Search found 72 matches
- Sun Mar 17, 2019 9:13 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: pseudo rate law
- Replies: 7
- Views: 1111
Re: pseudo rate law
We will be told I believe
- Sun Mar 17, 2019 9:11 am
- Forum: First Order Reactions
- Topic: 1st order decay?
- Replies: 2
- Views: 489
Re: 1st order decay?
Yes because you’re reactants are decreasing and slope is negative
- Sat Mar 16, 2019 9:53 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Determining n
- Replies: 6
- Views: 837
Re: Determining n
how do u find delta n as in moles not electrons
- Sat Mar 16, 2019 10:02 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Week 9 Worksheet (2E,I,K)
- Replies: 13
- Views: 5307
Re: Week 9 Worksheet (2E,I,K)
I think this may be due to you using log instead of ln? On the equations sheet for the nearest equation they use ln. Which should we use?
- Sat Mar 16, 2019 9:58 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Week 9 Worksheet (2E,I,K)
- Replies: 13
- Views: 5307
Re: Week 9 Worksheet (2E,I,K)
Hello! When I plug in the same formulas and do all the same steps, I get a couple numbers off. For example, for 1d I got -75740.725. Is this a rounding issue or is something off in my settings. I don't think I rounded anything until the end.
Further for 1c I got .169V instead of .157V
Further for 1c I got .169V instead of .157V
- Wed Mar 13, 2019 3:18 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Week 9 Worksheet (2E,I,K)
- Replies: 13
- Views: 5307
Re: Week 9 Worksheet (2E,I,K)
Thank you!
- Tue Mar 12, 2019 6:12 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration cells
- Replies: 2
- Views: 353
Re: Concentration cells
What do we need to know about concentrations cells? Will we asked to calculate anything? or just the concept?
- Tue Mar 12, 2019 12:45 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Week 9 Worksheet (2E,I,K)
- Replies: 13
- Views: 5307
Re: Week 9 Worksheet (2E,I,K)
Where can we find week tens worksheet?
- Tue Mar 12, 2019 12:26 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Collision Theory
- Replies: 5
- Views: 747
Re: Collision Theory
Will we need to do calculations for collision theory? Is the equation is not on the constants and equations sheet?
- Tue Mar 12, 2019 10:21 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: graphing
- Replies: 1
- Views: 237
graphing
Will we have to graph anything by hand or will graphs be given to us?
- Tue Mar 12, 2019 10:19 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 18
- Views: 2045
Re: Final
Does anyone know what the midterm average was?
- Tue Mar 12, 2019 10:18 am
- Forum: Administrative Questions and Class Announcements
- Topic: Lyndon's Review Sheets
- Replies: 9
- Views: 1347
Re: Lyndon's Review Sheets
He has not yet posted it.
- Mon Mar 11, 2019 3:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Final Exam
- Replies: 23
- Views: 1804
Re: Final Exam
Do we need to know the common ion effect for the final?
- Mon Mar 11, 2019 2:52 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Final Exam
- Replies: 23
- Views: 1804
Re: Final Exam
Will we have to solve cubic equations on the final?
- Mon Mar 11, 2019 2:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Multiplying K by a factor
- Replies: 1
- Views: 204
Multiplying K by a factor
when we multiply the conc by a factor lets say of two, do we square k? if we divide conc by 2 do we square root it?
- Mon Mar 11, 2019 2:06 pm
- Forum: Ideal Gases
- Topic: Ideal gases
- Replies: 5
- Views: 441
Re: Ideal gases
When can we assume the ideal gas law as an approximation? It is asked on Dr. Lavelle's first outline.
- Tue Feb 26, 2019 7:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: #14.15 a
- Replies: 1
- Views: 213
#14.15 a
Can someone explain why we switch AgBr -> Ag + Br- instead of Ag-> Ag+? I get that you could say that because the standard cell potential of the first is less positive, you would switch that one however the original reaction. Is that why?
- Tue Feb 26, 2019 1:13 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: # 14.9 b 6th ed
- Replies: 1
- Views: 230
# 14.9 b 6th ed
Hello, will someone explain how to figure out n? In the solutions manual it says that n is 6. The reaction is: 6Fe3+ + 2Cr3+ +7h2O---> 6 Fe2+ + Cr2O7 2- + 14H+
- Tue Feb 26, 2019 12:43 pm
- Forum: Balancing Redox Reactions
- Topic: HOMEWORK 14.5 D
- Replies: 4
- Views: 353
Re: HOMEWORK 14.5 D
Also, does the order of the elements matter? As long as they are on the correct side, is there a difference?
- Tue Feb 26, 2019 12:41 pm
- Forum: Balancing Redox Reactions
- Topic: HOMEWORK 14.5 D
- Replies: 4
- Views: 353
Re: HOMEWORK 14.5 D
Thank you so much! wouldn't it be 4P4? Or can you explain why there is only one P4? thank you!
