Search found 24 matches

by Ajith Raja 2L
Mon Mar 13, 2017 4:45 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: bond angles
Replies: 2
Views: 278

bond angles

I was wondering what the significance was of the bond angles since we keep talking about it. Is it basically that all the bond angles are 109.5 because the molecule is bound to 4 atoms? And angles less than that means there is strain and greater than that is something else? Thank you.
by Ajith Raja 2L
Fri Mar 10, 2017 1:17 pm
Forum: *Electrophiles
Topic: Nucleophile vs Electrophile
Replies: 5
Views: 1022

Nucleophile vs Electrophile

I had a question on identifying if something was an electrophile or a nucleophile. Doesn't it depend on what the molecule is surrounded by rather than the molecule itself? Because couldn't a molecule be a nucleophile but if it is surrounded by different molecules it could be an electrophile? Thank y...
by Ajith Raja 2L
Mon Mar 06, 2017 4:52 pm
Forum: *Alkanes
Topic: priority
Replies: 2
Views: 353

Re: priority

So does this also mean that alkynes have higher priority than alkenes?
by Ajith Raja 2L
Sun Mar 05, 2017 7:26 pm
Forum: *Alkanes
Topic: priority
Replies: 2
Views: 353

priority

Hello, I was wondering to what extent we would have to know priority? I know that alkanes have priority over halogens but this wasn't really mentioned in the course reader. Thank you.
-Ajith Raja
by Ajith Raja 2L
Thu Feb 23, 2017 1:46 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-Equilibrium Approach
Replies: 2
Views: 293

Pre-Equilibrium Approach

Hello, so the way I learned pre-equilibrium approach was to first write the rate law for the slow step. If there were intermediates in the rate law then you would continue, if not you were done. So does that mean if the slow step is the first step you are done after you write the rate law since you ...
by Ajith Raja 2L
Sat Feb 11, 2017 1:19 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.11d Solution manual error [ENDORSED]
Replies: 1
Views: 286

14.11d Solution manual error [ENDORSED]

Hello for part d of 14.11 the book says that the more positive reduction half reaction potential was the anode. But I remember reading that the more positive reduction half reaction potential was always the cathode. Thank you.
by Ajith Raja 2L
Tue Feb 07, 2017 2:05 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: delta G, K, and E [ENDORSED]
Replies: 1
Views: 312

delta G, K, and E [ENDORSED]

Hello so it seemed like all the equations for electrochemistry related G K and E together. Is this correct? Is there anything else that E relates to with an eq in the book that we have to know thats not in the course reader? Thank you.
by Ajith Raja 2L
Mon Jan 30, 2017 9:28 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 1
Views: 221

Salt Bridge

Hello I was just wondering if the CL- in the salt bridge can ever run out. Also do the ions just stay in the solution? They also dont go onto the electrode correct? Thank you.
by Ajith Raja 2L
Thu Jan 26, 2017 11:28 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: entropy and W
Replies: 1
Views: 257

entropy and W

Hello I was wondering that when we say if something has a higher entropy than something else, does this mean the W is also higher as well? Also whats the most complicated molecule level we should know how to find the degeneracy(W) of? Like are molecules like BOF2 high enough or should we know how to...
by Ajith Raja 2L
Sat Jan 21, 2017 2:06 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: delta U=q+w
Replies: 1
Views: 240

delta U=q+w

So I was looking at the reversible expansion area in the course reader in Ch.9. There is a part where as the piston pushes out, heat comes in to replace the energy so delta U is 0 since there is no change in temp. But couldnt you also say that q=0 since q=CdeltaT would make q 0? Or does the mcat equ...
by Ajith Raja 2L
Tue Jan 10, 2017 9:31 pm
Forum: Phase Changes & Related Calculations
Topic: expanding reversibly
Replies: 2
Views: 333

