Search found 11 matches

Sat Mar 11, 2017 6:52 pm
Forum: *Alkanes
Topic: 1.16 Ch.1 Organic Textbook Question
Replies: 2
Views: 373

1.16 Ch.1 Organic Textbook Question

Hello, I was wondering for 1.16 in the textbook solutions the answer is written as
2-Isopropyl-1,1-dimethylcyclopentane

I got 1,1-dimethyl-2-Isopropylcyclopentane

I thought that we ignore prefixes when it comes to naming things in order, is there an exception for iso-/neo-?

Thanks
Sun Feb 19, 2017 5:30 pm
Forum: First Order Reactions
Topic: Calculating concentration #23c
Replies: 4
Views: 889

Re: Calculating concentration #23c

Hi, This is because when we find the concentration of A by multiplying [B] by 2, we are actually finding how much [A] is used up in the reaction. So because we found how much A is used up to produce .034M of B, we subtract that amount from the initial concentration of [Ao] that we have final concent...
Tue Feb 14, 2017 4:53 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm 2016 Q5 Part C Quick Question
Replies: 1
Views: 261

Midterm 2016 Q5 Part C Quick Question

If the concentration of ATP is adjusted to four times its equilibrium concentration, what is the value of delta G? Hint: Use expression for Q. The manual states that Q = 1/4K but if the concentration of ATP is 4 times the equilibrium concentration K, why wouldn't Q be 4K? (Then we plug in 4K for Q a...
Wed Feb 08, 2017 7:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.11d Set Up Question
Replies: 1
Views: 177

14.11d Set Up Question

I already looked through the other threads about this question, but I'm still unsure how people found the right way to set up the half-reactions through the cell diagram. Pt(s)| O2(g)| H+(aq) || OH-(aq)|O2(g)|Pt(s) I understand that: the left is the anode and oxidation half reaction the right is the...
Fri Jan 27, 2017 4:46 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: HW 9.13
Replies: 1
Views: 298

HW 9.13

Hello, how do you know how to set this problem up
and in the solution manual, it sues
delta S = nRln(T2/T1) , using nR instead of C, why doesn't it use C and are they interchangable?
Thank you!
Thu Jan 26, 2017 10:06 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Quiz 1 Preparation: Question 6
Replies: 4
Views: 614

Re: Quiz 1 Preparation: Question 6

Hi, I'm not sure if I got the right answer but what I did was: First, looking at the problem, we know that we are have an exothermic reaction, because the propane is burned to release 2580kJ (which means delta H of this will be negative) of energy in the form of heat(q). Then, we can see that there ...
Sun Jan 22, 2017 2:10 pm
Forum: Phase Changes & Related Calculations
Topic: Expected Conversions [ENDORSED]
Replies: 2
Views: 411

Re: Expected Conversions[ENDORSED]

I think we'll get a sheet with the conversions we need to know!
Sun Jan 15, 2017 1:17 pm
Forum: Phase Changes & Related Calculations
Topic: Exothermic vs Endothermic
Replies: 3
Views: 432

Re: Exothermic vs Endothermic

I think a good way to look at is by thinking about the surroundings vs system. Looking at how they interact, energy is usually transferred from one place to another, in this case either the system --> surrounding, or surrounding --> system. In an endothermic reaction, the system heats up, and the su...
Mon Jul 18, 2016 7:00 pm
Forum: Hybridization
Topic: Relative Orientations of Hybrid Orbitals
Replies: 1
Views: 357

Relative Orientations of Hybrid Orbitals

Hello,
How do we determine the orientations of hybrid orbitals? Would they be the same as VSEPR orientations?
Thanks!
Sun Jul 03, 2016 6:59 pm
Forum: Ionic & Covalent Bonds
Topic: Electron Affinity Energy
Replies: 2
Views: 367

Re: Electron Affinity Energy

Hi Ayane,

I think its because the added electron is going from a state of high --> low orbital, so energy would end up being released!
Sun Jun 26, 2016 9:02 pm
Forum: Empirical & Molecular Formulas
Topic: Question from online forum: The Molecular Formula of Xylitol
Replies: 2
Views: 1316

Re: Question from online forum: The Molecular Formula of Xyl

Hi, So first we must find the empirical formula in order to get the molecular formula (to find the specific number of atoms in the molar mass given) Given the mass percentage composition, we convert the percentages into grams, giving us C = 39.43g O =52.58g H = 7.88g Now, we can convert these into m...