Search found 131 matches
- Wed Mar 03, 2021 9:55 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: First - Order/Order
- Replies: 10
- Views: 508
Re: First - Order/Order
I think the order is the amount of reactants it depends on. It is the exponent in the equation
- Sun Feb 28, 2021 10:39 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Textbook 6M.7
- Replies: 4
- Views: 368
Re: Textbook 6M.7
Looking up the values in Appendix 2B was what I did. Essentially, you'd look for the values corresponding to the half reactions where the metal in its ionic state reduces back to its neutral state. But there are multiple where there is a plus3 state and then a plus2 state so which one do I use beca...
- Sat Feb 27, 2021 5:29 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Textbook 6M.7
- Replies: 4
- Views: 368
Textbook 6M.7
Arrange the following metals in order of increasing strength as reducing agents for species in aqueous solution: (a) Cu, Zn, Cr, Fe; (b) Li, Na, K, Mg; (c) U, V, Ti, Al; (d) Ni, Sn, Au, Ag. Where am I supposed to look up the standard reduction potentials? When I look them up in appendix 2B, there ar...
- Wed Feb 24, 2021 10:56 pm
- Forum: Student Social/Study Group
- Topic: Fave movie/show
- Replies: 67
- Views: 4419
Re: Fave movie/show
I really like Prison break on Hulu!
- Wed Feb 24, 2021 2:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem community points
- Replies: 15
- Views: 627
Re: Chem community points
I think it depends on how your TA will be counting your points. Some TAs will just count them at the end and others will count them each week. I would just do it each week to be safe.
- Wed Feb 24, 2021 2:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 48
- Views: 2636
Re: Final
I would just try doing as many practice problems as you can and attending the step up sessions because they do problems you haven't seen before!
- Wed Feb 24, 2021 2:37 pm
- Forum: Student Social/Study Group
- Topic: Chem 14B Final
- Replies: 86
- Views: 5097
Re: Chem 14B Final
The step up sessions are very helpful and doing the textbook problems and making sure you understand the concepts behind them are vital! if you know how to do all of the homework and sapling problems you should be set!
- Wed Feb 24, 2021 2:35 pm
- Forum: Student Social/Study Group
- Topic: Exercising Our Minds and Bodies
- Replies: 120
- Views: 15429
Re: Exercising Our Minds and Bodies
I usually go on walks with my friends or try and run up and down janss steps at ucla!
- Wed Feb 24, 2021 2:34 pm
- Forum: Student Social/Study Group
- Topic: Work and school
- Replies: 16
- Views: 801
Re: Work and school
I am going to try and start studying for finals early that way I dont need to cram all of my work in and it will be spread out throughout the week!
- Wed Feb 24, 2021 2:33 pm
- Forum: Student Social/Study Group
- Topic: How to Reduce Nervousness before getting results
- Replies: 63
- Views: 4773
Re: How to Reduce Nervousness before getting results
Hi!
I usually just try to remind myself that theres not much I can do about it and that it will end up being okay. Try taking your mind off of it by occupying yourself with other things.
I usually just try to remind myself that theres not much I can do about it and that it will end up being okay. Try taking your mind off of it by occupying yourself with other things.
- Sun Feb 21, 2021 10:54 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Is thermal mugs an example of an isolated system?
- Replies: 38
- Views: 1936
Re: Is thermal mugs an example of an isolated system?
Yes. If it is closed then there is no way for matter or energy to be exchanged with the surroundings
- Sun Feb 21, 2021 10:53 am
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Residual Entropy
- Replies: 8
- Views: 482
Re: Residual Entropy
Yes! residual entropy is that equation.
- Sun Feb 21, 2021 10:51 am
- Forum: Student Social/Study Group
- Topic: Classes for next quarter?
- Replies: 165
- Views: 13285
Re: Classes for next quarter?
