Search found 59 matches
- Sat Mar 12, 2016 8:33 pm
- Forum: *Cycloalkanes
- Topic: Need Help Naming
- Replies: 2
- Views: 722
Re: Need Help Naming
I got the same name you did but cyclopentane rather than cyclohexane.
- Mon Mar 07, 2016 9:31 pm
- Forum: *Carboxylic Acids
- Topic: Functional groups vs. Substituents
- Replies: 2
- Views: 6646
Re: Functional groups vs. Substituents
So, basically, the difference is that functional groups may contain atoms other than C and H like N or O while substituents are only hydrocarbons?
- Mon Mar 07, 2016 9:30 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Conformations General Question
- Replies: 3
- Views: 717
Re: Conformations General Question
But for our final exam, we should only focus on the conformations given to us as those of the specific molecules right? Like cyclohexane would be chair? Thanks!
Re: Naming
Only iso and neo are included in the alphabetizing so when you have tert and sec, you alphabetize in regards to the molecule. Tert-butyl would be before sec-pentyl. Hope this helps!
- Tue Mar 01, 2016 10:57 am
- Forum: *Alkanes
- Topic: Naming Organic Compunds Help
- Replies: 1
- Views: 496
- Sun Feb 28, 2016 5:20 pm
- Forum: *Alkanes
- Topic: Quiz 3 Preparation
- Replies: 34
- Views: 12895
Re: Quiz 3 Preparation
So, on the quiz would both answers be correct?
- Tue Feb 23, 2016 12:48 pm
- Forum: *Enzyme Kinetics
- Topic: Determining Catalysts
- Replies: 3
- Views: 731
Re: Determining Catalysts
Ronald's got it down! Catalysts appear on the reactant side as well as on the product side at some point in a reaction mechanism.
- Tue Feb 23, 2016 12:46 pm
- Forum: *Alkanes
- Topic: Remembering the Prefixes for Organic Molecules
- Replies: 2
- Views: 1519
Re: Remembering the Prefixes for Organic Molecules
This is so awesome! Thank you!
- Thu Feb 18, 2016 2:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Going over the midterm
- Replies: 2
- Views: 636
Re: Going over the midterm
I would first talk to you TA about it because they are the one who grades it! Also, the sooner the better!
- Tue Feb 16, 2016 10:09 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: PreEquilibrium Approach
- Replies: 2
- Views: 561
Re: PreEquilibrium Approach
Thank you!!!
- Tue Feb 16, 2016 9:50 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: PreEquilibrium Approach
- Replies: 2
- Views: 561
PreEquilibrium Approach
Can someone explain to me the pre equilibrium approach. I am utterly confused and even after reading page 75 repeatedly, am still super confused. Thank sin advance!
- Mon Feb 15, 2016 10:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2
- Replies: 2
- Views: 565
Re: Quiz 2
just kinetics.
- Mon Feb 15, 2016 4:11 pm
- Forum: General Rate Laws
- Topic: Rate Law #7 (Quiz 2 Winter 2014)
- Replies: 2
- Views: 704
Re: Rate Law #7 (Quiz 2 Winter 2014)
The slow step determines the rate law!! So, because it has 2 NO's the rate law is Rate=k[NO]^2.
- Mon Feb 15, 2016 3:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Grades/Review
- Replies: 2
- Views: 704
Re: Midterm Grades/Review
Laval said they would be given out after the lecture times on Wednesday!
- Mon Feb 15, 2016 3:31 pm
- Forum: Second Order Reactions
- Topic: Quiz Prep 2 Winter 2015 #10
- Replies: 2
- Views: 716
Re: Quiz Prep 2 Winter 2015 #10
Thank you for the excellent response!^^
- Wed Feb 10, 2016 11:21 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Determining Increasing Standard Molar Entropy
- Replies: 2
- Views: 98463
Re: Determining Increasing Standard Molar Entropy
The more complex the molecule is, the higher the molar entropy. SO, since CF4 is the molecule with largest size and most complex (more particles such as protons, electrons, etc) it has the highest entropy of the molecules given. I hope this helps!
- Tue Feb 09, 2016 2:07 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Kj/mol or just kj?
- Replies: 1
- Views: 1049
Kj/mol or just kj?
I was wondering, when calculating say enthalpy, when you express it in just kj and when you express it in kj/mol. On my quiz i was marked down for expressing it in units of kj but i am confused as to when i use just kj and when i use kj/mol.
- Mon Feb 08, 2016 10:03 pm
- Forum: Calculating Work of Expansion
- Topic: Midterm 2012 Q5, Change in Volume
- Replies: 3
- Views: 665
Re: Midterm 2012 Q5, Change in Volume
For this same problem, why is the, for step 2, the internal energy equal to -50 J?
