Search found 27 matches
- Fri Mar 17, 2017 10:33 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Winter 2016 Final Exam Q2A [ENDORSED]
- Replies: 7
- Views: 1470
Re: Winter 2016 Final Exam Q2A [ENDORSED]
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?
- Fri Mar 17, 2017 8:53 pm
- Forum: Calculating Work of Expansion
- Topic: Chapter 8 question 8.27
- Replies: 2
- Views: 694
Re: Chapter 8 question 8.27
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...
- Fri Mar 17, 2017 8:45 pm
- Forum: Calculating Work of Expansion
- Topic: Chapter 8 question 8.27
- Replies: 2
- Views: 694
Chapter 8 question 8.27
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...
- Sun Mar 12, 2017 11:59 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2996882
Re: Post All Chemistry Jokes Here
What is the name of Agent 007's Eskimo cousin?
Bond. Polar Bond.
Bond. Polar Bond.
- Tue Mar 07, 2017 9:19 pm
- Forum: *Alkynes
- Topic: Naming Alkyne with cycloalkane and substituents?
- Replies: 1
- Views: 1358
Naming Alkyne with cycloalkane and substituents?
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...
- Sun Feb 26, 2017 11:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2996882
Re: Post All Chemistry Jokes Here
Oh, no someone dropped water on the floor...
- Thu Feb 23, 2017 1:45 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2996882
Re: Post All Chemistry Jokes Here
Correcting my friends after learning basic thermodynamics: A heated argument.
- Wed Feb 15, 2017 4:43 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Winter 2013 Midterm, Question 3A
- Replies: 2
- Views: 619
Re: Winter 2013 Midterm, Question 3A
Oh. I see. I just realized my mistake. Thank you for the help!
- Mon Feb 13, 2017 10:20 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Winter 2013 Midterm, Question 3A
- Replies: 2
- Views: 619
Winter 2013 Midterm, Question 3A
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 ...
- Sun Feb 12, 2017 11:55 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Midterm 2013 Question 3A
- Replies: 4
- Views: 925
Re: Midterm 2013 Question 3A
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...
- Sun Feb 12, 2017 7:07 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Chapter 14, Problem 14.19
- Replies: 4
- Views: 1694
Re: Chapter 14, Problem 14.19
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...
- Sat Feb 11, 2017 10:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Chapter 14, Problem 14.19
- Replies: 4
- Views: 1694
Chapter 14, Problem 14.19
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...
- Mon Jan 30, 2017 8:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25183
Re: Quiz 1 Preparation Answers
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.
Thanks.
- Sat Jan 21, 2017 1:37 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Chapter 8 problem 21 [ENDORSED]
- Replies: 3
- Views: 914
Re: Chapter 8 problem 21 [ENDORSED]
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...
- Sun Jan 15, 2017 9:44 pm
- Forum: Phase Changes & Related Calculations
- Topic: Homework Question 8.28
- Replies: 1
- Views: 1384
Homework Question 8.28
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...
- Mon Nov 14, 2016 6:25 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Finding Coordination Number and Oxidation State [ENDORSED]
- Replies: 7
- Views: 6281
Re: Finding Coordination Number and Oxidation State [ENDORSED]
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 ...
- Wed Nov 02, 2016 10:26 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Which Diagram to draw in a bond with both elements Z<8 and Z>8 [ENDORSED]
- Replies: 8
- Views: 1664
Re: Which Diagram to draw in a bond with both elements Z<8 and Z>8 [ENDORSED]
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...
- Tue Nov 01, 2016 11:40 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Which Diagram to draw in a bond with both elements Z<8 and Z>8 [ENDORSED]
- Replies: 8
- Views: 1664
Which Diagram to draw in a bond with both elements Z<8 and Z>8 [ENDORSED]
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 ...
- Tue Nov 01, 2016 11:31 pm
- Forum: Photoelectric Effect
- Topic: 2015 Midterm Question #3
- Replies: 2
- Views: 984
Re: 2015 Midterm Question #3
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...
- Tue Nov 01, 2016 11:20 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Paramagnetic vs Diamagnetic
- Replies: 2
- Views: 1304
Re: Paramagnetic vs Diamagnetic
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...
- Tue Nov 01, 2016 8:26 pm
- Forum: Lewis Structures
- Topic: Oxidation Number of Thallium in Tl2O3
- Replies: 3
- Views: 1619
Re: Oxidation Number of Thallium in Tl2O3
I understand now. Thank you very much to both of you!
- Mon Oct 31, 2016 3:36 pm
- Forum: Lewis Structures
- Topic: Oxidation Number of Thallium in Tl2O3
- Replies: 3
- Views: 1619
Oxidation Number of Thallium in Tl2O3
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...
- Tue Oct 11, 2016 3:29 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Quiz 1 prep #5 question [ENDORSED]
- Replies: 7
- Views: 1656
Re: Quiz 1 prep #5 question [ENDORSED]
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.
- Wed Sep 28, 2016 10:53 am
- Forum: Administrative Questions and Class Announcements
- Topic: Peer Facilitated Learning Sessions
- Replies: 32
- Views: 13317
Re: Peer Facilitated Learning Sessions
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.
- Thu Jul 21, 2016 4:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: H2O Shape [ENDORSED]
- Replies: 3
- Views: 1261
Re: H2O Shape [ENDORSED]
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.
- Thu Jul 21, 2016 3:56 pm
- Forum: Naming
- Topic: naming complex question regarding atom outside bracket [ENDORSED]
- Replies: 1
- Views: 512
Re: naming complex question regarding atom outside bracket [ENDORSED]
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 ...
- Thu Jun 23, 2016 4:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: When must the Preparatory Self-quizzes be turned-in?
- Replies: 3
- Views: 779
When must the Preparatory Self-quizzes be turned-in?
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...