Search found 100 matches
- Thu Mar 12, 2020 7:40 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 4
- Views: 393
Re: Cell Diagram
You use a comma for substances that are in the same phase and you use | for substances that are in different phases.
- Thu Mar 12, 2020 7:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chemistry community posts
- Replies: 3
- Views: 302
Re: Chemistry community posts
I am not so sure, however, I think that if you have 100 posts to your account, you should be good.
- Thu Mar 12, 2020 7:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Equation Sheet on Final
- Replies: 2
- Views: 299
Equation Sheet on Final
I know that the final will be online, however, will the final have an equation sheet attached to it or will we have to provide our own equation sheet?
- Thu Mar 12, 2020 7:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Excellence in Chemistry Award!
- Replies: 27
- Views: 9899
Re: Excellence in Chemistry Award!
congratulations!! this is such a big award and we are all so proud of you! can't wait for you to be a UA ????
- Thu Mar 12, 2020 7:06 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: E cell
- Replies: 6
- Views: 461
Re: E cell
I think that it will be given to us. Considering they were given on the midterm, I think that it will be provided.
- Thu Mar 12, 2020 7:04 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: What was your favorite chem topic?
- Replies: 137
- Views: 10083
Re: What was your favorite chem topic?
I liked chemical equilibrium because it was so easy. However, conceptually, I found galvanic cells to be really cool. Did I know how to solve them? No. But did I think they were interesting? Yes.
- Thu Mar 12, 2020 6:40 pm
- Forum: Student Social/Study Group
- Topic: Class Grading
- Replies: 44
- Views: 3557
Re: Class Grading
After having taken the class, I can confirm that there is no curve. The amount of points you receive is the exact grade you get in the class. The only "curve" he does is gives you a C- if you get at least 250 points. I can second this and that getting a 250 points gives a C- Thank you for...
- Thu Mar 12, 2020 12:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final
- Replies: 14
- Views: 928
Re: final
It must be such a hard time for Lavelle and the staff, since their entire course ending was cut off short. So I think, although we do have to wait a long time, it is best for us to wait and give Lavelle the appropriate amount of time to think of the best solution.
- Thu Mar 12, 2020 12:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thursday and Friday Answer Keys
- Replies: 2
- Views: 356
Re: Thursday and Friday Answer Keys
Thank you!
- Thu Mar 12, 2020 12:21 pm
- Forum: General Rate Laws
- Topic: Factors Affecting k
- Replies: 83
- Views: 4628
Re: Factors Affecting k
It can only change with temperatures.
- Mon Mar 09, 2020 9:01 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: How does K change during compression/expansion?
- Replies: 6
- Views: 904
How does K change during compression/expansion?
How will the equilibrium composition of a reaction mixture change if a system is compressed / expanding.
- Mon Mar 09, 2020 8:42 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: What do we do when we are faced with a cubic equation?
- Replies: 2
- Views: 206
What do we do when we are faced with a cubic equation?
I know that sometimes we need to use the quadratic formula to solve for concentrations, but, what do we do when we are faced with a cubic equation? How do we solve for that?
- Mon Mar 09, 2020 8:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 2020 UA Picture!!!
- Replies: 2
- Views: 251
Re: 2020 UA Picture!!!
aww i love my UAs !! thank you for all your hard work :))))
- Sun Mar 08, 2020 11:31 pm
- Forum: Student Social/Study Group
- Topic: Midterm and Final Question
- Replies: 18
- Views: 1030
Re: Midterm and Final Question
Look out for Lyndon's study packets, they are very helpful and he usually has a big review session where he explains the answers. In my experience, they have helped a lot and are sometimes harder than the actual midterm/final, so they definitely prepare you well. Yes, Lyndon is such a great UA and ...
