Search found 63 matches
- Thu Mar 14, 2019 9:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 18
- Views: 1951
Re: Final
I believe the newer material will be more emphasized
- Thu Mar 14, 2019 9:05 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-equilibrium approach
- Replies: 4
- Views: 400
Re: Pre-equilibrium approach
Thanks!
- Wed Mar 13, 2019 8:19 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-equilibrium approach
- Replies: 4
- Views: 400
Re: Pre-equilibrium approach
I know Lavelle mentioned the steady state approach but only went over the pre-equilibrium, so is the pre-equilibrium approach the only one we are expected to know?
- Wed Mar 13, 2019 8:14 pm
- Forum: Student Social/Study Group
- Topic: Lyndon's Review Session
- Replies: 8
- Views: 1504
Re: Lyndon's Review Session
I haven't heard of anything of what he is calling it this time but his review session I believe is on Saturday
- Wed Mar 13, 2019 12:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Questions
- Replies: 10
- Views: 1144
Re: Final Questions
I believe there will be 8 questions with some having multiple parts similar to how the midterm was.
- Wed Mar 13, 2019 12:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Topics
- Replies: 8
- Views: 787
Re: Final Exam Topics
Whatever is on the syllabus can be tested and Lavelle did finish the syllabus today in class so I believe Friday's lecture will be used for review
- Wed Mar 13, 2019 12:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lyndon's Review Sheets
- Replies: 9
- Views: 1277
Re: Lyndon's Review Sheets
I don't think he has posted anything yet but his review session is Saturday I believe so hopefully soon.
- Wed Mar 13, 2019 12:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sig Figs
- Replies: 9
- Views: 1111
Re: Sig Figs
I believe that typically sig figs do matter on an exam and will be graded, so I would say to be safe always try to have the correct sig figs written.
- Tue Mar 12, 2019 12:08 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Intermediates
- Replies: 8
- Views: 676
Re: Intermediates
LorenzoDuvergne3I wrote:What else was discussed today? I unfortunately couldn't make it because I was feeling ill.
The pre-equilibrium approach and the relationship between temperature and reaction rate and activation energy and reaction rate
- Mon Mar 11, 2019 5:41 pm
- Forum: General Science Questions
- Topic: Final
- Replies: 7
- Views: 1187
Re: Final
there is no curve for the class but in the syllabus, I believe it says there is a 50% required for a C- and I think he has mentioned before that after the finals grades are in he may make adjustments to the grading scale if he sees fit.
- Mon Mar 11, 2019 5:33 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Intermediates
- Replies: 8
- Views: 676
Re: Intermediates
today in lecture it was said that you can never have an intermediate in a rate law
- Mon Mar 11, 2019 5:32 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Meaning of k
- Replies: 4
- Views: 623
Re: Meaning of k
k is the rate constant and K is the equilibrium constant
- Mon Mar 11, 2019 5:31 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Frequency factor A
- Replies: 7
- Views: 763
Re: Frequency factor A
in lecture today it was explained that frequency factor, A, has to do with reactants must have correct orientation when they collide. Dr. Lavelle also mentioned when A increases k decreases
- Mon Mar 11, 2019 5:29 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Frequency Factor
- Replies: 5
- Views: 507
Re: Frequency Factor
from what was said in lecture frequency factor has to do with reactants having the correct orientation when they collide
- Sun Mar 10, 2019 1:14 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Microscopic reversibility
- Replies: 4
- Views: 452
Re: Microscopic reversibility
Microscopic reversibility is where one assumes that the reaction has the same pathway in the forward and reverse direction
- Sun Mar 10, 2019 12:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class Curve
- Replies: 11
- Views: 1718
Re: Class Curve
In the syllabus, it says that 50% is required to get a C-, and a C- is passing and is what is required to move on to the next course in the series.
