Search found 17 matches
- Fri Mar 17, 2017 3:18 pm
- Forum: Phase Changes & Related Calculations
- Topic: 2017 final
- Replies: 1
- Views: 518
Re: 2017 final
Lavelle said that there would be at least one homework question on the exam yes
- Fri Mar 17, 2017 3:17 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Ring Flip: Final
- Replies: 2
- Views: 642
Re: Ring Flip: Final
If you're trying to demonstrate a ring flip I think either one would work, I'd probably go with the chair conformation though.
- Tue Mar 07, 2017 10:21 pm
- Forum: *Cycloalkenes
- Topic: benzene and phenyl
- Replies: 1
- Views: 438
benzene and phenyl
the structure of benzene looks like the structure of a cyclohexene but with 3 double bonds. Why is it called benzene rather than cyclohex-1,3,5-ene?
also, what is the structure of a phenyl group?
also, what is the structure of a phenyl group?
Re: Numbering
And if you started numbering on the side chains you would have to devise a whole new way of naming compounds to keep all the names standard
Re: Numbering
if you started numbering on the side chain you would et a different name for the molecule. Starting the numbering with the longest chain just provides scientists a basic and standard way to name these molecules
- Sun Feb 26, 2017 4:21 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: reaction intermediates
- Replies: 1
- Views: 413
reaction intermediates
this question is about the example used in section 15.7
so if we had the two elementary reactions
1. O3->O2+O
2. O3+O->O2+O2
O is a reaction intermediate
would O2 also be an intermediate?
so if we had the two elementary reactions
1. O3->O2+O
2. O3+O->O2+O2
O is a reaction intermediate
would O2 also be an intermediate?
- Sun Feb 26, 2017 3:33 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2759797
Re: Post All Chemistry Jokes Here
Bob: Hey Chris have you heard about this new band called endothermic reaction?
Chris: Ya I've been a fan of them since before they were cool
Chris: Ya I've been a fan of them since before they were cool
- Wed Feb 15, 2017 3:33 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2759797
Re: Post All Chemistry Jokes Here
A bear from the U.S. named Joe invites his cousin from Antarctica, Jeff, to go swimming. They both jump in the pool, but Jeff starts freaking because he thinks he's dissolving. Joe tells Jeff, "calm down bears are insoluble you're fine" and Jeff replies, "easy for you to say, you're n...
- Mon Feb 13, 2017 4:40 pm
- Forum: General Rate Laws
- Topic: reaction rate
- Replies: 1
- Views: 349
reaction rate
In class today on page 69 it says the rate of the reaction is k[NO2]^2. why is this so? I thought the reaction rate would be k[NO2] because the coefficient of NO2 is 1
- Tue Feb 07, 2017 12:19 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: example 15.4
- Replies: 1
- Views: 342
example 15.4
I get the whole process for this question and how they got the answer for k. but i don't understand the conclusion. The steps they showed concluded with them acheiving a value for k=0.04min^-1, but in the EVALUATE section it says k is equal to 6.7x10^-4. Why is this?
- Mon Feb 06, 2017 2:19 pm
- Forum: Balancing Redox Reactions
- Topic: example 14.9
- Replies: 1
- Views: 495
example 14.9
in example 14.9 why is the nr value equal to 2? shouldn't it be 1 as indicated by the redox reaction equation?
- Mon Feb 06, 2017 2:17 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy
- Replies: 4
- Views: 826
example 14.9
in example 14.9 why is the nr value 2 and not one as indicated by the redox equation?
- Sat Feb 04, 2017 11:06 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox Reactions in Basic Solution
- Replies: 2
- Views: 572
Re: Balancing Redox Reactions in Basic Solution
This can be answered by the tool box 14.1 in the book. step 1 identify the species being oxidized and the species being reduced from the changes in their oxidation numbers. step 2 Write the two skeletal (unbalanced) equations for the oxidation and reduction half-reactions. step 3 Balance all element...
- Sat Feb 04, 2017 11:01 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Reversible vs Irreversible
- Replies: 1
- Views: 550
Re: Reversible vs Irreversible
An example of a reversible reaction would be when you have a cylinder with a piston. And this container is filled with gas. now when this gas pushes on the piston it does work. The work this gas does on the piston is defined as reversible when the resistance the gas faces is always equal to the forc...
- Wed Jan 25, 2017 2:25 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: calculating entropy of vaporization
- Replies: 1
- Views: 1644
calculating entropy of vaporization
In example 9.6 you're supposed to add up the enthalpy required to bring the acetone form temp. 296k to 329.4k, the enthalpy required to vaporize the acetone, and the enthalpy lost when you bring the vapor's temperature back down to 296k. I don't understand the last step. why do we need to add this e...
- Sat Jan 21, 2017 10:23 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: energy changes
- Replies: 1
- Views: 445
energy changes
The textbook problem 8.17 states "Each of the pictures below shows a molecular view of a system undergoing a change at constant temperature. In each case, indicate whether heat is absorbed or given off by the system, whether expansion work is done on or by the system, and predict the signs of q...
- Sat Jan 14, 2017 8:52 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy
- Replies: 4
- Views: 826
Enthalpy
In the book it says that enthalpy is a state function. What does this mean? What is a state function?