CHEMISTRY COMMUNITY

Josephine_Tang_1N

Is there a link for Lavelle's review session from today?

Josephine_Tang_1N

Will the final be more focused on material at the end of the quarter?

Josephine_Tang_1N

If this is referring to Section 4.4 in the green organic textbook, they state that all the statements they make reference the reaction in Figure 4.6, which is an SN2 reaction.

Josephine_Tang_1N

Bryan Vega 2E wrote:Would a prefix, such as "di" in dimethyl, affect the order when naming alphabetically?

no!

Josephine_Tang_1N

Will the order always be in alphabetical order when naming the structures ? Sometimes it can vary if there's a "substituent in a substituent" type of situation (i.e. IUPAC naming for isopropyl branch would be 2-methylpropyl which would be included amongst other substituents if applicable)...

Josephine_Tang_1N

For a multistep reaction profile where we are estimating it for each step, how can we know how high/low/wide to draw each step?

Josephine_Tang_1N

Sebastian wrote:If we weren't able to make it to lecture on Wednesday, what is another option to obtain our midterm?

I would email your TA to ask if they can bring it to office hours or your next discussion

Josephine_Tang_1N

They're available at the Information office (Young 3034)! I think they open at 7AM.

Josephine_Tang_1N

Have the solutions been posted anywhere yet?

Josephine_Tang_1N

Just a note: Chrome does work for the audio bruincast (normal or iPod/iPad version), but you'll have to use another browser if you want to see the video!

Josephine_Tang_1N

Chem Mod also posted a response on another post saying that larger molecules with more electrons contribute more entropy because (basically) there are more total particles to be knocked around and cause disorder.

Josephine_Tang_1N

I was in a UA review session and he said that usually the adiabatic (q=0) is irreversible--just another note!

Josephine_Tang_1N

Definitely in acidic solution and basic solution reactions. They're not included in the cell diagrams because technically with aqueous solutions, they are by definition a solute with water so it'd be redundant to add water.

Josephine_Tang_1N

Instructions: "Write the half-reaction and devise a galvanic cell (write a cell diagram) to study each of the following reactions: (a) AgBr_{(s)} \rightleftharpoons Ag^+_{(aq)} + Br^-_{(aq)} , a solubility equilibrium" I don't understand where to draw the two half-r...

Josephine_Tang_1N

For this problem, it can be calculated that the energy of the unhybridized carbon bonds = 2880 kJ while the hybridized bonds = 3108 kJ. Why is the higher energy more stable in this case? Even with consideration that these bonds are the ones formed (therefore negative), the absolute energy is higher ...

Josephine_Tang_1N

They're basically the unhybridized Lewis structures (being asked to compare to hybridized).

Josephine_Tang_1N

Right - this is since the volume decreases (negative $\Delta$ V) and corresponds to a change from: - P $\Delta$ V to + P $\Delta$ V.

Josephine_Tang_1N

Will any of the 14B lectures be Webcasted?

Josephine_Tang_1N

I would assume the system is isolated because thermodynamic problems calculate changes in energy

Josephine_Tang_1N

I think he mentioned something about going to another one of your TA's sections!

Josephine_Tang_1N

If a product or reactant is a solid or liquid, is its contribution to the K calculation automatically 1?

Josephine_Tang_1N

Correct me if I'm wrong but I think $\pi$ 2p bond switches with the $\sigma$ 2p once z $\geq$ 8 because there are actually electrons occupying the space for pi bonds.

Josephine_Tang_1N

This questions asks for Lewis structures of a few gaseous molecules to see if they would contribute to global warming. Part (d) asks for SO2, which I drew S as the central atom double bonded with O on both sides - both O's and S have a lone pair in my drawing, which has zero formal charge on each at...

Josephine_Tang_1N

If a molecule has enough atoms to have different structures depending on which you count as the central atom, how would you describe the molecular shape? For example, (CH3)2Be is a linear structure when considering Be as the central atom, but the carbon would be considered tetrahedral on its own?

Josephine_Tang_1N

Generally, I base it on how far away the elements are from each other on the periodic table: the farther they are i.e. opposite sides of the periodic table, the more ionic in character.

Josephine_Tang_1N

I was looking at the practice exams in the workbook for Quiz #2 and saw that some of the questions were on things that aren't covered in Chapter 2 and 3 i.e. sigma and pi bonds, hybridization, bond order, etc. Do we still do these problems and turn them in next week when our discussion is?

Josephine_Tang_1N

I'm under the assumption that the post dates coincide with the week count at the top righthand corner of my.ucla.edu (see attached photo)

Josephine_Tang_1N

For testing purposes, is there a difference between writing 1.8 x 10^-2 and 0.018? I know they're synonymous, but I've seen both used in the textbook and workbook so I was wondering if there is a preference for either when it comes to giving a final answer.

Josephine_Tang_1N

Is anyone down to meet up Sunday night?

Josephine_Tang_1N

I'm in Hitch C, but would def wanna meet up and study sometime!

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Final Exam Details and Review Sessions Winter 2017

Re: Final Exam Details and Review Sessions Winter 2017

Re: Delta G Double Dagger, Delta H Double Dagger, Delta S Double Dagger

Re: Naming [ENDORSED]

Re: Naming [ENDORSED]

Drawing Reaction Profiles

Re: Midterm Winter 2017

Re: Fall 2016 Finals Still Available?

Re: Midterm Winter 2017

Re: Bruincast Audio Problem

Re: Midterm Winter 2013 problem 5B

Re: Reversibility

Re: H2O in Galvanic Cell Diagram

Homework 14.15 (a)

Question 8.77

Re: Question 8.77

Re: delta u sign

Re: Bruincast

Re: Closed system

Re: Discussion Section

Re: Water in K calculation

Re: Sigma and Pi order in MO

Fall 2012 Midterm Q5B

Larger Molecular Shapes

Re: About the "Rough Guideline"

Workbook prep for Quiz #2

Re: Posting on chem com

Re: All students read this sig fig post [ENDORSED]

Re: Hitch Study Group

Re: Hitch Study Group