- Tue Feb 26, 2019 12:16 pm
- Forum: Balancing Redox Reactions
- Topic: HOMEWORK 14.5 D
- Replies: 4
- Views: 353
Re: HOMEWORK 14.5 D
Hi again, can you explain both parts? I can't seem to get P4->Ph3 balanced!
- Tue Feb 26, 2019 11:49 am
- Forum: Balancing Redox Reactions
- Topic: HOMEWORK 14.5 D
- Replies: 4
- Views: 353
HOMEWORK 14.5 D
Will someone explain how to balance d in chapter 14 problem 5 in the 6th edition. I don't understand why the OH is on the right side instead of the left when you would add H2O on the left and therefore OH- on the right
- Tue Feb 26, 2019 11:47 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 408875
Re: Advice from a Medical Student [ENDORSED]
Thank you so much! Would you say that any other chem classes were as helpful for the MCAT or did the MCAT only cover 14a and b material?
- Thu Feb 21, 2019 10:06 am
- Forum: Balancing Redox Reactions
- Topic: Week 7 Homework
- Replies: 15
- Views: 1245
Re: Week 7 Homework
There were elements of Gibbs free energy in many different sections of the text book. Which chapter should we focus on? Also, should we read those sections?
- Wed Feb 20, 2019 8:45 pm
- Forum: Balancing Redox Reactions
- Topic: Week 7 Homework
- Replies: 15
- Views: 1245
Week 7 Homework
What should this weeks homework be on?
- Sat Feb 09, 2019 8:01 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Question 6th ED
- Replies: 1
- Views: 210
Homework Question 6th ED
Can some one explain chapter 8 #51
- Fri Feb 08, 2019 11:21 am
- Forum: Administrative Questions and Class Announcements
- Topic: Lyndon's Midterm Review Sheet
- Replies: 2
- Views: 412
Lyndon's Midterm Review Sheet
Does anyone know the Title of Lyndon's Midterm Review Sheet?
- Fri Feb 08, 2019 11:19 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H
- Replies: 7
- Views: 1228
Re: Delta H
Delta H is the change in enthalpy. H = U + PV is one of the equations.
- Thu Feb 07, 2019 8:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 8
- Views: 924
Re: Midterm
Does that mean that in the 6 edition anything after section 11 will not be on the exam?
- Fri Jan 25, 2019 11:42 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Test 1
- Replies: 9
- Views: 777
Re: Test 1
While it is possible to have a negative pH or a pH that is above 14, for the purpose of this class, we are only considering phs of 0-14.
Hope this helps.
Hope this helps.
- Fri Jan 25, 2019 11:00 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Le Chatelier's Principle question
- Replies: 4
- Views: 478
Re: Le Chatelier's Principle question
How does expansion and compression effect the reaction?
- Thu Jan 24, 2019 9:06 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Salts
- Replies: 1
- Views: 146
Re: Salts
Around 12.55
- Thu Jan 24, 2019 9:04 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: converting between kp and kc
- Replies: 4
- Views: 458
Re: converting between kp and kc
Will we need to convert from Kc to Kp for this test?
- Wed Jan 23, 2019 8:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Initial Q
- Replies: 3
- Views: 460
Re: Initial Q
I don't believe you switch the x values. Instead, if q>k then the reaction sits to the left. All that means is that the reaction favors the reactants. I believe you get a negative value only for the c potion of the ice table usually for the reactants because that is what you have first. Then in the ...
- Sat Jan 19, 2019 3:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Studying for First Discussion Test
- Replies: 10
- Views: 823
Re: Studying for First Discussion Test
Does anyone know if the UA sessions will still be available this Monday? (even though it is a long weekend?)
- Sun Jan 13, 2019 10:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test Dates
- Replies: 3
- Views: 402
Test Dates
Does anyone know the dates of when both of the tests will be administered? I found the midterm and the final dates but not the two chapter tests. Thank you!
- Sun Jan 13, 2019 10:02 pm
- Forum: Ideal Gases
- Topic: R [ENDORSED]
- Replies: 5
- Views: 561
Re: R [ENDORSED]
(P)ressure is in atm (atmospheric)
(N) is moles
(V) is liters
(T) is kelvins
(R) is a constant ".0821" liters x atm/moles x kelvin
(N) is moles
(V) is liters
(T) is kelvins
(R) is a constant ".0821" liters x atm/moles x kelvin
- Sun Jan 13, 2019 9:59 pm
- Forum: Student Social/Study Group
- Topic: New to Lavelle
- Replies: 32
- Views: 5308
Re: New to Lavelle
Personally, I find attending lectures and reading through the textbooks critical! I think that doing as many book work problems as you can is so important and will prepare you well for his tests. Additionally, attending the workshops helps a lot. Just for reference- last quarter the average grade wa...
