Search found 21 matches
- Sun Mar 19, 2017 12:14 pm
- Forum: *Cycloalkanes
- Topic: Naming Cycloalkanes
- Replies: 2
- Views: 1471
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: 1946
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: 955
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: 744
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: 759
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: 648
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: 1549
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: 23573
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: 419
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!
Thank you!
- Sun Jan 29, 2017 5:09 pm
- Forum: Phase Changes & Related Calculations
- Topic: Derivations
- Replies: 2
- Views: 475
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: 623
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: 648
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: 3052
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: 764
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: 782
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: 2318
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: 1281
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: 9651
- Views: 2759866
Re: Post All Chemistry Jokes Here
What do you call a clown who is in jail?
A silicon.
A silicon.
- Fri Oct 14, 2016 4:14 pm
- Forum: Properties of Light
- Topic: QUIZ 1 [ENDORSED]
- Replies: 7
- Views: 1604
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: 3445
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: 347
- Views: 410501
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...