I plan on taking ls7a, chem 14c, and hopefully chem 14bl
- Sun Feb 21, 2021 10:50 am
- Forum: Student Social/Study Group
- Topic: Post Midterm 2 De-stressing
- Replies: 92
- Views: 6226
Re: Post Midterm 2 De-stressing
I plan on just relaxing and watching tv! its much needed after this week
- Sun Feb 21, 2021 10:50 am
- Forum: Administrative Questions and Class Announcements
- Topic: struggling
- Replies: 73
- Views: 3508
Re: struggling
The step up sessions really help me out! They do a bunch of practice problems so its a good way to see different types of ways questions could be asked!
- Sun Feb 21, 2021 10:49 am
- Forum: Student Social/Study Group
- Topic: Fave food
- Replies: 266
- Views: 29409
Re: Fave food
my favorite food is sushi, I could have it every day
- Sun Feb 21, 2021 10:48 am
- Forum: Student Social/Study Group
- Topic: Test curve?
- Replies: 40
- Views: 2940
Re: Test curve?
In the past the tests were not curved so I dont believe they will be for this quarter either. I believe it depends on how well people do on the exam
- Thu Feb 11, 2021 1:06 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Balancing for Hess's Law
- Replies: 2
- Views: 240
Balancing for Hess's Law
In the textbook there are a couple of problems that require you to balance the chemical equation while using some form of Hess's law to find the total Entropy. I balanced the equations using whole number coefficients but the textbook shows them using coefficients of 1/2. When you use the different c...
- Thu Feb 11, 2021 1:02 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: ΔG° vs ΔG
- Replies: 20
- Views: 735
Re: ΔG° vs ΔG
I believe that the little circle means that it is in standard conditions and for one mole of substance. That applies to all terms. The same is for the enthalpy and other stuff that we learned about
- Thu Feb 11, 2021 1:01 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Difference between Degeneracy and Entropy
- Replies: 4
- Views: 320
Re: Difference between Degeneracy and Entropy
Degeneracy is the term W which we use in solving for entropy which is S. S=kblnW. W is the amount of possible positions the molecules can have to the power of the number of molecules. Entropy and Degeneracy are 2 different things
- Thu Feb 11, 2021 12:58 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: extensive propoerty?
- Replies: 4
- Views: 226
Re: extensive propoerty?
Yes Gibbs free energy is an extensive property meaning that you need to multiply by the amount or moles of substance you have
- Thu Feb 11, 2021 12:57 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Can heat capacities be negative?
- Replies: 52
- Views: 13564
Re: Can heat capacities be negative?
The negatives will cancel out if the q is negative and you should get a positive value for heat capacity
- Thu Feb 11, 2021 12:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Coverage
- Replies: 6
- Views: 378
Re: Midterm 2 Coverage
I believe the midterm will cover everything from last midterm to this fridays lecture. I am assuming this based off of how he structured last midterm
- Wed Feb 03, 2021 12:41 pm
- Forum: Student Social/Study Group
- Topic: Favorite Music
- Replies: 113
- Views: 9977
Re: Favorite Music
I love the song Holy by Justin Bieber and have been listening to it on repeat every day!
- Wed Feb 03, 2021 12:40 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess Law
- Replies: 7
- Views: 469
- Wed Feb 03, 2021 12:39 pm
- Forum: Student Social/Study Group
- Topic: Spring 2021
- Replies: 106
- Views: 12164
Re: Spring 2021
I think I am going to take 14BL next quarter because I want to have the chemistry fresh in my mind and it doesn't seem too bad online.