- Sat Dec 08, 2018 8:24 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentates
- Replies: 2
- Views: 257
Re: Polydentates
hello, why Is this hexadentate/ why don't the oxygens with a double bond bind to the tm?
- Fri Dec 07, 2018 3:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21332
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Will someone please explain 22
- Fri Dec 07, 2018 3:40 pm
- Forum: Biological Examples
- Topic: Hemoglobin Question
- Replies: 2
- Views: 387
Re: Hemoglobin Question
Will someone please explain heme complexs. Thank you
- Fri Dec 07, 2018 3:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21332
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Will someone please explain number 20?
- Fri Dec 07, 2018 3:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21332
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Thank you Lyndon! Is this the same level of difficulty as the final will be?
- Thu Nov 29, 2018 11:41 pm
- Forum: Hybridization
- Topic: Hybridization Notation
- Replies: 10
- Views: 924
Re: Hybridization Notation
I believe Lavelle prefers the d to be at the end.
- Thu Nov 29, 2018 11:39 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma bonds
- Replies: 6
- Views: 754
Re: Sigma bonds
Sigma bonds are about the internuclear axis and overlap on top of one another (like two pancakes) whereas pi bonds interlap side to side like (two vertical rods)
- Thu Nov 29, 2018 11:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: trans/cis
- Replies: 4
- Views: 654
Re: trans/cis
another thing to note is that cis and trans usually are isomers meaning they have different properties. For example, one isomer can be polar while another can be non polar.
- Thu Nov 29, 2018 11:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.72
- Replies: 2
- Views: 314
Re: 4.72
A simpler way to look at it is that the N is surrounded by three of the same atom. Therefore, because they are the same atom with the same electronegativity the dipole moments will cancel. Something to note is that this molecule will cancel because this molecule is not one planar, each angle is 120 ...
- Thu Nov 29, 2018 11:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX2E2
- Replies: 14
- Views: 4575
Re: AX2E2
On the exam, will we need to write << or can we just write < ?
- Thu Nov 29, 2018 11:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 6th ed Chapter 4 Number 109b
- Replies: 1
- Views: 143
Re: 6th ed Chapter 4 Number 109b
It could be because the two lone pairs effect the molecule equally. Therefore, the molecule will stay linear.
- Thu Nov 29, 2018 12:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Radicals
- Replies: 2
- Views: 346
Re: Radicals
What is the difference between a radical and diamagnetic molecule?
- Tue Nov 27, 2018 12:00 pm
- Forum: Ionic & Covalent Bonds
- Topic: MIDTERM WORKED OUT ANSWERS?
- Replies: 2
- Views: 328
MIDTERM WORKED OUT ANSWERS?
Hello,
Where can we find the worked out solutions to the midterm? Are they on the class website? I have searched Chem Community and haven't found anything but remember Professor Lavelle saying he will post the worked out solutions.
Thank you!
Where can we find the worked out solutions to the midterm? Are they on the class website? I have searched Chem Community and haven't found anything but remember Professor Lavelle saying he will post the worked out solutions.
Thank you!
- Sun Nov 25, 2018 5:51 pm
- Forum: Sigma & Pi Bonds
- Topic: Location of Sigma and Pi Bonds
- Replies: 5
- Views: 414
Re: Location of Sigma and Pi Bonds
Will someone explain # 3 b for 2F in the 7th edition?
I got part of the question right, my lewis structure showed that there are 2 pi bonds and 2 sigma bonds, but it says that there is also 1 pi bond and 2 sigma bonds.
Thank you!
I got part of the question right, my lewis structure showed that there are 2 pi bonds and 2 sigma bonds, but it says that there is also 1 pi bond and 2 sigma bonds.
Thank you!
- Sun Nov 25, 2018 5:51 pm
- Forum: Sigma & Pi Bonds
- Topic: Location of Sigma and Pi Bonds
- Replies: 5
- Views: 414
Re: Location of Sigma and Pi Bonds
Will someone explain # 3 b for 2F in the 7th edition?
I got part of the question right, my lewis structure showed that there are 2 pi bonds and 2 sigma bonds, but it says that there is also 1 pi bond and 2 sigma bonds.
Thank you!
I got part of the question right, my lewis structure showed that there are 2 pi bonds and 2 sigma bonds, but it says that there is also 1 pi bond and 2 sigma bonds.
Thank you!
- Sun Nov 18, 2018 10:04 pm
- Forum: General Science Questions
- Topic: Thanksgiving Week
- Replies: 8
- Views: 945
Re: Thanksgiving Week
Does anyone know if Lyndon or any of the other Uas/ TAs are having their review sessions on Tuesday?
