Search found 72 matches

by Elle_Mendelson_2K
Sun Mar 17, 2019 9:13 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: pseudo rate law
Replies: 7
Views: 126

Re: pseudo rate law

We will be told I believe
by Elle_Mendelson_2K
Sun Mar 17, 2019 9:11 am
Forum: First Order Reactions
Topic: 1st order decay?
Replies: 2
Views: 82

Re: 1st order decay?

Yes because you’re reactants are decreasing and slope is negative
by Elle_Mendelson_2K
Sat Mar 16, 2019 9:53 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Determining n
Replies: 6
Views: 121

Re: Determining n

how do u find delta n as in moles not electrons
by Elle_Mendelson_2K
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: 908

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?
by Elle_Mendelson_2K
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: 908

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
by Elle_Mendelson_2K
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: 44

Re: Concentration cells

What do we need to know about concentrations cells? Will we asked to calculate anything? or just the concept?
by Elle_Mendelson_2K
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: 908

Re: Week 9 Worksheet (2E,I,K)

Where can we find week tens worksheet?
by Elle_Mendelson_2K
Tue Mar 12, 2019 12:26 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Collision Theory
Replies: 5
Views: 228

Re: Collision Theory

Will we need to do calculations for collision theory? Is the equation is not on the constants and equations sheet?
by Elle_Mendelson_2K
Tue Mar 12, 2019 10:21 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: graphing
Replies: 1
Views: 35

graphing

Will we have to graph anything by hand or will graphs be given to us?
by Elle_Mendelson_2K
Tue Mar 12, 2019 10:19 am
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 18
Views: 377

Re: Final

Does anyone know what the midterm average was?
by Elle_Mendelson_2K
Tue Mar 12, 2019 10:18 am
Forum: Administrative Questions and Class Announcements
Topic: Lyndon's Review Sheets
Replies: 9
Views: 402

Re: Lyndon's Review Sheets

He has not yet posted it.
by Elle_Mendelson_2K
Mon Mar 11, 2019 3:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Final Exam
Replies: 23
Views: 237

Re: Final Exam

Do we need to know the common ion effect for the final?
by Elle_Mendelson_2K
Mon Mar 11, 2019 2:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Final Exam
Replies: 23
Views: 237

Re: Final Exam

Will we have to solve cubic equations on the final?
by Elle_Mendelson_2K
Mon Mar 11, 2019 2:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Multiplying K by a factor
Replies: 1
Views: 41

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?
by Elle_Mendelson_2K
Mon Mar 11, 2019 2:06 pm
Forum: Ideal Gases
Topic: Ideal gases
Replies: 5
Views: 69

Re: Ideal gases

When can we assume the ideal gas law as an approximation? It is asked on Dr. Lavelle's first outline.
by Elle_Mendelson_2K
Tue Feb 26, 2019 7:24 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: #14.15 a
Replies: 1
Views: 45

#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?
by Elle_Mendelson_2K
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: 30

# 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+
by Elle_Mendelson_2K
Tue Feb 26, 2019 12:43 pm
Forum: Balancing Redox Reactions
Topic: HOMEWORK 14.5 D
Replies: 4
Views: 46

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?
by Elle_Mendelson_2K
Tue Feb 26, 2019 12:41 pm
Forum: Balancing Redox Reactions
Topic: HOMEWORK 14.5 D
Replies: 4
Views: 46

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!
by Elle_Mendelson_2K
Tue Feb 26, 2019 12:16 pm
Forum: Balancing Redox Reactions
Topic: HOMEWORK 14.5 D
Replies: 4
Views: 46

Re: HOMEWORK 14.5 D

Hi again, can you explain both parts? I can't seem to get P4->Ph3 balanced!
by Elle_Mendelson_2K
Tue Feb 26, 2019 11:49 am
Forum: Balancing Redox Reactions
Topic: HOMEWORK 14.5 D
Replies: 4
Views: 46

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
by Elle_Mendelson_2K
Tue Feb 26, 2019 11:47 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 49092

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?
by Elle_Mendelson_2K
Thu Feb 21, 2019 10:06 am
Forum: Balancing Redox Reactions
Topic: Week 7 Homework
Replies: 15
Views: 159

