Search found 8 matches

by Shannon Cavanaugh 1I
Sun Mar 13, 2016 9:21 am
Forum: *Electrophilic Addition
Topic: Quiz 3 preparation #5 - 2 intermediates
Replies: 1
Views: 406

Quiz 3 preparation #5 - 2 intermediates

In the workbook Quiz 3 preparation number 5: For the electrophilic addition reaction of (cholesterol + HBr), if 2 steps are involved and 2 transition states why are there 2 intermediates? Why isn't it: cholesterol + HBr -->TS--> cholesterol-H + Br- -->TS--> cholesterol-H-Br with one intermediate?
by Shannon Cavanaugh 1I
Sun Mar 06, 2016 4:33 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis or trans in long chains
Replies: 2
Views: 567

Re: Cis or trans in long chains

Dr. Lavelle described it as: "are long Carbon chains on the opposite or same side (of the double bond)?" 3,6-dimethyl-3-octene is a TRANS geometric isomer because the "long Carbon chains" are the 3-Carbon chain left of the double bond and the 5-Carbon chain right of the double bo...
by Shannon Cavanaugh 1I
Sun Feb 28, 2016 8:46 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Sec
Replies: 1
Views: 363

Re: Sec

from: http://www.chem.ucla.edu/harding/IGOC/C/common_name.html"onclick="window.open(this.href);return false; The prefix "sec" or "s" is used when the functional group is bonded to a secondary carbon. This prefix is only useful for a four-carbon chain. It is not applicable with a ...
by Shannon Cavanaugh 1I
Mon Feb 15, 2016 11:18 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 content
Replies: 2
Views: 435

Quiz 2 content

Are quizzes cumulative (will cover material from quiz 1 (thermochemistry) and the midterm (electrochemistry))? Or can we assume that quiz 2 will be focused on kinetics? Thanks.
by Shannon Cavanaugh 1I
Sun Jan 31, 2016 3:53 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: K
Replies: 2
Views: 465

Re: K

"K" could be referring to the equilibrium constant (K) used when dealing with chemical reactions at equilibrium or figuring out which direction (forward or reverse) is favored in a reaction.

aA+bB⇌cC+dD

Keq=([C]^c[D]^d)/([A]^a[B]^b)
by Shannon Cavanaugh 1I
Sun Jan 24, 2016 1:36 pm
Forum: Phase Changes & Related Calculations
Topic: Variable "L" for Phase Change calculations
Replies: 1
Views: 314

Variable "L" for Phase Change calculations

What does the variable "L" refer to with regard to phase change calculations?
ex: L(subscript)fusion=6.01 kJ/mol
Is this value used when phase is changing (horizontal line on graph when temperature remains constant but energy increases)?
by Shannon Cavanaugh 1I
Sun Jan 17, 2016 12:19 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: degeneracy and energy
Replies: 2
Views: 309

Re: degeneracy and energy

All the microstates (arrangements of molecules in the flask) have the same energy because the Left and Right sides of the flask have "equivalent (same energy) states," meaning the arrangement of the molecules does not affect the total amount of energy (as long as the number of total molecu...
by Shannon Cavanaugh 1I
Sat Jan 09, 2016 4:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: calculate delta H in a RXN
Replies: 1
Views: 310

Re: calculate delta H in a RXN

Standard RXN Enthalpy = (Sum of Standard enthalpy of formation for PRODUCTS) - (Sum of Standard enthalpy of formation for REACTANTS)
This equation is used to find standard RXN enthalpy when bond enthalpies are not available, just (deltaHf*).

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