Search found 23 matches
- Sun Mar 19, 2017 11:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 513520
Re: Saying Thank You to Dr. Lavelle
Thank you Dr. Lavelle for a fun two quarters! The extra effort you put into offering so many resources to us is much appreciated and so helpful for 14A and 14B! I've learned a lot from these classes and I'll definitely be prepared for 14C.
- Tue Mar 07, 2017 8:58 pm
- Forum: *Ethers
- Topic: Course reader pg 94
- Replies: 2
- Views: 1393
Course reader pg 94
For the common names, could someone re-explain the naming of CH3-O-CH2CH3? (Ethyl methyl ether)
- Sun Mar 05, 2017 7:20 pm
- Forum: *Alkanes
- Topic: Using common names
- Replies: 1
- Views: 367
Using common names
When do we know when to use common names? I know Lavelle said for substituents but how familiar should we be in knowing them and what should indicate whether we use IUPAC or the common name for substituents?
- Sun Feb 26, 2017 8:36 pm
- Forum: *Alkanes
- Topic: Nucleophile vs Electrophile
- Replies: 2
- Views: 568
Re: Nucleophile vs Electrophile
I would say it is good to know the list, but sometimes you can tell based on the structure of the molecule (i.e. if it has a very electronegative element, if there's a double/triple bonds with the pi bonds). If something has a partially positive charge=electrophile and partially negative charge=nucl...
- Sun Feb 19, 2017 11:07 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Mechanisms
- Replies: 2
- Views: 591
Re: Mechanisms
Hi, you can tell something is an intermediate when it is formed and then used in a reaction and doesn't appear in the overall reaction. Formations of intermediates are usually the slow step, which determines the rate law so intermediates are essential in solving for the rate laws. Sometimes the rate...
- Sun Feb 12, 2017 11:54 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: What is n? [ENDORSED]
- Replies: 8
- Views: 1834
Re: What is n? [ENDORSED]
If you're just looking to calculate and solve that equation, an easy way to think of it would be the number of electrons transferred in the redox reaction. That value would be n.
- Sun Feb 12, 2017 11:43 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G vs Delta G0
- Replies: 5
- Views: 7817
Re: Delta G vs Delta G0
The naught sign means that the substance is in standard state so delta g naught would be calculated using standard enthalpy of formation and standard entropy values. You can find the standard enthalpy of formation of the reaction by doing sum of the standard enthalpy of formation of products - react...
- Sun Feb 05, 2017 11:42 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Number of mols to use in the equation [ENDORSED]
- Replies: 3
- Views: 840
Re: Number of mols to use in the equation [ENDORSED]
A shortcut would be to look at the number of electrons that will be transferred. If you can calculate that without doing the full redox reaction that would work but I'm guessing that the problem will probably involve the redox reaction anyways. So there's no harm calculating it.
- Sun Jan 29, 2017 6:22 pm
- Forum: Phase Changes & Related Calculations
- Topic: Open, Closed, and Isolated Systems
- Replies: 8
- Views: 3161
Re: Open, Closed, and Isolated Systems
What about bomb calorimeters? (Mentioned in 8.1) What are they and why are they isolated systems?
- Sun Jan 29, 2017 6:18 pm
- Forum: Phase Changes & Related Calculations
- Topic: Quiz 1
- Replies: 11
- Views: 1908
Re: Quiz 1
The answers are already posted, and they are just numerical but you can ask on Chemistry Community for solutions or in office hours/peer facilitated learning sessions, which I find helpful.
- Mon Jan 23, 2017 12:53 am
- Forum: Phase Changes & Related Calculations
- Topic: Open, Closed, and Isolated Systems
- Replies: 8
- Views: 3161
Re: Open, Closed, and Isolated Systems
Additional question, what type if system is a constant pressure calorimeter?
- Mon Jan 23, 2017 12:51 am
- Forum: Phase Changes & Related Calculations
- Topic: Study Group
- Replies: 7
- Views: 1394
Re: Study Group
Definitely interested!
- Mon Jan 16, 2017 11:26 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Difference between Cp and Cv
- Replies: 1
- Views: 524
Difference between Cp and Cv
I'm having trouble understanding why there is only a difference in gases between Cp and Cv and how that would affect how to solve a problem (like would we have to distinguish which one should be used?) if someone could help out. Thanks
- Sat Dec 03, 2016 2:27 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Using mmols
- Replies: 1
- Views: 946
Using mmols
Can we solve a problem using an ICE chart and millimols when trying to find the change in pH of a buffer solution after adding a strong acid or base? For example, problem 13.11 that asks you to find the new pH after adding 20 mL of 0.100 M HNO3 to a buffer solution of 100 mL of 0.100M CH3COOH AND 10...
- Sun Nov 20, 2016 10:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp
- Replies: 6
- Views: 3470
Re: Kp
Do we have to know how to convert between Kp and Kc?
Shape
Can someone clarify how to determine the shapes of coordination compounds? Like the difference between a tetrahedral complex and a square planar complex?
- Sun Nov 13, 2016 10:33 pm
- Forum: Naming
- Topic: Negative charge
- Replies: 1
- Views: 390
Negative charge
Are there some metals that do not follow the adding -ate to the end of the name rule? For example, vanadium?
- Sun Nov 06, 2016 3:01 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order?
- Replies: 5
- Views: 1061
Re: Bond Order?
So bond orders that aren't integers would signify resonance?
- Mon Oct 31, 2016 11:04 am
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14A Midterm Fall 2016 Rooms & Review Sessions
- Replies: 16
- Views: 9302
Re: Chem 14A Midterm Fall 2016 Rooms & Review Sessions
What sort of questions would come from Chemistry Community on the midterm?
- Sun Oct 23, 2016 1:52 pm
- Forum: Hybridization
- Topic: Labeling p orbital
- Replies: 1
- Views: 411
Labeling p orbital
When would we have to label the three p orbitals using x,y, and z?
- Sun Oct 16, 2016 5:56 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Radius
- Replies: 2
- Views: 554
Ionic Radius
How are ionic radii measured since they involve two different elements?
- Sun Oct 09, 2016 3:45 pm
- Forum: *Black Body Radiation
- Topic: black body radiation
- Replies: 1
- Views: 631
black body radiation
How does black body radiation relate to the photoelectric effect?
- Fri Sep 30, 2016 8:26 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Empirical Equations
- Replies: 1
- Views: 531
Re: Empirical Equations
That particular equation was based off of experimental data on hydrogen, so it only works for hydrogen which has one electron and no electron repulsion. I think there is another equation related to that one called the Z-dependent Rydberg relation that works for atoms such as He+ that also only conta...