Search found 28 matches

by Tara Ostad 1H
Fri Mar 17, 2017 1:31 pm
Forum: *Alkenes
Topic: Numbering Priority
Replies: 2
Views: 562

Re: Numbering Priority

Yes, that seems correct. Substituents also get priority from alphabetical order if the numbering is the same from either side.
by Tara Ostad 1H
Mon Mar 13, 2017 10:23 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram and Pt(s)
Replies: 4
Views: 512

Re: Cell Diagram and Pt(s)

Pt(s) is added to a cell diagram when one or both of the elements being reduced/oxidized, is aqueous in both states. Then, the element needs a solid electrode so Platinum is used because it does not react and provides a surface for the oxidation/reduction to occur.
by Tara Ostad 1H
Mon Mar 06, 2017 5:44 pm
Forum: *Electrophilic Addition
Topic: Transition step
Replies: 3
Views: 579

Re: Transition step

TA Andy said that for electrophilic addition that the slow step is always the first step.
by Tara Ostad 1H
Mon Mar 06, 2017 5:43 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Transition Steps
Replies: 7
Views: 792

Re: Transition Steps

Usually the atom, for electrophilic addition, will go to where the double bond is breaking. For SN2, the atom goes to the spot of the atom it is replacing (if that makes sense). The transition state is kind of just making the mechanism into 2 parts so it is easier to visualize what order it occurs in.
by Tara Ostad 1H
Tue Feb 28, 2017 6:44 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017999

Re: Post All Chemistry Jokes Here

Image
by Tara Ostad 1H
Tue Feb 28, 2017 6:41 pm
Forum: Administrative Questions and Class Announcements
Topic: quiz 2
Replies: 1
Views: 203

Re: quiz 2

I think your TA will tell you when they hand it back, otherwise Lavelle will probably mention it in lecture tomorrow or Friday.
by Tara Ostad 1H
Tue Feb 28, 2017 6:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz #3
Replies: 6
Views: 645

Re: Quiz #3

Yes, I believe it's everything post-midterm until this upcoming Friday
by Tara Ostad 1H
Tue Feb 21, 2017 2:53 pm
Forum: General Rate Laws
Topic: Slow Step
Replies: 3
Views: 368

Slow Step

How do we determine which step is the slow step in order to find the correct mechanism?
by Tara Ostad 1H
Tue Feb 14, 2017 9:14 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 2015 Midterm Q4&5 part D
Replies: 3
Views: 350

Re: 2015 Midterm Q4&5 part D

We have to do step 3 because it wants the entropy of vaporization of water at 298k, so we need to bring it back down to room temperature in order to do that because the first two steps just calculate it for boiling
by Tara Ostad 1H
Sat Feb 11, 2017 3:09 pm
Forum: Balancing Redox Reactions
Topic: Balancing Reaction Acidic and Basic
Replies: 1
Views: 205

Balancing Reaction Acidic and Basic

I was wondering if we need to know how to balance redox reactions acidicly and basically (like adding H+ and -OH) for the midterm. It was not covered in class but it is mentioned in the book.
by Tara Ostad 1H
Wed Feb 08, 2017 8:32 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics Equations
Replies: 1
Views: 321

Re: Kinetics Equations

I think we'll cover them as we cover more of the chapter, but if you are curious, page 55 of the course reader (the page at the beginning of the section) lists a lot of the ones that we will be using.
by Tara Ostad 1H
Wed Feb 01, 2017 6:04 pm
Forum: Balancing Redox Reactions
Topic: Cell diagram
Replies: 3
Views: 458

Re: Cell diagram

A porous disk would be represented by a disk(or wall) connect the two beakers. Instead of it being two separate beakers, it's like a beaker with two compartments, split by the porous disk. Here's a link to a picture.
http://img.sparknotes.com/figures/2/2c0 ... lldiag.gif
by Tara Ostad 1H
Tue Jan 24, 2017 4:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Energy of a Gas?
Replies: 2
Views: 343

Re: Energy of a Gas?