- Wed Feb 03, 2016 8:18 pm
- Forum: Balancing Redox Reactions
- Topic: Cell Potential and Balancing Half Reactions
- Replies: 1
- Views: 421
Cell Potential and Balancing Half Reactions
On 14.11 Homework problem it asks to write the half redox reactions in a galvanic cell which I know how to do, although I had a question regarding cell potential... if Ecell of Ni2+ (aq) + 2e- ---> Ni (s) is -.23 V, and you need the reverse reaction Ni(s)----> Ni2+ + 2e- would this reactions cell po...
- Tue Feb 02, 2016 3:58 pm
- Forum: Balancing Redox Reactions
- Topic: Identifying Oxidizing Agent and Reducing Agent
- Replies: 3
- Views: 687
Re: Identifying Oxidizing Agent and Reducing Agent
Oddly, it is backwards, so just remember that the species reduced is the oxidizing agent and the species oxidized is the reducing agent.
- Tue Feb 02, 2016 3:55 pm
- Forum: Balancing Redox Reactions
- Topic: Helpful Tip
- Replies: 2
- Views: 536
Re: Helpful Tip
This is super clever! Thank you!
- Tue Feb 02, 2016 3:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Score
- Replies: 2
- Views: 871
Re: Quiz 1 Score
Most TA's are handing them back this week in discussion!
- Thu Jan 28, 2016 2:18 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Reversible?
- Replies: 3
- Views: 737
Re: Reversible?
In almost all cases they will indicate whether the process is reversible or irreversible. But, if not, know that reversible have infinitely small volume changes where as irreversible have fairly larger volume changes. Reversible have potential to shift back to their equilibrium conditions whereas ir...
- Tue Jan 26, 2016 6:57 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: When to use the unit kJ/mol
- Replies: 2
- Views: 2099
Re: When to use the unit kJ/mol
Commenting on this because I had the same question!
- Mon Jan 25, 2016 10:13 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Question 9.30
- Replies: 1
- Views: 744
Re: Question 9.30
That or the amounts of particles each contains (electrons, protons, etc), states of the molecules, or how complex each is.
- Mon Jan 25, 2016 10:10 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Units of molar capacity
- Replies: 3
- Views: 481
Re: Units of molar capacity
A change in 1 kelvin is the same as a change in one degree celsius, correct? Thanks!
- Thu Jan 21, 2016 10:45 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Increase in Disorder
- Replies: 2
- Views: 839
Re: Increase in Disorder
Yes! Entropy is a measurement of disorder of a system so if there is an increase in disorder there will be an increase in the entropy which results in a spontaneous reaction. If the entropy is negatively charged then the reaction is not spontaneous and there's a decrease in entropy, etc. Hope this h...
- Tue Jan 19, 2016 11:28 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Entropy
- Replies: 2
- Views: 528
Re: Entropy
Extenisve properties are dependent on how much material/substance is present. So, entropy is an extensive property because it is dependent on how much substance is present.
- Tue Jan 19, 2016 11:23 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Useful Summary of Thermodynamic Definitions
- Replies: 55
- Views: 18346
Re: Useful Summary of Thermodynamic Definitions
Thank you!! :)
- Tue Jan 19, 2016 11:16 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Residual Entropy
- Replies: 3
- Views: 790
Re: Residual Entropy
So, when a compound has resonance, it typically has a higher entropy than a compound that does not have resonance?
- Tue Jan 19, 2016 11:14 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: degeneracy
- Replies: 3
- Views: 829
Re: degeneracy
Is degeneracy related to residual entropy?
- Thu Jan 14, 2016 10:52 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Problem 8.117
- Replies: 1
- Views: 293
Re: Homework Problem 8.117
never mind! i got it :D thank you haha
- Thu Jan 14, 2016 10:47 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Problem 8.117
- Replies: 1
- Views: 293
Homework Problem 8.117
I was wondering why the change of moles of the reaction CH4 + H2O YIELDS CO2 + 3 H2 was +2/3 moles? (with the production of 1 mole H2) This might be a dumb question because my brain is so fried but i cannot figure out why the delta n is 2/3.? Sorry and thanks ahead of time. :D
- Wed Jan 13, 2016 5:56 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.73 Bond Enthalpy of Benzene
- Replies: 4
- Views: 7288
Re: 8.73 Bond Enthalpy of Benzene
Regarding this problem, I just need clarification.... the more energy/enthalpy the more stable the molecule? For instance, the benzene structure that is higher in kj is the most stable, correct? :)
- Wed Jan 13, 2016 5:54 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Problem 8.51
- Replies: 2
- Views: 400
Re: Homework Problem 8.51
thank you!