- Wed Feb 03, 2021 12:37 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Degeneracy (W)
- Replies: 7
- Views: 240
Re: Degeneracy (W)
I dont think that degeneracy has any units. Degeneracy is just the number of possible states that could exist based on the number of molecules you have. It doesnt have units
- Wed Feb 03, 2021 12:36 pm
- Forum: Calculating Work of Expansion
- Topic: Work Formulas
- Replies: 5
- Views: 140
Re: Work Formulas
I agree with the above statements. You will always have a volume but if there is no change in volume then no work is being done because work=-Pressure external* DeltaVolume so work=0 when no change in volume occurs
- Wed Feb 03, 2021 12:33 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Microstates
- Replies: 16
- Views: 1036
Re: Microstates
DMaya_2G wrote:Degeneracy is connected to microstates by the equation W = X^n. Degeneracy describes all of the possible positions that a particle can exist at.
X would be equal to the number of microstates in this equation. n would be equal to the number of possible states
- Wed Feb 03, 2021 12:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Finishing outline 3
- Replies: 3
- Views: 171
Finishing outline 3
Does anyone know when we are finishing outline 3? There are some topics in outline 3 that relate to work which I know is thermodynamics. As I was reading the textbook there were also a lot of things discussed that we did not talk about in lecture either. When should we be done with outline 3 homewor...
- Thu Jan 28, 2021 2:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Matthew's Workshop - Week 1
- Replies: 7
- Views: 626
Re: Matthew's Workshop - Week 1
Hi I got the same problem as the person above me. Does anyone know if there was a typo on the answer key?
- Wed Jan 27, 2021 11:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Taking the Anti-Log
- Replies: 37
- Views: 2458
Re: Taking the Anti-Log
To take the anti log of something you just to 10^-(whatever it is you are taking the antilog of). Hope this helps!
- Wed Jan 27, 2021 11:32 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium "shifts" to the right
- Replies: 6
- Views: 481
Re: Equilibrium "shifts" to the right
The thing to remember is that the K value is not changing but the Q value would be changing. that is why we say that it will shift to the left or right. Because the Q value changes and then you need to shift the equilibrium in order to return to your K value
- Wed Jan 27, 2021 11:30 pm
- Forum: General Science Questions
- Topic: Careless Mistakes
- Replies: 54
- Views: 3410
Re: Careless Mistakes
I usually do this a lot to and what works for me is doing the problem really slowly and checking after every step that I didnt miss something. Also just going a little slower might help as well.
- Wed Jan 27, 2021 11:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture Content for MT1
- Replies: 4
- Views: 195
Re: Lecture Content for MT1
I think the last lecture that is covered on the Midterm will be last friday's lecture which should be lecture #8
- Wed Jan 27, 2021 11:27 pm
- Forum: Student Social/Study Group
- Topic: Midterm Practice
- Replies: 6
- Views: 351
Re: Midterm Practice
The UA worksheets have a lot of problems and those are really helpful to do as well!
- Wed Jan 27, 2021 11:26 pm
- Forum: Student Social/Study Group
- Topic: Spring 2021
- Replies: 106
- Views: 12164
Re: Spring 2021
I think I am going to take chem 14Bl next quarter.
- Wed Jan 20, 2021 8:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Questions for 4D
- Replies: 1
- Views: 110
Questions for 4D
I know that he sent out an email saying that this week we would be covering 4D.3,4,5 but does anyone know what questions those would pertain to? Because we have a list of questions on the outline for thermochemistry but we dont do all of 4D which is what the questions are assigned for.
- Wed Jan 20, 2021 1:20 pm
- Forum: Student Social/Study Group
- Topic: Calculators
- Replies: 52
- Views: 3069
Calculators
Does anyone know if we are allowed to use a graphing calculator for the midterms and final?
- Wed Jan 20, 2021 1:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka and Kb
- Replies: 3
- Views: 147
Re: Ka and Kb
pkb and Kb correspond to the amount of OH- is released/ made. if you have a higher Kb it means that more product is formed therefore more OH- is formed so it would make it more basic. You need to think of Ka and Kb as equilibrium concentrations of H30+ and OH- respectively.
