Search found 21 matches
- Tue Mar 14, 2017 9:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 577071
Re: Saying Thank You to Dr. Lavelle
Dear Dr. Lavelle, I have had you for 2 quarters now for 14A and 14B and I have learned so much in that time. You have been such an amazing professor and I can tell that you truly care about your students and their understanding. I really appreciate you putting in the time and effort to create resour...
- Tue Mar 14, 2017 8:54 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Stability of the Formation
- Replies: 3
- Views: 696
Re: Stability of the Formation
But when you look at the gauche conformation that is staggered with an angle of 60° versus the eclipsed by H conformation where it is eclipsed but the angle is at 120°, which one would be the more stable conformation?
- Tue Mar 14, 2017 8:51 pm
- Forum: *Cycloalkenes
- Topic: Numbering
- Replies: 1
- Views: 1331
Numbering
Hi All, I was confused about how to number cycloalkenes and why it doesn't follow the general rule of thumb that you want all of the substituents have lower numbers. Specifically at the bottom of p.28 in the Intro to Organic Chemistry book it gives an example about the correct way to number a cycloa...
- Tue Mar 14, 2017 1:46 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Stability of the Formation
- Replies: 3
- Views: 696
Stability of the Formation
Hi All, When doing the Newman Projections and looking at whether a conformation is staggered or eclipsed, I was wondering how you measure the stability of a projection. Is it based on the angles between the substituents or is it based on whether or not the substituents are eclipsed vs. staggered? Th...
Numbering
Hi All,
When you are numbering, why do you always need to start at one of the ends for an alkane? If the alkane has side chains that would have a lowering number system, why can't you start numbering on the side chain?
Thanks!
When you are numbering, why do you always need to start at one of the ends for an alkane? If the alkane has side chains that would have a lowering number system, why can't you start numbering on the side chain?
Thanks!
- Wed Feb 22, 2017 12:19 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Determining an Intermediate
- Replies: 1
- Views: 455
Determining an Intermediate
Hi All, In the elementary steps of a reaction mechanism, I understand that the reaction intermediate is the item that is cancelled out between the reactions, however I don't understand how the reaction intermediate is chosen. Does the intermediate have to be given in the reaction or is there a way t...
- Sun Feb 12, 2017 9:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Moles in Galvanic Cell
- Replies: 2
- Views: 1271
Moles in Galvanic Cell
Hi All, I was doing some of the homework problems about calculating the standard reaction Gibbs free energy for cell reactions and I was confused about how to calculate the moles when using the equation deltaG=-nFEcell. Do you have to go through the half-reactions to find out how many electrons were...
- Sun Feb 05, 2017 1:52 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Porous Disk
- Replies: 2
- Views: 1767
Porous Disk
Hi All,
I know that we didn't talk about this much in class so it probably won't be too important, but I was wondering what the difference was between a porous disk and a salt bridge, as well as why we use salt bridges instead of porous disks when calculating the potential of a cell.
Thanks!
I know that we didn't talk about this much in class so it probably won't be too important, but I was wondering what the difference was between a porous disk and a salt bridge, as well as why we use salt bridges instead of porous disks when calculating the potential of a cell.
Thanks!
- Fri Jan 27, 2017 5:06 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Problem 9.13
- Replies: 1
- Views: 388
Problem 9.13
Hi All, I had a question about Chapter 9 Problem 13, where it asks for the change in entropy for the gas assuming ideal behavior. I know that you need to calculate change in entropy for the difference in temperature and for the difference in volume and then add them, however I was confused as to why...
- Mon Jan 23, 2017 10:27 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Positional/Residual Entropy
- Replies: 1
- Views: 472
Positional/Residual Entropy
Hi All, I was going back through what we learned in the course reader about entropy, and I found myself really confused about when you need to calculate positional/residual entropy and what the difference is between the calculations of positional/residual entropy and when you calculate entropy regul...
- Fri Jan 13, 2017 4:17 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: State Functions and Non-State Functions
- Replies: 2
- Views: 647
State Functions and Non-State Functions
Hi All, Could someone possibly explain to me why state functions are additive and non-state functions aren't? I understand that state functions aren't dependent on the path taken and that you only need to look at the final and initial values but I still don't quite understand how that affects whethe...
