CHEMISTRY COMMUNITY

JennaMinami1I

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...

JennaMinami1I

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 :)

JennaMinami1I

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...

JennaMinami1I

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...

JennaMinami1I

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?

JennaMinami1I

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!

JennaMinami1I

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...

JennaMinami1I

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...

JennaMinami1I

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...

JennaMinami1I

From ASAPScience.

JennaMinami1I

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...

JennaMinami1I

I think it is because electronegativity is the tendency of atoms to attract a bonding pair of electrons, and is calculated, not experimentally measured

JennaMinami1I

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...

JennaMinami1I

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...

JennaMinami1I

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 ...

JennaMinami1I

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...

JennaMinami1I

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...

JennaMinami1I

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...

CHEMISTRY COMMUNITY

Search found 18 matches

Re: Saying Thank You to Dr. Lavelle

Re: Chair conformation drawing

Figuring out overall order of reaction based on balanced reaction

E- Transfer Diagram

Work Equation, changing V and P

Re: Calorimeters

Re: Using ICE Table

Re: Quiz 3 Prep

Re: sigma and pi bonds in p orbital

Re: Post All Chemistry Jokes Here

Lewis structure for O3 (ozone) [ENDORSED]

Re: Units for electronegativity

Re: Formal Charge vs. Octet [ENDORSED]

Re: Electron Emission Sig Figs

Re: Boundary Surface of Orbitals [ENDORSED]

Boundary Surface of Orbitals [ENDORSED]

Re: Orbitals [ENDORSED]

Re: Photoelectric Effect [ENDORSED]