- Sun Mar 08, 2020 11:29 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Standard Delta G vs Non-Standard Delta G
- Replies: 4
- Views: 334
Re: Standard Delta G vs Non-Standard Delta G
Delta G just means that the compound is in Standard Conditions. What this means is that it is at 1.0 atm, 25 degrees Celcius, and 1 Molarity.
- Sun Mar 08, 2020 11:27 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 6
- Views: 444
Re: Cell Diagram
Cindy Adiwidjaja 1B wrote:You can have any state of matter in a cell diagram. This was proven in class when Dr. Lavelle showed examples of cell diagrams that had (l), (aq), and (s).
Additionally, the different state of matters are separated by vertical lines in the written convention.
Ex) Cu(aq)|H2O(l)
- Sun Mar 08, 2020 11:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 6
- Views: 444
Re: Cell Diagram
You can have any state of matter in a cell diagram. This was proven in class when Dr. Lavelle showed examples of cell diagrams that had (l), (aq), and (s).
- Sun Mar 08, 2020 11:24 pm
- Forum: Balancing Redox Reactions
- Topic: Cathode and Anode
- Replies: 24
- Views: 1570
Re: Cathode and Anode
It is just standard convention that we travel from the anode to the cathode. When a cell is working spontaneously and naturally, then it will always travel from left to right.
- Sun Mar 08, 2020 11:23 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: finding n in G=-nFE
- Replies: 15
- Views: 1011
Re: finding n in G=-nFE
"n" is the number of balanced electrons on both sides.
- Sun Mar 08, 2020 11:22 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Concentration cell
- Replies: 8
- Views: 579
Re: Concentration cell
A concentration cell has the same substance in both the anode and cathode. The only difference is their concentration. A galvanic cell has two different substances.
- Sun Mar 08, 2020 10:53 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Delta E
- Replies: 11
- Views: 779
Re: Delta E
Both delta E and delta U are used as notations for internal energy. You can interchange them
- Sun Mar 08, 2020 10:51 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: G(not) and G
- Replies: 15
- Views: 725
Re: G(not) and G
Whenever there is a ⁰ on anything (G, H, S), it means that that process is in Standard Conditions.
- Sun Mar 08, 2020 10:50 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Study Advice
- Replies: 73
- Views: 6863
Re: Study Advice
Khan Academy and The Organic Chemistry Tutor on Youtube are both really helpful to me.
- Sun Mar 08, 2020 10:48 pm
- Forum: General Rate Laws
- Topic: Rate limiting step
- Replies: 12
- Views: 810
Re: Rate limiting step
It is the slowest
- Sun Mar 08, 2020 10:48 pm
- Forum: Balancing Redox Reactions
- Topic: Why do we flip E for oxidation?
- Replies: 13
- Views: 1116
Re: Why do we flip E for oxidation?
Will we always be given E for reduction? Is that just common convention or will there be a time when we get oxidation?
- Sun Mar 08, 2020 10:43 pm
- Forum: Ideal Gases
- Topic: When do we change PV=NRT into deltas?
- Replies: 4
- Views: 451
When do we change PV=NRT into deltas?
I know that sometimes we can manipulate the equation to get deltas, however, what specifically gets turned into delta?
- Sun Mar 08, 2020 10:41 pm
- Forum: Student Social/Study Group
- Topic: Class Grading
- Replies: 44
- Views: 3557
Re: Class Grading
After having taken the class, I can confirm that there is no curve. The amount of points you receive is the exact grade you get in the class. The only "curve" he does is gives you a C- if you get at least 250 points.
- Sun Mar 08, 2020 10:33 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff equation
- Replies: 11
- Views: 1244
Re: Van't Hoff equation
Although derivations of equations will not be on any tests, it is still important to understand them conceptually. So I would say just know it.
- Sun Mar 08, 2020 10:29 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Application
- Replies: 6
- Views: 475
Re: Application
A couple of ways you can manipulate Gibbs Free Energy is by using these two equations:
G=-nFE
G=-RTlnQ
You can make them equal each other, take the standards of them, and even switch the Q to K.