- Sat Dec 03, 2016 11:32 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Kw and temperature
- Replies: 1
- Views: 483
Kw and temperature
Hi everyone,
I was wondering how Kw is affected by temperature and if there is a way to calculate the different Kw given the new temperature of your solution.
Thanks!
I was wondering how Kw is affected by temperature and if there is a way to calculate the different Kw given the new temperature of your solution.
Thanks!
- Sun Nov 20, 2016 11:28 pm
- Forum: Amphoteric Compounds
- Topic: Autoprotolysis of Water
- Replies: 1
- Views: 436
Autoprotolysis of Water
Hi all,
I had a question about the autoprotolysis of water and the transferring of a proton in the reaction. I didn't really understand what the purpose of that specific proton donation is and why that reaction occurs?
Thanks!
I had a question about the autoprotolysis of water and the transferring of a proton in the reaction. I didn't really understand what the purpose of that specific proton donation is and why that reaction occurs?
Thanks!
- Wed Nov 09, 2016 11:14 am
- Forum: Naming
- Topic: (en)2 naming
- Replies: 3
- Views: 697
Re: (en)2 naming
Hi so I have a clarification question about the use of prefixes when naming. If the ligand in the coordinate compound has a prefix of -di, -tri, -tetra, etc. anywhere in its name, rather than just in the front, then you should use the prefixes of -bis, -tris, -tetrakis, etc? I know that you use the ...
- Thu Nov 03, 2016 7:19 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Anti bonding Orbitals
- Replies: 3
- Views: 831
Anti bonding Orbitals
Hey everyone,
I'm a little bit confused about what an anti-bonding orbital actually is and how you can tell if something is an anti-bonding orbital vs. a bonding orbital. Thanks!
I'm a little bit confused about what an anti-bonding orbital actually is and how you can tell if something is an anti-bonding orbital vs. a bonding orbital. Thanks!
- Mon Oct 31, 2016 3:13 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: M.O. when out of phase
- Replies: 1
- Views: 393
M.O. when out of phase
Hi everyone! I was a little bit confused about what happens when atomic orbitals are out of phase. I know that you subtract the orbitals rather than adding them, but what would happen in the instance if the orbitals of O2 were out of phase? If you subtracted them then nothing would be left. What wou...
- Sun Oct 23, 2016 12:30 am
- Forum: Bond Lengths & Energies
- Topic: Resonance and Bond Length
- Replies: 1
- Views: 692
Resonance and Bond Length
Hi All,
I was going over my notes on resonance and bond length and I found myself pretty confused on how resonance affects the length of a bond and why the bond in a structure with resonance is experimentally observed as the average between two bond lengths rather than a single shorter or longer bond?
I was going over my notes on resonance and bond length and I found myself pretty confused on how resonance affects the length of a bond and why the bond in a structure with resonance is experimentally observed as the average between two bond lengths rather than a single shorter or longer bond?
- Sun Oct 23, 2016 12:18 am
- Forum: Student Social/Study Group
- Topic: Hedrick Summit Study Group Chem 14A
- Replies: 29
- Views: 4252
Re: Hedrick Summit Study Group Chem 14A
Hey everyone, I was also wondering if I could get in on this study group if it's still going on!
- Tue Oct 18, 2016 1:07 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations of Ions [ENDORSED]
- Replies: 1
- Views: 420
Electron Configurations of Ions [ENDORSED]
When talking about ions, are the amount of electrons being removed or added to the shell always going to make the shell full or empty? Or is there ever going to be a case where just one or two electrons are removed and leave the ion with a partially full shell?
- Sun Oct 09, 2016 10:10 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: HW 1.15
- Replies: 3
- Views: 738
HW 1.15
On problem 15 of the homework, it is given that a line is observed at 102.6 nm and asks for you to determine the values of n for the initial and final energy levels. How do you determine n if they are both variables?
- Fri Sep 30, 2016 9:30 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant Mole Ratios
- Replies: 1
- Views: 1386
Limiting Reactant Mole Ratios
Hi! I just had a general question when it comes to comparing the mole ratios in a limiting reactant equation. Once you've balanced the equation and converted everything into moles, when you compare the two, how do you know which product you compare the actual ratio with? For example, in the equation...