Search found 31 matches
- Mon Mar 13, 2017 5:23 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Axial Bonds and Equatorial Bonds
- Replies: 2
- Views: 928
Re: Axial Bonds and Equatorial Bonds
There aren't any physical differences except for the fact that axial bonds are drawn with a 90 degree angle to the parent chain while equatorials have a smaller slight angle. The main purpose on differentiating between the two is two be able to predict how the axial and equatorial hydrogens on the a...
- Mon Mar 06, 2017 4:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Winter 2017
- Replies: 183
- Views: 29001
Re: Quiz 3 Winter 2017
danny_nguyen_3C wrote:Are we required to know reaction mechanisms for the quiz?
If by section mechanisms you mean where we split up for example an electrophilic addition reaction into two steps and draw arrows representing where the electrons are going, then yes you must know them.
- Sat Mar 04, 2017 2:52 pm
- Forum: *Cycloalkanes
- Topic: Numbering of Substituents [ENDORSED]
- Replies: 8
- Views: 2847
Re: Numbering of Substituents [ENDORSED]
If numbering order doesn't matter, then how is 1-ETHYL-3-Methyl-4-PROPYLCYCLOHEXANE wrong as opposed to 4-ETHYL-2-METHYL-1-PROPYLCYCLOHEXANE? Do you have to add all the numbers up and see which one gives the lowest?
- Sat Mar 04, 2017 1:51 pm
- Forum: *Cycloalkanes
- Topic: Numbering of Substituents [ENDORSED]
- Replies: 8
- Views: 2847
Numbering of Substituents [ENDORSED]
I just wanted to clarify something from class on Friday. When you have two substituents with the same numbering, you always have to give the first named group the lower number. But if they are not the same, do you give the lower number to the last group? I just got confused because of the example on...
- Tue Feb 28, 2017 11:10 am
- Forum: *Nucleophiles
- Topic: Term to know?
- Replies: 1
- Views: 427
Term to know?
There are certain terms like ambient nucleophiles and the nucleophile strength present in the green into to organic chem book that are not in the course reader. Are we responsible for knowing all of them, even if they weren't mentioned in lecture?
- Sat Feb 25, 2017 3:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2989896
- Tue Feb 14, 2017 6:24 pm
- Forum: Student Social/Study Group
- Topic: 14C discussion Switch
- Replies: 1
- Views: 523
Re: 14C discussion Switch
Sure if I ever get the class smh....
- Tue Feb 14, 2017 10:49 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Stable molecules
- Replies: 2
- Views: 426
Re: Stable molecules
So then in the formula deltaG= deltaH-T*deltaS, how can G and H be zero but entropy is still positive?
- Mon Feb 13, 2017 9:57 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Stable molecules
- Replies: 2
- Views: 426
Stable molecules
Is the standard entropy of formation just like enthalpy and Gibb's free energy where the value is zero when the molecule is in it's most stable form?
- Tue Feb 07, 2017 9:33 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Potential Difference
- Replies: 1
- Views: 278
Potential Difference
What is potential difference in the conceptual sense? Is it the same as voltage?
- Mon Jan 30, 2017 1:44 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Calculating Degeneracy
- Replies: 2
- Views: 676
Re: Calculating Degeneracy
I believe you only use the degeneracy equation when calculating the positional or residual entropy. So basically when you are dealing with calculating entropy in the molecular form, not with thermal entropy.
- Mon Jan 30, 2017 1:32 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 9.7
- Replies: 1
- Views: 378
Re: 9.7
All ideal gases are monoatomic gases
- Tue Jan 24, 2017 10:45 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Residual Entropy
- Replies: 1
- Views: 396
Residual Entropy
I understand that entropy can be positional, but can someone explain what residual entropy is?
- Wed Jan 18, 2017 3:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Practice Quizzes in the Course Reader
- Replies: 1
- Views: 368
Practice Quizzes in the Course Reader
I know that there are preparation for the three quizzes along with the midterms and finals in the back of the course reader. In Chem 14 A these quizzes had the solutions in the back, but now there are not any solutions so none of us can check our answers . Are there solutions to these practice quizz...
- Wed Jan 11, 2017 9:01 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Stable forms for Standard Enthalpies of Formation
- Replies: 2
- Views: 469
Stable forms for Standard Enthalpies of Formation
Must we memorize the stable form of every element in order to conclude that their Standard Enthalpies of Formation is zero?
- Sun Dec 04, 2016 10:52 am
- Forum: Resonance Structures
- Topic: delocalization
- Replies: 1
- Views: 524
Re: delocalization
Delocalization implies that the electron in an anion is pulled away by a more electronegative element as to minimize an electronegative charge.
- Tue Nov 29, 2016 11:03 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2013 Final Question 2C
- Replies: 2
- Views: 605
Re: 2013 Final Question 2C
The question says that all of these have the [Kr]4d^10 configuration EXCEPT one of the following, which by what you discovered, would be Pd. So, Pd is the answer because it is the only one that does NOT have that configuration. Actually the only one that did not have a configuration of [Kr]4d^10 wa...
