Search found 31 matches
- Sun Mar 19, 2017 11:45 am
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Newman Projection
- Replies: 2
- Views: 1545
Newman Projection
How do you number the carbons in a newman projection? I know that the big circle in the back is the second carbon and the point in the middle of the Y is the first carbon? Where is the third and fourth carbon located?
- Fri Mar 17, 2017 10:28 pm
- Forum: *Ethers
- Topic: Priority of Ethers
- Replies: 4
- Views: 4308
Re: Priority of Ethers
Are the highest priority groups in Professor Lavelle's example the chlorine and ether?
- Fri Mar 17, 2017 10:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Details and Review Sessions Winter 2017
- Replies: 114
- Views: 27147
Re: Final Exam Details and Review Sessions Winter 2017
yoonjong_han_3F wrote:do we need to know how to draw ether, carboboxylic acid, or amines and cyclic amines??
it is so hard!!!!
We will have to know how to identify them in a structure. I'm not sure if we will have to draw them, but it would be safe to know how to.
2.21
So for this problem in the organic textbook on pg. 97, it asks to name the compound of a structure including alcohol. I understand why the carbon with the functional group,alcohol, was numbered first, but why did the numbering continue towards methyl? I thought that when there is a double bond, we a...
- Mon Mar 06, 2017 9:33 pm
- Forum: *Cycloalkanes
- Topic: Cyclo-
- Replies: 7
- Views: 2302
Re: Cyclo-
Kaitlin_Ryan_ 3K wrote:When numbering carbons on a Cyclo- molecule, which carbon is numbered first?
Chem_Mod said in another post that "In the case of cycloalkanes, the substituent with the highest priority will have the first number, and then work to find the lowest constituent numbering".
- Sat Mar 04, 2017 12:56 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
If a queen farts, is it considered a noble gas?
- Wed Feb 22, 2017 8:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 24899
Re: Quiz 2 Winter 2017
For #8, how do you get your units to become 6.06 minutes?
I know you have to use the first-order integrated rate law to find the time.
I did ln(0.35 M/1.50 M)/-4.00*10^-3 s^-1
Is this correct?
I know you have to use the first-order integrated rate law to find the time.
I did ln(0.35 M/1.50 M)/-4.00*10^-3 s^-1
Is this correct?
- Wed Feb 22, 2017 7:52 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
Are you a catalyst?
Cause you increase the rate of my heart.
Cause you increase the rate of my heart.
- Wed Feb 15, 2017 3:00 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing (Acidic vs. Basic Balancing)
- Replies: 3
- Views: 759
Re: Balancing (Acidic vs. Basic Balancing)
Yes, I think that the question will specify whether the reaction is in a basic or acidic solution since the homework problems do.
- Wed Feb 15, 2017 2:39 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.85
- Replies: 2
- Views: 650
14.85
How can you tell which metal is more strongly reducing than the others from the list: Fe, Ag, Au, Zn, Cu, Ni, Co, Al?
- Mon Feb 13, 2017 10:04 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Textbook Problem #14.27
- Replies: 2
- Views: 585
Textbook Problem #14.27
Using data from Appendix 2B, calculate the standard potential for the half-reaction U4^+(aq) + 4e- -> U(s)
Can someone explain how to do this problem?
Can someone explain how to do this problem?
- Sun Feb 12, 2017 11:36 am
- Forum: Balancing Redox Reactions
- Topic: Midterm 2016 #6C
- Replies: 1
- Views: 1311
Midterm 2016 #6C
The following redox reaction is used in acidic solution in the Breathalyzer test to determine the level of alcohol in the blood: H+(aq) + Cr2O7^2-(aq) + C2H5OH(aq) -> Cr^3+(aq) + C2H4O(aq) + H2O(l) Write and balance the reduction half-reaction. The answer is Cr2O7^2-(aq) + 14H^+(aq) + 6e- -> 2Cr^3+(...
- Sat Feb 11, 2017 6:31 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
What's a cation afraid of?
A dogion.
A dogion.
- Mon Jan 30, 2017 3:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25699
Re: Quiz 1 Preparation Answers
For #12, what do I plug in for deltaS?
Is deltaH 2*(-824.2)?
Is deltaH 2*(-824.2)?
- Thu Jan 26, 2017 10:10 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Difference between bond enthalpies and standard enthalpies of formation
- Replies: 1
- Views: 634
Re: Difference between bond enthalpies and standard enthalpies of formation
Hi, Bond enthalpy(aka bond energy) is the amount of energy required to break one mole of the stated bond. For example, the bond energy of a O-H single bond is 463 kJ/mol. This means that it requires 463 kJ of energy to break one mole of O-H bonds. When all reactants and products are in their standar...