- Sun Mar 10, 2019 12:50 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Gibbs Free energy and photosynthesis
- Replies: 4
- Views: 494
Re: Gibbs Free energy and photosynthesis
Thank you, that makes sense
- Wed Mar 06, 2019 12:23 pm
- Forum: General Rate Laws
- Topic: Unique rate of reaction
- Replies: 2
- Views: 355
Re: Unique rate of reaction
could someone explain how you go about solving for the unique rate using the equation I was a bit confused with how the solutions manual showed how to for this same homework question
- Wed Mar 06, 2019 12:21 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Gibbs Free energy and photosynthesis
- Replies: 4
- Views: 494
Gibbs Free energy and photosynthesis
On test 2 there was a question regarding if delta G was greater than, equal to or less than zero for the photosynthesis of glucose, could someone explain why the answer was that delta G <0
- Wed Mar 06, 2019 12:17 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Test #2
- Replies: 10
- Views: 1007
Re: Test #2
you should get it back in your discussion section this week
- Wed Mar 06, 2019 12:16 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Test 2
- Replies: 7
- Views: 783
Re: Test 2
On test 2 for another part of the same question it asked which 2 species would give the largest E cell, how do you determine this?
- Sun Feb 24, 2019 8:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: What topics are going to be on Test 2?
- Replies: 4
- Views: 439
Re: What topics are going to be on Test 2?
test 2 covers Gibb's free energy and electrochemistry excluding the Nernst equation and I believe there is a post on the class website about the topics as well.
- Wed Feb 13, 2019 1:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Homework Questions
- Replies: 2
- Views: 367
Re: Midterm Homework Questions
Everything that has been covered until Gibb's free energy can be tested, Gibb's free energy will not be included
- Wed Feb 13, 2019 12:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 6/7 homework
- Replies: 2
- Views: 350
Re: Week 6/7 homework
I think any topic is fair game for homework like you can do previous topic practice problems for week 6 and week 7 and probably whatever is covered Friday
- Mon Feb 11, 2019 6:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 1 Solutions
- Replies: 4
- Views: 495
Re: Test 1 Solutions
Last quarter solutions weren't offered so I would assume its the same this time as well
- Mon Feb 11, 2019 6:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Practice Midterm
- Replies: 3
- Views: 397
Re: Practice Midterm
Neil Hsu 2A wrote:Last quarter in 14A, TA/UA Lyndon always had a midterm review/practice midterm with a funky name. Does anyone know if there is one this midterm; if so, what is it called. Thanks!
I think its called Hotdog this time
- Mon Feb 11, 2019 6:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 6
- Views: 601
Re: Midterm
Lavelle said in lecture that everything up until before Gibb's free energy which was covered on Friday will be on the midterm
- Mon Feb 11, 2019 6:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3
- Replies: 10
- Views: 1104
Re: Test 3
Jchellis 1I wrote:We only have two tests this quarter for 14B though, right? Wasn't it changed?
I believe we only have the 2 tests in discussion this quarter for 14B
- Mon Feb 11, 2019 6:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Review
- Replies: 14
- Views: 1173
Re: Midterm Review
I believe in addition to the review sessions offered outside class the lectures this week before the midterm will also be review
- Mon Jan 21, 2019 5:42 pm
- Forum: Ideal Gases
- Topic: Concentration or Partial Pressure
- Replies: 13
- Views: 913
Re: Concentration or Partial Pressure
Shuyi Yu 1B wrote:When do we use concentration to find the equilibrium constant and when do we use partial pressure to find equilibrium constant? Will the question ask for one of the two specifically?
the question should normally specify which you should use
- Mon Jan 21, 2019 5:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Number of questions on test one [ENDORSED]
- Replies: 39
- Views: 21463
Re: Number of questions on test one [ENDORSED]
Louis Zhao 4C wrote:Is the test format multiple choice, free response or a mixture of both?
I believe the test will be all free response that is how the tests in discussion were formatted for 14a
- Mon Jan 21, 2019 5:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Temperature for Equilibrium
- Replies: 4
- Views: 288
Re: Temperature for Equilibrium
I believe most equilibrium expressions are at 25 C if not stated otherwise
- Mon Jan 21, 2019 5:32 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Strong acids and bases
- Replies: 4
- Views: 464
Re: Strong acids and bases
I think it would definitely be beneficial to memorize the common strong acid and bases.
