## Search found 22 matches

Sat Mar 18, 2017 8:15 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Finding n
Replies: 1
Views: 375

### Finding n

Hi, so I know that n is defined as the number of electrons transferred in a reaction, but do you have to write out each half rxn to figure this out? Thanks!
Wed Mar 15, 2017 8:54 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Hexane and Hectane
Replies: 1
Views: 330

### Re: Hexane and Hectane

I think you probably would get marked off since hexane has 6 C and hectare has 7. ):
Sun Mar 05, 2017 12:54 am
Forum: *Organic Reaction Mechanisms in General
Topic: Arrows
Replies: 4
Views: 515

### Re: Arrows

The electrons are transferred from the bond that is broken, so you want to have the arrow pointing from the bond being broken to the element receiving the electrons (electrophile).
Thu Mar 02, 2017 10:38 am
Forum: Administrative Questions and Class Announcements
Replies: 6
Views: 821

### Re: Quiz 3 Prep answers

He usually posts them Sunday or Monday night right before the first quizzes!
Sat Feb 25, 2017 5:10 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Heterogeneous Catalysts [ENDORSED]
Replies: 1
Views: 284

### Heterogeneous Catalysts[ENDORSED]

Hi, so I remember Dr. Lavelle briefly mentioning heterogeneous catalysts, but I was wondering if anyone could give an example of heterogeneous catalysts because I was a little confused about them? Thanks!
Mon Feb 20, 2017 12:32 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Equation Approaches
Replies: 1
Views: 304

### Equation Approaches

Could someone explain the general difference between steady-state and pre-equilibrium approaches? I know if used correctly they give the same result, but when is it better to use one or the other?
Sat Feb 11, 2017 9:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Has the formula sheet changed?
Replies: 3
Views: 628

### Re: Has the formula sheet changed?

Also, I believe the laminated formula sheet for F forgot a decimal point. I believe it should be 96485.3, not 964853. I'm pretty sure the formula sheet given by Dr. Lavelle on quizzes had the correct conversion, however.
Tue Feb 07, 2017 1:06 am
Forum: Student Social/Study Group
Topic: Study group for mid term
Replies: 4
Views: 762

### Re: Study group for mid term

Hi, what day were you planning on meeting?
Sun Jan 29, 2017 2:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Discussion Section
Replies: 2
Views: 449

### Re: Discussion Section

Yes it was, thank you so much for your concern.
Fri Jan 20, 2017 10:55 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Piston Diagram [ENDORSED]
Replies: 1
Views: 292

### Piston Diagram[ENDORSED]

Hi, for the visual diagram provided on p.9 of the course reader, could someone explain what the surface area is referring to, and how that relates to a volume change? Thanks!
Mon Jan 09, 2017 10:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Discussion Section
Replies: 2
Views: 449

### Discussion Section

Hi, I am currently enrolled in discussion 3C (Tues, 4:00-4:50PM) but I have a time conflict with a different lecture. Would anyone in 3B, 3E, 3L, 3N, or 3O be willing to switch? Thanks so much!
Wed Nov 30, 2016 8:45 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO theory and Bond Order
Replies: 1
Views: 347

### Re: MO theory and Bond Order

He2 is not stable because if you calculate the bond order it would be 1/2(2-2) = 0, meaning it's extremely unstable.
Tue Nov 22, 2016 10:53 am
Forum: Bronsted Acids & Bases
Topic: KA VS KB
Replies: 2
Views: 458

### Re: KA VS KB

Yes, Ka is used to represent the equilibrium constant for acids, and Kb represents the equ. constant for bases. The equations you use to find equ. constant is exactly the same for both Ka and Kb, just the actual quantity of the constants differ.
Mon Nov 14, 2016 10:06 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How do you find the number of attachment possible?
Replies: 3
Views: 508

### Re: How do you find the number of attachment possible?

Does this mean that whenever en is used you count it as 2 coordination numbers? Also, is dien also 2?
Tue Nov 08, 2016 9:38 pm
Forum: Naming
Topic: Naming Compounds
Replies: 2
Views: 366

### Naming Compounds

For quiz 3/the final, will we need to know the Latin names of certain transition metals (i.e.: Ferrate)? It's not in the course reader but the example we had in discussion used it.
Tue Nov 01, 2016 11:38 am
Forum: Administrative Questions and Class Announcements
Topic: Chem 14A Midterm Fall 2016 Rooms & Review Sessions
Replies: 16
Views: 8097

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

I noticed that sometimes the constant values given in our notes/course reader does not exactly match the laminated periodic table we received with the course reader. For example, h=6.626E-34 in our reader but is more specifically stated as h=6.62608E-34 on the periodic table Also c=3.00E8 vs c=2.99...
Tue Oct 25, 2016 9:56 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: chapter 3 #13B
Replies: 2
Views: 346

### Re: chapter 3 #13B

It is because half-filled orbitals are more stable. This goes along with the electron configuration exceptions (i.e. Cr and Cu).
Wed Oct 19, 2016 1:14 pm
Forum: Ionic & Covalent Bonds
Topic: Base Notation [ENDORSED]
Replies: 2
Views: 423

### Base Notation[ENDORSED]

For NH3, the element is denoted with 2 vertical dots on its left. Does this just denote that it is a base? I was a little confused if this notation is supposed to apply to all bases, because other elements (F-, OH) don't have that dot notation.
Thu Oct 13, 2016 1:44 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Significant Figures
Replies: 4
Views: 636

### Re: Significant Figures

Wait, but when we use significant figures, we are supposed to take that of the number with the least significant figures, so shouldn't it just be one significant figure adapted from the n=3? Or does that just not count?
Thu Oct 06, 2016 12:19 pm
Forum: Photoelectric Effect
Topic: Work Function and Threshold Energy [ENDORSED]
Replies: 3
Views: 2607

### Re: Work Function and Threshold Energy[ENDORSED]

Work function and threshold energy do have slight differences, but in the chem course reader Professor Lavelle used them interchangeably when describing an equation.
Fri Sep 30, 2016 1:59 pm
Forum: Properties of Light
Replies: 2
Views: 523

From what Professor Lavelle mentioned, we won't really need to use black body radiation regularly, I believe. However, black bodies are just a hypothetical term for materials that absorb all frequencies (but no material actually does this). It was just mentioned as a contrast to atoms since, unlike ...
Fri Sep 30, 2016 1:53 pm
Forum: Student Social/Study Group
Topic: Saxon Study Group
Replies: 36
Views: 3471

### Re: Saxon Study Group

Hi, I'm guessing I missed the meeting, but I would also like to join! Did you decide on a time to study?