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?
by Elle_Mendelson_2K
Wed Feb 20, 2019 8:45 pm
Forum: Balancing Redox Reactions
Topic: Week 7 Homework
Replies: 15
Views: 159

Week 7 Homework

What should this weeks homework be on?
by Elle_Mendelson_2K
Fri Feb 08, 2019 11:21 am
Forum: Administrative Questions and Class Announcements
Topic: Lyndon's Midterm Review Sheet
Replies: 2
Views: 184

Lyndon's Midterm Review Sheet

Does anyone know the Title of Lyndon's Midterm Review Sheet?
by Elle_Mendelson_2K
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: 155

Re: Delta H

Delta H is the change in enthalpy. H = U + PV is one of the equations.
by Elle_Mendelson_2K
Thu Feb 07, 2019 8:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 8
Views: 152

Re: Midterm

Does that mean that in the 6 edition anything after section 11 will not be on the exam?
by Elle_Mendelson_2K
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: 154

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.
by Elle_Mendelson_2K
Fri Jan 25, 2019 11:00 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Le Chatelier's Principle question
Replies: 4
Views: 69

Re: Le Chatelier's Principle question

How does expansion and compression effect the reaction?
by Elle_Mendelson_2K
Thu Jan 24, 2019 9:06 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Salts
Replies: 1
Views: 51

Re: Salts

Around 12.55
by Elle_Mendelson_2K
Thu Jan 24, 2019 9:04 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: converting between kp and kc
Replies: 4
Views: 76

Re: converting between kp and kc

Will we need to convert from Kc to Kp for this test?
by Elle_Mendelson_2K
Wed Jan 23, 2019 8:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Initial Q
Replies: 3
Views: 97

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 ...
by Elle_Mendelson_2K
Sat Jan 19, 2019 3:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Studying for First Discussion Test
Replies: 10
Views: 143

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?)
by Elle_Mendelson_2K
Sun Jan 13, 2019 10:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Test Dates
Replies: 3
Views: 76

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!
by Elle_Mendelson_2K
Sun Jan 13, 2019 10:02 pm
Forum: Ideal Gases
Topic: R [ENDORSED]
Replies: 5
Views: 96

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
by Elle_Mendelson_2K
Sun Jan 13, 2019 9:59 pm
Forum: Student Social/Study Group
Topic: New to Lavelle
Replies: 32
Views: 614

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...
by Elle_Mendelson_2K
Sat Dec 08, 2018 8:24 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentates
Replies: 2
Views: 73

Re: Polydentates

hello, why Is this hexadentate/ why don't the oxygens with a double bond bind to the tm?
IMG_1409.JPG
by Elle_Mendelson_2K
Fri Dec 07, 2018 3:40 pm
Forum: Biological Examples
Topic: Hemoglobin Question
Replies: 2
Views: 104

Re: Hemoglobin Question

Will someone please explain heme complexs. Thank you
by Elle_Mendelson_2K
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: 4863

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Thank you Lyndon! Is this the same level of difficulty as the final will be?
by Elle_Mendelson_2K
Thu Nov 29, 2018 11:41 pm
Forum: Hybridization
Topic: Hybridization Notation
Replies: 10
Views: 176

Re: Hybridization Notation

I believe Lavelle prefers the d to be at the end.
by Elle_Mendelson_2K
Thu Nov 29, 2018 11:39 pm
Forum: Sigma & Pi Bonds
Topic: Sigma bonds
Replies: 6
Views: 166

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)
by Elle_Mendelson_2K
Thu Nov 29, 2018 11:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: trans/cis
Replies: 4
Views: 75

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.
by Elle_Mendelson_2K
Thu Nov 29, 2018 11:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.72
Replies: 2
Views: 65

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 ...
by Elle_Mendelson_2K
Thu Nov 29, 2018 11:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX2E2
Replies: 14
Views: 242

Re: AX2E2

On the exam, will we need to write << or can we just write < ?
by Elle_Mendelson_2K
Thu Nov 29, 2018 11:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th ed Chapter 4 Number 109b
Replies: 1
Views: 33