G=-nFE
G=-RTlnQ
You can make them equal each other, take the standards of them, and even switch the Q to K.
- Sun Mar 08, 2020 10:25 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: K
- Replies: 5
- Views: 405
Re: K
I think it is easier to understand it conceptually rather than memorize the numbers. If E is positive, that means that the products are favored, which means that K is also positive.
- Sun Mar 08, 2020 10:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 9
- Replies: 5
- Views: 409
Re: HW 9
I understand that we need to do homework covered in the outline we learned, however, is it ok if we do homework from other outlines we did in the past?
- Sun Mar 08, 2020 10:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How do we access Sapling Learning
- Replies: 2
- Views: 196
How do we access Sapling Learning
I understand that Dr. Lavelle suggests Sapling Learning as a resource, however how do we access it? Do we need to pay?
- Sun Mar 08, 2020 10:02 pm
- Forum: Balancing Redox Reactions
- Topic: Why do we flip E for oxidation?
- Replies: 13
- Views: 1116
Why do we flip E for oxidation?
I know that E is given, however, why do we need to flip the sign when we are trying to use the E for oxidation?
- Sun Mar 08, 2020 9:57 pm
- Forum: Balancing Redox Reactions
- Topic: Cathode and Anode
- Replies: 24
- Views: 1570
Re: Cathode and Anode
The cell will continue to do work until it dies. So E has to be positive.
- Sun Mar 08, 2020 9:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 Grades
- Replies: 22
- Views: 1214
Re: Test 2 Grades
Historically, we always get out tests back in our discussion sections the following week. Therefore, expect to get yours during Week 10 Dis.
- Sun Mar 08, 2020 9:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 100 or 50 posts?
- Replies: 8
- Views: 584
100 or 50 posts?
So since a majority of us took Chem 14A with Dr. Lavelle and had previous posts, when we finish all of our posts for this quarter, would it be ok if we have 100 posts (since 50 are from last quarter). Or do we need to delete our first 50 posts?
- Sun Mar 08, 2020 9:33 pm
- Forum: General Science Questions
- Topic: Who makes the Final
- Replies: 23
- Views: 1386
Re: Who makes the Final
Do you guys know if the TAs made Test 2, because I felt like it was formatted much differently than the other tests.
- Sun Mar 08, 2020 5:28 pm
- Forum: General Rate Laws
- Topic: derivations?
- Replies: 5
- Views: 393
Re: derivations?
I remember that Dr. Lavelle said that in class, we are only doing the derivations so we as students can understand what we are doing. However, the test will not be on your mathematical skills. So no derivations.
- Sun Mar 08, 2020 5:25 pm
- Forum: Calculating Work of Expansion
- Topic: Irreversible and Reversible Expanision
- Replies: 9
- Views: 673
Re: Irreversible and Reversible Expanision
So far, we have only been exposed to questions that has this information given.
- Sun Mar 08, 2020 5:24 pm
- Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
- Topic: Will the Final for 14B have Identification?
- Replies: 9
- Views: 5944
Will the Final for 14B have Identification?
I do not think we learned this in Chem 14B (yet) so I was wondering if this is going to be on the Final
- Sun Mar 08, 2020 5:21 pm
- Forum: General Science Questions
- Topic: Who makes the Final
- Replies: 23
- Views: 1386
Who makes the Final
Do the TAs make the final or does Dr. Lavelle make the final?
- Sun Mar 08, 2020 5:21 pm
- Forum: General Science Questions
- Topic: Test 2 Grades [ENDORSED]
- Replies: 23
- Views: 1572
Re: Test 2 Grades [ENDORSED]
VLi_2B wrote:TimVintsDis4L wrote:I wouldn't be surprised if we get our tests back on Wednesday as the Ta's might have to work on the final so they get the tests over with first.
Do the TAs make our final or Dr. Lavelle?
