Search found 14 matches

by Jordan Pace 2B
Wed Mar 15, 2017 12:44 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair conformation
Replies: 4
Views: 454

Re: Chair conformation

To add to the comment above, I know a ring flip changes whatever is axial to equatorial, but is there more to it? What's the significance of this?
by Jordan Pace 2B
Wed Mar 15, 2017 12:43 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair conformation
Replies: 4
Views: 454

Re: Chair conformation

For clarity, what exactly is a ring flip? I have heard the term used multiple times but I'm not exactly sure what it means! Thanks in advance!
by Jordan Pace 2B
Mon Mar 13, 2017 4:08 pm
Forum: *ChemDraw
Topic: steric strain
Replies: 2
Views: 713

Re: steric strain

Strain in general is when a molecule is less stable due to electron repulsion or when it is not in its ideal geometry. Steric strain is the increase in potential energy of a molecule due to repulsion between electrons in atoms.
by Jordan Pace 2B
Sun Mar 12, 2017 5:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 209
Views: 97941

Re: Saying Thank You to Dr. Lavelle

After an abrupt awakening from 14A, I had no idea what to expect coming into this quarter. Now as we enter week 10, I'm ecstatic to say that I not only understand chem more than I ever have before, but I now look forward to 14C rather than dread it. Your countless resources and aids are much appreci...
by Jordan Pace 2B
Mon Mar 06, 2017 6:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15851

Re: Quiz 3 Winter 2017

In response to, "Why is the answer for #4, 4-butyl-1,2-dimethylcyclohexane and not 1,2-dimethyl,4-butylcyclohexane? When naming a compound, do the lower numbers go first?" You list different substituents alphabetically, not based on the numbers. In this example, butyl comes before methyl b...
by Jordan Pace 2B
Mon Feb 27, 2017 2:34 pm
Forum: *Alkanes
Topic: How to Name
Replies: 3
Views: 1246

Re: How to Name

How would you name the last example from lecture today:

CH3
|
CH3-CH-CH2-CH2-CH2-CH3

Please explain! I know the methyl group is involved but not sure how! Thank you!
by Jordan Pace 2B
Mon Feb 27, 2017 2:18 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Determining Where Hydrogen Bonds
Replies: 5
Views: 604

Re: Determining Where Hydrogen Bonds

Is the explanation above the reason why the curved arrows point from the pi-double bond to the H and why another curved arrow points from the single bond to the Br? I'm not completely sure what the arrows represent. Do the arrows just represent bonds being broken and the transfer of electrons?
by Jordan Pace 2B
Tue Feb 21, 2017 10:21 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15294

Re: Quiz 2 Winter 2017

For #11: I'm not 100% sure this is how to approach this problem, but this is what a friend and I did to solve it! ln k2/k1= Ea/8.314 [1/T1 - 1/T2] k2=35 min^-1 k1=25 min^-1 T1=298 T2=350 Solve for Ea 0.336= 0.000498Ea/8.314 Ea=5617.3 Now find rate constant at 770K ln x/25= 5617.3/8.314 [1/298 - 1/77...
by Jordan Pace 2B
Fri Feb 17, 2017 4:20 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Confusion about intermediates
Replies: 4
Views: 386

Re: Confusion about intermediates

As stated above, most chemical reactions are stepwise. For clarity, a stepwise reaction is a chemical reaction with one or more reaction intermediates and involves at least two consecutive elementary reactions. An intermediate is formed from the reactants or preceding intermediates and reacts to pro...
by Jordan Pace 2B
Fri Feb 10, 2017 12:00 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reaction with Hydrogens
Replies: 3
Views: 280

Re: Balancing Redox Reaction with Hydrogens

My TA gave us a list of steps for how to balance redox reactions! Step 1: Write the skeletons of the half-reactions Step 2: Balance all elements other than H and O Step 3: Balance O by adding H2O to the side without O Step 4: Balance H by adding H+ to the side without H Step 5: Balance charges by ad...
by Jordan Pace 2B
Thu Feb 02, 2017 2:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Battery Cell
Replies: 1
Views: 265

Re: Battery Cell

I didn't completely understand the purpose of a salt bridge at first either! Recall that the electrons flow from the anode to the cathode.The anode side (oxidation half-reaction) is producing Zn2+ ions and Cu2+ ions on the cathode side (reduction half-reaction) are being used up. The salt bridge ser...
by Jordan Pace 2B
Sat Jan 28, 2017 10:14 pm
Forum: Phase Changes & Related Calculations
Topic: Quiz 1
Replies: 11
Views: 940

Re: Quiz 1

From what I've heard, quiz 1 is very calculation heavy. Doing the recommended problems in the textbook and the practice quiz in the course reader should definitely help! Make sure to be familiar with all of the equations discussed in class/used in chapter 8, 9, and the 11!
by Jordan Pace 2B
Sun Jan 22, 2017 7:16 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Boltzmann Equation [ENDORSED]
Replies: 1
Views: 239

Re: Boltzmann Equation [ENDORSED]

Entropy (S) is logarithmically related to the degeneracy (W). Using the equation S=Kb ln W makes the "large" error not so significant. Dr. Lavelle used the example of taking the natural log of both 1 million and 1,050,000 million, which seems like a large error but actually have very simil...
by Jordan Pace 2B
Fri Jan 13, 2017 8:19 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: State Property Difference
Replies: 2
Views: 294

Re: State Property Difference

State functions, such as temperature and pressure, have values that do not depend on the path taken to reach that specific value. For state functions, you just need to know the final value and the initial value. Work is not a state function because it is dependent on the path used to go from the ini...

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