4448 R2 Exam 2 Review 2024
46:18
3 ай бұрын
4448 L07-R1 Exam 1 Review 2024
47:55
Пікірлер
@YasminMabed
@YasminMabed 9 күн бұрын
hydrogen peroxide is a C2 molecule ?!
@dw-pchem
@dw-pchem 9 күн бұрын
Yes, good job. You are right. But we are using the C2h structure for educational purposes. It is more interesting.
@camillesalloum3701
@camillesalloum3701 10 күн бұрын
how to have this excel file?
@java3108
@java3108 22 күн бұрын
Great video, thank you Dr. Williams!
@CabbageSandwich
@CabbageSandwich Ай бұрын
Thank you, so so much
@FLANG3265
@FLANG3265 Ай бұрын
Except the Earth isn't a greenhouse with glass panels. Poor comparison. Also totally disregarding atmospheric pressure that causes heat that is easily demonstrated with adiabatic rate of temperature and temperature difference between liw and high pressure systems.
@GoutamDAS-ls1wb
@GoutamDAS-ls1wb 2 ай бұрын
I guess one would need to impose a strong magnetic field to see the hyperfine splitting?
@dw-pchem
@dw-pchem 2 ай бұрын
Yes. But some of these splittings can be resolved in high-resolution experiments because of the electron's magnetic moment causing an energetic split.
@GoutamDAS-ls1wb
@GoutamDAS-ls1wb 2 ай бұрын
Professor Williams--very helpful presentation. How does one estimate lifetimes of metastable states? And how does one go about designing a new laser? I guess one needs to have a very accurate map of the possible energy levels of the species involved???
@dw-pchem
@dw-pchem 2 ай бұрын
To measure the lifetimes of these energy states, one would use a flashlamp and a "time-gated" detector with a very narrow time window for detecting the fluorescence from the level of interest. These experiments are very interesting and fun! I no longer have the equipment to do them, but I did in my graduate studies at Oregon State U with Dr. Joe Nibler.
@chasemontoya1239
@chasemontoya1239 2 ай бұрын
I found this very informative for someone like me, who has no idea what any of this means. I wanted to learn about Quantum Mechanics and my sister sent me your videos. Thanks 👍🏼
@dw-pchem
@dw-pchem 2 ай бұрын
I love this comment! I am so glad that my video was informative to someone who is new to the topic.
@Khushnuma0645
@Khushnuma0645 2 ай бұрын
I think it'll be easy to understand if u write it simply in the form of (sigma 1s^2 sigma *1s^2....pi2px^2=pi2py^2...) btw thanks for your efforts
@dw-pchem
@dw-pchem 2 ай бұрын
I don't use those electron configuration designations because they only apply to diatomics.
@RJ-zc7vs
@RJ-zc7vs 2 ай бұрын
I fell a sleep and this is what i woke up to
@AdamVečeřa-v7c
@AdamVečeřa-v7c 2 ай бұрын
Educate yourself while youre here
@YTantirungrotechai
@YTantirungrotechai 3 ай бұрын
Thank you for sharing your lectures. They're awesome!
@adamhanninen8295
@adamhanninen8295 3 ай бұрын
Hey Prof another great video thanks! Do you have a video or can I make a request for a discussion on vibronic coupling between some common fluorophores and the relative position of an added nitrile, alkyne, or other group in the cell “silent region”? E.g., look at the structure of FITC, if you excite the ITC vibration (IR or Raman), will it couple to an electronic transition if you have a suitable visible excitation source? Or does it have to be much closer to the conjugated electrons like the nitrile in rhodamine 800? Thanks!
@dw-pchem
@dw-pchem 3 ай бұрын
It is beyond the scope of this undergraduate course. I'd love to take a stab at the question, but I'd need to study the systems in more depth. My videos do not address the situations of Resonance Raman or other phenomena (Fermi Resonances) that can occur. These can dramatically affect the intensities of transitions. Although I do not know the system you are interested in, I'm sure from theory, there are more wave functions added into the transition dipole moment integral (for FTIR interactions) or the scattering/polarizability transition moment integral (Raman) changing the intensity of the interactions. Not sure I addressed your interest, but that's all I've got off the top of my head. Have a blessed day!