- Wed Nov 14, 2018 6:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Thanksgiving [ENDORSED]
- Replies: 14
- Views: 1589
Thanksgiving [ENDORSED]
Hello,
Does anyone know if we are ahead in class and won't have lecture next Wednesday? I'm trying to make travel plans :).
Thanks!
Does anyone know if we are ahead in class and won't have lecture next Wednesday? I'm trying to make travel plans :).
Thanks!
- Wed Nov 14, 2018 6:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework for Week 7
- Replies: 2
- Views: 186
Homework for Week 7
Hello!
I have the 7th edition of the textbook and was wondering what homework was acceptable for this week as in Lecture we are only up to 2E.
Thank you
I have the 7th edition of the textbook and was wondering what homework was acceptable for this week as in Lecture we are only up to 2E.
Thank you
- Wed Nov 14, 2018 6:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework for Week 7 [ENDORSED]
- Replies: 1
- Views: 165
Homework for Week 7 [ENDORSED]
Hello!
I have the 7th edition of the textbook and was wondering what homework was acceptable for this week as in Lecture we are only up to 2E.
Thank you
I have the 7th edition of the textbook and was wondering what homework was acceptable for this week as in Lecture we are only up to 2E.
Thank you
- Mon Nov 05, 2018 3:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 18649
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Will someone explain 10A?
- Mon Nov 05, 2018 3:57 pm
- Forum: Trends in The Periodic Table
- Topic: Periodic Trends in Relation
- Replies: 3
- Views: 768
Re: Periodic Trends in Relation
Does anyone know why the atomic radius of Al is greater than the atomic radius of silver?
- Sun Nov 04, 2018 10:58 am
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 18649
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Hello, for number 6a I keep getting 9.36X10 ^-46 instead of 9.36*10^-11 will someone explain what I am doing wrong? I have looked at another students work and we did the exact same thing but I got a different answer. Please help!!
Thank you!
Thank you!
- Sat Nov 03, 2018 9:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: What the Midterm Will Cover
- Replies: 5
- Views: 484
Re: What the Midterm Will Cover
Are there any past exams Lavelle has released? I received an email from a third party saying there was a study guide on their website. Does anyone think it will be helpful?
- Sat Nov 03, 2018 9:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 18649
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Will someone explain 8b? I know that we need to use all of the information given in the question but I am not sure how wavelength corresponds to work functions. Thank you!
- Sat Nov 03, 2018 9:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 18649
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Hello! Does anyone know where we can find the solutions sheet. Thank you!
- Mon Oct 29, 2018 8:00 pm
- Forum: *Particle in a Box
- Topic: Midterm
- Replies: 17
- Views: 4253
Re: Midterm
Does anyone know how many questions will be on the midterm?
- Mon Oct 29, 2018 7:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Exam
- Replies: 7
- Views: 931
Re: Exam
Hello! Does anyone know if chapter 1 E and 1 F will be on the midterm as they were not on test two. (I am using the 7Th edition textbook)
- Sun Oct 21, 2018 10:12 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: S,P,D,F
- Replies: 6
- Views: 2688
Re: S,P,D,F
How are Quantum Numbers involved? My TA was saying that you can tell properties through Quantum Numbers but I didn't quite understand it.
- Sun Oct 21, 2018 10:06 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Schrodinger's Wave Function
- Replies: 10
- Views: 994
Re: Schrodinger's Wave Function
Will we have to memorize it or will it be given on the front sheet of the exam?
- Sun Oct 21, 2018 10:05 pm
- Forum: Properties of Electrons
- Topic: Concept Behind Orbitals
- Replies: 6
- Views: 593
Re: Concept Behind Orbitals
Hello! I was wondering if anyone could explain the concept behind nodal planes? I am having trouble conceptualizing it.
Thank you!
Thank you!
- Sun Oct 21, 2018 10:04 pm
- Forum: Properties of Electrons
- Topic: Concept Behind Orbitals
- Replies: 6
- Views: 593
Re: Concept Behind Orbitals
Hello! I was wondering if anyone could explain the concept behind nodal planes? I am having trouble conceptualizing it.
Thank you!
Thank you!
- Sun Oct 14, 2018 3:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grades??
- Replies: 4
- Views: 299
Re: Grades??
Does anyone know when grades will be posted to the website?
- Wed Oct 10, 2018 4:43 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Dilution Question
- Replies: 1
- Views: 216
Dilution Question
Hello! Will someone explain G5, from the 7th edition textbook? I understand how to find the Molarity of the compound in the solution, I just don't understand why when finding how much volume of the solution to obtain 2.15 nmol of Na+ you multiply the 2.15X 10^3 mol of Na / 0.0796 by 1mol of Na2CO3/ ...
- Tue Oct 09, 2018 5:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
- Replies: 135
- Views: 39165
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Are these questions similar to those on the test this week? The worksheet obviously covers the topics on the exam but is the phrasing and level of difficulty similar?
Thank you!
Thank you!