Search found 17 matches
- Sun Mar 19, 2017 10:09 am
- Forum: General Rate Laws
- Topic: pre equilibrium
- Replies: 4
- Views: 667
Re: pre equilibrium
I'm still very confused by pre-equilibrium; how do we know when to use it(for example, if it were given on the final, in what way would it be worded or what specific words should we look for as cues to use it)?
- Sun Mar 19, 2017 9:55 am
- Forum: General Rate Laws
- Topic: Homework 15.65 part C
- Replies: 2
- Views: 841
Re: Homework 15.65 part C
Because this is an endothermic reaction, as can be seen through the activation energies of the forward and reverse reactions, the forward reaction will take in energy/heat and the reverse reaction will release energy/heat. When you raise the temperature of the system, it tries to go back to equilibr...
- Sun Mar 19, 2017 9:33 am
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Final 2013 Question 7
- Replies: 1
- Views: 750
Re: Final 2013 Question 7
3,3-dimethylpentane isn't included as an answer because it has 7 carbons, not 6. I believe that cyclic compounds could be considered (I googled it and found this: https://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/sterisom.htm ; it seems to have considered a cyclic compound as a constitutional...
- Sun Mar 19, 2017 9:23 am
- Forum: *Cycloalkanes
- Topic: Cycloalkanes as substituents
- Replies: 1
- Views: 775
Re: Cycloalkanes as substituents
I'm not quite sure of this either but I think the cycloalkane as a substituent would have the same priority as other common alkyl groups (like methyl, ethyl, and so on). I couldn't find an exact answer in the textbook, so I googled it and found this: https://www.angelo.edu/faculty/kboudrea/organic/I...
- Sun Mar 19, 2017 9:05 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Question 3A of Winter 2014 Practice Final
- Replies: 2
- Views: 355
Re: Question 3A of Winter 2014 Practice Final
I'm not quite sure how to go about answering this question without being given the values for the reduction potentials. I looked at previous answers for this question, but I'm still confused. In the course reader, we aren't given the reduction potentials, but some of the previous answers have said t...
- Sat Mar 18, 2017 1:21 pm
- Forum: *Alkenes
- Topic: naming alkenes
- Replies: 4
- Views: 980
Re: naming alkenes
I was very confused by this as well. After searching up methylhexdiene on Google, the only results are for methyl (or dimethyl) hexadiene. There seems to be no methylhexdiene (without the "a"). Even when searching up "hexdiene", the only results are for "hexadiene". I w...
- Tue Feb 21, 2017 10:01 am
- Forum: Administrative Questions and Class Announcements
- Topic: 14C
- Replies: 4
- Views: 614
Re: 14C
I think that you can email him about it too (I heard from one of the upperclassmen I know), but I don't know specifically in what manner or when. His email is on his class website.
- Wed Feb 15, 2017 5:25 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 11
- Views: 1078
Re: Cell Diagram
Is it possible that we will get marked down if we put it out of order when they are separated by the single vertical line? For example, if we put the solids at the end (correctly) but put the rest out of order (such as those that are gas, liquid, or aq)?
- Mon Jan 30, 2017 4:13 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: HW Ch. 8 #25
- Replies: 1
- Views: 366
Re: HW Ch. 8 #25
You're supposed to use the first reaction described in order to find the heat capacity of the calorimeter (divide 3.50 kJ by 7.32 C). Using q system = -q surroundings , you can find the change in internal energy of the neutralization reaction by having the change in internal energy equal to q system...
- Mon Jan 30, 2017 4:00 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Homework Problem 8.51
- Replies: 2
- Views: 385
Re: Homework Problem 8.51
I believe the reason they say that only 1/4 of the energy will be released is because the enthalpy of the reaction is for 4 moles of TNT, and they want to find how much energy is released with only 1 mole of TNT. That way, you can use it more easily to find the enthalpy released per liter, which is ...
- Sun Nov 27, 2016 2:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Change in molarity
- Replies: 2
- Views: 419
Re: Change in molarity
Can you please specify which examples in the course reader you are referencing? I'm a bit confused by what you're asking and it might help me (and others) understand what you're asking.
- Sun Nov 27, 2016 2:07 pm
- Forum: *Titrations & Titration Calculations
- Topic: Significant Figures in Equilibrium calculations
- Replies: 3
- Views: 547
Re: Significant Figures in Equilibrium calculations
I believe that we should still follow the rule in which we round at the end instead of rounding after every step, since that's what they told us to do before on the quizzes and midterm. I think that the practice midterm had rounded after every step as well, but I generally disregarded that and did w...
- Sun Nov 06, 2016 10:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14B and 14BL [ENDORSED]
- Replies: 12
- Views: 3882
Re: Chem 14B and 14BL [ENDORSED]
When I was planning my classes with my counselor for the next quarter, she initially didn't include 14BL with 14B, but when I asked her about it, she said that I definitely could take it together. I think that most people don't take it together but you could if you wanted to. However, as someone els...
- Sat Oct 29, 2016 12:22 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Midterm
- Replies: 9
- Views: 908
Re: Midterm
All material covered in Fundamentals and Chapters 1-4 up to the end of hybridization. Course Reader: All material up to page 105. Past Midterms in Course Reader: Pages 179-217 For more info go to this link: https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=157&t=16342 Will it cover material t...
- Sun Oct 23, 2016 4:15 pm
- Forum: Trends in The Periodic Table
- Topic: QUESTION ABOUT IONIC AND ATOMIC RADII
- Replies: 2
- Views: 468
Re: QUESTION ABOUT IONIC AND ATOMIC RADII
On Lavelle's website, he pointed out and posted errors from the solution manual. Problem 2.93 happens to be one of the questions that have an error in the solution manual. Here is the link: https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/Solution_Manual_Errors_6Ed.pdf Hope this hel...
- Sun Oct 23, 2016 4:10 pm
- Forum: Naming
- Topic: Naming for Quiz 2
- Replies: 6
- Views: 808
Re: Naming for Quiz 2
Naming compounds was covered in the very beginning of the course reader, so I'm expecting that we should know the simple rules that were outlined there. Besides, even if we aren't going to be quizzed on it, I feel that it would be helpful to know it anyways.
- Sun Oct 23, 2016 4:03 pm
- Forum: Sigma & Pi Bonds
- Topic: Valence Electron Configuration
- Replies: 1
- Views: 342
Re: Valence Electron Configuration
In the textbook (for the 6th edition), you can find a bit about valence electron configurations specifically on page 46 (it's on page 35 for the 5th edition). As for whether we will be tested on what we may not have gone over explicitly in lecture, I believe that he will be testing us on what the sy...