@enjoychemistry
@enjoychemistry 3 ай бұрын
Thank you very much sir
@enjoychemistry
@enjoychemistry 3 ай бұрын
Sir hats off your presentation it is really amazing Sir is it possible to share the background for the physical equations that you presented
@dw-pchem
@dw-pchem 3 ай бұрын
I have put all of this together in a book called Spectroscopy Theory in One Dimension. But the source of these equations started with Schodinger in his paper developing wave mechanics. I explain the history of it in the History of Quantum Thinking video. kzbin.info/aero/PL9uODa3SAZN-_gQhqY2eaGzbal2bTE_iW&si=8tTFFnKLvJcOXoHn
@NerdyG-v1g
@NerdyG-v1g 4 ай бұрын
Its [CrH6]3- ? Great video! Thanks and greeting from Germany :)
@dw-pchem
@dw-pchem 3 ай бұрын
Thank you from Texas! :D
@abscichemclasses
@abscichemclasses 5 ай бұрын
Thank you so much sir for this cource Sir, which book you will prefer for symmetry and spectroscopy Please recommend
@dw-pchem
@dw-pchem 5 ай бұрын
Here is my book, which is a very easy read in my opinion. It shows all the maths. pubs.aip.org/books/monograph/94/Spectroscopy-Theory-in-One-Dimension
@tigerbitegirl06
@tigerbitegirl06 6 ай бұрын
Great video. thanks!
@kaushalacademy7192
@kaushalacademy7192 7 ай бұрын
Very nice 👌🏻
@谷歌孙-s4i
@谷歌孙-s4i 7 ай бұрын
Thanks, I learnt a lot from your online lessons. Could u please give some lectures about the relation between lattices vibration and raman spectroscopy or even the associate with band structures of crystal. That could be more interesting.
@DamithDharmapriyaSriHasthaLeka
@DamithDharmapriyaSriHasthaLeka 9 ай бұрын
Great video!
@likeli-cl8bj
@likeli-cl8bj 9 ай бұрын
Can you tell me where I can get the raw figure of the 3D phase diagram?
@elialiaga6463
@elialiaga6463 9 ай бұрын
Hey Darren, awesome video! I was wondering if you still have the excel spreadsheet available to play around with. The link in the comment section leads to a page not found. Thanks in advance.
@pqcw
@pqcw 9 ай бұрын
Thanks for asking!! I'm so glad you appreciated the video and this topic.
@dw-pchem
@dw-pchem 9 ай бұрын
New link to the Excel Sheet: profiles.shsu.edu/chm_dlw/share/QSPR-TrainingSet.xlsx
@mcagostini1215
@mcagostini1215 10 ай бұрын
I love this memory trick to remember the cathode and anode!! This would have helped me and I'll be using this with my students now. thank you!!:)
@susanstjohn6602
@susanstjohn6602 10 ай бұрын
I am a 77 year old US citizen (New York) and ex-teacher having taught 25 years of Chemistry in Australia. I am doing a lot of Physics and Maths, now Physical Chemistry at University of Technology (Sydney). I am trying to update all my Chemistry and Physics. Your Physical Chemisttrry lectures are outstanding!. I am so impressed with the level of care you take to make Quantam mechanics understandable. I have just done our first HCl spectroscopy and thermodynamic lab. Some of your lectures I watched until wee hours in the morning because they were so interesting. I am getting closer to understanding the Schrodinger equation. I always started my semester'slesson by telling my students that they were more intelligent than me. That I did not know everything. I had a wonderful teaching career because I worked with that principle. I hope to be able to do some research before I die. Maybe even drop dead at the University. Your lectures have inspired me to keep going and to be part of the learning with the very much younger students I share each lesson. The young people inspire me and make me want to keep learning with you and them. I am looking forward to the book and wish you would put up the names of title you have been part of so far so I can try to get them here.
@mohammedal-ageel3050
@mohammedal-ageel3050 10 ай бұрын
For the case of reflection of H2O molecule, how comes the hydrogen atoms got moved in zx plane and did not in zy plane? what determines the movemen?
@darren.williams
@darren.williams 10 ай бұрын
The zy reflection acts on the hydrogens and the oxygens by reflecting the front-facing hemispheres into the back-facing hemispheres and vice versa. The locations of the atoms do not move because their x-coordinates are all zero. I hope this makes sense. The front of the planar molecule is exchanged with the back of the molecule, but one cannot see this happen. If you could see the Px orbital on oxygen, you would see that the shaded and unshaded regions would swap.
