CHEMISTRY COMMUNITY

Jeannie Huang 3B

Yup, you want to give the double bond priority in numbering. So give it the lowest number first. In numbering, the priority goes as follows: 1. functional groups like --OH or carboxylic acid 2. double or triple bonds 3. other substituent groups Try to give #1 and #2 the lowest numbers first before p...

Jeannie Huang 3B

By definition, an ambident nucleophile is a molecule that has available lone pairs of electrons on two or more of its atoms--in other words, 2 places on it where it can react with another molecule. Draw out the Lewis structures to see. (It's similar to the idea of a bidentate ligand from 14A). Refer...

Jeannie Huang 3B

Yes, it is an error. There's some posts about it: viewtopic.php?f=140&t=11410&p=28315&hilit=solution+manual+error&

Jeannie Huang 3B

In electrolysis the Eo value is a negative value. The reaction isn't spontaneous, and you need to use an electric current to overcome the negative voltage and force it to occur.

Jeannie Huang 3B

It's usually given in the question. It'll specify if it's in acidic or basic solution, and you can balance the H+ and OH- as needed.

Jeannie Huang 3B

When the reaction involves aqueous ions (like Ag+) it's assumed that the water in the solution doesn't affect the reaction. However if another phase of water is involved in the reaction then yes the liquid water (or H+ and OH- ions) should be taken into account.

Jeannie Huang 3B

To answer the question, you need to draw the lewis structure for COF2. You should get a trigonal planar shape with C in the center. You could get 3 different orientations of the molecule since the O can be in one of the three corners. Following the equation, S = k ln W (refer to pg. 32 of course rea...

Jeannie Huang 3B

I believe the +1 mol is from 2 mol reactants --> 3 mol products. So change of mols was 3-2 =1.
Other people have posted about this question before so I recommend checking those out :]

Jeannie Huang 3B

I believe that the "net production of 1 mole of gas" refers to the fact that 1 mole of OF2 (part of the 2 moles of total reactant) produces 3 moles of product. Thus, the net difference is 3-2 moles = 1 mole of gas difference between reactants and products.

Jeannie Huang 3B

Mine is the rice krispy periodic table :)
(this was for my birthday a while back)
https://drive.google.com/file/d/0BzeS9b9yItnNYkVYY0Z5Y2VjWEU/view?usp=sharing

Jeannie Huang 3B

Although chlorine is in period 3, it's so electronegative that it doesn't like sharing electrons, and usually won't form anything more than one single bond. Thus, it's an exception to the expanded octet rule for periods >= 3.

Jeannie Huang 3B

It's a mistake. It's paramagnetic. Lavelle replied here: viewtopic.php?f=43&t=8834&p=22074&hilit=br2&

Jeannie Huang 3B

Q: Why should you never give up studying chemistry even if you feel like you're going to fail the final?

A: Because chem-is-try! <3

Jeannie Huang 3B

Why does that problem put diaqua before bixoxalato? Isn't it supposed to be according to alphabetical order?
so sodium diaqua bisoxalato ferrate (III)

Jeannie Huang 3B

The UCLA registrar site says that CHEM14B is an enforced corequisite to CHEM14BL, so I assume they won't let you enroll in the lab until you're in the lecture first...can anyone confirm? I have the same problem. Link: http://www.registrar.ucla.edu/schedule/subdet.aspx?srs=142117200&term=16W&...

Jeannie Huang 3B

I use the same methods as you do for those types of problems, and it wasn't marked incorrect or anything on the first quiz (after all, we arrive at the same answer). So, I assume it's okay to do so.

Jeannie Huang 3B

No. One element would have lower orbitals than the other only if it has a larger electronegativity.

Jeannie Huang 3B

I'm not quite sure what you're asking, but yes, whenever you want to find the electronic configuration of a diatomic molecule you should draw out the MO diagram. I find, however, that drawing only the middle portion of the diagram (the combined orbitals) is often sufficient to answer questions about...

Jeannie Huang 3B

I think the reason for this is that when the electronegativity difference is high, the electrostatic attraction between the positive and negative charges will also be high, causing a shorter bond length. The bond also takes on an increasingly ionic character. I'm not sure, however, if ionic compound...

Jeannie Huang 3B

Oxygen is more electronegative than chlorine. It has an electronegativity unit of 3.5 while chlorine is 3.0. But I'm fairly certain we only need to know the general trend and not specific details like this. http://butane.chem.uiuc.edu/cyerkes/chem102ae_fa08/homepage/Chem102AEFa07/Lecture_Notes_102/L...

Jeannie Huang 3B

I have the 5th edition textbook instead of the 6th. I've realize that some of the homework problems assigned may not correspond to the ones in the 5th edition. For instance, there was a question assigned on black body radiation which we obviously did not cover. I believe that chapter 1 might have be...

Jeannie Huang 3B

If we are calculating values using only constants, such as the wavelength of light emitted when an electron jumps from energy level n=4 to n=2, how many sig-figs should we use? Will we be using a sheet for constants and equations during exams (and thus should we follow the amount of sig-figs given t...

CHEMISTRY COMMUNITY

Search found 22 matches

Re: Homework 1.12C naming

Re: Ambident Nucleophiles

Re: Answer Book Error 14.35 (b)

Re: Negative Cell Potential

Re: Redox Reactions

Re: Water and Cell Diagrams

Re: Standard residual entropy problem

Re: 8.49

Re: Homework Question 8.49 - Why can you not use a mole rati

Re: Lavelle's favorite periodic table

Re: Determining which element to give a formal charge

Re: (Br2)2+ Paramagnetic or Diamagnetic

Re: Chemistry Jokes

Re: Using prefixes bis-, tris-, etc.

Re: Enrolling in 14BL

Re: Which methods to use when finding empirical formulas

Re: MO diagrams

Re: Valence e- Configuration

Re: Electronegativity and Bond Strength

Re: Which element is more electronegative?

Differences between 5th Edition and 6th Edition textbook

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