Search found 23 matches
- Sat Mar 05, 2016 8:22 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Anti Conformation
- Replies: 2
- Views: 650
Anti Conformation
For this molecule, I know it is staggered but would it also be considered in its anti-conformation since the two largest atoms are opposite of each other?
- Thu Mar 03, 2016 6:01 pm
- Forum: *Alcohols
- Topic: Naming priority between double bond and functional group
- Replies: 4
- Views: 15920
Re: Naming priority between double bond and functional group
I am not sure if that is true because in this example from Kahn Academy the double bond got the priority for the lower number.
- Sun Feb 28, 2016 1:32 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Question 4.37 in O-Chem Book
- Replies: 1
- Views: 434
Question 4.37 in O-Chem Book
When commenting on the possible values for standard enthalpies of activation (delta H) and standard entropies of activation (delta S) why are delta H values always unfavorable positive and why are delta S values often unfavorable negative? The book answer key gives a little explanation but I don't r...
- Sat Feb 27, 2016 4:02 pm
- Forum: *Alkenes
- Topic: Differences in Naming Compounds
- Replies: 1
- Views: 577
Differences in Naming Compounds
Is (3Z, 5E)-3-bromoocta-3,5-diene the same as:
(3Z, 5E)-3-bromo-3,5-octadiene?
In other words, is it ok to say 3,5-octadiene instead of putting the 3,5 between octa and diene?
(3Z, 5E)-3-bromo-3,5-octadiene?
In other words, is it ok to say 3,5-octadiene instead of putting the 3,5 between octa and diene?
- Fri Feb 26, 2016 2:51 pm
- Forum: *Alkanes
- Topic: Cis- versus Trans-
- Replies: 1
- Views: 480
Cis- versus Trans-
When do we indicate when an organic compound is Cis or Trans? In all of the solutions for chapter one it is never really indicated.
- Fri Feb 26, 2016 2:04 pm
- Forum: *Alkanes
- Topic: Cis- versus Trans-
- Replies: 2
- Views: 637
Cis- versus Trans-
When do we indicate when an organic compound is Cis or Trans? In all of the solutions for chapter one it is never really indicated.
- Tue Feb 16, 2016 2:40 pm
- Forum: Second Order Reactions
- Topic: 2016 Winter Workbook pg. 36 #10
- Replies: 1
- Views: 517
2016 Winter Workbook pg. 36 #10
For the problem:
Consider the reaction A+B-->C+D rate=k[A]squared
The time it takes for [A] to decrease from 1.0 to 0.50M is the same as the time it takes [A] to decrease from 0.50 to 0.25M. True or false?
Why is this false?
Consider the reaction A+B-->C+D rate=k[A]squared
The time it takes for [A] to decrease from 1.0 to 0.50M is the same as the time it takes [A] to decrease from 0.50 to 0.25M. True or false?
Why is this false?
- Tue Feb 02, 2016 5:40 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Adding an Electrode to a Cell Diagram?
- Replies: 1
- Views: 559
Adding an Electrode to a Cell Diagram?
For the Cell Diagram in the attached photo, why is Platinum only added to the Cathode and not the Anode? The original reaction was 2NO3- (aq) + 8H+ (aq) +6Hg(l) > 3Hg2 2+ (aq) + 2NO (g) + 4H2O (l)
Also when do we add an electrode like platinum to a cell diagram?
Also when do we add an electrode like platinum to a cell diagram?
- Sun Jan 31, 2016 8:00 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Moles for Free Energy
- Replies: 1
- Views: 448
Moles for Free Energy
For the questions that have us find the standard reaction Gibbs free energy and give us a reaction, how do we know how many moles to use? Basically, where do we find the amount of moles to use?
- Sun Jan 24, 2016 1:02 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Homework 9.13
- Replies: 1
- Views: 598
Homework 9.13
When we are calculating change in entropy with a change in volume and temperature of a gas, why do we assume that there is just 1 mole of gas? In the problem we are give the two different volumes and the two different temperatures. We also assume ideal behavior of the gas.
- Mon Jan 18, 2016 1:07 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Transfer Equations
- Replies: 2
- Views: 686
Heat Transfer Equations
When do we use Q=C x Delta T versus Q=n x C x Delta T? For example in question 8.53 we needed to find the heat released from burning 1.40 grams of CO in a bomb calorimeter and the equation q=C x Delta T was used. Why was this equation used and why do we sometimes include the moles/grams (n) in the e...
