Search found 20 matches

by Tschlener 1E
Wed Mar 09, 2016 7:09 pm
Forum: *Calculations Using ΔG° = -RT ln K
Topic: Rate Order and DeltaG
Replies: 1
Views: 681

Re: Rate Order and DeltaG

I'm not certain, but I belive that the zero refers to the energy value for the energy conformation and because Anti has the lowest energy conformation it's zero. In order to calculate the Keq of 2 conformations, I believe we will need to be given their corresponding energy values for the conformatio...
by Tschlener 1E
Sat Mar 05, 2016 10:50 am
Forum: *Alcohols
Topic: Questions 2.25
Replies: 1
Views: 338

Questions 2.25

For this question I mistakenly answered it as 2,2-dimethylbutanal, but the answer is 3,3-dimethylbutanal. Since this was the case, I just assumed that the position of the alcohol bond took priority over the substituent, but I'm not sure if I got lucky or if that's the proper assumption to make... So...
by Tschlener 1E
Mon Feb 29, 2016 7:36 pm
Forum: *Cycloalkenes
Topic: Dienes
Replies: 1
Views: 313

Dienes

Are we going to need to include whether or not the diene is conjugated or unconjugated? Or is this something that will specifically be asked for?
by Tschlener 1E
Sat Feb 27, 2016 11:28 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: Homework 4.29
Replies: 1
Views: 314

Homework 4.29

For problem #29 in chapter 4 (graphing reaction profile for electrophilic addition run of HBr to CH3CHCH2 to make CH3CHBrCH3) how do we know to create the graph with the reactants higher than the products?
by Tschlener 1E
Wed Feb 24, 2016 3:17 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Self test 4.3B
Replies: 2
Views: 303

Re: Self test 4.3B

Ok, great! Thanks for clarifying
by Tschlener 1E
Wed Feb 24, 2016 2:20 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Self test 4.3B
Replies: 2
Views: 303

Self test 4.3B

Can someone please confirm that the answer to self test 4.3B in the Intro to O-chem (orange) course reader is a.

And if that's innocorect why is the answer B?
by Tschlener 1E
Fri Feb 19, 2016 4:09 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: questions 15.67 and 15.69
Replies: 1
Views: 457

questions 15.67 and 15.69

For questions 15.67 and 15.69 where does that formula come from? I see that it is part of the Arrhenius equation, but I'm not sure where the catalyzed and uncatalyzed aspects come from.
by Tschlener 1E
Tue Feb 16, 2016 2:07 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Homework 15.c
Replies: 1
Views: 295

Homework 15.c

For some reason I keep getting 2.8 for the value of k in part c of question 19. All I did was plug in the values from the chart and solve for k.

Is this the propper approach?
by Tschlener 1E
Mon Feb 08, 2016 11:23 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Delta S=q/t
Replies: 2
Views: 396

Re: Delta S=q/t

Okay great, thanks!
by Tschlener 1E
Mon Feb 08, 2016 11:14 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Delta S=q/t
Replies: 2
Views: 396

Delta S=q/t

If you are solving a problem to find the Delta Svap of a substance using the equation: Delta S=q/t and you are given the number of moles, the Delta Hvap,m and Tvap, would you do (Delta Hvap,m)/ (Tvap) and then multiply it by the number of moles OR.... would you just do (Delta Hvap,m)/ (Tvap)?? Basic...
by Tschlener 1E
Tue Feb 02, 2016 8:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: homework question 14.9
Replies: 3
Views: 460

Re: homework question 14.9

It has to deal with the difference in charge of each element I believe. For instance 3I^- (-3) --> I subscript 3 ^- (-1) there's a difference of 2 mols For 2Ce^4+ (+8) --> 2Ce ^3+ (6+) there's also a difference of 2 mols That's how I solved it, not sure if it's correct, but it seems to make sense.
by Tschlener 1E
Mon Feb 01, 2016 9:00 pm
Forum: Balancing Redox Reactions
Topic: Balancing Reactions
Replies: 1
Views: 239

Balancing Reactions

Does anyone know if Professor Lavell has a preference when balancing acidic reactions to add H2O in order to get rid of any H+ and make H3O?

Like can we leave H+ in an equation or do we need to convert it to H3O
by Tschlener 1E
Tue Jan 26, 2016 5:01 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Eq.
Replies: 2
Views: 597

Van't Hoff Eq.

In our course reader we see that the Van't Hoff eq is: lnk=(-deltaH/RT)+(delta S superscript 0/R) But then further down the page it say the eq is : ln(k1/k2)= (-deltaH superscript 0/R)[1/T2-1/T1] I know that these would be used in different instances, but my question is which equation is the formal ...
by Tschlener 1E
Fri Jan 22, 2016 4:49 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 9.103
Replies: 2
Views: 338

Re: 9.103

I did not find that compound on page A15 and I'm still confused as to why the solutions manual shows products minus reactants, but the reactants were substracted from eachother and not added.
by Tschlener 1E
Thu Jan 21, 2016 9:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: question 9.35
Replies: 1
Views: 296

question 9.35

For question 9.35 How are we supposed to know that a greater number of particles yields a greater entropy that vibrational motion of the particles? From a conceptual standpoint, I assumed that more movement equalled greater entropy (more disorder) than just strictly having more particles. Can anyone...
by Tschlener 1E
Mon Jan 18, 2016 10:06 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Ch. 9 #15
Replies: 3
Views: 1368

Re: Ch. 9 #15

I'm thinking the 6.01 kJ/mol becomes negative because that's the value for the fusion of water (solid to a liquid) and the problem wants us to go from a liquid to a solid so it would be the opposite, giving us -6.01 kJ/mol.

Not sure if this is correct, but this is how I disected the problem
by Tschlener 1E
Mon Jan 18, 2016 10:03 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Ch. 9 #15
Replies: 3
Views: 1368

Re: Ch. 9 #15

I too am unsure where the -6.01 kJ/mol comes from. I know that from table 8.3 the delta H fusion of water is 6.01 kJ/mol, but I'm not sure why it's negative... As for part b, all you have to do is convert the 50.0 grams of ethanol to mols by using the molar mass. then you multiply that by the delta ...
by Tschlener 1E
Tue Jan 12, 2016 1:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.49
Replies: 2
Views: 386

Question 8.49

I understand the processes that needs to be calculated to relate delta U to delta H, but what I don't understand is why the P delta V=Delta nRT is changed to a negative P delta V=Delta nRT. if you use the non negative version of the equation you end up with 2.48kJ then when you plug that into Delta ...
by Tschlener 1E
Mon Jan 11, 2016 5:31 pm
Forum: Phase Changes & Related Calculations
Topic: Self-Test 8.1A
Replies: 1
Views: 266

Self-Test 8.1A

How would we solve this question taking into account the opposing pressure?: "Water expands when it freezes. How much work does 100 g of water do when it freezes at 0.0 degrees C and pushes back the metal wall of a pipe that exerts an oppposing pressure of 1070 atm? The densities of water and i...
by Tschlener 1E
Sun Jan 10, 2016 8:13 pm
Forum: Phase Changes & Related Calculations
Topic: Steam
Replies: 2
Views: 278

Re: Steam

Also from the diagram we see steam going to water releases about 46 kJ of heat when it hits the skin. On the other hand, water releases about 5 kJ of heat when it hits the skin, therefore proving that a steam burn is much worse that a water burn at the same temperature

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