Search found 29 matches

by Vivian Wang 3J
Tue Mar 14, 2017 1:57 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Equatorial and axial bonds
Replies: 4
Views: 766

Re: Equatorial and axial bonds

Axial bonds point up/down and are referred to accordingly. Equatorial bonds only point slightly up/down and are referred to accordingly. Start with the carbon to carbon bonds. Think of how those are arranged according to the conformations. For chair conformation of cyclohexane, "each carbon ato...
by Vivian Wang 3J
Tue Mar 14, 2017 1:42 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Final 2014 - Q2B,a
Replies: 1
Views: 232

Re: Final 2014 - Q2B,a

The answer shows \Delta S to not equal 0. There is also change in volume. The changes in volume occurs for each gas. For Argon, from 7.60L to 12.90L, and for Neon, from 5.30L to 12.90L. Though the final volumes are the same, the initial volume of each gas is not, which must be considered when calcul...
by Vivian Wang 3J
Mon Mar 06, 2017 12:02 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 917185

Re: Post All Chemistry Jokes Here

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by Vivian Wang 3J
Sun Feb 26, 2017 10:54 pm
Forum: *Electrophiles
Topic: Acids and Bases
Replies: 1
Views: 297

Re: Acids and Bases

A nucleophile (electron rich) is Lewis base, which means it is a reactant that provides a pair of electrons to form a new covalent bond. When the nucleophile donates a pair of electrons to a proton, it’s called a Brønsted base, or simply, “base”. An electrophile, or a Lewis acid, is a species that a...
by Vivian Wang 3J
Sun Feb 19, 2017 11:54 pm
Forum: Second Order Reactions
Topic: Homework Problem 15.19
Replies: 3
Views: 308

Re: Homework Problem 15.19

Increasing the concentration of B by the ratio (from experiments 2 and 3) increases the rate by .

Therefore, the reaction is second order in B.
by Vivian Wang 3J
Sun Feb 12, 2017 4:47 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 917185

Re: Post All Chemistry Jokes Here

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by Vivian Wang 3J
Sat Feb 04, 2017 1:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 917185

Re: Post All Chemistry Jokes Here

Periodic Table of Candy Elements
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by Vivian Wang 3J
Sun Jan 29, 2017 3:54 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: When does DeltaG=0
Replies: 1
Views: 228

Re: When does DeltaG=0

\Delta G = 0 only when the system is at equilibrium. For a phase change, that means that the reaction is taking place under conditions at which the two phases are at equilibrium. For example, when liquid water freezes, the ice must be formed at 0 C\degree and 1 bar pressure, where the reactants and...
by Vivian Wang 3J
Sat Jan 21, 2017 11:03 am
Forum: Phase Changes & Related Calculations
Topic: irreversible vs reversible expansions
Replies: 2
Views: 274

Re: irreversible vs reversible expansions

A reversible process can be reversed because the conditions under which it is carried out are very controlled. For the piston example in the textbook (page 265), the pressure of the confined gas and the external pressure are matched to keep the system in thermodynamic equilibrium. At equilibrium, th...
by Vivian Wang 3J
Tue Jan 17, 2017 10:41 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Given q and w, will a gas's pressure increase or decrease? [ENDORSED]
Replies: 4
Views: 410

Re: Given q and w, will a gas's pressure increase or decrease? [ENDORSED]

It is reasonable to say that the pressure is decreasing because the gas is expanding.
by Vivian Wang 3J
Sat Dec 03, 2016 6:39 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pHun zone!
Replies: 1
Views: 433

pHun zone!

This may or may not be helpful. It is already Saturday.

Good luck.

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by Vivian Wang 3J
Sat Nov 26, 2016 10:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework Help 11.39
Replies: 1
Views: 328

Re: Homework Help 11.39

Table 11.2 contains the K values for the following equations at 300 K: H 2 (g) + Cl 2 (g) <==> 2HCl (g) , K 1 = 4.0 x 10 31 = \frac{(P_{H_{2}})(P_{Cl_{2}})}{(P_{HCl})^{2}} 2BCl (g) <==> Br 2 (g) + Cl 2 (g) , K 2 = 377 = \frac{&#...
by Vivian Wang 3J
Thu Nov 17, 2016 9:03 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: 2007 Final Question 3B
Replies: 2
Views: 372

Re: 2007 Final Question 3B

Higher electronegativity means lower energy level. Removing an electron from oxygen would require less energy than removing an electron from nitrogen.
by Vivian Wang 3J
Thu Nov 17, 2016 8:34 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: NO +2 Orbital
Replies: 1
Views: 253

Re: NO +2 Orbital

I would make the molecular orbital for NO first, then just take away two from the orbitals. That is, make this first (NO): http://2012books.lardbucket.org/books/principles-of-general-chemistry-v1.0/section_13/79fe2d438dfbad163cc8119628add7e9.jpg And then just take away two electrons (one from π* 2px...
by Vivian Wang 3J
Thu Nov 17, 2016 8:30 pm
Forum: Naming
Topic: Difference between H2O and OH2
Replies: 1
Views: 3536

Re: Difference between H2O and OH2

The atoms will bond where there are unshared electron pairs. OH 2 is written that way because it is just more convenient to show that the H 2 O is oriented that direction in order to bond to the central atom. The central atom always attaches to the oxygen atom in H 2 O because that is where the unsh...
by Vivian Wang 3J
Wed Nov 09, 2016 4:19 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Quiz 3 prep [ENDORSED]
Replies: 6
Views: 748