- Wed Jan 20, 2021 12:49 pm
- Forum: Phase Changes & Related Calculations
- Topic: Lecture #7 Question
- Replies: 7
- Views: 173
Re: Lecture #7 Question
Yes you are right. Steam burns more because there is a larger change in energy which means it releases more heat therefore it burns more. Because it has a larger phase change energy gap
- Wed Jan 20, 2021 12:47 pm
- Forum: Phase Changes & Related Calculations
- Topic: state functions
- Replies: 13
- Views: 1327
Re: state functions
State functions are things that do not depend on the path that they take. You just need to know the beginning and ending numbers. For example change in temperature, density, and volume. Work is not a state function because in order to calculate work you need to know the direct path it took and all o...
- Wed Jan 20, 2021 12:44 pm
- Forum: Phase Changes & Related Calculations
- Topic: Vapor vs gas
- Replies: 121
- Views: 9101
Re: Vapor vs gas
They are the same thing just a different way of saying them. They are both the same phase
- Wed Jan 20, 2021 12:43 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: amphoteric vs amphiprotic
- Replies: 10
- Views: 282
Re: amphoteric vs amphiprotic
I think something that is amphiprotic is amphoteric but there are things that can act as an acid and base which would be amphoteric but it would not donate a proton or accept a proton
- Wed Jan 20, 2021 12:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: Steam causing severe burns
- Replies: 5
- Views: 175
Re: Steam causing severe burns
I think your analysis is correct because the hydrogen bonds are the reasons for the larger heat of vaporization. But the steam of another substance will still cause more severe burns than a liquid of that same substance
- Tue Jan 12, 2021 3:10 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Getting two positive x values when using quadratic
- Replies: 43
- Views: 4625
Re: Getting two positive x values when using quadratic
If you get two positive values it is likely that one of the values was larger than the initial concentration you are given therefore you would omit that one because you cannot end up with a negative concentration.
- Tue Jan 12, 2021 3:09 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction Quotient
- Replies: 10
- Views: 956
Re: Reaction Quotient
K is the value when the concentrations have reached equilibrium while Q is a form of the equilibrium constant expect the reaction has not yet reached equilibrium.
- Tue Jan 12, 2021 3:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc and Kp
- Replies: 5
- Views: 140
Re: Kc and Kp
I dont think it makes a difference it would just be easier to do kp if you are given partial pressures. But you must make sure that all of your units are the same so if you got partial pressure and molar concentrations you should convert one of them to be the same as the other and then calculate K
- Tue Jan 12, 2021 3:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kw= 1.0 x 10^-14
- Replies: 11
- Views: 1553
Re: Kw= 1.0 x 10^-14
I am pretty sure that it is just a constant we are supposed to memorize that was determined experimentally.
- Tue Jan 12, 2021 3:03 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 9
- Views: 543
Re: Le Chatelier's Principle
https://www.khanacademy.org/science/ap- ... -principle
I found this video really helpful
I found this video really helpful
- Tue Jan 12, 2021 3:01 pm
- Forum: Student Social/Study Group
- Topic: New Year Resolutions?
- Replies: 54
- Views: 2554
Re: New Year Resolutions?
My resolution is to get more on top of my work and not procrastinate as much
- Tue Jan 12, 2021 2:59 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Textbook 6B.9 question
- Replies: 4
- Views: 195
Textbook 6B.9 question
I wasnt sure where to put this question because there is no forum for acid and base equilibrium but one of the textbook questions asks for the ph and gives us the [H3O+]=1.5mol/L so I took the negative log of 1.5 and got -.176 but the answer key says it is .176. Can anyone explain why
- Wed Jan 06, 2021 8:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium Constant
- Replies: 8
- Views: 561
Re: Equilibrium Constant
Yes it means that the equilibrium lies more to the right. If K is larger than 1 then it lies more to the right and favors the products
- Wed Jan 06, 2021 8:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Homework
- Replies: 6
- Views: 276
Re: Sapling Homework
Yes you are right the only things we submit are the sapling questions but there will be more in the upcoming weeks I believe he only posted the first one so far. Textbook problems are also assigned as homework but they do not need to be turned in for a grade
- Wed Jan 06, 2021 8:23 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q and K trend/similarity
- Replies: 8
- Views: 308
Re: Q and K trend/similarity
Im not sure if the reasoning behind them are the same but Yes it does seem like they follow the same trends
- Wed Jan 06, 2021 8:13 pm
- Forum: Ideal Gases
- Topic: PV=nRT question
- Replies: 6
- Views: 274
Re: PV=nRT question
I think it depends on the question but if you have one of the gases in partial pressure and the others in concentration you will need to convert them all to the same type either concentration or pressure.