This is a good question. I'm not too sure but would like to know
- Sun Mar 08, 2020 5:20 pm
- Forum: Van't Hoff Equation
- Topic: derivation?
- Replies: 3
- Views: 392
Re: derivation?
I think we mainly do the derivation so we can understand where the equation is coming from. In the event that you do not remember an equation, knowing the derivation is good so you can create the equation for yourself.
- Wed Mar 04, 2020 4:43 pm
- Forum: General Science Questions
- Topic: Test 2 Grades [ENDORSED]
- Replies: 23
- Views: 1572
Test 2 Grades [ENDORSED]
Does anyone know when we will be getting our grades for Test 2? Will it be next week wednesday?
- Sat Jan 11, 2020 10:49 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Week 1 lecture note
- Replies: 4
- Views: 227
Re: Week 1 lecture note
Thank you so much! Are you a TA or UA? If so, can we know who you are so we can attend your sessions, because these notes are very helpful!
- Sat Jan 11, 2020 10:40 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc vs. Kp [ENDORSED]
- Replies: 4
- Views: 286
Re: Kc vs. Kp [ENDORSED]
When dealing with gases, we assume that we have to use Kp since gases have pressure. When dealing with aqueous solutions, we assume that we use Kc since aqueous solutions have concentrations.
- Sat Jan 11, 2020 10:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating K
- Replies: 5
- Views: 166
Re: Calculating K
We do not include solids and liquids when we calculate K because they stay constant and will ultimately have no effect on K. If you did want to include it, then you would still be essentially adding it to the top (products) and bottom (reactants) and they would still divide out to be 1.
- Thu Jan 09, 2020 11:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: New Account for 14B?
- Replies: 2
- Views: 188
New Account for 14B?
Yay we all finished 14A and are now in 14B woohoo! I know that again for this quarter, we must post 5 posts every week, however, I realized that our accounts for Chemistry Community are linked with our UIDs, and that this is the same account we had for last quarter too. What this means is that our a...
- Thu Jan 09, 2020 11:38 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Do solids and liquids count in Q?
- Replies: 5
- Views: 204
Do solids and liquids count in Q?
So I know that for K, pure substances like solids and liquids do not change and therefore are not calculated into the K equilibrium. However, for the reaction quotient, Q, do we also not include these in our calculations?
- Sun Dec 08, 2019 6:18 pm
- Forum: General Science Questions
- Topic: 50 post grade
- Replies: 25
- Views: 1793
Re: 50 post grade
Yes, it depends on the TA. Some check every week while others check at the end of the quarter. Honestly, since the TAs have so many students, I am pretty sure they just check to see if you have 50 at the end of the quarter. So, in the event that you do not, just make sure you reach 50 by tonight.
- Sun Dec 08, 2019 6:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thank You!!
- Replies: 1
- Views: 170
Thank You!!
I just wanted to say thank you to everyone I have met in Chem 14A. It has truly been a roller coaster and I am so glad that it is finally done! I have met some incredible people in Chem 14A and I hope to see all of you again in Chem 14B. Thank you so much to all the TAs, UAs, and Dr. Lavelle. This h...
- Sun Dec 08, 2019 6:10 pm
- Forum: General Science Questions
- Topic: Curve
- Replies: 9
- Views: 890
Re: Curve
Does that mean that people who got Fs and Ds will have the exact same grade as people who actually got C-s. Or will the people who got C-s have slightly higher grades?
- Sun Dec 08, 2019 6:08 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 341685
Re: Final Jitters
I honestly find listening to calming music to be really helpful. Listen to some slow and calming music while you study so you do not feel overwhelemd.
- Sun Dec 08, 2019 6:06 pm
- Forum: Bronsted Acids & Bases
- Topic: Hydrogen Bonding
- Replies: 16
- Views: 1056
Re: Hydrogen Bonding
No, this is a type of intermolecular force. Not an acid and base reaction
- Sun Dec 08, 2019 6:05 pm
- Forum: Lewis Acids & Bases
- Topic: What does it mean when something is strong?