- Tue Jan 12, 2016 10:59 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Problem 8.51
- Replies: 2
- Views: 545
Re: Homework Problem 8.51
Thank you!!!
- Mon Jan 11, 2016 8:51 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Problem 8.51
- Replies: 2
- Views: 545
Homework Problem 8.51
In this question it has the reaction 4 C7H5N3O6 + 21 O2 yields 28 CO2 + 10 H2O + 6 N2 When calculating the enthalpy for the entire reaction you do the sum of the enthalpies of the products minus that of the reactants. Although in the solutions manual, when calculating that, the enthalpy of the N2 wa...
- Mon Jan 11, 2016 8:46 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Problem 8.51
- Replies: 2
- Views: 400
Homework Problem 8.51
In this question it has the reaction 4 C7H5N3O6 + 21 O2 yields 28 CO2 + 10 H2O + 6 N2 When calculating the enthalpy for the entire reaction you do the sum of the enthalpies of the products minus that of the reactants. Although in the solutions manual, when calculating that, the enthalpy of the N2 wa...
- Thu Jan 07, 2016 9:25 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpies of bonds
- Replies: 3
- Views: 564
Re: Enthalpies of bonds
Thank you!! I think I was confusing enthalpy with entropy!!!! After reading chapter 9 I realized that my idea of enthalpy was mixed up with that of entropy. Thanks, again! :)
- Wed Jan 06, 2016 1:44 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpies of bonds
- Replies: 3
- Views: 564
Enthalpies of bonds
After reading chapter 8 and attending lecture, I struggled with understanding how the breakage of a bond is endothermic? The way my mind works (lol) is that when a bond breaks it would release energy and thus be exothermic and have a negative charged enthalpy. Same goes with the bond formation; I as...
- Wed Dec 02, 2015 11:31 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Determining pH of acids/bases
- Replies: 1
- Views: 419
Determining pH of acids/bases
Can someone explain to me why KBr has a neutral ph? Problem 71 from the 5th edition textbooks asks you to determine if the pH of specific molecules is less than, equal to, or greater than 7 and i had a difficult time determining the pH of KBr. Thanks!
- Mon Nov 23, 2015 10:35 am
- Forum: Empirical & Molecular Formulas
- Topic: Video: Midterm Question 2: Empirical & Molecular Formulas
- Replies: 1
- Views: 538
Video: Midterm Question 2: Empirical & Molecular Formulas
Video for 2015 Midterm Question 2: Empirical and Molecular Formula
by Stevie Wisz and Naiomi Desai
by Stevie Wisz and Naiomi Desai
- Tue Nov 17, 2015 10:49 pm
- Forum: Naming
- Topic: Naming Coordinate Compounds
- Replies: 2
- Views: 579
Re: Naming Coordinate Compounds
Alphabetize using the first letters of the ligands. Act as if there are no prefixes. Or in other words, ignore the prefixes and strictly pay attention to the first letters of the atoms not prefixes!
- Mon Nov 16, 2015 9:57 am
- Forum: Naming
- Topic: WorkBook Preparation for Quiz 3
- Replies: 1
- Views: 328
WorkBook Preparation for Quiz 3
I was wondering why, for number 3 on the second preparation Quiz for Quiz 3 in the workbook, why the chloride ion is listed before the ligand cyanide when naming the compound. I thought the ligand names go before the anions/metals? When i did the problem before checking my answer i had cyanochlorobi...
- Thu Nov 12, 2015 6:20 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate and Oxidation Numbers
- Replies: 4
- Views: 1285
Re: Polydentate and Oxidation Numbers
i am commenting because i am stuck on this problem too.
- Thu Nov 12, 2015 6:03 pm
- Forum: Naming
- Topic: Writing Formulas when given name of compound
- Replies: 1
- Views: 350
Writing Formulas when given name of compound
I was doing problem 17.31 from the textbook and was struggling with determining how to write the formulas without knowing if the compound inside the brackets has its own charge. For instance, pentaaminesulfatocoblalt (III) bromide: what is the correct formula? the inside's charge, when i calculated ...
- Sat Nov 07, 2015 10:36 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating Equilibrium Concentrations
- Replies: 2
- Views: 568
Calculating Equilibrium Concentrations
When Prof. Lavelle was going over how to calculate the concentrations of products/reactants using ICE Box method I was confused as to how you (for the change in concentration) get -X or +2X, etc. Can someone explain this a little more in depth please? I realize you look at the molar ratio but I just...