I do not think we have to as I don't remember Lavelle discussing this. However, most formulas and proofs we have to know are given to us (you can check what is on there by looking at the periodic table that came with the course reader.)
by Tara Ostad 1H
Tue Jan 17, 2017 10:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Born-Haber Cycle
Replies: 2
Views: 294

Re: Born-Haber Cycle

If Lavelle does not cover it in class, we do not need to know it (or at least that is how it was last quarter). He might cover it tomorrow or Friday.
by Tara Ostad 1H
Tue Jan 17, 2017 10:19 pm
Forum: Student Social/Study Group
Topic: Question about study resources
Replies: 1
Views: 299

Re: Question about study resources

I do not think so because they would have asked if you would also want that, but this quarter's course reader has some old midterms and finals in the back if you want some practice.
by Tara Ostad 1H
Mon Jan 16, 2017 9:39 am
Forum: Administrative Questions and Class Announcements
Topic: Peer Learning Sessions for 1/16
Replies: 2
Views: 260

Re: Peer Learning Sessions for 1/16

I would think yes because Dr. Lavelle didn't state otherwise on friday
by Tara Ostad 1H
Mon Nov 28, 2016 1:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2013 Final Question 2C
Replies: 2
Views: 328

Re: 2013 Final Question 2C

The question says that all of these have the [Kr]4d^10 configuration EXCEPT one of the following, which by what you discovered, would be Pd. So, Pd is the answer because it is the only one that does NOT have that configuration.
by Tara Ostad 1H
Mon Nov 28, 2016 1:17 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 1
Views: 343

Final

When will we find out the exact room we are in for the final (because MyUcla lists several) and do we need a scantron/blue book for the final?
by Tara Ostad 1H
Mon Nov 21, 2016 2:33 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Conjugate Seesaw [ENDORSED]
Replies: 1
Views: 245

Conjugate Seesaw [ENDORSED]

When we get tested on acids and bases, which I guess will be part of the final, will we be told if something is acting as an acid or base for these conjugate problems, or do we just have to figure it out ourselves?
by Tara Ostad 1H
Mon Nov 14, 2016 10:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Significant Figures [ENDORSED]
Replies: 3
Views: 502

Re: Significant Figures [ENDORSED]

I think he said that because the volumes were so small for that example that using sig figs would not show the change in concentration. So, in that case we would not use sig figs, but unless otherwise stated, I believe we have to use them.
by Tara Ostad 1H
Tue Nov 08, 2016 5:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibrium [ENDORSED]
Replies: 1
Views: 178

Re: Chemical Equilibrium [ENDORSED]

Well, when a reaction reaches equilibrium, it looks as if it has stopped reacting, but that is only because it is going fast from reactants to products and products to reactants. The reaction rates are the same going forwards and backwards. For a reaction to reach equilibrium, it must be reversible,...
by Tara Ostad 1H
Mon Oct 31, 2016 1:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Studying for the Midterm
Replies: 2
Views: 471

Studying for the Midterm

How are you guys studying for the midterm? The reading in the textbooks is quite long to re-read so I was just planning on going over the course reader and homework, but I'm not really sure if that's "in-depth" enough.
by Tara Ostad 1H
Wed Oct 26, 2016 1:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 3
Views: 330

Midterm

Will class be cancelled the day of the midterm? It would be nice to know in advance so I know how to plan my day.
by Tara Ostad 1H
Wed Oct 19, 2016 12:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Video Modules
Replies: 1
Views: 497

Re: Video Modules

I'm not really sure. On the website, it says it has the topics listed in the order they appear on the syllabus but I don't see anything regarding the topics we have covered for next week's quiz. Hopefully he'll post some.
by Tara Ostad 1H
Mon Oct 10, 2016 7:55 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017999

Re: Post All Chemistry Jokes Here

What do you do with a sick chemist?

If you can't helium, and you can't curium, you might as well barium
by Tara Ostad 1H
Sun Oct 09, 2016 9:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: orbitals
Replies: 1
Views: 192

Re: orbitals

No, s orbitals are the only ones without nodal planes because they have symmetric electron distribution and are just spherical.
by Tara Ostad 1H
Thu Sep 29, 2016 2:05 pm
Forum: General Science Questions
Topic: moles
Replies: 1
Views: 487

Re: moles

Moles give a consistent method to convert between atoms & molecules and grams. Also, one mole of anything will have 6.02e23 molecules of the substance, thus making it more consistent. One gram of O2 does not have the same amount of molecules as one gram of CO2. It's basically to keep measurement...
by Tara Ostad 1H
Sun Sep 25, 2016 3:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Textbooks
Replies: 3
Views: 413

Textbooks

I accidentally got the 5th edition of the textbook, will that really make a difference or should I get the 6th edition?

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