Search found 18 matches

by JennaMinami1I
Sun Mar 19, 2017 12:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 186
Views: 39191

Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle, Thank you for your diligence, love, and enthusiasm for teaching Chemistry at UCLA. You are the only professor I know of who gives so many resources to his students in hopes that they succeed in the course/develop a true interest in the topic taught. You go above and beyond what UCLA req...
by JennaMinami1I
Sun Mar 19, 2017 12:17 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair conformation drawing
Replies: 2
Views: 363

Re: Chair conformation drawing

Hi!
I think if you draw it the other way, it might be considered flipped, in which the equatorial and axial hydrogens will also switch positions.
Best be safe and draw like the way in the book, just to be consistent :)
by JennaMinami1I
Fri Feb 17, 2017 2:46 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Figuring out overall order of reaction based on balanced reaction
Replies: 1
Views: 170

Figuring out overall order of reaction based on balanced reaction

Hello! Not sure if this is the right location for this question, but how would I solve a problem like this: Given: Fe2+ +O2 + H2O ---> Fe3+ +OH- Rate: k[Fe2+]*[OH-]^2*[O2] The overall order of the rxn and the order with respect to OH- are: __________ Do I just look at the powers of the concentration...
by JennaMinami1I
Sat Feb 04, 2017 8:24 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E- Transfer Diagram
Replies: 1
Views: 144

E- Transfer Diagram

I was wondering why there is no salt bridge/porous disk in the diagram for electrolysis. Is it because there is already something that is transferring ions (the electron current). Do Ion-selective electrode redox reactions also not have a salt bridge/porous disk, because the electrode helps drive th...
by JennaMinami1I
Sat Jan 21, 2017 4:28 pm
Forum: Calculating Work of Expansion
Topic: Work Equation, changing V and P
Replies: 2
Views: 282

Work Equation, changing V and P

This relates to midterm 2013 question 4 part A in back of course reader

Why is it that when volume and pressure are both changing that work can equal:

w=-nRTln(V2/V1) or w=-nRTln (P1/P2)


Is it because the pressure is inversely related to the volume?
by JennaMinami1I
Fri Jan 13, 2017 3:57 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Calorimeters
Replies: 3
Views: 309

Re: Calorimeters

To add on to this question/for clarification, is it correct to say;

Isolated: The universe
Bomb Calorimeter: Closed
constant P calorimetry: Open

???
Thank you!
by JennaMinami1I
Tue Nov 22, 2016 5:28 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Using ICE Table
Replies: 1
Views: 320

Re: Using ICE Table

Hi! ICE table really confused me at first but basically: I stands for Initial C stands for change E stands for equilibrium You will usually have to use the ICE table in order to find concentrations or partial pressure at equilibrium when the system is not at equilibrium, or to find Kp, Kc, Ka, or Kb...
by JennaMinami1I
Mon Nov 14, 2016 12:51 pm
Forum: Ideal Gases
Topic: Quiz 3 Prep
Replies: 2
Views: 331

Re: Quiz 3 Prep

To add on to the last comment, when figuring out whether to lower or raise the pressure, it's helpful to look at the # of moles of gas for reactant and products! Reactants: 2 mols Products: 3 mols Increasing pressure shifts the position of the equilibrium to the side with fewer moles of gas, which w...
by JennaMinami1I
Thu Nov 03, 2016 10:26 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: sigma and pi bonds in p orbital
Replies: 1
Views: 208

Re: sigma and pi bonds in p orbital

Hello! Pi bonds occur due to side by side overlapping of atomic orbitals in a plane Sigma bonds occur due to end to end overlapping of atomic orbitals Overlapping p orbitals can either form pi or sigma bonds. The way the bond orients and overlaps depends which one it is. Here is a picture that I fou...
by JennaMinami1I
Thu Oct 27, 2016 6:18 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 6981
Views: 771041

Re: Post All Chemistry Jokes Here

From ASAPScience.
by JennaMinami1I
Fri Oct 21, 2016 7:17 pm
Forum: Lewis Structures
Topic: Lewis structure for O3 (ozone) [ENDORSED]
Replies: 3
Views: 2960

Lewis structure for O3 (ozone) [ENDORSED]

Hi Chemistry Friends! I was wondering why the Lewis structure for O3 is O-O=O (where the Formal charge from left to right is -1,+1,0) (3 e- pairs on left oxygen, 1 e- pair on middle oxygen, 2 e- pairs on right oxygen) and not O=O=O (where all formal charges are 0) (2 e- pairs on left and right oxyge...
by JennaMinami1I
Thu Oct 20, 2016 11:10 am
Forum: Electronegativity
Topic: Units for electronegativity
Replies: 4
Views: 784

Re: Units for electronegativity

I think it is because electronegativity is the tendency of atoms to attract a bonding pair of electrons, and is calculated, not experimentally measured
by JennaMinami1I
Wed Oct 19, 2016 3:51 pm
Forum: Lewis Structures
Topic: Formal Charge vs. Octet [ENDORSED]
Replies: 1
Views: 283

Re: Formal Charge vs. Octet [ENDORSED]

Formal Charge = 0 is the most stable, and is an important component in determining the Lewis Structure of a molecule. If we add a double bond to one of the Flourines, the Boron would have an octet but the flourine would have a formal charge of +1, and boron would have an extra electron that it norma...
by JennaMinami1I
Tue Oct 11, 2016 2:03 pm
Forum: Significant Figures
Topic: Electron Emission Sig Figs
Replies: 2
Views: 286

Re: Electron Emission Sig Figs

Hello! I had a similar questions and asked my TA... I had put 4 sig figs in my answer, which I derived from Planck's Constant (6.626*10^-34), and he said that would be the best, since the energy levels (n=#) are constants. Use the number of sigfigs in Planck's Constant, which is 4! (I hope this is a...
by JennaMinami1I
Thu Oct 06, 2016 6:17 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Boundary Surface of Orbitals [ENDORSED]
Replies: 2
Views: 708

Re: Boundary Surface of Orbitals [ENDORSED]

Well... this is awkward because I'm answering my own question. But just in case anybody clicked on this because they were also confused, I found the answer to my question in the textbook! Boundary Surfaces: Shapes of atomic orbitals s-orbital: Spherical p-orbital: Dumbbell or peanut d-orbital: Four ...
by JennaMinami1I
Thu Oct 06, 2016 4:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Boundary Surface of Orbitals [ENDORSED]
Replies: 2
Views: 708

Boundary Surface of Orbitals [ENDORSED]

I noticed in the course reader that it stated we should know the boundary surface of orbitals. Is that the shape of the region in which electrons can be found (for example: the s orbital is a ping pong ball shape in which there is a high probability of finding electrons inside of it, the p orbital h...
by JennaMinami1I
Thu Oct 06, 2016 9:34 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals [ENDORSED]
Replies: 9
Views: 809

Re: Orbitals [ENDORSED]

This was a concept that I was pretty confused about as well, but from my understanding: Electrons are located in different energy levels (n=1,2,3, etc) Each energy level has a certain space where there is a high percentage that electrons might be located in. These are called orbitals, and are differ...
by JennaMinami1I
Thu Sep 29, 2016 12:13 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect [ENDORSED]
Replies: 12
Views: 1284

Re: Photoelectric Effect [ENDORSED]

I understand that you need the threshold energy to in order to get the kinetic energy, but I don't really understand what it is. What does threshold energy mean in the photoelectric effect and where do you get it from? Hi! From my understanding, the threshold energy (also known as work function/Gre...

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