- Wed Jan 06, 2021 8:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Stability of reactants vs products
- Replies: 5
- Views: 534
Stability of reactants vs products
Does anyone know how to determine the stability of the reactants vs products based on the kc values? and what does it mean
- Wed Jan 06, 2021 8:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Ending Chemical Equilibrium
- Replies: 1
- Views: 86
Ending Chemical Equilibrium
Does anyone know when we will be done learning about chemical equilibrium and moving onto the next section?
- Sat Dec 12, 2020 10:19 am
- Forum: Calculating the pH of Salt Solutions
- Topic: Nuetralization example
- Replies: 2
- Views: 218
Nuetralization example
is HCl+ NH3 = NH4Cl a neutralization reaction? no because it is not making salt and water? This is still an acid-base reaction right?
- Sat Dec 12, 2020 10:16 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Solubility of Ionic bonds
- Replies: 3
- Views: 332
Solubility of Ionic bonds
Can someone explain why ionic bonds are soluble in water? Is it because the bonds are weaker because the electrons are being pulled to one side so it makes the bond weaker and easier to break apart in water?
- Sat Dec 12, 2020 10:14 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: shape
- Replies: 6
- Views: 423
Re: shape
The people above said it best but yes we do not need to know which one of the two it would be but I am pretty sure we should know that the heme complex ligand is square planar and that the three most common shapes are tetrahedral square planar and octahedral.
- Sat Dec 12, 2020 10:13 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: (CO3) 2-
- Replies: 5
- Views: 401
Re: (CO3) 2-
I was confused about this too but I went to a TA and they said that trigonal planar species can be either monodentate or bidentate. I was confused because in class dr. Lavelle did an example of a trigonal planar and said that the other atoms were too far away to bond. Can anyone explain this.
- Sat Dec 12, 2020 10:11 am
- Forum: Naming
- Topic: oxidation number
- Replies: 9
- Views: 539
Re: oxidation number
You would have to look at the charge of each of the ligands. Then once you figure that out you look at how many there are and then if there is a net charge on the compound you must use the charge of the ligands to figure out what the charge of the metal should be in order to equal that net charge. I...
- Mon Dec 07, 2020 7:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: CO32- why is it polydentate
- Replies: 1
- Views: 70
CO32- why is it polydentate
Why would CO32- ion be polydentate. On the lewis structure there are two oxygens which have a lone pair but wouldn't the shape being trigonal planar prohibit it from binding to the same cation? I thought that the oxygens would be too far away from one another to bind to the same cation.
- Tue Dec 01, 2020 9:24 pm
- Forum: Student Social/Study Group
- Topic: Molecule Modeling tool
- Replies: 4
- Views: 207
Re: Molecule Modeling tool
This was really helpful thank you! Its so much easier to do the questions when we can actually visualize the shapes!
- Tue Dec 01, 2020 9:23 pm
- Forum: Student Social/Study Group
- Topic: Happy Thanksgiving!
- Replies: 39
- Views: 1794
Re: Happy Thanksgiving!
I hope everyone had a meaningful and restful Thanksgiving break! I know it was much needed after our midterm!
- Tue Dec 01, 2020 9:21 pm
- Forum: Student Social/Study Group
- Topic: Final Format
- Replies: 35
- Views: 1570
Re: Final Format
Does anyone know if we will be taking it in breakout rooms like we did for our midterm? How are we planning on zooming and using respondus?
