Search found 26 matches
- Sat Mar 18, 2017 11:55 am
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Practice Problems
- Replies: 23
- Views: 4235
Re: Practice Problems
Is there a similar rule for using E and Z describing 8 membered ring structures but in branched and non-ring structures?
- Sat Mar 18, 2017 11:53 am
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Practice Problems
- Replies: 23
- Views: 4235
Re: Practice Problems
Thank you!
- Sat Mar 18, 2017 9:11 am
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Practice Problems
- Replies: 23
- Views: 4235
Re: Practice Problems
Better question when would you use E and Z notation for cyclo-molecules?
- Sat Mar 18, 2017 9:08 am
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Practice Problems
- Replies: 23
- Views: 4235
Re: Practice Problems
On problem set 2 number 5, why wouldn't you use E and Z notation?
- Sat Mar 18, 2017 12:19 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Final 2013 Q4C
- Replies: 2
- Views: 586
Re: Final 2013 Q4C
the amount of oxygen is decreasing so it gets a negative sign as it is a reactant
- Sat Mar 11, 2017 7:14 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3648367
Re: Post All Chemistry Jokes Here
what is the chemical equation for a banana?
BaNa2
BaNa2
- Tue Mar 07, 2017 9:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Winter 2017
- Replies: 183
- Views: 29793
Re: Quiz 3 Winter 2017
Tert refers to tertiary carbon meaning it is connected to 3 other carbons
- Sun Feb 26, 2017 2:57 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3648367
Re: Post All Chemistry Jokes Here
I would tell a chemistry joke but all the good ones argon.
- Mon Feb 20, 2017 2:09 pm
- Forum: First Order Reactions
- Topic: homework 15.23 C
- Replies: 1
- Views: 527
Re: homework 15.23 C
Find the concentration of A after the concentration of .034 M of B is created. This should be .153 (A initial) minus 2(2molA/1molB) times .034 which is .085 mol/L of A. From this, k=ln(Ain./Afin.)/time; k=ln(.153/.085)/115 sec = 0.00511. Got that equation from ln[A]=-kt+ln[Ain.], ln[A]-ln[Ain.]=-kt,...
- Mon Feb 20, 2017 1:53 pm
- Forum: General Rate Laws
- Topic: pseudo rate law vs non-pseudo rate law
- Replies: 1
- Views: 426
Re: pseudo rate law vs non-pseudo rate law
The pseudo rate law is for reactions with more than one reactant, so k' is found by making one reactant concentration small and the others large, making the large concentrations essentially constant. This allows you to ignore the reactants with large concentrations, so k' would only depend on the re...
- Sat Feb 18, 2017 6:23 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams [ENDORSED]
- Replies: 3
- Views: 707
Re: Cell Diagrams [ENDORSED]
It's when there is no metal in one of the half reactions, so the platinum or other metal supplies or removes electrons.
- Sat Feb 11, 2017 9:13 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3648367
Re: Post All Chemistry Jokes Here
A neutron walks into a bar and asks how much for a beer?
The bartender says "For you, no charge"
The bartender says "For you, no charge"
- Sat Feb 04, 2017 8:18 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Homework Help 14.9
- Replies: 3
- Views: 562
Re: Homework Help 14.9
Cool I had the same question thanks!
- Sat Jan 28, 2017 8:25 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs free and Standard Gibbs free
- Replies: 1
- Views: 496
Re: Gibbs free and Standard Gibbs free
standard gibbs free energy is fixed for a reaction and temperature, while gibbs free energy varies. The gibbs free energy will change throughout a reaction as the molar amounts of the products and reactants will change.
- Sat Jan 21, 2017 9:56 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Homework Problem 8.41
- Replies: 2
- Views: 587
Re: Homework Problem 8.41
It takes energy to melt the ice
- Sat Jan 14, 2017 8:46 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Don't understand bond enthalpy
- Replies: 4
- Views: 913
Re: Don't understand bond enthalpy
So helpful thanks!
- Fri Dec 02, 2016 7:29 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Fall 2012 Final # 5C
- Replies: 1
- Views: 463
Re: Fall 2012 Final # 5C
I2 is a solid so it doesn't affect equilibrium
- Fri Dec 02, 2016 7:24 pm
- Forum: Lewis Acids & Bases
- Topic: examples
- Replies: 1
- Views: 516
Re: examples
If there's a Kb or Ka then it's a weak acid or base. I don't think we need to memorize the k values, so if one is given, then it's weak.
- Sun Nov 27, 2016 6:38 pm
- Forum: Lewis Acids & Bases
- Topic: Strong/Weak Acid/Base
- Replies: 3
- Views: 2629
Re: Strong/Weak Acid/Base
For acids the halogens except fluorine form strong acids. Then that just leaves perchloric, nitric, and sulfuric acid, and arguably chloric acid. The alkali metal hydroxides and oxides are considered strong bases. If you think of it that way then you only have to memorize some of the strong compounds.
- Sun Nov 20, 2016 3:30 pm
- Forum: Bronsted Acids & Bases
- Topic: Proton donors
- Replies: 2
- Views: 807
Re: Proton donors
So helpful thanks!
- Sun Nov 13, 2016 11:21 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quiz 3 #7
- Replies: 1
- Views: 424
Re: Quiz 3 #7
I think you need to find the concentrations of the 2 gases because the problem gives you Kc, and from that find the Qc value, which is what the first part is asking. The second part is then asking whether or not the forward or reverse reaction is favorable based on the Qc value.
- Sat Nov 05, 2016 11:06 pm
- Forum: Hybridization
- Topic: Which Hybrid Orbital
- Replies: 6
- Views: 1138
Re: Which Hybrid Orbital
Helpful thanks!
- Sat Oct 29, 2016 10:18 pm
- Forum: Hybridization
- Topic: s character
- Replies: 3
- Views: 87474
Re: s character
The number of hybrid orbitals depends on how many regions of electron density there are, which is the sum of the number of bonded atoms and lone pair electrons. If there are 4 regions of electron density for say carbon, then you will need 4 hybrid orbitals made up of 3 p and 1 s, giving you 4 equal ...
- Sun Oct 16, 2016 9:28 pm
- Forum: Photoelectric Effect
- Topic: Manipulating the Photoelectric Effect Equation
- Replies: 1
- Views: 563
Re: Manipulating the Photoelectric Effect Equation
You can solve for the velocity of an electron:
E(electron)=E(photon)-work
E(e)=1/2(mvsquared)=kinetic energy of an electron
1/2(mvsquared)=E(p)-work
mvsquared=2(E(p)-work)
vsquared=2/m(E(p)-work)
v=squareroot(2/m(E(p)-work)
E(electron)=E(photon)-work
E(e)=1/2(mvsquared)=kinetic energy of an electron
1/2(mvsquared)=E(p)-work
mvsquared=2(E(p)-work)
vsquared=2/m(E(p)-work)
v=squareroot(2/m(E(p)-work)
- Sun Oct 09, 2016 6:52 pm
- Forum: SI Units, Unit Conversions
- Topic: SI Units/conversions memorization [ENDORSED]
- Replies: 4
- Views: 2342
Re: SI Units/conversions memorization [ENDORSED]
Helpful stuff thanks!
- Mon Sep 26, 2016 2:24 pm
- Forum: Significant Figures
- Topic: Easy Way to Calculate Sigfigs
- Replies: 6
- Views: 1554
Re: Easy Way to Calculate Sigfigs
Helpful thanks!