- Replies: 8
- Views: 604
What does it mean when something is strong?
I know that there are strong acids and strong bases, but what does it actually mean?
- Wed Dec 04, 2019 12:48 am
- Forum: Conjugate Acids & Bases
- Topic: H-F in conjugate bases
- Replies: 3
- Views: 269
Re: H-F in conjugate bases
The other conjugate bases are not as strong, meaning they can not produce the same outcome as H-F can.
- Tue Nov 26, 2019 12:17 pm
- Forum: Student Social/Study Group
- Topic: Class Grading
- Replies: 44
- Views: 3557
Re: Class Grading
I saw from previous years' posts that Lavelle also adds 10 points to every one's score out of 500. I do not know if this is still true, but this popped up a lot in Chemistry Community.
- Tue Nov 26, 2019 12:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture on 11/27
- Replies: 4
- Views: 326
Re: Lecture on 11/27
Yes, Dr. Lavelle sent out an email saying that we will have class and discussion sections on wednesday.
- Tue Nov 26, 2019 12:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 7
- Views: 268
Re: Test 2
Because half of the students will not have discussion this week, I believe the staff said we will get our test 2 back in week 10
- Tue Nov 26, 2019 12:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: finals
- Replies: 5
- Views: 268
Re: finals
The final is cumulative, meaning it will cover everything since Week 1, including things we have already been tested on.
- Tue Nov 26, 2019 12:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Difficulty
- Replies: 14
- Views: 888
Re: Difficulty
Coming from an underfunded and underprivileged high school, my only experience with Chemistry was during sophomore year, and was extremely unhelpful in terms of how it relates to this current class. I am struggling a lot in Chem 14A, and because the topics covered seems to by review for every one el...
- Tue Nov 26, 2019 12:06 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis and Bronsted
- Replies: 5
- Views: 353
Re: Lewis and Bronsted
Lewis Acids and Bases involve ELECTRON transfers, while Bronsted Acids and Bases involve PROTONS.
- Tue Nov 26, 2019 12:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Points
- Replies: 11
- Views: 735
Re: Points
In terms of the grading, I don't know if we are getting graded on a week to week basis, or at the end of the quarter. Some people say that if we have 50 by the end of the quarter we get all the points, but others say that we need to do 5 a week or else we do not get the points. If anyone knows the a...
- Tue Nov 26, 2019 12:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Points
- Replies: 11
- Views: 735
Re: Points
On Chemistry Community, every time you post something, you should see a number on the side of your name for your post. This number tells you how many posts you have made.
- Tue Nov 26, 2019 12:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 9 Homework
- Replies: 2
- Views: 141
Week 9 Homework
So I understand that Lavelle said that the homework for week 9 can be turned in during week 10 because of Thanksgiving break, however, if we have section this week that is not cancelled due to thanksgiving break, do we still turn in our homework?
- Tue Nov 26, 2019 11:59 am
- Forum: Resonance Structures
- Topic: What is a Resonance "Structure"
- Replies: 12
- Views: 990
Re: What is a Resonance "Structure"
Oh ok I see, thank you for helping!
- Tue Nov 26, 2019 11:58 am
- Forum: Administrative Questions and Class Announcements
- Topic: Video Modules
- Replies: 5
- Views: 259
Re: Video Modules
Yea I suppose you guys are right because the Video Modules were also very old. He probably does not have any other videos of his lessons.
- Tue Nov 26, 2019 11:56 am
- Forum: General Science Questions
- Topic: Chemistry Community Questions
- Replies: 5
- Views: 413
Re: Chemistry Community Questions
Yea I was confused because sometimes the dates for my posts are extremely off, saying that I posted in June of something, so I was unsure if the dates and 5 per week will still be taken into account even if the weeks are incorrect.