- Tue Dec 01, 2020 9:16 pm
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 29
- Views: 2635
Re: Sigma and Pi bonds
An easy way to remember is that sigma bonds are always single bonds and then pi bonds are when there are double or triple or more bonds. In that case, one of the bonds in the double or triple will be sigma and the other two will be pi bonds
- Tue Dec 01, 2020 9:15 pm
- Forum: Naming
- Topic: Lecture Example [Co(Nh3)5 Cl]Cl2H2O
- Replies: 8
- Views: 341
Re: Lecture Example [Co(Nh3)5 Cl]Cl2H2O
I think it is named differently because that is not part of the coordination compound. The things outside of the brackets are treated and names as they normally would be if you saw them alone.
- Tue Dec 01, 2020 9:13 pm
- Forum: Student Social/Study Group
- Topic: Final Exam Study Tips
- Replies: 48
- Views: 2364
Re: Final Exam Study Tips
Does anyone know when they will start studying? I am nervous that its going to be hard studying the old material while still learning new things.
- Mon Nov 30, 2020 3:21 pm
- Forum: Naming
- Topic: Naming This compound
- Replies: 3
- Views: 204
Naming This compound
Can someone explain why the answer to naming this compound:
[Co(NH3)3(OH2)3]2 (SO4)3
would be triamminetriaquacobalt(III) sulfate and not bistriamminetriaquacobalt(III) trisulfate
[Co(NH3)3(OH2)3]2 (SO4)3
would be triamminetriaquacobalt(III) sulfate and not bistriamminetriaquacobalt(III) trisulfate
- Sat Nov 28, 2020 11:09 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sapling #3
- Replies: 5
- Views: 217
Re: Sapling #3
Could someone explain what I did wrong? I know that there are three regions of electron density and one lone pair. Wouldn't the smallest bond angle between the two sets of bonded electrons be less than 109.5? Since there are three regions of electron density the electron density shape would be trig...
- Sat Nov 28, 2020 11:05 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Textbook 2E.11b
- Replies: 1
- Views: 63
Textbook 2E.11b
Use Lewis structures and the VSEPR model to give the VSEPR formula for each of the following species and predict its shape: b) iodine trichloride Can anyone explain why the lewis structure is the way it is? I thought there had to be 32 valence electrons but when I look at the answer key and count al...
- Sat Nov 28, 2020 10:50 am
- Forum: Lewis Structures
- Topic: SnCl2 lewis structure
- Replies: 2
- Views: 605
SnCl2 lewis structure
Can anyone explain how you would get the lewis structure of SnCl2? I cant seem to get it right.
- Sat Nov 28, 2020 10:47 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Textbook 2.45 Question
- Replies: 1
- Views: 254
Textbook 2.45 Question
Consider the bonding in H2C═CHCHO. (a) Draw the most important Lewis structure. Include all nonzero formal charges. (b) Identify the composition of the bonds and the hybridization of each lone pair—for example, by writing σ (H1s,C2sp2). Can anyone explain how you are supposed to determine the hybrid...
- Sat Nov 28, 2020 10:44 am
- Forum: Hybridization
- Topic: Textbook 2F.15 Question
- Replies: 2
- Views: 174
Textbook 2F.15 Question
Noting that the bond angle of an sp3 hybridized atom is 109.5° and that of an sp2 hybridized atom is 120°, do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased?
Can anyone explain why the answer would be increasing?
Can anyone explain why the answer would be increasing?
- Sat Nov 28, 2020 10:34 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular shape of ClF3
- Replies: 4
- Views: 236
Molecular shape of ClF3
for ClF3 why do you make the 2 lone pairs from the equatorial axis and not from the axial. Since there are 5 regions of electron density. Wouldnt making the two atoms on the axial axis the lone pairs cancel the dipoles out?
