Search found 19 matches

by Amanda Nguyen 2E
Mon Mar 07, 2016 12:25 pm
Forum: Calculating Work of Expansion
Topic: 2011 Midterm Q1B
Replies: 2
Views: 382

2011 Midterm Q1B

"1.00 mol of methane is combusted irreversibly at constant room temp. Calculate the work associated with this process."

Why is the change in moles -2.00? Why don't we use 1.00 mol for n?
by Amanda Nguyen 2E
Sun Mar 06, 2016 5:33 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Cycloalkanes and there conformations
Replies: 2
Views: 408

Re: Cycloalkanes and there conformations

Cycloalkanes with more than three carbons are nonplanar to relieve torsional and bond angle strain.
by Amanda Nguyen 2E
Sun Mar 06, 2016 3:53 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Staggered and eclipsed succulents
Replies: 1
Views: 312

Staggered and eclipsed succulents

My succulents reminded me of staggered and eclipsed conformations. Enjoy!
by Amanda Nguyen 2E
Tue Mar 01, 2016 3:30 pm
Forum: *Electrophilic Addition
Topic: Butene + Br2 Reaction (p. 85)
Replies: 2
Views: 747

Re: Butene + Br2 Reaction (p. 85)

Wouldn't the final product be C2H4Br2?
by Amanda Nguyen 2E
Tue Mar 01, 2016 2:03 pm
Forum: *Electrophilic Addition
Topic: Butene + Br2 Reaction (p. 85)
Replies: 2
Views: 747

Butene + Br2 Reaction (p. 85)

Please refer to pg. 85 of the course reader. Is the reaction of butene with Br2 considered an electrophilic addition reaction, since the Br2 is polarized and one Br (partial positive) acts as an electrophile? Secondly, in the reaction of butene with Br2, the product we discussed in class is CH2BrC(+...
by Amanda Nguyen 2E
Mon Feb 29, 2016 10:05 pm
Forum: *Alkanes
Topic: Neo, Iso, Tert, Sec
Replies: 2
Views: 293

Re: Neo, Iso, Tert, Sec

Edit: I'd say tert means the substituent is composed of a tertiary carbon, and sec means that the sub is composed of a secondary carbon.
by Amanda Nguyen 2E
Mon Feb 29, 2016 9:50 pm
Forum: *Alkanes
Topic: Neo, Iso, Tert, Sec
Replies: 2
Views: 293

Re: Neo, Iso, Tert, Sec

I believe that's correct. Iso means that there are 2 methyls attached to CH, Neo means that there are 3 methyls attached to a C, Sec means that the substituent is bonded to a secondary carbon (a carbon that is bonded to 2 other carbons), and tert means that the substituent is bonded to a tertiary ca...
by Amanda Nguyen 2E
Mon Feb 29, 2016 8:52 pm
Forum: *Alkanes
Topic: Quiz 3 Preparation
Replies: 34
Views: 11206

Re: Quiz 3 Preparation

Is number 2's (on the first quiz prep) IUPAC name 3-ethyl-2,2,4-trimethyl pentane and its common name 3-ethyl-2-methylneoheptane?
by Amanda Nguyen 2E
Mon Feb 29, 2016 4:12 pm
Forum: *Alkanes
Topic: Common Name vs. IUPAC name
Replies: 1
Views: 339

Common Name vs. IUPAC name

If the question doesn't specifically ask for the IUPAC name or the common name, would either name given be correct then?
by Amanda Nguyen 2E
Mon Feb 22, 2016 9:42 am
Forum: *Electrophiles
Topic: Memory Tips
Replies: 8
Views: 998

Re: Memory Tips

The way I think about it is Electrons are like the attractive mates everyone wants, but not everyone can have. "electro" = electrons and "-phile" means "loving." electrophiles love electrons, but unfortunately electrons don't love them back, so they are electron deficie...
by Amanda Nguyen 2E
Thu Feb 11, 2016 9:37 pm
Forum: General Science Questions
Topic: The start of organic chemistry
Replies: 1
Views: 311

The start of organic chemistry

What material from Chem 14A would be most useful to review in preparation for organic chemistry?
by Amanda Nguyen 2E
Sat Feb 06, 2016 4:13 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Some clarification on the "mole" unit
Replies: 1
Views: 318

Some clarification on the "mole" unit

Usually we use "n" to mean the number of moles. Some equations that use this are delta G = -nFE. How do we know when to include the "mol" unit and when not to? For example, in Ch. 14.9, delta G is in J/mol (from 2 * (C/mol) * (J/C), while in question 7B in the Winter 2011 midterm...
by Amanda Nguyen 2E
Sat Feb 06, 2016 3:55 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Winter 2011 Midterm Question 7&8 C
Replies: 1
Views: 275

Winter 2011 Midterm Question 7&8 C

The question asks what is K_eq and delta G. I first found delta G by using the eqn delta G = -n*F*E. To find K_eq, I used the equation delta G = -RT*lnK. I know R, T, and now delta G (from above), and I solved for K. First I got that lnK = 6.4x10^3 J / (8.314J/kmol * 298.15K)=2.5689, then K = e^2.56...
by Amanda Nguyen 2E
Tue Feb 02, 2016 2:14 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Course Reader pg. 41
Replies: 1
Views: 210

Course Reader pg. 41

The example asks at what temp is Br2(l) ---> Br2(g) spontaneous at 1 atm. To clarify, the question is not asking for the temp at the boiling point, right? We are solving for the temp greater than the boiling point temp, since the rxn must be spontaneous? I am confused because I have in my notes from...
by Amanda Nguyen 2E
Sun Jan 24, 2016 5:36 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Drawing Heating Curves
Replies: 2
Views: 389

Drawing Heating Curves

When drawing heating curves, the enthalpies of vaporization and fusion guide how long to make the phase change line with slope = 0 relative to the x axis and the heat capacities of solid, liquid, and gas tell you how to sketch the slope. However, how would we know how long to sketch the line corresp...
by Amanda Nguyen 2E
Mon Jan 18, 2016 11:27 am
Forum: Phase Changes & Related Calculations
Topic: 8.31 and 8.39
Replies: 1
Views: 293

8.31 and 8.39

8.31a is asking to calculate the q_p. I used the equation q_p = delta H = n * C_p,m * deltaT. We know that C_p,m = (5/2)R for Kr. So my calculation looks like: 5.025g Kr * 1mol / 83.80g Kr * (5/2) * 8.314 J/kmol * ((25.0 - 97.6 celsius) + 273). In the solutions manual, I do not understand why they d...
by Amanda Nguyen 2E
Mon Jan 11, 2016 3:27 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7860
Views: 1099512

Chemistry Jokes

I told a chemistry joke...

There was no reaction!
by Amanda Nguyen 2E
Fri Jan 08, 2016 11:54 pm
Forum: Administrative Questions and Class Announcements
Topic: 5th edition of textbook
Replies: 2
Views: 568

Re: 5th edition of textbook

So are the homework problems different? Do you recommend I purchase the sixth edition?
by Amanda Nguyen 2E
Fri Jan 08, 2016 6:54 pm
Forum: Administrative Questions and Class Announcements
Topic: 5th edition of textbook
Replies: 2
Views: 568

5th edition of textbook

I have the fifth edition of the textbook instead of the sixth edition. Is there a big difference, as far as the text and homework problems go? I know that the order of chapters are different. (I.e. Thermodynamics is covered in Ch. 7 of the 5th edition.)

Go to advanced search