- Mon Nov 28, 2016 1:10 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2013 Final Question 2C
- Replies: 2
- Views: 605
2013 Final Question 2C
this question asks what elements can have the electron configuration [Kr]4d^10. One of the answers was Pd which when I did the configuration, I got [Kr]4d^8 5s^2. Does this mean that the exception that occurs with chromium and copper also applies to elements in that need two more electrons to fill u...
- Mon Nov 21, 2016 2:44 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: When to use the approximation [ENDORSED]
- Replies: 2
- Views: 576
When to use the approximation [ENDORSED]
When using the ICE box to calculate the concentrations of a weak acid or base, I know that we can use an approximation in the calculation of the acidity or basicity constant if the constant is small. But what is the exact of when to to use this approximation?
- Tue Nov 15, 2016 8:14 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Chlorophyll conceptual basis [ENDORSED]
- Replies: 1
- Views: 622
Chlorophyll conceptual basis [ENDORSED]
I remember it being mentioned in class, but how exactly does the MO diagram demonstrate how the chlorophyll absorbs certain lights and reflects green light?
- Tue Nov 15, 2016 7:58 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number for (en) [ENDORSED]
- Replies: 6
- Views: 2850
Re: Coordination Number for (en) [ENDORSED]
Caitlin Dillon 4G wrote:So since en is bidentate? Is dien tridentate because it has 3 nitrogens?
dien is a tridente because when you draw the lewis structure, the nitrogens have a lone pair and can therefore donate both of those electrons to from a coordinating bond.
- Fri Nov 11, 2016 1:42 pm
- Forum: Naming
- Topic: Order of ligands in the reverse naming
- Replies: 1
- Views: 394
Order of ligands in the reverse naming
When given the name and then asked to write the formula, I know the transition metal within the brackets go first, but what is the order if you have multiple ligands? Is that alphabetical too?
- Wed Nov 09, 2016 2:41 pm
- Forum: Properties of Light
- Topic: Question 3B on the Fall 2016 Midterm [ENDORSED]
- Replies: 3
- Views: 811
Question 3B on the Fall 2016 Midterm [ENDORSED]
I know a lot of my peers have been marked down on this question as well, which asks "What was the major conceptual change of the photoelectric experiment?". I have already checked the answer solution which said "Light described as packets or photons/quanta of energy." I woke that...
- Mon Nov 07, 2016 1:20 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation State
- Replies: 3
- Views: 626
Re: Oxidation State
The oxidation state is basically the charge on the entire ion. So if the charge is a positive two, put "(II) right after the element name.
- Mon Oct 31, 2016 1:50 pm
- Forum: Hybridization
- Topic: Hybridization for the midterm
- Replies: 2
- Views: 658
Hybridization for the midterm
At this point in the quarter are we expected to only know which hybridization to use based off knowing the corresponding number of electron regions or are there other ways to determine the hybridization of an atom?
- Mon Oct 24, 2016 11:37 pm
- Forum: Lewis Structures
- Topic: workbook Quiz 2 preparation #7
- Replies: 2
- Views: 588
Re: workbook Quiz 2 preparation #7
That extra pair of electrons on Xenon is there because when you count the electrons you end up with only 32, but you need 34 total. So since Xenon is an exception to the octet rule, it can hold more electrons and that one lone pair is added to it.
- Mon Oct 17, 2016 11:31 pm
- Forum: Lewis Structures
- Topic: Lewis Structures #3.33 (c)
- Replies: 1
- Views: 391
Re: Lewis Structures #3.33 (c)
You have the correct Lewis Dot Structure for ONF, the solution manual must either have a different shape showing a resonance, or it is the editor's version of writing it.
- Mon Oct 10, 2016 2:40 pm
- Forum: DeBroglie Equation
- Topic: Conceptual Wavelength measurement
- Replies: 3
- Views: 459
Conceptual Wavelength measurement
What is the smallest detectable wavelength? I know for an electron the wavelength is 10^-12, are there any other wavelengths like 10^-15 that can be detected?
- Tue Oct 04, 2016 9:22 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Joke
- Replies: 18
- Views: 3256
Re: Chemistry Joke
What is the name of Agent 007's Eskimo cousin?
The name is Bond...Polar Bond
The name is Bond...Polar Bond
- Wed Sep 28, 2016 7:34 pm
- Forum: Properties of Light
- Topic: Nature of light [ENDORSED]
- Replies: 3
- Views: 718
Re: Nature of light [ENDORSED]
Are there any other objects or substances that have the same dual property of wave and particle qualities the same way light does?
- Mon Sep 26, 2016 3:04 pm
- Forum: Student Social/Study Group
- Topic: Dykstra Hall Study Group (Fall 2016)
- Replies: 25
- Views: 3485
Re: Dykstra Hall Study Group (Fall 2016)
Hey, I'm on Dykstra floor 9 and I would love to meet up to study as well. Let's just set up a time and place!