- Fri Nov 20, 2020 10:26 am
- Forum: Octet Exceptions
- Topic: Octet Rule Exceptions
- Replies: 20
- Views: 1328
Re: Octet Rule Exceptions
I believe that B and Al dont need an octet as well.
- Fri Nov 20, 2020 10:24 am
- Forum: Student Social/Study Group
- Topic: grade worries
- Replies: 119
- Views: 14913
Re: grade worries
Yes! I have been thinking about this too. I am always worried about grades but hopefully the grades for this midterm will come out quicker. I hate waiting lol
- Fri Nov 20, 2020 10:22 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: LDF forces
- Replies: 9
- Views: 410
Re: LDF forces
Yes. You should remember that all molecules will have LDF forces. But the bigger the molecule the more LDF forces it will have making the forces stronger.
- Fri Nov 20, 2020 10:21 am
- Forum: Student Social/Study Group
- Topic: post midterm 2
- Replies: 27
- Views: 1097
Re: post midterm 2
I had mine on Wednesday and I thought it went pretty well. There were only a couple questions that I had to think about for a little while before knowing what to do but after applying what we learned I think I did it correctly.
- Fri Nov 20, 2020 10:20 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration for Silver?
- Replies: 8
- Views: 868
Re: Electron Configuration for Silver?
Silver is an exception. You just have to remember that because it can fill up the shell it would want to do that because it will make the molecule more stable. So instead of filling up the s subshell it will fill up the d subshell and then leave one empty in the s subshell.
- Fri Nov 20, 2020 10:19 am
- Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Topic: Boiling and Melting point
- Replies: 24
- Views: 2847
Re: Boiling and Melting point
Yes Molecules that have a higher melting or boiling point means that they have stronger intermolecular forces. If a molecule has hydrogen bonding it will very likely have the highest boiling point because it has very strong intermolecular forces. That is why waters boiling point is so high
- Mon Nov 16, 2020 8:41 pm
- Forum: Bond Lengths & Energies
- Topic: Solubility in water
- Replies: 1
- Views: 160
Solubility in water
Can someone explain why AgF is more soluble in water than AgI? I understand the fact that polarizability plays a role in this and that since I is larger it is more polarizable so AgI has more covalent character. But arent covalent bonds weaker than Ionic bonds so wouldnt have more covalent character...
- Sun Nov 15, 2020 10:49 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electrostatic Potential Energy
- Replies: 3
- Views: 191
Electrostatic Potential Energy
Can anyone explain what electrostatic potential energy is? I know he explains it in one of his lectures but I am still confused on what it represents. Does it represent the energy of the electron?
- Sat Nov 14, 2020 9:33 am
- Forum: Dipole Moments
- Topic: Finding a dipole moment
- Replies: 6
- Views: 448
Finding a dipole moment
How do you see if there is a dipole moment in a molecule? What are you supposed to look at? And does knowing if a molecule has a dipole moment show you if it is polar or non polar?
- Sat Nov 14, 2020 9:32 am
- Forum: Lewis Structures
- Topic: NH2OH Polar or non polar
- Replies: 2
- Views: 285
NH2OH Polar or non polar
How can you tell if NH2OH is polar or non polar? Is it because there is a dipole moment and it is arranged asymmetrically? Can someone explain how you have to determine if a molecule is polar or non polar
- Fri Nov 13, 2020 2:19 pm
- Forum: Lewis Structures
- Topic: Lewis structure of BeCl2
- Replies: 2
- Views: 84
Lewis structure of BeCl2
How come in class today in the lewis structure of BeCl2 Be did not have an octet? I thought that all atoms have to have an octet. And how come this is not an ionic compound because isnt it a bond between a metal and a nonmetal? Do we draw lewis structures for ionic compounds too?
