CHEMISTRY COMMUNITY

Raul Hernandez

Kind of unrelated question but: why is it 2X on the top? I didn't quite get that in the review session. Do you mind explaining that part?

Raul Hernandez

I did see that. Also, on the formula sheet we have "W(variable pressure)= -nRTLn(V2/V1)" and from another post I saw that in a reversible pathway the pressure seems to vary so we could use this equation. However, what was in the solutions manual didn't have the "Ln" part. So, now...

Raul Hernandez

The question reads: "Calculate the work for each of the following processes beginning with a gas sample in a piston assembly with T = 305 K, P = 1.79 atm, and V = 4.29 L: (a) irreversible expansion against a constant external pressure of 1.00 atm to a final volume of 6.52 L; (b) isothermal, rev...

Raul Hernandez

What is the name of Agent 007's Eskimo cousin?

Bond. Polar Bond.

Raul Hernandez

Hello. So, while doing some practice problems for molecular formulas and their names, I stumbled upon this problems and I really can't figure out why it is named the way it is. It says it has a "dimethyl" on the 7th and 8th carbon, but I don't understand how their counting the carbons or W...

Raul Hernandez

Oh, no someone dropped water on the floor...

Raul Hernandez

Correcting my friends after learning basic thermodynamics: A heated argument.

Raul Hernandez

Oh. I see. I just realized my mistake. Thank you for the help!

Raul Hernandez

Hi, for this problem, when actually plugin-in the numbers, the temperature of the katana is in Celsius and the value for its specific heat capacity is in Kelvin. Now, in the answer to the problem they left it in celsius and therefore the Kelvin did not cancel out. I converted it to Kelvin and got a ...

Raul Hernandez

Hi, I have an additional question to this problem: when actually plugin-in the numbers, the temperature of the katana is in Celsius and the value for its specific heat capacity is in Kelvin. Now, in the answer to the problem they left it in celsius and therefore the Kelvin did not cancel out. I conv...

Raul Hernandez

The solutions manual uses the positive reduction value for the anode, but notice that this positive reduction potential is being subtracted from the reduction potential of the cathode. We learned to reverse the sign of the reduction potential of the anode and then add the two half-reaction potentia...

Raul Hernandez

Hello, I have a question regarding the answer to the problem. The problem reads: "A student was given a standard Cu(s)|Cu2(aq) halfcell and another half-cell containing an unknown metal M immersed in 1.00 m M(NO3)2(aq). When the copper was connected as the anode at 25 C, the cell potential wa...

Raul Hernandez

For number 3, what equation do we use since there seems to be a change in pressure? I can't seem to get the answer posted here by any method I've tried.
Thanks.

Raul Hernandez

So, I have a small question regarding the signs: how come it's negative on the side of the water and positive on the copper side? I'm just confused because wouldn't the side of the copper be negative since it's doing work on its surroundings? Everything else makes sense, though. I'm just a bit confu...

Raul Hernandez

The homework question reads: "A sample of gas in a cylinder of volume 3.42 L at 298 K and 2.57 atm expands to 7.39 L by two different pathways. Path A is an isothermal, reversible expansion. Path B has two steps. In the fi rst step, the gas is cooled at constant volume to 1.19 atm. In the secon...

Raul Hernandez

I have another question regarding the coordination number: if one of the molecules attached to the central metal is bidentate, would we count that as another bond? For example, if there's a central metal with 4 ligands and 1 of those ligands happens to be bidentate, would the coordination number be ...

Raul Hernandez

It was an example on the 2013 Fall Midterm, and it is a heteronuclear molecule. My question was whether to use the diagram provided for the elements with z<8 or z>8 (both are similar but they differ in the placement of the sigma pz bonds). However, I think that the example given by Amy Ko (Thank you...

Raul Hernandez

I hope this is not trivial, but I was wondering what diagram do you choose to draw when you have two elements that are: one less than 8 protons and another with more than 8 protons. For example, how would you draw the Molecular Diagram for Fluorine and Carbon together (CF) and why? Any help will be ...

Raul Hernandez

This is one question that you shouldn't overthink. It gives you the velocity of the electron, correct? And then it asks you about the wavelength of the same electron, right? So, you should just see that there's no need to go back and find the energy of the photon or anything like that because the qu...

Raul Hernandez

I think the basic thing you need to know is that: if there's NO unpaired electrons in the molecule, then it is Diamagnetic and if there IS unpaired electrons it is Paramagnetic. Diamagnetic = no unpaired electrons, and it isn't attracted to magnetic fields (repelled). Paramagnetic = has unpaired ele...

Raul Hernandez

I understand now. Thank you very much to both of you!

Raul Hernandez

Hello, I hope this is not too trivial, but while doing some chapter problems I came across an example that asks for the oxidation number of Thallium in Tl2O3 (Problem 3.113 in the book). The answer says the ox. no. is 3+ but I don't understand how that's the answer. I drew the Lewis dot structure an...

Raul Hernandez

On the topic of Indeterminacy: do you guys know what do write in the equation for "delta x" if the position is known withing plus or minus a certain number? (let's say plus or minus 0.55). Thanks.

Raul Hernandez

For the session in Hedrick Hall, do we have to sign up or do we just show up? If so, must I be a member of AAP to sign up? Thanks.

Raul Hernandez

As explained in Chapter 4, the electrons would like to be as far away from each other as possible but they also will be repelled by the other elements and the arrangement that works best for this is to have the electrons to be on one side of the oxygen making it an angular ("bent") shape.

Raul Hernandez

So, I saw the same question and I did a bit of research. It seems that, just like in a regular compound, you still name the last element with the ending in "ide," and this is because it is outside of the brackets so it's a whole other element bonding with the whole molecule in brackets. I ...

Raul Hernandez

I don't recall hearing the due dates for the Preparatory Self-quizzes in either the Lectures or the discussions. Also, are they graded - since a grading percentage for them are not included in the syllabus - or are they just for the TA's to evaluate our understanding of the material as a section? An...

CHEMISTRY COMMUNITY

Search found 27 matches

Re: Winter 2016 Final Exam Q2A [ENDORSED]

Re: Chapter 8 question 8.27

Chapter 8 question 8.27

Re: Post All Chemistry Jokes Here

Naming Alkyne with cycloalkane and substituents?

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: Winter 2013 Midterm, Question 3A

Winter 2013 Midterm, Question 3A

Re: Midterm 2013 Question 3A

Re: Chapter 14, Problem 14.19

Chapter 14, Problem 14.19

Re: Quiz 1 Preparation Answers

Re: Chapter 8 problem 21 [ENDORSED]

Homework Question 8.28

Re: Finding Coordination Number and Oxidation State [ENDORSED]

Re: Which Diagram to draw in a bond with both elements Z<8 and Z>8 [ENDORSED]

Which Diagram to draw in a bond with both elements Z<8 and Z>8 [ENDORSED]

Re: 2015 Midterm Question #3

Re: Paramagnetic vs Diamagnetic

Re: Oxidation Number of Thallium in Tl2O3

Oxidation Number of Thallium in Tl2O3

Re: Quiz 1 prep #5 question [ENDORSED]

Re: Peer Facilitated Learning Sessions

Re: H2O Shape [ENDORSED]

Re: naming complex question regarding atom outside bracket [ENDORSED]

When must the Preparatory Self-quizzes be turned-in?