Search found 26 matches

by 604746385
Sat Mar 18, 2017 11:55 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Practice Problems
Replies: 23
Views: 2330

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?
by 604746385
Sat Mar 18, 2017 11:53 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Practice Problems
Replies: 23
Views: 2330

Re: Practice Problems

Thank you!
by 604746385
Sat Mar 18, 2017 9:11 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Practice Problems
Replies: 23
Views: 2330

Re: Practice Problems

Better question when would you use E and Z notation for cyclo-molecules?
by 604746385
Sat Mar 18, 2017 9:08 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Practice Problems
Replies: 23
Views: 2330

Re: Practice Problems

On problem set 2 number 5, why wouldn't you use E and Z notation?
by 604746385
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: 313

Re: Final 2013 Q4C

the amount of oxygen is decreasing so it gets a negative sign as it is a reactant
by 604746385
Sat Mar 11, 2017 7:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011507

Re: Post All Chemistry Jokes Here

what is the chemical equation for a banana?

BaNa2
by 604746385
Tue Mar 07, 2017 9:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15853

Re: Quiz 3 Winter 2017

Tert refers to tertiary carbon meaning it is connected to 3 other carbons
by 604746385
Sun Feb 26, 2017 2:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011507

Re: Post All Chemistry Jokes Here

I would tell a chemistry joke but all the good ones argon.
by 604746385
Mon Feb 20, 2017 2:09 pm
Forum: First Order Reactions
Topic: homework 15.23 C
Replies: 1
Views: 286

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,...
by 604746385
Mon Feb 20, 2017 1:53 pm
Forum: General Rate Laws
Topic: pseudo rate law vs non-pseudo rate law
Replies: 1
Views: 234

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...
by 604746385
Sat Feb 18, 2017 6:23 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams [ENDORSED]
Replies: 3
Views: 358

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.
by 604746385
Sat Feb 11, 2017 9:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011507

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"
by 604746385
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: 250

Re: Homework Help 14.9

Cool I had the same question thanks!
by 604746385
Sat Jan 28, 2017 8:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free and Standard Gibbs free
Replies: 1
Views: 254

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.
by 604746385
Sat Jan 21, 2017 9:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Homework Problem 8.41
Replies: 2
Views: 331

Re: Homework Problem 8.41

It takes energy to melt the ice
by 604746385
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: 257

Re: Fall 2012 Final # 5C

I2 is a solid so it doesn't affect equilibrium
by 604746385
Fri Dec 02, 2016 7:24 pm
Forum: Lewis Acids & Bases
Topic: examples
Replies: 1
Views: 325

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.
by 604746385
Sun Nov 27, 2016 6:38 pm
Forum: Lewis Acids & Bases
Topic: Strong/Weak Acid/Base
Replies: 3
Views: 795

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.
by 604746385
Sun Nov 20, 2016 3:30 pm
Forum: Bronsted Acids & Bases
Topic: Proton donors
Replies: 2
Views: 375

Re: Proton donors

So helpful thanks!
by 604746385
Sun Nov 13, 2016 11:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 3 #7
Replies: 1
Views: 229

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.
by 604746385
Sat Nov 05, 2016 11:06 pm
Forum: Hybridization
Topic: Which Hybrid Orbital
Replies: 6
Views: 604

Re: Which Hybrid Orbital

Helpful thanks!
by 604746385
Sat Oct 29, 2016 10:18 pm
Forum: Hybridization
Topic: s character
Replies: 3
Views: 43452

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 ...
by 604746385
Sun Oct 16, 2016 9:28 pm
Forum: Photoelectric Effect
Topic: Manipulating the Photoelectric Effect Equation
Replies: 1
Views: 243

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)
by 604746385
Sun Oct 09, 2016 6:52 pm
Forum: SI Units, Unit Conversions
Topic: SI Units/conversions memorization [ENDORSED]
Replies: 4
Views: 1004

Re: SI Units/conversions memorization [ENDORSED]

Helpful stuff thanks!
by 604746385
Mon Sep 26, 2016 2:24 pm
Forum: Significant Figures
Topic: Easy Way to Calculate Sigfigs
Replies: 6
Views: 836

Re: Easy Way to Calculate Sigfigs

Helpful thanks!

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