Search found 21 matches
- Tue Mar 08, 2016 9:08 pm
- Forum: *Cyclopentanes
- Topic: final 2007 6b
- Replies: 6
- Views: 2418
Re: final 2007 6b
thanks!
- Fri Mar 04, 2016 10:00 am
- Forum: *Alkanes
- Topic: Quiz 3 Preparation
- Replies: 34
- Views: 11648
Re: Quiz 3 Preparation
thanks!
- Thu Feb 25, 2016 12:25 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: half lives
- Replies: 4
- Views: 11321
Re: half lives
thanks!
- Tue Feb 16, 2016 5:29 pm
- Forum: General Rate Laws
- Topic: Quiz 2 Prep Winter 2014 Activation Energy
- Replies: 1
- Views: 330
Quiz 2 Prep Winter 2014 Activation Energy
Quiz 2 Prep Winter 2014 #10 asks for the activation energy for the reaction.
I am confused as to which formula to use and what values to put in it. I thought we need to use ln (k'/k)= (Ea/R)(T'-T/T'T); however, I am not sure of what values to plug in for T and T'.
Thanks
I am confused as to which formula to use and what values to put in it. I thought we need to use ln (k'/k)= (Ea/R)(T'-T/T'T); however, I am not sure of what values to plug in for T and T'.
Thanks
- Tue Feb 16, 2016 3:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Up to what problem should we work in the textbook?
- Replies: 4
- Views: 561
Re: Up to what problem should we work in the textbook?
I stopped at question 15.65 because the questions started to talk about catalysis which we haven't covered yet.
- Thu Feb 11, 2016 12:32 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics
- Replies: 2
- Views: 610
Re: Kinetics
Thank you!
- Tue Feb 02, 2016 9:15 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Simplifying Ecell
- Replies: 1
- Views: 334
Simplifying Ecell
If T is a different value does (2.303RT)/(F) still equal to .059 V? Thanks!
- Mon Jan 25, 2016 3:14 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Work Done on System or By System
- Replies: 2
- Views: 12648
Work Done on System or By System
Hello, I was wondering how you know if work is being done by the system or on the system and how to determine it. Thank you!
- Wed Jan 20, 2016 4:38 pm
- Forum: Phase Changes & Related Calculations
- Topic: Ch 8.10 Topics
- Replies: 2
- Views: 398
Ch 8.10 Topics
Chapter 8.10 talks about the equipartition theorem and rotational energy. Do we need to know these terms for this course? Thanks!
- Fri Jan 15, 2016 12:55 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy as a property
- Replies: 1
- Views: 383
Re: Entropy as a property
Entropy is an extensive property labeled with S; however, specific entropy is an intensive property labeled with s. Entropy is extensive because its amount changes based on the quantity of matter in the system. An example would be that it takes more heat to melt a bucket of ice than it does to melt ...
- Wed Jan 06, 2016 9:16 pm
- Forum: Phase Changes & Related Calculations
- Topic: Hess's Law
- Replies: 8
- Views: 1059
Re: Hess's Law
I believe today in lecture Dr. Lavelle said that you could use any of the methods and get the same result, but we have only gone through two of the three ways.
- Mon Nov 30, 2015 8:56 pm
- Forum: Conjugate Acids & Bases
- Topic: Weak Acid and Weak Base
- Replies: 1
- Views: 373
Weak Acid and Weak Base
What would happen if you had a weak acid and weak base reacting? Is this even plausible? Thanks!
- Mon Nov 23, 2015 1:32 pm
- Forum: Naming
- Topic: Using the word ion
- Replies: 2
- Views: 553
Using the word ion
I was wondering how you know whether or not to use the word "ion" when naming a chemical compound. Does saying "ion" at the end of the name mean that it has a negative charge? Or does it not affect the name in any way? Thanks!
- Mon Nov 16, 2015 9:54 pm
- Forum: Naming
- Topic: complex has positive charge
- Replies: 1
- Views: 399
Re: complex has positive charge
For complexes with a positive charge, you usually add a Roman numeral in parenthesis after the element. An example would be (Co(en)2(CN)Cl)Cl. The name of this compound would be chlorocyanobisethylenediaminecobalt(II) chloride.
Hope this helped!
Hope this helped!
- Wed Nov 11, 2015 5:24 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Compression and photosynthesis. 11.115 hmwk
- Replies: 4
- Views: 635
Re: Compression and photosynthesis. 11.115 hmwk
Change in pressure does not change K. In this case, even though more pressure may be on the reactants, the reaction will eventually reach equilibrium again and balance out. Refer to page 129 in the course reader.
- Mon Nov 02, 2015 12:12 pm
- Forum: Einstein Equation
- Topic: 2010 Midterm Review Q4 Mass of Chromium
- Replies: 1
- Views: 616
2010 Midterm Review Q4 Mass of Chromium
Q4. The work function for chromium metal is 4.37eV. What wavelength of radiation must be used to eject electrons with a velocity of 1.5x10^3 kms-1? In the answer provided to this question, they use the formula Ek=(1/2)mv^2 which makes sense. The next step is Ek=(1/2) (9.10939x10^-31 kg)(1.5x10^6ms-1...
- Tue Oct 27, 2015 6:42 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge and resonance structures
- Replies: 2
- Views: 593
Re: Formal charge and resonance structures
Calculating a formal charge is not necessarily mandatory in order to determine if there is resonance or a better Lewis structure for a compound; however, it is an extremely accurate and efficient way to determine what the best Lewis structure is. The formal charge of a compound must be equal to the ...
- Fri Oct 23, 2015 3:59 pm
- Forum: Hybridization
- Topic: Unhybridized p orbitals
- Replies: 2
- Views: 1354
Re: Unhybridized p orbitals
The hybridization of a molecule is not dependent upon the number of valence electrons carbon has. The valence electrons are necessary in order to form the Lewis structure of ethene; however, when determining hybridization, valence electrons do not influence the electron density because you have alre...
- Fri Oct 23, 2015 3:46 pm
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 2
- Views: 583
Re: Resonance
Resonance structures are used when one Lewis structure for a single molecule cannot fully describe the bonding that takes place between neighboring atoms relative to the empirical data for the actual bond lengths between those atoms. More info on this: http://chemwiki.ucdavis.edu/Theoretical_Chemist...
- Thu Oct 08, 2015 10:01 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Sequence
- Replies: 1
- Views: 405
Electron Configuration Sequence
When writing an electron configuration for Vanadium (or any other element in the d-block), why does the 3d come before the 4s? For Vanadium, why is it (Ne)3s^2 3p^6 3d^3 4s^2 and not (Ne)3s^2 3p^6 4s^2 4d^3? I just don't understand why the number associated with the d series is always one less than ...
- Fri Oct 02, 2015 3:05 pm
- Forum: Significant Figures
- Topic: Use of Significant Figures with Constants
- Replies: 3
- Views: 10415
Re: Use of Significant Figures with Constants
When determining the amount of significant figures to use in a problem, be sure to always use the amount of significant figures in the variable given to you in the question. For example, if the equation tells you that the velocity is 2.4 x 10^5 and the constant is the speed of light at 2.999999 x 10...