Search found 17 matches

by Emily_Lenh2A
Sun Mar 19, 2017 10:09 am
Forum: General Rate Laws
Topic: pre equilibrium
Replies: 4
Views: 539

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)?
by Emily_Lenh2A
Sun Mar 19, 2017 9:55 am
Forum: General Rate Laws
Topic: Homework 15.65 part C
Replies: 2
Views: 523

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...
by Emily_Lenh2A
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: 562

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...
by Emily_Lenh2A
Sun Mar 19, 2017 9:23 am
Forum: *Cycloalkanes
Topic: Cycloalkanes as substituents
Replies: 1
Views: 541

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...
by Emily_Lenh2A
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: 282

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...
by Emily_Lenh2A
Sat Mar 18, 2017 1:21 pm
Forum: *Alkenes
Topic: naming alkenes
Replies: 4
Views: 691

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...
by Emily_Lenh2A
Tue Feb 21, 2017 10:01 am
Forum: Administrative Questions and Class Announcements
Topic: 14C
Replies: 4
Views: 440

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.
by Emily_Lenh2A
Wed Feb 15, 2017 5:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram
Replies: 11
Views: 790

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)?
by Emily_Lenh2A
Mon Jan 30, 2017 4:13 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW Ch. 8 #25
Replies: 1
Views: 330

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...
by Emily_Lenh2A
Mon Jan 30, 2017 4:00 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Homework Problem 8.51
Replies: 2
Views: 308

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 ...
by Emily_Lenh2A
Sun Nov 27, 2016 2:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in molarity
Replies: 2
Views: 323

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.
by Emily_Lenh2A
Sun Nov 27, 2016 2:07 pm
Forum: *Titrations & Titration Calculations
Topic: Significant Figures in Equilibrium calculations
Replies: 3
Views: 459

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...
by Emily_Lenh2A
Sun Nov 06, 2016 10:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B and 14BL [ENDORSED]
Replies: 11
Views: 2939

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...
by Emily_Lenh2A
Sat Oct 29, 2016 12:22 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Midterm
Replies: 9
Views: 693

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...
by Emily_Lenh2A
Sun Oct 23, 2016 4:15 pm
Forum: Trends in The Periodic Table
Topic: QUESTION ABOUT IONIC AND ATOMIC RADII
Replies: 2
Views: 361

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...
by Emily_Lenh2A
Sun Oct 23, 2016 4:10 pm
Forum: Naming
Topic: Naming for Quiz 2
Replies: 6
Views: 605

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.
by Emily_Lenh2A
Sun Oct 23, 2016 4:03 pm
Forum: Sigma & Pi Bonds
Topic: Valence Electron Configuration
Replies: 1
Views: 258

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...

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