Search found 21 matches

by Sarah_Kremer_1A
Sun Mar 19, 2017 12:14 pm
Forum: *Cycloalkanes
Topic: Naming Cycloalkanes
Replies: 2
Views: 426

Re: Naming Cycloalkanes

tert-butyl is a special substituent that Dr. Lavelle mentioned in his lecture -- it generally looks like a plus sign (+). The tert and the butyl go together. I don't think he ever explained how it is named, just that tert-butyl is a substituent that we should know.
by Sarah_Kremer_1A
Sun Mar 19, 2017 12:13 pm
Forum: *Calculations Using ΔG° = -RT ln K
Topic: Arrhenius Graphs
Replies: 3
Views: 629

Re: Arrhenius Graphs

The slope of the line on the graph is equal to -Ea/R. Since R is a constant and you can find the slope using the data points, you can then find Ea.
by Sarah_Kremer_1A
Sun Mar 19, 2017 10:47 am
Forum: General Rate Laws
Topic: pre equilibrium
Replies: 4
Views: 503

Re: pre equilibrium

The normal approach is used when the first step is the slow step (normally given). The pre-equilibrium approach is used when the second step is the slow step (also normally given).
by Sarah_Kremer_1A
Sat Mar 18, 2017 10:46 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: pH using Nernst Equation
Replies: 2
Views: 328

Re: pH using Nernst Equation

I think 4B is separate from 4A, which is why you don't use n=2. They aren't the same question, and use different chemicals. As for how they found n=1, I'm not sure!
by Sarah_Kremer_1A
Sat Mar 18, 2017 10:42 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation with Log
Replies: 3
Views: 308

Re: Nernst Equation with Log

F= 96485, not 964853! You have an extra number in there. If you use the correct value for F, you should get the right number.
by Sarah_Kremer_1A
Sat Mar 18, 2017 10:40 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation
Replies: 3
Views: 305

Re: Nernst Equation

the temperature should be in kelvin, since other constants use kelvin.
by Sarah_Kremer_1A
Sat Mar 18, 2017 10:37 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Bonds
Replies: 4
Views: 445

Re: Bonds

Furthermore, the substituents generally have equatorial (horizontal) bonds while the hydrogens have axial bonds.
by Sarah_Kremer_1A
Mon Feb 20, 2017 1:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 14607

Re: Quiz 2 Winter 2017

Arshia_Sabir_3E wrote:Can someone please help me with #3? I used the integrated rate law for first order and I got t=205 seconds



For #3, it is a first order reaction, so you use the corresponding equation
ln[A] = -kt + ln[A0]
so, ln(.33) = -(.0068)t + ln(.75)
ln(.33/.75) = -.0068t
t = ln(.33/.75)/-.0068
t = 120 sec
by Sarah_Kremer_1A
Sat Feb 11, 2017 3:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Review Session
Replies: 1
Views: 181

Midterm Review Session

Hi, I was wondering where the video of the midterm review session is posted? I can't seem to find it.
Thank you!
by Sarah_Kremer_1A
Sun Jan 29, 2017 5:09 pm
Forum: Phase Changes & Related Calculations
Topic: Derivations
Replies: 2
Views: 190

Derivations

Will we have to know how to derive the equations we derived in class for the quiz?
by Sarah_Kremer_1A
Sun Jan 22, 2017 3:09 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework Chapter 8 Problem 8.27
Replies: 1
Views: 279

Re: Homework Chapter 8 Problem 8.27

On Friday in class Prof Lavelle introdued the equation w=-nRT(vf/vi). You use this equation in this instance since the pressure is not constant and becuase it is a reversible reaction. Those are the conditions for using this equation. If you use this equation, you should get the correct answer.
by Sarah_Kremer_1A
Sun Jan 15, 2017 10:23 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Which method to pick [ENDORSED]
Replies: 2
Views: 396

Re: Which method to pick [ENDORSED]

It depends on the information given in the problem. For example, if bond constants are given, then you should use that method to solve the problem.
by Sarah_Kremer_1A
Sun Nov 27, 2016 3:36 pm
Forum: Polyprotic Acids & Bases
Topic: Finding the K Overall [ENDORSED]
Replies: 3
Views: 1289

Re: Finding the K Overall [ENDORSED]

And this only applies to polyprotic acids, since they have more than one K values
by Sarah_Kremer_1A
Sun Nov 27, 2016 3:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam [ENDORSED]
Replies: 2
Views: 446

Final Exam [ENDORSED]

Will the final exam equally cover all topics covered in the course? Or will the questions be more about material after the midterm?
by Sarah_Kremer_1A
Thu Nov 10, 2016 2:59 pm
Forum: Naming
Topic: Table of all the ligand names
Replies: 3
Views: 363

Re: Table of all the ligand names

and will we need to know how many bonds they form and their charges? i have a feeling yes, but there isn't a specific table i can find with that information...
by Sarah_Kremer_1A
Fri Nov 04, 2016 12:53 pm
Forum: Hybridization
Topic: Polar vs Non polar
Replies: 5
Views: 885

Re: Polar vs Non polar

Also, in the case of atoms attached to a ring structure, the polarity differs. For example, if there is a ring structure, and there is a chlorine attached to carbon atoms directly across from one another, the dipole moments cancel and the molecule is non polar. However, if the chlorine atoms are not...
by Sarah_Kremer_1A
Fri Oct 28, 2016 11:34 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Midterm
Replies: 9
Views: 647

Re: Midterm

I think we should know the general shape of the molecule - such as what a tetrahedral looks like - but we don't need to be able to draw it. He just wants us to be able to take a molecule and state its shape, without any picture or specifics.
by Sarah_Kremer_1A
Fri Oct 21, 2016 4:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 825855

Re: Post All Chemistry Jokes Here

What do you call a clown who is in jail?
A silicon.
by Sarah_Kremer_1A
Fri Oct 14, 2016 4:14 pm
Forum: Properties of Light
Topic: QUIZ 1 [ENDORSED]
Replies: 7
Views: 849

Re: QUIZ 1 [ENDORSED]

I asked Dr. Lavelle and he said that as we come across different compounds, that we should learn those. As they are introduced we should become responsible for them.
by Sarah_Kremer_1A
Thu Oct 06, 2016 10:34 pm
Forum: Student Social/Study Group
Topic: Sunset Village Study Group
Replies: 17
Views: 1395

Re: Sunset Village Study Group

I am in Canyon Point A1 and I would like to sometimes join! Some group studying might be beneficial closer to midterms
by Sarah_Kremer_1A
Thu Sep 29, 2016 9:37 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 113
Views: 36306

Re: Rusty on High School Chem [ENDORSED]

I have the same problem! I haven't taken Chemistry since my sophomore year in high school. I found working through ALL of the fundamental homework problems to be very beneficial. It triggered my memory of some concepts I learned in high school and also reminded me of concepts that I had struggled wi...

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