- Tue Nov 26, 2019 11:54 am
- Forum: Student Social/Study Group
- Topic: Test 2 and Final
- Replies: 18
- Views: 886
Re: Test 2 and Final
I heard that the TAs that already had section this week gave back test 2, but I am not quite sure. And in terms of the final, it will cover everything, even midterm stuff.
- Mon Nov 11, 2019 11:49 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Calculating formal charge
- Replies: 4
- Views: 249
Re: Calculating formal charge
Another way to think of it is to envision the electrons in the whole lewis structure, not in a singular atom. By looking it at a bigger picture, it will help.
- Mon Nov 11, 2019 11:34 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: nomenclature
- Replies: 3
- Views: 271
Re: nomenclature
Additionally, which nomenclatures should we already know? Its been a while since I took high school Chemistry, and I do not remember any chemical compounds other than water and carbon dioxide/monoxide. What others do we need to know?
- Mon Nov 11, 2019 11:14 am
- Forum: Administrative Questions and Class Announcements
- Topic: Video Modules
- Replies: 5
- Views: 259
Video Modules
The video modules that Lavelle posts on his website are extremely helpful, but does anyone know if he will post a video module for every topic we go over? So far, only the early Quantum unit is on his website, however, will there ever be any more?
- Mon Nov 11, 2019 11:12 am
- Forum: General Science Questions
- Topic: Chemistry Community Questions
- Replies: 5
- Views: 413
Chemistry Community Questions
I know that we need to submit 5 questions per week, however, is this checked on a weekly basis, or can we just end the quarter off with 50 posts, regardless of when they were posted. I know some people who do not do 5 a week, but are doing it at random times. By the end of the quarter, if we meet th...
- Mon Nov 11, 2019 11:05 am
- Forum: Ionic & Covalent Bonds
- Topic: Resonance (all bonds are a hybrid of different bonds)
- Replies: 10
- Views: 387
Re: Resonance (all bonds are a hybrid of different bonds)
Kayla Maldonado 1A wrote:How can you tell if a compound has resonance and do all resonance forms need to be drawn when being asked for a lewis dot diagram?
To my knowledge, any structure with non-single bonds has resonance. In terms of depicting it, I think everyone else who replied is right.
- Mon Nov 11, 2019 11:02 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Shape of Orbitals?
- Replies: 6
- Views: 354
Re: Shape of Orbitals?
Dr. Lavelle said that we do not need to worry about orbital shape for any test we encounter.
- Mon Nov 11, 2019 11:01 am
- Forum: Student Social/Study Group
- Topic: Midterm Grades
- Replies: 7
- Views: 513
Re: Midterm Grades
To my knowledge, I heard that the TAs have until Tuesday to finish grading all the Midterms, therefore, the earliest we can get them back is Wednesday
- Mon Nov 11, 2019 10:52 am
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 163616
Re: How to find my posts
Whenever you post something, there is a box on the right side of your post that has your information on it. Next to your name, there should be a number. By clicking that number, you can see all your posts, questions and replies, and can easily access all of your old work.
- Mon Nov 11, 2019 10:50 am
- Forum: Lewis Structures
- Topic: Lewis Dot Structures
- Replies: 7
- Views: 375
Re: Lewis Dot Structures
With any Lewis Dot Structure, it is best to figure out which atoms have the lowest possible Formal Charge. By manipulating the dot structure and figuring out which combination has the lowest dot structure, you should be fine.
- Mon Nov 11, 2019 10:47 am
- Forum: Resonance Structures
- Topic: how to draw
- Replies: 6
- Views: 432
Re: how to draw
Although we were faced with both types of examples, Lavelle usually draws them out separately, as multiple different structures with different type of bond arrangements, so I think we should stick to that.