- Thu Jan 26, 2017 9:40 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal?
- Replies: 2
- Views: 761
Re: Isothermal?
Hi, In this link, https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=128&t=9661 Dr. Lavelle stated that an isothermal process is a change in a system where the temperature stays constant: ΔT = 0. He also defines other words such as isobaric or adiabatic. As for R, there are multiple values that...
- Sun Jan 22, 2017 1:14 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
Q: Why did Carbon marry Hydrogen?
A: They bonded well from the minute they met
A: They bonded well from the minute they met
- Sat Jan 14, 2017 4:03 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
What kind of dogs do chemists have?
Laboratory Retrievers.
Laboratory Retrievers.
- Thu Dec 01, 2016 11:13 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration
- Replies: 1
- Views: 530
Electron Configuration
For Pb, where do you start counting to get n=4 for the f-block?
- Thu Nov 24, 2016 9:49 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
Where does one put the dirty dishes after thanksgiving dinner?
In the zinc.
In the zinc.
- Tue Nov 15, 2016 9:10 pm
- Forum: Naming
- Topic: How to find the roman numeral when naming compounds [ENDORSED]
- Replies: 4
- Views: 10855
- Tue Nov 15, 2016 8:56 pm
- Forum: Naming
- Topic: How to find the roman numeral when naming compounds [ENDORSED]
- Replies: 4
- Views: 10855
How to find the roman numeral when naming compounds [ENDORSED]
Hi, so I'm a bit rusty on naming compounds.
So for [FeCl3(H2O)3]-, the roman numeral would be (II).
I was wondering how to get that number?
So for [FeCl3(H2O)3]-, the roman numeral would be (II).
I was wondering how to get that number?
- Sat Nov 12, 2016 5:14 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
During christmas, I always put up my chemistree.
- Tue Nov 01, 2016 8:37 pm
- Forum: Hybridization
- Topic: Fall 2014 Quiz 2 Prep #4
- Replies: 2
- Views: 652
Re: Fall 2014 Quiz 2 Prep #4
Thanks!
- Tue Nov 01, 2016 8:12 pm
- Forum: Hybridization
- Topic: Fall 2014 Quiz 2 Prep #4
- Replies: 2
- Views: 652
Fall 2014 Quiz 2 Prep #4
Hello all,
For #4, the two possible chain structures for C3H4 was provided in the answers. However, the hybridization for each carbon atom was not. Can someone please tell me what the hybridization is so I can check my answers?
For #4, the two possible chain structures for C3H4 was provided in the answers. However, the hybridization for each carbon atom was not. Can someone please tell me what the hybridization is so I can check my answers?
- Mon Oct 24, 2016 10:43 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
A chemistry teacher was berating her students for not learning the Periodic Table of Elements.
She said, "Why when I was your age, I knew both their names and weights."
One kid popped up, "Yeah, but teacher, there were so few of them back then."
She said, "Why when I was your age, I knew both their names and weights."
One kid popped up, "Yeah, but teacher, there were so few of them back then."
- Tue Oct 18, 2016 2:08 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
Why did the white bear dissolve in water?
Because it was polar.
Because it was polar.
- Wed Oct 12, 2016 3:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642823
Re: Post All Chemistry Jokes Here
How does copper say goodbye?
CU later!
CU later!
- Sun Oct 09, 2016 5:16 pm
- Forum: Empirical & Molecular Formulas
- Topic: Question on #9 from Quiz 1 Preparation Fall 2015 [ENDORSED]
- Replies: 1
- Views: 646
Question on #9 from Quiz 1 Preparation Fall 2015 [ENDORSED]
"Xylitol, a sugar substitute, has a mass composition of C 39.43%, O 52.58% H 7.88% and a molar mass of 152.15 g/mol. What is its molecular formula?" So I tried solving this problem and I got C5H10O5. The answer in the back, however, was C5H12O5. How do I go about to get the right answer? I...
- Tue Oct 04, 2016 5:48 pm
- Forum: DeBroglie Equation
- Topic: Question on #9 from Quiz 1 Preparation in Workbook
- Replies: 1
- Views: 402
Question on #9 from Quiz 1 Preparation in Workbook
"Calculate the de Broglie wavelength of a 0.155 kg ball traveling at 85.0 m.s^-1" I tried to solve this problem using the wavelength=h/p equation. I did 6.626*10^-34 J.s / (.155 kg)(85.0 m.s^-1)= 3.63*10^-31 m The answer in the back was actually 5*10^-35 m. Can someone tell me what I did w...
- Mon Sep 26, 2016 10:38 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Jokes
- Replies: 31
- Views: 8978
Re: Chemistry Jokes
Q: Why are chemists great for solving problems?
A: They have all the solutions!
A: They have all the solutions!