Re: Quiz 3 prep [ENDORSED]

No, at office hours, he said you do not need to draw the ethylenes. Just draw a line connecting the nitrogens to represent the spacers.
by Vivian Wang 3J
Mon Oct 31, 2016 1:39 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Adding electrons for exceptions
Replies: 3
Views: 444

Re: Adding electrons for exceptions

Hello! Here is the electron configuration of Cu: [Ar] 3d10 4s1. Then, the ion has a 2+ charge so two electrons are removed. One is taken from the 4s sub-shell, the other from the 3d sub-shell. So the electron configuration of Cu2+ is: 1s2 2s2 2p6 3s2 3p6 3d9. The noble gas electron configuration is...
by Vivian Wang 3J
Fri Oct 28, 2016 11:21 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Adding electrons for exceptions
Replies: 3
Views: 444

Adding electrons for exceptions

What would Cu2- look like?

Electron configuration of Cu: [Ar]3d104s1
by Vivian Wang 3J
Fri Oct 28, 2016 11:16 am
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Character
Replies: 5
Views: 8348

Re: Ionic and Covalent Character

"Ionic and covalent character represent points along a continuum."

Based on this statement, we can assume that as ionic character of a bond increases, covalent character of the same bond decreases.
And, as covalent character of a bond increases, ionic character of that bond decreases.
by Vivian Wang 3J
Thu Oct 27, 2016 2:34 am
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Character
Replies: 5
Views: 8348

Re: Ionic and Covalent Character

Ionic and covalent character describe the nature of the bond between atoms. For example, a molecule with a higher ionic character than covalent character means that the atoms have more of a give-and-take relationship for the electrons that bond them. If the bond were described to have higher covalen...
by Vivian Wang 3J
Thu Oct 20, 2016 9:37 am
Forum: Administrative Questions and Class Announcements
Topic: Workbook prep for Quiz #2
Replies: 1
Views: 216

Re: Workbook prep for Quiz #2

Only the material on the quiz to be handed in will be more reflective of the actual quiz. Previous years' has stuff we haven't covered yet and will not be on the upcoming quiz.
by Vivian Wang 3J
Thu Oct 20, 2016 9:35 am
Forum: Trends in The Periodic Table
Topic: Chapter 2 HW #93
Replies: 2
Views: 515

Re: Chapter 2 HW #93

http://bio1151.nicerweb.com/Locked/media/ch02/02_13IonicBonding.jpg Since Na wants to lose that electron to make an octet, it will, becoming Na+. Cl gains an electron with the bond, becoming Cl-. It is the ionic bonding that causes them to change in atomic radius. If we were considering Na and Cl s...
by Vivian Wang 3J
Fri Oct 14, 2016 2:38 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration of electrons
Replies: 2
Views: 339

Electron configuration of electrons

Chromium, Cr
[Ar] 3d5 4s1

Copper, Cu
[Ar] 3d10 4s1

When these two lose electrons, would they be removed from the 3d subshell or 4s subshell?

For example: Cr2+
Would become: [Ar] 3d3 4s1 ?
OR [Ar] 3d4 ?
by Vivian Wang 3J
Fri Oct 07, 2016 12:47 pm
Forum: Properties of Electrons
Topic: Q. 1.11 Lower energy levels for spectral each spectral series? [ENDORSED]
Replies: 1
Views: 269

Re: Q. 1.11 Lower energy levels for spectral each spectral series? [ENDORSED]

Each series has a specific energy level because those are the energy levels at either end of the jump producing a particular line in the spectrum. "For example, in the Lyman series, n is always 1. Electrons are falling to the 1-level to produce lines in the Lyman series. For the Balmer series, ...
by Vivian Wang 3J
Thu Sep 29, 2016 3:37 pm
Forum: Molarity, Solutions, Dilutions
Topic: Question on G25
Replies: 5
Views: 663

Re: Question on G25

Moles of solute stays the same for diluting and molarity changes.
However, when you take a smaller volume of a solution, molarity stays the same, but moles of solute will decrease.
by Vivian Wang 3J
Thu Sep 29, 2016 7:07 am
Forum: Photoelectric Effect
Topic: Photons and Electrons question [ENDORSED]
Replies: 1
Views: 286

Re: Photons and Electrons question [ENDORSED]

It is the amount of energy. One photon removes one electron, provided that the photon has reached the threshold energy.
by Vivian Wang 3J
Wed Sep 28, 2016 5:51 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals G13
Replies: 2
Views: 885

Re: Fundamentals G13

In this problem, you are given initial volume (1.0 L) and initial molarity (0.20 M NH4NO3). When the florist adds 3.0 L of water, the solution is diluted, and therefore will have a new volume and new molarity. The new, or final, volume of this solution will be initial + addition water, which is: 1.0...
by Vivian Wang 3J
Wed Sep 28, 2016 1:02 pm
Forum: Student Social/Study Group
Topic: Sproul Hall Chem14A Study Group
Replies: 30
Views: 2277

Re: Sproul Hall Chem14A Study Group

Yes please.
by Vivian Wang 3J
Mon Sep 26, 2016 3:37 pm
Forum: Student Social/Study Group
Topic: Chemistry Jokes
Replies: 31
Views: 4274

Re: Chemistry Jokes

Most people find chemistry jokes funny; I find them prephosphorous.

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