Re: expanding reversibly

But then if the pressure inside and outside match wouldn't the piston just stop expanding and not move? And when does the reversible process eventually have to travel in the opposite direction?
Thank you.
by Ajith Raja 2L
Mon Jan 09, 2017 11:37 pm
Forum: Phase Changes & Related Calculations
Topic: expanding reversibly
Replies: 2
Views: 333

expanding reversibly

Hello, so for reversible processes, a small change in the external p would cause a piston to move in and vice versa. What I dont understand is in a reversible isothermal expansion why does the external pressure have to decrease ? Is it so the piston would continue to move outwards? Also the book is ...
by Ajith Raja 2L
Fri Mar 11, 2016 10:12 pm
Forum: *Chem3D
Topic: conformations
Replies: 1
Views: 489

conformations

So for cyclohexane for example, the conformations are chair and boat correct? What do we need to know for these for the final? And do we have to know the conformations for bigger molecules like cycloheptane and octane? Thank you.
by Ajith Raja 2L
Sun Feb 28, 2016 2:30 pm
Forum: *Alkanes
Topic: QUiz 3 #4
Replies: 1
Views: 255

QUiz 3 #4

On the first quiz 3 prep #4 doesn't include the double bond in the parent chain. I thought the double bond was always in the parent chain.
by Ajith Raja 2L
Sun Feb 28, 2016 2:28 pm
Forum: *Alkanes
Topic: Quiz 3/Quiz 3 prep
Replies: 1
Views: 295

Quiz 3/Quiz 3 prep

On #2 on the first quiz 3 prep it give the compound CH3CH(CH3)CH(CH2CH3)C(CH3)3. the answer is 3 ethyl-2,2,4 trimethyl pentane. But im confused as to why we dont count from the other side. I dont get when we order alphabetically and which one we give the lower number. Thank you Also will quiz 3 only...
by Ajith Raja 2L
Tue Feb 16, 2016 11:52 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: K
Replies: 3
Views: 2126

K

Can someone help understand the constant K? Thank you. I greatly appreciate your help.
by Ajith Raja 2L
Tue Feb 09, 2016 3:43 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell notation
Replies: 1
Views: 269

cell notation

So is the left side always the anode and the right side is always the cathode? Sometimes in the book they refer to it as the opposite way which confuses me.
by Ajith Raja 2L
Sat Feb 06, 2016 1:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell notation
Replies: 1
Views: 566

cell notation

When you have multiple aqueous species separated by a comma, does it matter what order you write them in?
by Ajith Raja 2L
Fri Feb 05, 2016 7:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: half cell
Replies: 1
Views: 249

half cell

Can someone help me get a better understanding of a half cell? Im still confused on what it is after reading the book and the internet. Is it just an electrolyte solution with a "metal rod" thats a different metal than the one in the solution?
by Ajith Raja 2L
Wed Feb 03, 2016 8:29 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: delta H and bond enthalpy
Replies: 1
Views: 620

delta H and bond enthalpy

Im confused on the difference between delta H and bond enthalpy. On some problems we use the delta H of the reaction and use products -reactants but on other problems we change the signs because of the energy required or lost from bonds broken and formed.
by Ajith Raja 2L
Sat Jan 23, 2016 3:27 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: delta S
Replies: 4
Views: 480

Re: delta S

But I remember hearing that when temperature is zero, than delta S is also 0. Or is that wrong.
by Ajith Raja 2L
Fri Jan 22, 2016 4:59 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: delta S
Replies: 4
Views: 480

delta S

If delta S equals delta H/ temperature, does that mean the more you decrease temperature the higher delta S is?
by Ajith Raja 2L
Mon Jan 18, 2016 4:41 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: HW 8.25
Replies: 4
Views: 534

Re: HW 8.25

On the solutions manual, the change in temperature that is used is given in Kelvin. For example, they use 7.32K. However, in the problem, the temperature is given in Celsius. Don't we have to convert Celsius to Kelvin before we continue with the problem? If so, why is it not done in the solutions ma...
by Ajith Raja 2L
Wed Jan 13, 2016 9:45 pm
Forum: Phase Changes & Related Calculations
Topic: delta U
Replies: 2
Views: 681

delta U

Can someone help me understand what delta U is? Thank you

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