- Mon Jan 18, 2016 12:06 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H and what it represents
- Replies: 1
- Views: 790
Delta H and what it represents
When do we know Delta H is pr mole. I though that Delta H was just the energy in Joules, however in homework problem 8.45 the Delta H is per mole according to the solutions manual. Also, how do we know what Delta H is representing in different problems?
- Sun Jan 10, 2016 9:31 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Order
- Replies: 1
- Views: 354
Homework Order
For chapter 8, I know we are going somewhat backwards as compared to the book, but what is the order of homework we should do in accordance to the lectures?
- Fri Dec 04, 2015 12:38 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3643604
Re: Chemistry Jokes
My TA threw some Sodium Chloride at me in discussion today...
That's a-salt!
That's a-salt!
- Tue Dec 01, 2015 6:45 pm
- Forum: Lewis Structures
- Topic: N2O4 Lewis Structure
- Replies: 1
- Views: 2656
N2O4 Lewis Structure
In the attached photo, why is the boxed Lewis Structure incorrect and the one below it correct for the best structure. All of the formal charges are zero in the boxed one. This came from the first final exam in the course reader.
- Tue Nov 24, 2015 3:38 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 12.67 Calculating pH from Molarity and Formula
- Replies: 1
- Views: 788
12.67 Calculating pH from Molarity and Formula
For question 12.67 in the homework, when you are given the molarity and molecular formula, how are we supposed to go about ranking the pH. I was thinking the ice box however the solutions manual does not do this. It seems like it does it a much easier way. Can you rank the pH's just by looking at th...
- Mon Nov 16, 2015 10:45 am
- Forum: Naming
- Topic: Simply way of how to name complex coordination compounds
- Replies: 1
- Views: 501
Re: Simply way of how to name complex coordination compounds
For the rules on naming, the book has a chart on page 741. However, when I first looked at it it was a little confusing. I found this video and it helped a lot after reading the book chart. It is a bunch of examples and doing them as the video did them helped. https://www.youtube.com/watch?v=RKXYxTO...
- Thu Nov 05, 2015 5:47 pm
- Forum: Naming
- Topic: Aqua versus Hydro in Coordination Compounds
- Replies: 1
- Views: 624
Aqua versus Hydro in Coordination Compounds
In the course reader, it says that H2O's name is aqua, however it also is hydro sometimes. What is the difference between the two and when do I use each?
- Sat Oct 31, 2015 12:04 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order and # of Electrons for stability
- Replies: 3
- Views: 1036
Bond Order and # of Electrons for stability
I know that the higher the bond order the more stable the molecule, but how does number of electrons (perhaps bonded or unbounded) play into how stable a molecule is? The question I am referring to gives both the bond order and number of electrons for a compound and asks for increasing stability, bu...
- Sun Oct 25, 2015 1:22 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Determining Resonance
- Replies: 3
- Views: 841
Re: Determining Resonance
I think that you usually need to calculate the formal charges. It is a good way to check your work too, especially if the compound has a negative or positive charge, because it must have that charge. Also, a little shortcut is (I'm not sure how helpful this is) that whenever you have an Oxygen with ...
- Thu Oct 15, 2015 10:13 pm
- Forum: Resonance Structures
- Topic: What is or isn't a Resonance Structure?
- Replies: 2
- Views: 947
What is or isn't a Resonance Structure?
According to the solutions manual chapter three question 45, the boxed lewis structure in the attached image is not a resonance structure. Why not? it has 24 electrons and octets for all the atoms involved.
- Sat Oct 10, 2015 2:34 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Beginning the F orbital for electron configurations
- Replies: 2
- Views: 601
Beginning the F orbital for electron configurations
The course reader does not seem to go into detail for the F-orbital so do we need to know the configurations of atoms lower in the D block with F-orbitals? There seems to be more exceptions (similar to Chromium and Copper maybe) as you move further down in the periodic table. If so, when does the f-...
- Sat Oct 10, 2015 2:17 pm
- Forum: Trends in The Periodic Table
- Topic: Electron affinity trends
- Replies: 2
- Views: 834
Re: Electron affinity trends
It is not as periodic as atomic radius or ionization energy, but generally electron affinity is higher for the elements in the top right of the periodic table. However there are a few exceptions like how Carbon's electron affinity is higher than nitrogen's.