Search found 23 matches

by Catherine_Zhang_1H
Sun Mar 19, 2017 11:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 200
Views: 44159

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.
by Catherine_Zhang_1H
Tue Mar 07, 2017 8:58 pm
Forum: *Ethers
Topic: Course reader pg 94
Replies: 2
Views: 446

Course reader pg 94

For the common names, could someone re-explain the naming of CH3-O-CH2CH3? (Ethyl methyl ether)
by Catherine_Zhang_1H
Sun Mar 05, 2017 7:20 pm
Forum: *Alkanes
Topic: Using common names
Replies: 1
Views: 152

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?
by Catherine_Zhang_1H
Sun Feb 26, 2017 8:36 pm
Forum: *Alkanes
Topic: Nucleophile vs Electrophile
Replies: 2
Views: 233

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...
by Catherine_Zhang_1H
Sun Feb 19, 2017 11:07 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Mechanisms
Replies: 2
Views: 284

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...
by Catherine_Zhang_1H
Sun Feb 12, 2017 11:54 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: What is n? [ENDORSED]
Replies: 8
Views: 731

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.
by Catherine_Zhang_1H
Sun Feb 12, 2017 11:43 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G vs Delta G0
Replies: 5
Views: 1290

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...
by Catherine_Zhang_1H
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: 398

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.
by Catherine_Zhang_1H
Sun Jan 29, 2017 6:22 pm
Forum: Phase Changes & Related Calculations
Topic: Open, Closed, and Isolated Systems
Replies: 8
Views: 575

Re: Open, Closed, and Isolated Systems

What about bomb calorimeters? (Mentioned in 8.1) What are they and why are they isolated systems?
by Catherine_Zhang_1H
Sun Jan 29, 2017 6:18 pm
Forum: Phase Changes & Related Calculations
Topic: Quiz 1
Replies: 11
Views: 836

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.
by Catherine_Zhang_1H
Mon Jan 23, 2017 12:53 am
Forum: Phase Changes & Related Calculations
Topic: Open, Closed, and Isolated Systems
Replies: 8
Views: 575

Re: Open, Closed, and Isolated Systems

Additional question, what type if system is a constant pressure calorimeter?
by Catherine_Zhang_1H
Mon Jan 23, 2017 12:51 am
Forum: Phase Changes & Related Calculations
Topic: Study Group
Replies: 7
Views: 535

Re: Study Group

Definitely interested!
by Catherine_Zhang_1H
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: 175

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
by Catherine_Zhang_1H
Sat Dec 03, 2016 2:27 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Using mmols
Replies: 1
Views: 416

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...
by Catherine_Zhang_1H
Sun Nov 20, 2016 10:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp
Replies: 6
Views: 661

Re: Kp

Do we have to know how to convert between Kp and Kc?
by Catherine_Zhang_1H
Sun Nov 13, 2016 10:36 pm
Forum: Naming
Topic: Shape
Replies: 2
Views: 193

Shape

Can someone clarify how to determine the shapes of coordination compounds? Like the difference between a tetrahedral complex and a square planar complex?
by Catherine_Zhang_1H
Sun Nov 13, 2016 10:33 pm
Forum: Naming
Topic: Negative charge
Replies: 1
Views: 181

Negative charge

Are there some metals that do not follow the adding -ate to the end of the name rule? For example, vanadium?
by Catherine_Zhang_1H
Sun Nov 06, 2016 3:01 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order?
Replies: 5
Views: 514

Re: Bond Order?

So bond orders that aren't integers would signify resonance?
by Catherine_Zhang_1H
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: 7452

Re: Chem 14A Midterm Fall 2016 Rooms & Review Sessions

What sort of questions would come from Chemistry Community on the midterm?
by Catherine_Zhang_1H
Sun Oct 23, 2016 1:52 pm
Forum: Hybridization
Topic: Labeling p orbital
Replies: 1
Views: 181

Labeling p orbital

When would we have to label the three p orbitals using x,y, and z?
by Catherine_Zhang_1H
Sun Oct 16, 2016 5:56 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Radius
Replies: 2
Views: 240

Ionic Radius

How are ionic radii measured since they involve two different elements?
by Catherine_Zhang_1H
Sun Oct 09, 2016 3:45 pm
Forum: *Black Body Radiation
Topic: black body radiation
Replies: 1
Views: 358

black body radiation

How does black body radiation relate to the photoelectric effect?
by Catherine_Zhang_1H
Fri Sep 30, 2016 8:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Empirical Equations
Replies: 1
Views: 245

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...

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