@zachariahkovac2048
@zachariahkovac2048 10 ай бұрын
This sounds amazing! Is there any update?
@dw-pchem
@dw-pchem 10 ай бұрын
Here is the web page for the book at AIP Press: pubs.aip.org/books/monograph/94/Spectroscopy-Theory-in-One-Dimension
@Saranmathiyalagan
@Saranmathiyalagan 11 ай бұрын
Hi sir suggest me some organic chemistry books 📚
@dw-pchem
@dw-pchem 11 ай бұрын
I do not have any recommendations for organic chemistry books. I am a Physical Chemist.
@Saranmathiyalagan
@Saranmathiyalagan 11 ай бұрын
@@dw-pchem ok sir gracious ❤️ I am studying bsc chemistry 2nd year I have intrest to study organic chemistry in MSC at SRM University,India
@Olympiadmaxx
@Olympiadmaxx 3 ай бұрын
@@SaranmathiyalaganAnna is bsc chem a good course. What is the scope of chemistry?
@Saranmathiyalagan
@Saranmathiyalagan 3 ай бұрын
@@Olympiadmaxx industry related jobs neraya iruku pa , lab assistant, research and professer
@Olympiadmaxx
@Olympiadmaxx 3 ай бұрын
@@Saranmathiyalagan Are you working now Anna? Sorry ungala doubts Ketu disturb panrathuku
@uditasingh6240
@uditasingh6240 11 ай бұрын
I had a lot of trouble in this. Thankyou for your explanation. Lots of love from India.
@dw-pchem
@dw-pchem 11 ай бұрын
Lots of love from me to my viewers in India! I made this channel for my students to review for exams and it has received a LOT of views from India. I am thrilled by that!!
@uditasingh6240
@uditasingh6240 11 ай бұрын
@@dw-pchem Your students are very fortunate to have you as their professor, Sir.
@hootahooota594
@hootahooota594 Жыл бұрын
Sir, Advanced in organuc chemistry is it 6th edition? And colored?
@saidurmursalinrafter9673
@saidurmursalinrafter9673 Жыл бұрын
Thanks for the video sir.
@anasforum7101
@anasforum7101 Жыл бұрын
your tutorials always magnificent, thank you very much.
@thusharikamuthumali
@thusharikamuthumali Жыл бұрын
I was sitting in your class when you were filming these videos. After four years I am watching them again to refresh my memory. Thank you very much for uploading these.
@dw-pchem
@dw-pchem Жыл бұрын
Great to hear from you Thusharika!
@albertopellegrino1695
@albertopellegrino1695 Жыл бұрын
I have no idea why no-one elogy about this beautiful lesson. I'm new in spectroscopy and your lecture are so interesting and brilliant in my advice. Thank you for sharing your lecture and making it free and accessible to students.
@dw-pchem
@dw-pchem Жыл бұрын
Thank you for the encouraging comment @albertopellegrino1695 !!
@Flash_345
@Flash_345 Жыл бұрын
Lmao you're the first person who I've ever heard talk about the video game superhot. Great game.
@rajanalexander4949
@rajanalexander4949 Жыл бұрын
This lecture is jaw droppingly engaging and lucid!
@rajanalexander4949
@rajanalexander4949 Жыл бұрын
Prof DW provides such simple, sharp, clear explanations, and as a bonus some funny anecdotes for levity (and oft-overlooked history). Thank you for your masterful teaching, and especially sharing these lectures. I'm looking forward to watching the whole lot!
@user-kai516
@user-kai516 Жыл бұрын
Hi, can I draw the charge density difference through Gaussian too? Thank you.
@maxmuster7003
@maxmuster7003 Жыл бұрын
I like to use these pipe operators > >> < with a batch file to redirect the output of echo commands into a new text file and to redirect the text file to DOS Debug to create a new 16 bit executable for DOS from the output and the output contains internal Debug commands and a routine made with x86 assembly mnemonics.
@rockwellthivierge9193
@rockwellthivierge9193 Жыл бұрын
💐 Promo-SM
@noureddinebenharkat2476
@noureddinebenharkat2476 Жыл бұрын
Professor, Can I conact you, please?