- Sat Dec 08, 2018 2:06 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Distinguishing between the different intermolecular forces
- Replies: 9
- Views: 813
Re: Distinguishing between the different intermolecular forces
amogha_koka3I wrote:So regardless of the molecule being ionic or covalent, it has LDF?
yes all molecules have LDF present
- Sat Dec 08, 2018 2:01 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Why are LDFs everywhere?
- Replies: 3
- Views: 1113
Re: Why are LDFs everywhere?
LDF are always present in all molecules
- Sat Dec 08, 2018 2:01 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: boiling point
- Replies: 5
- Views: 1186
Re: boiling point
stronger intermolecular forces mean a high boiling point so whichever molecule has stronger forces, which in this case is NH3, will have a high boiling point.
- Sat Dec 08, 2018 1:58 pm
- Forum: Amphoteric Compounds
- Topic: What makes something amphoteric?
- Replies: 6
- Views: 790
Re: What makes something amphoteric?
something that is amphoteric has both basic and acidic character, which means it can accept an e- pair or donate one. Water is a common amphoteric substance
- Sat Dec 08, 2018 1:54 pm
- Forum: Amphoteric Compounds
- Topic: Difference between amphoteric and amphiprotic?
- Replies: 4
- Views: 857
Re: Difference between amphoteric and amphiprotic?
amphoteric: can act as either a base or an acid
amphiprotic: can donate or accept a proton
amphiprotic: can donate or accept a proton
- Sat Dec 08, 2018 1:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 11
- Views: 1277
Re: Final
Saima Salam 3J wrote:I also had a question about the final. Does anyone know how many questions would be on the final? Would it be similar to the midterm (8 questions)?
Lavelle said the final would be 8 questions, and I think it will be fairly similar to the midterm in that each question could have several parts to it.
- Sat Dec 08, 2018 1:45 pm
- Forum: Naming
- Topic: Regarding the test... [ENDORSED]
- Replies: 12
- Views: 5675
Re: Regarding the test... [ENDORSED]
I believe that we can still be tested on them since they were covered in lecture
- Sat Dec 08, 2018 1:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: About the test
- Replies: 8
- Views: 1018
Re: About the test
Brianna Brockman 3C wrote:All the stuff prior to the most recent test last week... can we assume that if it hasn't been tested in the tests or midterm that it won't be on the final? Or is literally everything fair game?
anything from the syllabus can be on the final
- Sat Dec 08, 2018 1:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Instructor Evaluations
- Replies: 4
- Views: 394
Re: Instructor Evaluations
Jchellis 1I wrote:Is this worth points?
I don't believe it is worth any points
- Sun Dec 02, 2018 9:09 pm
- Forum: Lewis Acids & Bases
- Topic: Bronsted vs. Lewis
- Replies: 3
- Views: 343
Re: Bronsted vs. Lewis
A bronsted acid is a proton donor and a bronsted base is a proton acceptor. A lewis acid is an electron acceptor and a lewis base is a electron donor.
- Sun Dec 02, 2018 9:04 pm
- Forum: Lewis Acids & Bases
- Topic: acid names
- Replies: 8
- Views: 677
Re: acid names
I'm not sure but it would probably be good to know the common ones like acetic acid and it wouldn't hurt to learn other ones as well.
- Sun Dec 02, 2018 9:01 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis and Bronsted
- Replies: 8
- Views: 794
Re: Lewis and Bronsted
A lewis acid is an electron acceptor and a bronsted acid is a proton donor.
A lewis base is an electron donor and a bronsted base is a proton acceptor.
A lewis base is an electron donor and a bronsted base is a proton acceptor.
