Search found 21 matches

by Yamilex Velgara 2I
Fri Mar 17, 2017 10:48 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 2013 Final Exam #2
Replies: 3
Views: 476

Re: 2013 Final Exam #2

Why did you switch the signs for hydrolysis of ATP form positive to negative and the formation of acetyl phosphate from negative to positive? In part 2B, the question states that the phosphorylation of acetic acid is the REVERSE of the hydrolysis of acetyl phosphate (this info is in parentheses). S...
by Yamilex Velgara 2I
Sat Mar 11, 2017 11:30 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Torsional Strain [ENDORSED]
Replies: 5
Views: 621

Re: Torsional Strain [ENDORSED]

In lecture, Professor Lavelle mentioned that the most stable conformations have the least energy, and the least stable conformations have the most energy. Can somebody explain why there is this inverse relationship between energy and stability in conformations?
by Yamilex Velgara 2I
Sat Mar 04, 2017 7:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018521

Re: Post All Chemistry Jokes Here

104733309 wrote:How do you post a picture to the joke page?


You can attach it if you scroll down below the box that says "I agree." Click on "Attachments" >> "Add files."
by Yamilex Velgara 2I
Sat Mar 04, 2017 7:16 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018521

Re: Post All Chemistry Jokes Here

When Dr. Lavelle talked about vinyl this week, I thought about vinyl car seats.
by Yamilex Velgara 2I
Sat Feb 25, 2017 8:15 pm
Forum: Administrative Questions and Class Announcements
Topic: O-Chem Black and white textbook
Replies: 3
Views: 347

Re: O-Chem Black and white textbook

regina_ho_3A wrote:Should we bring the OChem textbook with us to class?


I think this is unnecessary, because we only need the book to read and do homework/practice problems. Think of it as a second textbook. The turquoise course reader has all the notes we need for lectures,
by Yamilex Velgara 2I
Sat Feb 18, 2017 10:46 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018521

Re: Post All Chemistry Jokes Here

Since Valentine's Day just passed
by Yamilex Velgara 2I
Sat Feb 11, 2017 9:09 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018521

Re: Post All Chemistry Jokes Here

How I feel about midterms and finals
by Yamilex Velgara 2I
Sat Feb 04, 2017 8:45 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Example on page 50 in course reader (Gold)
Replies: 1
Views: 270

Example on page 50 in course reader (Gold)

In the example about gold on page 50 of the course reader, delta Goredox was +1.56 x 105 J. This told us that gold will not dissolve in 1M nitric acid. What about this answer led us to this conclusion? How would we know if the gold DID dissolve?
by Yamilex Velgara 2I
Sun Jan 29, 2017 1:40 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Degeneracy vs Entropy trends
Replies: 1
Views: 199

Degeneracy vs Entropy trends

On page 29 of the course reader, it says "Molecules in gaseous phase occupy many more states than liquid phase & solid phase" and the following is given: W G > W L > W S since S = kB ln W then S G >> S L > S S Is there a reason that in the second part about entropy, there is a ">>...
by Yamilex Velgara 2I
Sat Jan 21, 2017 11:34 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question about the ideal gas law [ENDORSED]
Replies: 1
Views: 290

Re: Question about the ideal gas law [ENDORSED]

When answering any science question involving math, it's important to consider what information was given to you. For example, if you are to find the change in energy of a system, but are not given work, you can find work by using the ideal gas law (PV=nRT). However, if you ARE given work, then you ...
by Yamilex Velgara 2I
Sat Jan 14, 2017 11:50 pm
Forum: Student Social/Study Group
Topic: Chemistry Joke
Replies: 28
Views: 2903

Re: Chemistry Joke

lol
by Yamilex Velgara 2I
Sat Dec 03, 2016 2:54 pm
Forum: Naming
Topic: Prefixes in Naming (mono)
Replies: 1
Views: 289

Prefixes in Naming (mono)

When using prefixes for ligands, are we supposed to disregard "mono"? Question 17.29c has one aqua ligand, and I thought it was monoaqua but the answer has it as only aqua.
by Yamilex Velgara 2I
Sat Nov 26, 2016 6:41 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Can you classify acids as strong or weak from their formulas alone? [ENDORSED]
Replies: 7
Views: 891

Re: Can you classify acids as strong or weak from their formulas alone? [ENDORSED]

I'm not entirely sure, but for the purpose of this class, memorize the list of strong acids. All other acids will most likely be weak acids, according to my PLF.
by Yamilex Velgara 2I
Sat Nov 19, 2016 12:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Discussion next week? [ENDORSED]
Replies: 5
Views: 3038

Re: Discussion next week? [ENDORSED]

There should be, unless you were told otherwise by your TA. Also, quizzes will be handed back during week 9 discussion.
by Yamilex Velgara 2I
Sat Nov 12, 2016 6:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018521

Re: Post All Chemistry Jokes Here

After scrolling through 11 pages of jokes, this is how I feel.
by Yamilex Velgara 2I
Sat Nov 05, 2016 8:09 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018521

Re: Post All Chemistry Jokes Here

kitty joke.jpg
if anyone is into Rihanna
by Yamilex Velgara 2I
Tue Oct 25, 2016 1:17 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Formal Charge Formula Clarification
Replies: 2
Views: 466

Re: Formal Charge Formula Clarification

When solving for formal charge, your compound will only be stable if the formal charge is 0. To determine which of two resonance structures is the most likely, choose the one with the most formal charges of 0 for each atom. Two resonance structures may have an overall formal charge of 0, but the one...
by Yamilex Velgara 2I
Sat Oct 22, 2016 10:56 pm
Forum: Sigma & Pi Bonds
Topic: Quiz 2 Preparation (Question 1)
Replies: 2
Views: 379

Re: Quiz 2 Preparation (Question 1)

This will not be on the quiz because we did not cover it in lecture. Many of the questions on the quiz preparation are from Chapter 4, and we are to skip them.
by Yamilex Velgara 2I
Fri Oct 14, 2016 8:52 pm
Forum: Molarity, Solutions, Dilutions
Topic: Help needed for molarity problem [ENDORSED]
Replies: 1
Views: 584

Re: Help needed for molarity problem [ENDORSED]

In order to solve this problem, you will be using MV=MV. You are given the initial mass of the solute, the initial volume, the final volume, and you are asked to find the final molarity. The molar mass of KCl is 74.551 g/mol (found using the molar masses of K and Cl). First, find the initial molarit...
by Yamilex Velgara 2I
Sat Oct 08, 2016 9:54 pm
Forum: SI Units, Unit Conversions
Topic: When do we know whether to use gram vs. kilogram, etc.? [ENDORSED]
Replies: 4
Views: 800

Re: When do we know whether to use gram vs. kilogram, etc.? [ENDORSED]

The question will usually tell you what units to express your answer in, but if it doesn't, I would say stick to the standard (grams or meters). Also, you should be able to receive credit as long as your answer and units match up. For example, if your answer is 1500 grams, it's ok to write down 1.5 ...
by Yamilex Velgara 2I
Fri Sep 30, 2016 8:45 pm
Forum: Empirical & Molecular Formulas
Topic: Mole Ratio: Whole Number Ratios vs. Decimal Ratios
Replies: 3
Views: 6556

Re: Mole Ratio: Whole Number Ratios vs. Decimal Ratios

I had a similar question, but mine was for F21. When calculating the molar ratios for the empirical formula, my numbers were slightly different than the ones in the solutions manual, but I kept them that way until the end of the problem. I had 8.07 mol C (8.18 in solutions), 12.94 mol H (13.0 in sol...

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