Search found 21 matches

by Diana Catapusan 1N
Tue Mar 14, 2017 5:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Bimolecular Nucleophile Substitution
Replies: 2
Views: 305

Re: Bimolecular Nucleophile Substitution

I don't think it would matter that much, but I would write out the entire name just in case and put SN2 in parentheses.
by Diana Catapusan 1N
Mon Mar 06, 2017 1:49 pm
Forum: *Cycloalkanes
Topic: Example on p. 96
Replies: 1
Views: 225

Example on p. 96

Can someone clarify what it means in the course reader when it says, "More than 2 substituents on ring: compare each number and select name with lowest number"? For the example, the correct answer is 4-ethyl-2-methyl-1-propylcyclohexane, but why would 1-ethyl-3-methyl-4-propylcyclohexane b...
by Diana Catapusan 1N
Thu Mar 02, 2017 12:51 pm
Forum: *Alkanes
Topic: Drawing Structures
Replies: 1
Views: 190

Drawing Structures

Is it mandatory to always draw the transition state in a reaction diagram? Or would we only draw it if the question specifically asks for it?
by Diana Catapusan 1N
Tue Feb 21, 2017 1:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15737

Re: Quiz 2 Winter 2017

Hi, can someone show me how they did #7, I know you use the first order integrated rate law, but when I work it out I am not getting the answer that is posted. First, you need to rearrange the first order integrated rate law and isolate k. (k=ln(A/A 0 )/t) After, plug in each value. k=ln(0.622M/0.7...
by Diana Catapusan 1N
Mon Feb 13, 2017 4:19 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversibility
Replies: 2
Views: 336

Re: Reversibility

Usually, problems will state if they are reversible or irreversible. Some hints to know if they are reversible are when delta Stotal is equal to zero, making delta Ssystem=-delta Ssurroundings, and when temperature is constant, while volume increases and pressure decreases. Hope this helps!
by Diana Catapusan 1N
Wed Feb 08, 2017 5:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 3
Views: 343

Re: Cell Diagrams

When drawing cell diagrams, I think the difference between using a line and comma is due to phase changes. If the element remains in the same phase (ex: aqueous to aqueous), you would use and comma. If the element undergoes a phase change (ex: aqueous to solid), you would use a line. Hope this helps!
by Diana Catapusan 1N
Tue Jan 31, 2017 12:52 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Quiz 1 Preparation #5
Replies: 1
Views: 314

Quiz 1 Preparation #5

I understand that we have to add all the enthalpy values at the end of the problem, but why do we have to reverse one of the reactions? How do you know which one to flip?
by Diana Catapusan 1N
Mon Jan 23, 2017 8:04 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Quiz 1 Prep, #8
Replies: 4
Views: 487

Re: Quiz 1 Prep, #8

This is actually kind of a trick question! It is actually NOT spontaneous at any temperature. When ∆H is positive and ∆S is negative, ∆G is never spontaneous. Hope this helps!
by Diana Catapusan 1N
Wed Jan 18, 2017 5:31 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Memorizing Enthalpies???
Replies: 2
Views: 349

Re: Memorizing Enthalpies???

I asked a UA this, and they said we don't have to memorize any bond enthalpies because they should be provided. I would double check this to make sure though!
by Diana Catapusan 1N
Wed Jan 11, 2017 9:07 pm
Forum: Administrative Questions and Class Announcements
Topic: UA Office Hours
Replies: 1
Views: 264

UA Office Hours

Are the UA office hours in Hedrick Hall already taking place? If not, when will they begin? Thanks!
by Diana Catapusan 1N
Thu Dec 01, 2016 3:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Final 2012: Q4
Replies: 1
Views: 378

Final 2012: Q4

At the end of this question, it asks if any of the molecules are "radicals." What exactly are radicals?
by Diana Catapusan 1N
Sat Nov 26, 2016 9:42 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 5
Views: 669

Re: Naming Coordination Compounds

I think you would use ferrate instead of iron when the iron atom has an overall negative charge. For example, when the overall compound that includes an iron atom is negative, you wouldn't change it to "ironate," you would change it to ferrate. There are a few other metals, like copper, th...
by Diana Catapusan 1N
Mon Nov 14, 2016 3:32 pm
Forum: Student Social/Study Group
Topic: Naming Complexes
Replies: 6
Views: 1020

Re: Naming Complexes

You would use prefixes bis-, tris-, tetrakis-, etc. when the compound already has another prefix such as di- or tri-. For exmaple, the ligand ethylene di amine has the prefix di-. If there were two of these ligands (en) 2 , then you would use the prefix bis- and name it bisethylenediamine. If there ...
by Diana Catapusan 1N
Wed Nov 09, 2016 7:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Class on Wednesday November 23
Replies: 2
Views: 552

Re: Class on Wednesday November 23

Someone had asked this in lecture and Dr. Lavelle said he will keep us posted if there will be class on that Wednesday. He said it will depend on how far we are on the material, so I'm thinking he will decide closer to Thanksgiving break.
by Diana Catapusan 1N
Fri Nov 04, 2016 5:50 pm
Forum: General Science Questions
Topic: * and Antibonding
Replies: 1
Views: 951

Re: * and Antibonding

Yes, the * signifies anti-bonding. When calculating bond order, the sigma* or pi* orbitals allow you to recognize the number of electrons in that orbital.
by Diana Catapusan 1N
Wed Oct 26, 2016 7:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 3
Views: 352

Re: Midterm

In lecture today, someone asked the same question and Dr. Lavelle did not give a direct answer. He said he will keep us posted next week.
by Diana Catapusan 1N
Thu Oct 20, 2016 4:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7750
Views: 1070231

Re: Post All Chemistry Jokes Here

Do you have 11 protons?

Because you're SO-DIUM fine!
by Diana Catapusan 1N
Wed Oct 12, 2016 5:41 pm
Forum: SI Units, Unit Conversions
Topic: Conversions
Replies: 2
Views: 312

Re: Conversions

Thank you so much, this really helped! :)
by Diana Catapusan 1N
Wed Oct 12, 2016 5:12 pm
Forum: SI Units, Unit Conversions
Topic: Conversions
Replies: 2
Views: 312

Conversions

A problem I keep having is that I forget when to convert kilograms into grams or milliliters into liters and vice versa. When is it necessary to work in kg or grams? mL or liters? Do you all have any tips on how to remember when to convert units? Thank you!
by Diana Catapusan 1N
Wed Oct 05, 2016 11:15 pm
Forum: *Black Body Radiation
Topic: Quiz one topics
Replies: 7
Views: 855

Re: Quiz one topics

I think Chapter 1 will also be included on the quiz (as far as we have gone through in Chapter 1 at least). But I have another question, will the quiz be more conceptual or more mathematical? I don't really know how to best prepare myself for the quiz..
by Diana Catapusan 1N
Wed Sep 28, 2016 9:32 pm
Forum: Student Social/Study Group
Topic: Hedrick Summit Study Group Chem 14A
Replies: 29
Views: 2666

Re: Hedrick Summit Study Group Chem 14A

I'd like to join the Summit study group! Just let me know when and where. I also think it'd be a good idea to plan the study sessions around the review sessions in Hedrick Hall.

Go to advanced search