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.
by Elle_Mendelson_2K
Thu Nov 29, 2018 12:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radicals
Replies: 2
Views: 73

Re: Radicals

What is the difference between a radical and diamagnetic molecule?
by Elle_Mendelson_2K
Tue Nov 27, 2018 12:00 pm
Forum: Ionic & Covalent Bonds
Topic: MIDTERM WORKED OUT ANSWERS?
Replies: 2
Views: 61

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!
by Elle_Mendelson_2K
Sun Nov 25, 2018 5:51 pm
Forum: Sigma & Pi Bonds
Topic: Location of Sigma and Pi Bonds
Replies: 5
Views: 72

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!
by Elle_Mendelson_2K
Sun Nov 25, 2018 5:51 pm
Forum: Sigma & Pi Bonds
Topic: Location of Sigma and Pi Bonds
Replies: 5
Views: 72

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!
by Elle_Mendelson_2K
Sun Nov 18, 2018 10:04 pm
Forum: General Science Questions
Topic: Thanksgiving Week
Replies: 8
Views: 281

Re: Thanksgiving Week

Does anyone know if Lyndon or any of the other Uas/ TAs are having their review sessions on Tuesday?
by Elle_Mendelson_2K
Wed Nov 14, 2018 6:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Thanksgiving [ENDORSED]
Replies: 14
Views: 307

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!
by Elle_Mendelson_2K
Wed Nov 14, 2018 6:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework for Week 7
Replies: 2
Views: 52

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
by Elle_Mendelson_2K
Wed Nov 14, 2018 6:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework for Week 7 [ENDORSED]
Replies: 1
Views: 70

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
by Elle_Mendelson_2K
Mon Nov 05, 2018 3:57 pm
Forum: Trends in The Periodic Table
Topic: Periodic Trends in Relation
Replies: 3
Views: 119

Re: Periodic Trends in Relation

Does anyone know why the atomic radius of Al is greater than the atomic radius of silver?
by Elle_Mendelson_2K
Sun Nov 04, 2018 10:58 am
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 5043

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!
by Elle_Mendelson_2K
Sat Nov 03, 2018 9:45 pm
Forum: Administrative Questions and Class Announcements
Topic: What the Midterm Will Cover
Replies: 5
Views: 104

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?
by Elle_Mendelson_2K
Sat Nov 03, 2018 9:41 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 5043

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!
by Elle_Mendelson_2K
Sat Nov 03, 2018 9:12 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 5043

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

Hello! Does anyone know where we can find the solutions sheet. Thank you!
by Elle_Mendelson_2K
Mon Oct 29, 2018 8:00 pm
Forum: *Particle in a Box
Topic: Midterm
Replies: 15
Views: 819

Re: Midterm

Does anyone know how many questions will be on the midterm?
by Elle_Mendelson_2K
Mon Oct 29, 2018 7:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Exam
Replies: 7
Views: 235

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)
by Elle_Mendelson_2K
Sun Oct 21, 2018 10:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: S,P,D,F
Replies: 6
Views: 138

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.
by Elle_Mendelson_2K
Sun Oct 21, 2018 10:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Schrodinger's Wave Function
Replies: 10
Views: 162

Re: Schrodinger's Wave Function

Will we have to memorize it or will it be given on the front sheet of the exam?
by Elle_Mendelson_2K
Sun Oct 21, 2018 10:05 pm
Forum: Properties of Electrons
Topic: Concept Behind Orbitals
Replies: 6
Views: 115

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!
by Elle_Mendelson_2K
Sun Oct 21, 2018 10:04 pm
Forum: Properties of Electrons
Topic: Concept Behind Orbitals
Replies: 6
Views: 115

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!
by Elle_Mendelson_2K
Sun Oct 14, 2018 3:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Grades??
Replies: 4
Views: 109

Re: Grades??

Does anyone know when grades will be posted to the website?
by Elle_Mendelson_2K
Wed Oct 10, 2018 4:43 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilution Question
Replies: 1
Views: 129

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/ ...
by Elle_Mendelson_2K
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: 28194

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!

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