- Sat Nov 07, 2015 10:29 am
- Forum: Administrative Questions and Class Announcements
- Topic: Weekly Question
- Replies: 5
- Views: 1382
Re: Weekly Question
Does it HAVE to be a question or can it be replying to other's questions? For some reason theres no where for me to post on my screen or i just don't know how to do it I guess so I just comment to others for points. Does that count?
- Sat Nov 07, 2015 10:25 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order and Bond Length
- Replies: 2
- Views: 2635
Re: Bond Order and Bond Length
Bond order represents the number of bonds between two atoms/elements. So, because bond length decreases with multiplicity of bonds between two elements and increases with lesser amounts of bonds, the larger the Bond Order, the stronger the bond, the shorter the bond length and vice versa. Hope this ...
- Sat Nov 07, 2015 10:09 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: CIS/TRANS - NEVER FORGET IT AGAIN!!!
- Replies: 2
- Views: 529
Re: CIS/TRANS - NEVER FORGET IT AGAIN!!!
This is awesome!! Thanks for the laugh, I really needed it after my long week!!!
- Sat Nov 07, 2015 10:08 am
- Forum: Dipole Moments
- Topic: Polarity of XeF2
- Replies: 4
- Views: 17933
Re: Polarity of XeF2
I have a similar question regarding the polarity of PCl5... when working on this problem on the midterm last week I initially put that it was a non polar molecule do it its dimple moments canceling out and then i changed it to polar because I thought the molecule's dipole moments do not completely c...
- Tue Nov 03, 2015 12:01 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty in position
- Replies: 5
- Views: 1378
Re: Uncertainty in position
Regarding a problem similar like this: if you're given an electron confined to a radius 150 pm and another confined to a radius of greater than 150 pm and you calculate the uncertainty in velocity, how would you determine in which atoms can the velocity of the electron be known with the highest prec...
- Mon Oct 26, 2015 5:33 pm
- Forum: Lewis Structures
- Topic: Lone Pairs
- Replies: 1
- Views: 339
Re: Lone Pairs
Lone pairs are pairs of electrons that are not bonded to any other elements. So, if the central atom contains a set of two electrons (pair) that are not bonded to any other element they are classified as a lone pair. With that said, if there is an elements that has multiple pairs of these lone pairs...
- Mon Oct 26, 2015 5:29 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: formal charge
- Replies: 3
- Views: 662
Re: formal charge
so, say when comparing two resonance stuctures and everything is similar except one of the structures has a formal charge of -1 while the other has that of +1... what would be the more stable? the stucture with the positive 1? Thanks!
- Tue Oct 13, 2015 9:18 pm
- Forum: *Shrodinger Equation
- Topic: Chapter 1: Problem 33: Schrodinger Equation
- Replies: 2
- Views: 721
Re: Chapter 1: Problem 33: Schrodinger Equation
i think i was having difficulty because my book is a different version......
- Thu Oct 08, 2015 6:53 pm
- Forum: Properties of Electrons
- Topic: Homework Problems 1.33 and 1.37
- Replies: 1
- Views: 585
Homework Problems 1.33 and 1.37
I am working on completing all of the assigned homework problems and have come across some such as numbers 33 and 37 who have been very difficult for me. This is because Lavelle has not gone over these types of calculations. Will we be required to know how to calculate these types of problem on our ...
- Thu Oct 08, 2015 6:52 pm
- Forum: *Particle in a Box
- Topic: Problems: Particle in a box & Probability of Finding E-'s
- Replies: 3
- Views: 1422
Problems: Particle in a box & Probability of Finding E-'s
I am working on completing all of the assigned homework problems and have come across some such as numbers 33 and 37 who have been very difficult for me. This is because Lavelle has not gone over these types of calculations. Will we be required to know how to calculate these types of problem on our ...
- Wed Oct 07, 2015 3:36 pm
- Forum: *Shrodinger Equation
- Topic: Chapter 1: Problem 33: Schrodinger Equation
- Replies: 2
- Views: 721
Chapter 1: Problem 33: Schrodinger Equation
I recall Prof. Lavelle saying that we will not need to utilize the Schrodinger equation to calculate any values but will need to know just the basis and concept of it. Although, there was a problem assigned by Lavelle (#33) that required the use of the equation to calculate a specific value. I was v...
- Wed Oct 07, 2015 3:33 pm
- Forum: *Shrodinger Equation
- Topic: What exactly do we need to know about Schrodinger equation?
- Replies: 4
- Views: 916
Re: What exactly do we need to know about Schrodinger equati
I recall Prof. Lavelle saying that we will not need to utilize this equation to calculate any values but will need to know just the basis and concept of it. Although, there was a problem assigned by Lavelle that required the use of the equation to calculate a specific value. I was very confused by i...