- Thu Nov 12, 2020 5:12 pm
- Forum: Octet Exceptions
- Topic: Textbook 2C.3 question
- Replies: 3
- Views: 258
Textbook 2C.3 question
Draw the Lewis structure, including typical contributions to the resonance structure (where appropriate, allow for the possibility of octet expansion, including double bonds in different positions), for (a) periodate ion; (b) hydrogen phosphate ion; (c) chloric acid; (d) arsenate ion. Can anyone exp...
- Thu Nov 12, 2020 11:11 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Hydrogen bonding why it works?
- Replies: 4
- Views: 261
Hydrogen bonding why it works?
How does a hydrogen bond work because wouldnt that mean that the hydrogen then has 4 electrons on it and doesnt Hydrogen always only have one bond? We said that hydrogens are the exception to the octet rule. So how come it can have more than 2 bonds?
- Thu Nov 12, 2020 10:26 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Liquid or Solid molecules
- Replies: 1
- Views: 99
Liquid or Solid molecules
How do we know that Br2 is a liquid and I2 is a solid. I know he explained in class that since I2 has more electrons and is more polarizable it is a solid but why does that make sense. Since solids are not easily distorted in real life, I thought the molecules are really stuff and do not move around...
- Mon Nov 09, 2020 2:45 pm
- Forum: Dipole Moments
- Topic: Dipole confusion
- Replies: 3
- Views: 123
Dipole confusion
Can anyone explain what a dipole is? What would be considered a dipole?
- Fri Nov 06, 2020 10:00 am
- Forum: Octet Exceptions
- Topic: Exceptions
- Replies: 9
- Views: 354
Exceptions
Do we just need to memorize which atoms are exceptions or is there a way to tell? Also what are all of the exceptions we should have memorized.
- Fri Nov 06, 2020 9:58 am
- Forum: Student Social/Study Group
- Topic: How many points for an A and above?
- Replies: 10
- Views: 319
Re: How many points for an A and above?
Does anyone know if this class uses a point system or a percentage system to calculate our grades?
- Fri Nov 06, 2020 9:57 am
- Forum: Resonance Structures
- Topic: Faster way to do resonance structures?
- Replies: 3
- Views: 273
Faster way to do resonance structures?
I was wondering if there was a faster way to do resonance structures. Maybe through a formula or maybe by looking at the numbers of each atom.
- Fri Nov 06, 2020 9:55 am
- Forum: Electronegativity
- Topic: Confusion between electronegativity and electron affinity
- Replies: 15
- Views: 767
Confusion between electronegativity and electron affinity
Are electronegativity and electron affinity basically the same thing? From what I have been reading on the two they seem very similar and I am having trouble understanding the difference between them
- Fri Nov 06, 2020 9:53 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3055795
Re: Post All Chemistry Jokes Here
Just came across this really funny chemistry joke!
Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.
Thought I would share it
Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.
Thought I would share it
- Fri Nov 06, 2020 9:52 am
- Forum: Student Social/Study Group
- Topic: Favorite TV shows
- Replies: 277
- Views: 34583
Re: Favorite TV shows
You should definitely watch Love island (UK). It is one of my all time favorite shows. It is so funny and entertaining and their accents make it even better.
- Fri Nov 06, 2020 9:50 am
- Forum: Ionic & Covalent Bonds
- Topic: Textbook 2B.13 question
- Replies: 3
- Views: 184
Textbook 2B.13 question
Anthracene has the formula C14H10. It is similar to benzene but has three six-membered rings that share common C—C bonds, as shown below. Complete the structure by drawing in multiple bonds to satisfy the octet rule at each carbon atom. Resonance structures are possible. Draw as many as you can find...
- Fri Nov 06, 2020 9:48 am
- Forum: Ionic & Covalent Bonds
- Topic: Atomic Radius
- Replies: 38
- Views: 2987
Atomic Radius
Can someone explain why the atomic radius decreases as you move across a period? If there are more electrons shouldnt electron-electron repulsion push them farther away, making the radius larger?