Search found 17 matches

by Megan FitzPatrick 1C
Sat Mar 12, 2016 2:50 pm
Forum: *Alkanes
Topic: Question on Alphabetizing Substituents
Replies: 1
Views: 261

Question on Alphabetizing Substituents

For the first prep quiz for Quiz 3, the answer for question 2 (page 43 of workbook) is listed as 2,2,4 trimethyl-3-ethylpentane. Why does the trimethyl come before the ethyl if the "e" in ethyl precedes the "m" in methyl alphabetically? Shouldn't it be 3-ethyl 2,2,4 trimethylpent...
by Megan FitzPatrick 1C
Sat Mar 12, 2016 2:39 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: What is A in the Arrhenius equation?
Replies: 2
Views: 459

Re: What is A in the Arrhenius equation?

In the first prep quiz for quiz 2, question 10 (page 30 of the workbook) says "for the reaction HO(g)+H2(g)-->H2O(g)+H(g), a plot of lnk versus 1/T gives a straight line with a slope equal to -5.1x10^3K. What is the activation energy for the reaction?". Since it's asking for Ea, I get that...
by Megan FitzPatrick 1C
Mon Mar 07, 2016 7:57 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Bond Angle Strain vs. Torsional Strain
Replies: 8
Views: 1458

Re: Bond Angle Strain vs. Torsional Strain

I am pretty sure the answer is yes, as long as the molecule is made up of neighboring carbons with hydrogens that eclipse (overlap in space).
by Megan FitzPatrick 1C
Sun Mar 06, 2016 10:39 pm
Forum: *Alkanes
Topic: amyl
Replies: 1
Views: 356

Re: amyl

Yes, they are interchangeable. Pentyl is the prefix you would use if asked for the IUPAC name, while amyl is what would be used for the common name.
by Megan FitzPatrick 1C
Sun Feb 28, 2016 10:08 pm
Forum: *Alkanes
Topic: Including Subsituents in Naming?
Replies: 2
Views: 355

Including Subsituents in Naming?

In one of the examples in class, we named an organic compound on page 97 of the course reader 4 methyl 5 (2methylpropyl) nonane . When you are naming the compound, is the reason you put the 4 methyl first because you ignore the substituent when naming (and the M in methyl comes before the N in nonan...
by Megan FitzPatrick 1C
Sun Feb 21, 2016 11:32 pm
Forum: *Nucleophiles
Topic: Hard/Soft Nucleophiles
Replies: 1
Views: 1622

Hard/Soft Nucleophiles

How does one distinguish between a hard and a soft nucleophile? What makes it easier for hard nucleophiles to react with hard electrophiles, and soft nucleophiles to react with soft electrophiles?
by Megan FitzPatrick 1C
Mon Feb 15, 2016 1:07 pm
Forum: General Rate Laws
Topic: Rate constants and straight line fit
Replies: 1
Views: 352

Rate constants and straight line fit

On page 67 of the course reader, it says "if straight line fit to data then 2nd order rxn with slope=k," but on the next page it says "if straight line fit to data then zero order rxn with slope=-k". Can someone explain how these rules apply in terms of an actual problem, like qu...
by Megan FitzPatrick 1C
Sun Feb 07, 2016 1:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 2007 MT Question 1
Replies: 1
Views: 289

2007 MT Question 1

Can someone walk me through how you get C as the answer for question 1 on the 2007 midterm?
The questions asks which of the following calculations will give deltaH for the process A-->2C+E, given the following:
1. A-->2B deltaH1
2. B-->C+D deltaH2
3. E-->2D deltaH3
Thanks!
by Megan FitzPatrick 1C
Tue Jan 26, 2016 7:21 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Practice Quiz #1 Question
Replies: 1
Views: 318

Practice Quiz #1 Question

On question #11 of the first practice quiz, why do we switch the sign on the value of work calculated in Step 1 (-158J) to positive in the second step of the problem?
by Megan FitzPatrick 1C
Sun Jan 24, 2016 5:30 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Reversible vs Irreversible Process
Replies: 2
Views: 443

Re: Reversible vs Irreversible Process

I believe the reversible process has constant pressure because on page 24 of the course reader, it says "since the system is at equilibrium it is a reversible process" and a couple of lines above that "if the system is at equilibrium (Pinternal=Pexternal) , then deltaVi changes infini...
by Megan FitzPatrick 1C
Sun Jan 17, 2016 9:07 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: pressure units
Replies: 2
Views: 357

Re: pressure units

No, they are not the same. Atm refers to the weight exerted by the atmosphere on one unit of surface area, while barr refers to the atmospheric pressure at sea level. Torr is pressure on an absolute scale and has pretty much always been known to equal one millimeter of mercury. As far as conversions...
by Megan FitzPatrick 1C
Sat Jan 09, 2016 2:38 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Questions about HW Problem 8.25
Replies: 1
Views: 351

Questions about HW Problem 8.25

For question 8.25 in the homework, I have a couple of questions. -By looking at the solutions manual, I saw that the change in temperature was 7.32K for the first equation (C=q/deltaT). Since the problem gives the temperature in degrees Celsius, why do we not add 273K to the temperature given in Cel...
by Megan FitzPatrick 1C
Tue Dec 01, 2015 9:46 pm
Forum: DeBroglie Equation
Topic: Video: DeBroglie Equation
Replies: 3
Views: 528

Video: DeBroglie Equation

Here is my video on the DeBroglie equation.
by Megan FitzPatrick 1C
Wed Nov 04, 2015 11:53 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Finding minimum uncertainty in velocity
Replies: 2
Views: 7223

Re: Finding minimum uncertainty in velocity

This problem uses the Heisenberg Indeterminacy equation. 1. The first step would be to convert the radius (which is in pm) to m. 150pm=150x10^-12m 2. Next you’d have to multiply the radius by 2 because delta x refers to the nuclear diameter (and nuclear radius is only half of the total uncertainty)....
by Megan FitzPatrick 1C
Wed Nov 04, 2015 8:32 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Drawing MO Energy Diagrams
Replies: 3
Views: 485

Drawing MO Energy Diagrams

When you're using molecular orbital theory to find bond length and you have a molecule with two different atoms, what determines the placement of the atomic orbitals for each atom? I was told one atom's s and p orbitals should be higher than the other one's s and p orbitals when you're drawing the M...
by Megan FitzPatrick 1C
Wed Oct 28, 2015 8:39 am
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 4
Views: 1024

Sigma and Pi Bonds

When you are going about finding the number of sigma and pi bonds in a molecule, do you always have to draw the Lewis structure for that particular molecule to determine which elements have single (sigma), double (sigma+1pi), and triple bonds (sigma+2pi bonds)? Also, I read online that only period t...
by Megan FitzPatrick 1C
Tue Oct 20, 2015 10:33 pm
Forum: Student Social/Study Group
Topic: Top of the Hill Study Group
Replies: 5
Views: 1029

Re: Top of the Hill Study Group

I know this is an old post, but if anyone wants to meet up to study for Quiz #2 let me know! I live in Hedrick Hall.

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