## Search found 21 matches

Sun Mar 19, 2017 12:14 pm
Forum: *Cycloalkanes
Topic: Naming Cycloalkanes
Replies: 2
Views: 753

### 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.
Sun Mar 19, 2017 12:13 pm
Forum: *Calculations Using ΔG° = -RT ln K
Topic: Arrhenius Graphs
Replies: 3
Views: 1103

### 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.
Sun Mar 19, 2017 10:47 am
Forum: General Rate Laws
Topic: pre equilibrium
Replies: 4
Views: 636

### 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).
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: 464

### 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!
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: 456

### 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.
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: 440

### Re: Nernst Equation

the temperature should be in kelvin, since other constants use kelvin.
Sat Mar 18, 2017 10:37 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Bonds
Replies: 4
Views: 822

### Re: Bonds

Furthermore, the substituents generally have equatorial (horizontal) bonds while the hydrogens have axial bonds.
Mon Feb 20, 2017 1:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 17123

### 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
Sat Feb 11, 2017 3:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Review Session
Replies: 1
Views: 250

### 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!
Sun Jan 29, 2017 5:09 pm
Forum: Phase Changes & Related Calculations
Topic: Derivations
Replies: 2
Views: 272

### Derivations

Will we have to know how to derive the equations we derived in class for the quiz?
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: 377

### 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.
Sun Jan 15, 2017 10:23 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Which method to pick [ENDORSED]
Replies: 2
Views: 469

### 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.
Sun Nov 27, 2016 3:36 pm
Forum: Polyprotic Acids & Bases
Topic: Finding the K Overall [ENDORSED]
Replies: 3
Views: 2039

### Re: Finding the K Overall[ENDORSED]

And this only applies to polyprotic acids, since they have more than one K values
Sun Nov 27, 2016 3:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam [ENDORSED]
Replies: 2
Views: 558

### 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?
Thu Nov 10, 2016 2:59 pm
Forum: Naming
Topic: Table of all the ligand names
Replies: 3
Views: 485

### 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...
Fri Nov 04, 2016 12:53 pm
Forum: Hybridization
Topic: Polar vs Non polar
Replies: 5
Views: 1261

### 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...
Fri Oct 28, 2016 11:34 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Midterm
Replies: 9
Views: 872

### 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.
Fri Oct 21, 2016 4:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409241

### Re: Post All Chemistry Jokes Here

What do you call a clown who is in jail?
A silicon.
Fri Oct 14, 2016 4:14 pm
Forum: Properties of Light
Topic: QUIZ 1 [ENDORSED]
Replies: 7
Views: 1067

### 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.
Thu Oct 06, 2016 10:34 pm
Forum: Student Social/Study Group
Topic: Sunset Village Study Group
Replies: 17
Views: 1928

### 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
Thu Sep 29, 2016 9:37 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 198
Views: 139063

### 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...