- Sat Nov 24, 2018 8:58 pm
- Forum: Hybridization
- Topic: Regions of electron density
- Replies: 6
- Views: 701
Re: Regions of electron density
yes regions of electron density around the central atom equal the number of hybrid orbitals.
- Sat Nov 24, 2018 8:49 pm
- Forum: Hybridization
- Topic: Test 3
- Replies: 8
- Views: 798
Re: Test 3
yes I believe hybridization will be on test 3
- Sat Nov 24, 2018 8:41 pm
- Forum: Hybridization
- Topic: Sigma/Pi Bonds
- Replies: 5
- Views: 352
Re: Sigma/Pi Bonds
what is the significance of sigma/pi bonds?
- Sun Nov 18, 2018 3:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4 regions of electron density
- Replies: 3
- Views: 383
Re: 4 regions of electron density
are lone pairs and bonding pairs both considered regions of electron density?
- Sun Nov 18, 2018 3:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: lone pairs
- Replies: 11
- Views: 826
Re: lone pairs
how do lone pairs affect the shape and repulsion in a molecule
- Sun Nov 18, 2018 3:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 19
- Views: 1310
Re: Test 3
I believe we have to memorize them, but I think doing more practice problems will help to become more familiar with them.
- Sun Nov 11, 2018 7:23 pm
- Forum: Octet Exceptions
- Topic: electron affinity
- Replies: 6
- Views: 642
Re: electron affinity
are electron affinity and electronegativity related?
- Sun Nov 11, 2018 7:17 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 11
- Views: 1220
Re: Formal Charge
the formal charge being zero means that that is most stable structure for the molecule
- Sun Nov 11, 2018 7:15 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Equation
- Replies: 13
- Views: 3368
Re: Formal Charge Equation
the formula for formal charge is FC= valence - (lone pairs + (shared/2))
- Sun Oct 21, 2018 7:47 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: test 2 topics
- Replies: 3
- Views: 426
Re: test 2 topics
only the topics covered up to friday's lecture will be on test 2
- Sun Oct 21, 2018 7:47 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: spin part of orbitals?
- Replies: 5
- Views: 443
Re: spin part of orbitals?
is spin related to a specifc quantum number?
- Sun Oct 21, 2018 7:41 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Principal Quantum Number (n)
- Replies: 3
- Views: 325
Re: Principal Quantum Number (n)
n determines energy and shell size and the other quantum numbers l and ml determine shape and orientation.
- Sun Oct 14, 2018 7:10 pm
- Forum: Einstein Equation
- Topic: Einstein's Equation: E=hv
- Replies: 11
- Views: 1509
Re: Einstein's Equation: E=hv
h is Planck's constant, which is 6.63*10^-34 J*seconds and I believe it will be given on the formula sheet for tests.
- Sun Oct 14, 2018 7:08 pm
- Forum: Einstein Equation
- Topic: Combining E=hv and c=ƛv [ENDORSED]
- Replies: 7
- Views: 5268
Re: Combining E=hv and c=ƛv [ENDORSED]
Will the value of c normally be given for use of the equation E=hc/ƛ?
- Sun Oct 14, 2018 7:06 pm
- Forum: Einstein Equation
- Topic: Planck's Constant Value [ENDORSED]
- Replies: 7
- Views: 3331
Re: Planck's Constant Value [ENDORSED]
since I think the value is usually given I would use whichever they give.
- Sun Oct 07, 2018 3:18 pm
- Forum: General Science Questions
- Topic: Periodic Table
- Replies: 16
- Views: 1591
Re: Periodic Table
I typically use the exact number written on the table and wait to round anything until the very end.
- Sun Oct 07, 2018 3:14 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 415994
Re: Rusty on High School Chem [ENDORSED]
does anyone have any recommendations on resources to use to brush up on units and unit conversions?
- Sat Oct 06, 2018 9:21 pm
- Forum: SI Units, Unit Conversions
- Topic: Standard SI Unit, Question E1
- Replies: 3
- Views: 448
Re: Standard SI Unit, Question E1
is pm a commonly used unit?