Search found 13 matches
- Sat Mar 18, 2017 3:49 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: HW 8.73 (Bond Enthalpies
- Replies: 5
- Views: 1324
Re: HW 8.73 (Bond Enthalpies
I'm not getting the correct answer for part A. I get a -369kJ/mol but the answer is -597kJ/mol? Can anyone help me with this please? Never mind, I figured it out. C6H6 is benzene, and all of benzene's carbon bonds are resonance bonds, which have a different bond enthalpy than a single carbon bond o...
- Sat Mar 18, 2017 3:37 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: HW 8.73 (Bond Enthalpies
- Replies: 5
- Views: 1324
Re: HW 8.73 (Bond Enthalpies
I'm not getting the correct answer for part A. I get a -369kJ/mol but the answer is -597kJ/mol? Can anyone help me with this please?
- Fri Mar 17, 2017 11:27 pm
- Forum: *Cycloalkanes
- Topic: Final 2013 Q6 - Numbering
- Replies: 3
- Views: 1570
Final 2013 Q6 - Numbering
Hi everyone!
Can anyone explain why the methyls of the cyclohexane in Question 6A of the 2013 Final are numbered 1,5,5,6 and not 1,2,3,3?
Can anyone explain why the methyls of the cyclohexane in Question 6A of the 2013 Final are numbered 1,5,5,6 and not 1,2,3,3?
- Fri Mar 17, 2017 11:14 pm
- Forum: *Alkanes
- Topic: Final 2013 Q5 - Transition States
- Replies: 1
- Views: 1222
Final 2013 Q5 - Transition States
Can anyone please explain to me how one would come up with the transition state as shown in Q5 Part C of the 2013 Final? Which bonds are being formed/broken, and what are the two H's?
- Fri Mar 17, 2017 10:24 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 2013 Final Practice Exam, Question 4a; n=?
- Replies: 6
- Views: 1914
Re: 2013 Final Practice Exam, Question 4a; n=?
I have one more question! Can anyone go through the math portion with me? I don't really understand what goes on from 0.044V=0.0257/4lnQ. How do we get that Q=942.23? I get a much smaller answer doing this math.
- Fri Mar 17, 2017 9:14 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 2013 Final Practice Exam, Question 4a; n=?
- Replies: 6
- Views: 1914
Re: 2013 Final Practice Exam, Question 4a; n=?
Why does 2Fe(s) in the reactants have an oxidation number of zero again? Is it because it is in it's most stable form or something like that?
- Sun Mar 05, 2017 10:21 pm
- Forum: *Alkanes
- Topic: Naming [ENDORSED]
- Replies: 93
- Views: 16706
Re: Naming [ENDORSED]
On page 93 of the course reader, we choose 4-ethyl-2,2-dimethyl-hexane as the correct name of the molecule instead of 3-ethyl-5,5-dimethyl-hexane. We are always supposed to choose the name with the lowest number, so why do we choose 4-ethyl instead of the 3-ethyl? Is it dependent on the dimethyl only?
- Sun Feb 26, 2017 8:52 pm
- Forum: *Electrophiles
- Topic: Nucleophile and Electrophile
- Replies: 3
- Views: 1208
Re: Nucleophile and Electrophile
In the course reader, we can also determine electrophiles and nucleophiles based on delta positive or negative, right? Can anybody explain that to me more clearly please? Thanks!
- Sun Feb 19, 2017 11:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 24849
Re: Quiz 2 Winter 2017
Hi everyone and sorry, this might be a dumb question, but will we need to know page 65 in the course reader? I don't want to be surprised if radioactivity shows up. Thank you so much!
- Sat Feb 11, 2017 4:22 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Quiz One - #5 Calculating Heat
- Replies: 2
- Views: 585
Quiz One - #5 Calculating Heat
Hello! Can anybody explain how to do #5 on our first quiz? I knew the equations to use, I think I just didn't use the right heat capacities. How do I know which ones to use?
- Sun Feb 05, 2017 4:29 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Inert Conductors
- Replies: 1
- Views: 370
Inert Conductors
Hello, could anyone give me a brief explanation of inert conductors again? When are the instances when we need to use them and when we don't, and what effect do they have on the reactions taking place?
Thanks!
Thanks!
- Sat Jan 28, 2017 9:38 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: HW Problem 8.37 Need Help
- Replies: 4
- Views: 2220
HW Problem 8.37 Need Help
Hello everyone, could someone please help me with problem 8.37? I'm not sure what step to take first. a) At its boiling point, the vaporization of 0.597 mol CH4(l) requires 4.76kJ of heat. What is the enthalpy of vaporization of methane? b) An electric heater was immersed in a flask of boiling ethan...
- Sat Jan 21, 2017 5:19 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Relationship Between Volume and # of States
- Replies: 1
- Views: 490
Relationship Between Volume and # of States
Just looking for a bit of clarification after rereading my lecture notes for the second law of thermodynamics. I wrote down that the relationship between volume and the number of possible states is a ratio. What is that ratio again or how do we find it?