CHEMISTRY COMMUNITY

Catherine_Zhang_1H

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.

Catherine_Zhang_1H

For the common names, could someone re-explain the naming of CH3-O-CH2CH3? (Ethyl methyl ether)

Catherine_Zhang_1H

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?

Catherine_Zhang_1H

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...

Catherine_Zhang_1H

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...

Catherine_Zhang_1H

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.

Catherine_Zhang_1H

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...

Catherine_Zhang_1H

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.

Catherine_Zhang_1H

What about bomb calorimeters? (Mentioned in 8.1) What are they and why are they isolated systems?

Catherine_Zhang_1H

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.

Catherine_Zhang_1H

Additional question, what type if system is a constant pressure calorimeter?

Catherine_Zhang_1H

Definitely interested!

Catherine_Zhang_1H

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

Catherine_Zhang_1H

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...

Catherine_Zhang_1H

Do we have to know how to convert between Kp and Kc?

Catherine_Zhang_1H

Can someone clarify how to determine the shapes of coordination compounds? Like the difference between a tetrahedral complex and a square planar complex?

Catherine_Zhang_1H

Are there some metals that do not follow the adding -ate to the end of the name rule? For example, vanadium?

Catherine_Zhang_1H

So bond orders that aren't integers would signify resonance?

Catherine_Zhang_1H

What sort of questions would come from Chemistry Community on the midterm?

Catherine_Zhang_1H

When would we have to label the three p orbitals using x,y, and z?

Catherine_Zhang_1H

How are ionic radii measured since they involve two different elements?

Catherine_Zhang_1H

How does black body radiation relate to the photoelectric effect?

Catherine_Zhang_1H

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...

CHEMISTRY COMMUNITY

Search found 23 matches

Re: Saying Thank You to Dr. Lavelle

Course reader pg 94

Using common names

Re: Nucleophile vs Electrophile

Re: Mechanisms

Re: What is n? [ENDORSED]

Re: Delta G vs Delta G0

Re: Number of mols to use in the equation [ENDORSED]

Re: Open, Closed, and Isolated Systems

Re: Quiz 1

Re: Open, Closed, and Isolated Systems

Re: Study Group

Difference between Cp and Cv

Using mmols

Re: Kp

Shape

Negative charge

Re: Bond Order?

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

Labeling p orbital

Ionic Radius

black body radiation

Re: Empirical Equations