- Mon Nov 11, 2019 10:43 am
- Forum: Resonance Structures
- Topic: What is a Resonance "Structure"
- Replies: 12
- Views: 990
What is a Resonance "Structure"
I understand that resonance is when a bond is a hybrid of a single and double, for example. However, I thought that the word "resonance" only applied when describing the bond type. Sometimes in class, Lavelle talks about Resonance "Structures". What is that exactly, if it is not ...
- Sat Oct 26, 2019 5:40 pm
- Forum: Bond Lengths & Energies
- Topic: Bond length strength
- Replies: 6
- Views: 309
Re: Bond length strength
All bond lengths we have been exposed to were given to us in the problem. Dr. Lavelle stated that these lengths were found through experimental data calculations and that we were specifically not going to get too in depth into that.
- Sat Oct 26, 2019 5:39 pm
- Forum: Ionic & Covalent Bonds
- Topic: Calculating Number of Valence Electrons
- Replies: 7
- Views: 570
Re: Calculating Number of Valence Electrons
When dealing with elements in the s and p blocks, just count the elements from left to right, SKIPPING the d block, until you get to your desired element. For example, for Oxygen, the elements in that row are Li, Be, B, C, N, O, F, Ne. In that order, Oxygen is the 6th element. Thus, Oxygen has 6 val...
- Sat Oct 26, 2019 5:33 pm
- Forum: Ionic & Covalent Bonds
- Topic: Resonance (all bonds are a hybrid of different bonds)
- Replies: 10
- Views: 387
Resonance (all bonds are a hybrid of different bonds)
In class, Dr. Lavelle said that in compounds with resonance, all bonds are really just a mix of different double and single bonds and that they are a hybrid of the two. In that case, how can we depict the most accurate bond type when drawing lewis structures?
- Sat Oct 26, 2019 5:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Cation
- Replies: 23
- Views: 1738
Re: Cation
Everyone here is correct with their answers, however I wanted to give a quick tip on how I remember the difference.
For Cation (positive charge), I just think of the "t" as a "+(plus sign)"
For Anion, I just think of the "n" as a "Negative"
For Cation (positive charge), I just think of the "t" as a "+(plus sign)"
For Anion, I just think of the "n" as a "Negative"
- Tue Oct 22, 2019 12:03 am
- Forum: Ionic & Covalent Bonds
- Topic: Week 4 Homework
- Replies: 9
- Views: 447
Week 4 Homework
For this week, are we supposed to do the homework based on the Quantum World, or based on the Ionic and Covalent Bonds?
- Sun Oct 20, 2019 6:17 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 3418
Re: Best Way To Study?
I was going over the chapters in the textbook and I realized that Dr. Lavelle didn't go over some topics. Do we still need to know these or will only the content he introduces us in class be on the tests?
- Sun Oct 20, 2019 6:13 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Stern and Gerlach
- Replies: 3
- Views: 149
Re: Stern and Gerlach
So does that mean that an electron would shift from spin up to spin down, since orbitals are basically circular?
- Sun Oct 20, 2019 6:06 pm
- Forum: Properties of Light
- Topic: Explanation of Balmer and Lyman Series
- Replies: 4
- Views: 231
Re: Explanation of Balmer and Lyman Series
So does this imply that in common everyday life, electrons are constantly jumping from energy levels and that the spectrum just depicts what specific regions this occurs?
- Sun Oct 20, 2019 6:02 pm
- Forum: DeBroglie Equation
- Topic: When to combine equations
- Replies: 10
- Views: 541
When to combine equations
So in class we constantly use multiple equations when solving a question, and sometimes we manipulate equations to help us solve. However, how do we know when we can manipulate them and combine them to solve our questions? De Broglie's Equation is the mixture of two different equations, so it seems ...
- Sun Oct 20, 2019 5:52 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Stern and Gerlach
- Replies: 3
- Views: 149
Stern and Gerlach
I was having a hard time understanding the electron spin. What does spin up and spin down in terms of the physical atom? What is actually happening?
