Search found 17 matches

by kane_jajieh_3F
Fri Mar 17, 2017 3:18 pm
Forum: Phase Changes & Related Calculations
Topic: 2017 final
Replies: 1
Views: 288

Re: 2017 final

Lavelle said that there would be at least one homework question on the exam yes
by kane_jajieh_3F
Fri Mar 17, 2017 3:17 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Ring Flip: Final
Replies: 2
Views: 346

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.
by kane_jajieh_3F
Tue Mar 07, 2017 10:21 pm
Forum: *Cycloalkenes
Topic: benzene and phenyl
Replies: 1
Views: 234

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?
by kane_jajieh_3F
Sun Mar 05, 2017 6:51 pm
Forum: *Alkanes
Topic: Numbering
Replies: 2
Views: 223

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
by kane_jajieh_3F
Sun Mar 05, 2017 6:50 pm
Forum: *Alkanes
Topic: Numbering
Replies: 2
Views: 223

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
by kane_jajieh_3F
Sun Feb 26, 2017 4:21 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: reaction intermediates
Replies: 1
Views: 235

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?
by kane_jajieh_3F
Sun Feb 26, 2017 3:33 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1014777

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
by kane_jajieh_3F
Wed Feb 15, 2017 3:33 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1014777

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...
by kane_jajieh_3F
Mon Feb 13, 2017 4:40 pm
Forum: General Rate Laws
Topic: reaction rate
Replies: 1
Views: 160

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
by kane_jajieh_3F
Tue Feb 07, 2017 12:19 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: example 15.4
Replies: 1
Views: 161

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?
by kane_jajieh_3F
Mon Feb 06, 2017 2:19 pm
Forum: Balancing Redox Reactions
Topic: example 14.9
Replies: 1
Views: 303

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?
by kane_jajieh_3F
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: 497

example 14.9

in example 14.9 why is the nr value 2 and not one as indicated by the redox equation?
by kane_jajieh_3F
Sat Feb 04, 2017 11:06 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions in Basic Solution
Replies: 2
Views: 243

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...
by kane_jajieh_3F
Sat Feb 04, 2017 11:01 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Reversible vs Irreversible
Replies: 1
Views: 345

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...
by kane_jajieh_3F
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: 885

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...
by kane_jajieh_3F
Sat Jan 21, 2017 10:23 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: energy changes
Replies: 1
Views: 203

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...
by kane_jajieh_3F
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: 497

Enthalpy

In the book it says that enthalpy is a state function. What does this mean? What is a state function?

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