@MidnightStorm4990
@MidnightStorm4990 Жыл бұрын
Remember when chemistry was about bonds 😂
@canopus8160
@canopus8160 Жыл бұрын
How can i determine Ra mathimatically please ?
@Coco-so1dh
@Coco-so1dh Жыл бұрын
Is it possible to predict "good" solvents that weren't tested experimentally using Excel and POV-ray?
@dw-pchem
@dw-pchem Жыл бұрын
Closer is better, so if your solvent or blend is within 1 Mpa (or kJ/L), it will likely be a "good" solvent, meaning it will dissolve, swell, or otherwise interact strongly with the substance you are targeting.
@aymennabeelyaseen7638
@aymennabeelyaseen7638 Жыл бұрын
Huge amount of thanks
@encrypted1755
@encrypted1755 Жыл бұрын
Hello, sir. I have a question. Is it possible to enroll in a master's program in chemistry, provided that I study the bachelor's course on my own. And based on this, when reading various chemistry textbooks, is it necessary to watch lectures at the same time, focused on specific textbooks and topics?
@dw-pchem
@dw-pchem Жыл бұрын
Admission to graduate school (here and elsewhere) is competitive so it is very unlikely that you would be admitted without the full bachelors degree in chemistry.
@douglasstrother6584
@douglasstrother6584 Жыл бұрын
I kept nearly all of my Physics and Math texts from Undergrad and Grad School. I let go a number of books titled such as "Graduate Problems in Physics" since they were geared towards exam prep. I regret letting go of my "Modern Quantum Mechanics" by J. J. Sakurai.
@bradrowland7687
@bradrowland7687 Жыл бұрын
Hello fellow Physical Chemist. Thanks for the video and approach. We adapted this video to make thermodynamic cycle experiments for both the Stirling engine and Otto cycle. The new experiments are for engineers.
@dw-pchem
@dw-pchem Жыл бұрын
That's great! I'm so glad you found this video. I love the Stirling engine, and think it has some use when coupled with dirty/corrosive fuels or even solar heating.
@benjaminsit3899
@benjaminsit3899 Жыл бұрын
Hi Prof. William, what is the fit value at 31:39 before solving the Ro by solver? Also, while using the solver to fit the solubility, there could be many solutions that can also satisfy the fit function =1.
@dw-pchem
@dw-pchem Жыл бұрын
Yes, you are right. There are an infinite number of Ro's that satisfy a perfect fit value, in theory. Especially if you have a small set of solvents. I do not like to use fewer than 20 solvents when determining a solubility sphere. There is a unique Ro, however, that is dependent upon your solvent set. It is the minimum Ro that contains all the good solvents. I typically start with a small Ro, then use solver to optimize the D, P, and H values. Then, I increase Ro "by hand" in Excel until the fit value hits 1. Solver should put the center of the sphere in the middle of all the good solvents, and the Ro will eventually capture all the good solvents. Ocasionally, there is a bad solvent inside the sphere (or a good solvent outside the "reasonable Ro", which is typically methanol). In these cases, I stop when the Ro captures the good solvents (without methanol). They call methanol "chameleonic" because it behaves as a good solvent even when it shouldn't in many cases. This has been explained because it is an extremely small molecule and can interact and disrupt solid substances and polymer matrices more quickly and easily - essentially a kinetic argument.
@benjaminsit3899
@benjaminsit3899 Жыл бұрын
@@dw-pchem Hi Prof. William, much appreciated for your detailed explanation. With the small Ro in mind, do you mean to "guess" the polymer with Ro starting with an arbitrary number, say 3, and let the solver to optimize it?
@darren.williams
@darren.williams Жыл бұрын
@@benjaminsit3899 yes. I start with an Ro that is too small so Solver can optimize the center of the sphere.
@nate417
@nate417 Жыл бұрын
I appreciate your explanations of the Grotrian Diagrams!
@dw-pchem
@dw-pchem 2 ай бұрын
I'm so glad you found it useful. There is a fantastic amount of information on the NIST ASD.
@shreyashgujar3153
@shreyashgujar3153 Жыл бұрын
What if I don't know R0? Can i compare the D,P,H values of a polymer and a particular solvent which are almost the same and assume the Ra of that solvent as the R0 of the polymer to find other solvents that lie inside the sphere?