- Sun Oct 13, 2019 10:25 pm
- Forum: Properties of Light
- Topic: Combining Different Equations
- Replies: 8
- Views: 272
Combining Different Equations
When do we know that it is allowed to combine different equations? In class, we often times intermix E=hv, c=λv, E=pv, etc. Why are we allowed to intermix them and when do we know we need to?
- Sun Oct 13, 2019 10:15 pm
- Forum: Properties of Light
- Topic: Explanation of Balmer and Lyman Series
- Replies: 4
- Views: 231
Explanation of Balmer and Lyman Series
So Professor Lavelle showed a graph in class of the light spectrum which had different lines going through it. He referred to some as the Balmer Series and Lyman Series. I was just confused on what that graph actually was and what the lines explained.
- Sun Oct 13, 2019 10:09 pm
- Forum: DeBroglie Equation
- Topic: Wavelength
- Replies: 6
- Views: 240
Re: Wavelength
In terms of quantifying a wavelength as "measurable" or not, Professor Lavelle stated that anything with a wavelength of 10^-15 or higher should be considered while preforming calculations.
- Sun Oct 13, 2019 9:58 pm
- Forum: Einstein Equation
- Topic: E=hv
- Replies: 5
- Views: 220
Re: E=hv
The equation spelled out is "energy = planck's constant x wavelenght", and since you want to find energy, this equation would be perfect, that is, if you are using it in the correct context.
- Sun Oct 13, 2019 9:54 pm
- Forum: Photoelectric Effect
- Topic: Intensity vs. Length of Waves
- Replies: 4
- Views: 227
Re: Intensity vs. Length of Waves
Higher intensity implies larger amplitude/larger "bumps", whereas shorter wavelength implies closer "bumps".
- Thu Oct 03, 2019 4:36 pm
- Forum: Limiting Reactant Calculations
- Topic: Homework Week 1
- Replies: 18
- Views: 753
Re: Homework Week 1
It's ultimately up to you to chose which 5 you want to complete, however, diversifying your homework questions and choosing one from each section is a good way to practice the different Fundamentals.
- Thu Oct 03, 2019 4:29 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Figs: follow the book or follow Sig Fig rules?
- Replies: 3
- Views: 184
Sig Figs: follow the book or follow Sig Fig rules?
While doing some of the homework, I noticed that the Solution Manual didn't follow the rules of Significant Figures and almost always used two decimal places for all the answers. I was just wondering if we needed to abide by the Solution Manual's numerical values or by the scientific Significant Fig...
- Thu Oct 03, 2019 4:23 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Fundamentals E1
- Replies: 4
- Views: 239
Re: Fundamentals E1
You were correct in converting the moles into atoms. However, the next step is to convert the atoms into pm. Since it is stated in the question that the atoms are 144pm in radius, you know that they are 288pm in diameter (and it's easier to work with when it's in diameters). Since 1 atom of Ag is 28...
- Wed Oct 02, 2019 11:37 pm
- Forum: Limiting Reactant Calculations
- Topic: Why does the Limiting Reactant only affect the other reactant and not affect the product? [ENDORSED]
- Replies: 4
- Views: 259
Why does the Limiting Reactant only affect the other reactant and not affect the product? [ENDORSED]
In the example problem given in class, is was discovered that the CaC2 limited the H2O. However, since the CaC2 is the limiting reactant and not allowing the water to reach its full potential, how come the products produced are not limited as well? If we have less of the CaC2, shouldn't both the oth...
- Wed Oct 02, 2019 11:23 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Formula Units
- Replies: 6
- Views: 364
Re: Formula Units
What is a formula unit in terms of physical things? Is it just a general name for a general unit? Or does it represent something tangible? I know what an atom, molecule, and ion is, however I do not think I can conceptually wrap my head around what an actual formula unit is or what quantity it exact...