question tells you.