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cogujada

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Everything posted by cogujada

  1. Alright guys so I finally decided to stay in Chem eng, due to the fact that I love the subjects and I don't really know if i'm going to like pure chemistry as much. I don't know what Bs C stands for, but just in case, I was doubting between changing from the chem eng degree to the chemistry degree (at the same University, by the way). I think that choosing the degree for the work you're gonna do is not very intelligent. I mean, jobs change a lot during the curse of the years. I'll stay as I am hahaha Thanks guys!!!
  2. Hey guys. Joigus and Studiot might remember me :) I'm here because I have a question (not a doubt ;) ) Well, let me Introduce myself. I'm 18 years old, I study chem eng (first year, I'm a Freshman hahaha) in Madrid (so maybe my English is a bit weird, so, please, correct me in any errors you might observe). I've been having doubts about what to study since I was 15 years old. Last year (my last year in high school) I reduced my options to only two. Chemical Engineering and Chemistry. I tried to research as much as I could, but I lacked time, so I entered Chem (it was a very hard decision). It's not that I don't like the Subjects, I love them. But I don't know if I'm going to like the work. I've been reading and I've seen that the knowledge of a chem eng about chemistry are very very poor (they know about Thermodynamics, Fluid Mechanics, Processes, etc). The work is repetitive, not very interesting... And i'm quite worried. Firstly, I don't know if changing to Chemistry would be a good option (I wouldn't lose any year, because, at least in Spain, those subjects that you pass and are common to other subjects on other degrees don't need to be studied again). What really puts me back is that maybe I won't like as much the subjects (or maybe yes, who knows). I think the subjects in chem eng are much more practical (I mean practical not in laboratory, but in paper, there's much more about calculating, drawing, thinking, reasoning, etc. than in chemistry). But if I stay at chem eng, maybe, I don't enjoy the career I develop, you know? I've seen that chemists have much more offers, much more enjoyable, non-repetitive works etc. What do you guys think. Should I stay, or should I change? You can ask for more information about my degree, what I like, etc. Cheers!
  3. Hey again. Okay so first of all, I don't know if inversion is spanglish, but I have a question about DMO in TMO. Inversion (at least in Spanish/Spanglish) is when the 2PI(bonding) orbitals have less energy than the 2SIGMA(bonding) orbitals, so they are completed with electrons before the 2SIGMA. I don't know if ' have explained myself, is is quite difficult to translate chemical terminology from English to Spanish. This inversion occurs, for example, in B2, C2 and N2 (because the difference in energy between 2s and 2p orbitals is extremely low). So hold your nose because here comes the question. Why CO suffers inversion and NO doesn't, I mean, why? Both of them have an atom that, by their own, "get inversed". I don't know if you understand me... Thanks btw
  4. Yeah that makes sense to me. Some people told me that it was because Moeller's diagram didn't contemplate exceptions on Nb, Cr, Mo, Cu, Ag, Au, Pd and Pt electronic configuration, but I think (maybe I'm wrong) that Aufbau principle does not contemplate that either. That makes a lot of sense to me. I was looking for some reason to stop using it, and I found one so in a way, you've changed my way of thinking, feel proud!
  5. Well, in Spain we are told that "el saber no ocupa lugar". @joigus can translate it to you hahah Yeah well I'm afraid I've been talking with other first year students (like me) but from other colleges (UAM, UB and UPM) and they don't even know about Schrödinger's equation. I think that she told us that to avoid messing our minds hahaha. I dunno really. Very very good. Thanks, I mean, you've both done more than any other person for me in my academic career I think I know understand much better, not only Schrödinger's equation, but how difficult it gets chemistry when talking about insignificant electrons, what the hell man. Thanks guys hahahahahahah, mate you've been killing it out there explaining it all (along with joigus)... Hopefully, someday, my errors will be as insignificant as yours! Best regards boys! omg, now wtf is going on in my head
  6. Yeah, and it stills follow the criterion of Higher Z, narrower graph and higher peaks (at least according to my teacher). Yeah, seems logical to me, but now that studiot posted the photo (thanks by the way), you can see that for higher Z, the graph is narrower but the peaks are lower (which seems non-sense). No problem, my exam is the 15 of July, so I have still plenty of time haha Thanks to both of you!
  7. yeah I'm afraid I need to ask her, however, what about the peaks? We've seen plotting the graphs (I think that if you click the hyperlink you can see it) that for higher Z, the graph is less spread out and has lower peaks, whereas our teacher told us that the peaks were higher (which makes sense, because the area under the graph has to be 1, and if you make it more narrow you'll have to make it higher no?). On the other hand, I just saw an exercise about the 3p orbital of Cl and S, and it follows the same tendency (for higher Z, narrow graph and higher peaks). Do you consider them as outter electrons?? I want to know what you think about this before asking her
  8. Okay, so the guy that helped me out with this apparently got a bit confused and started to rethink what he told me (the radial wavefunction will be more spread out for higher Z). He has plotted this: Where "The red curve is R20, the dark green is R30, and the bright green (which you can barely see the humps) is R40" As we can see, as Z gets higher, the first maximum gets nearer to the origin of the coordinates, and the peaks get lower. The first part (that the maximums are much closer to the y axis) seems good to me, however the second part (the peaks are lower) does not coincide with what my teacher told us. Do you have something to add @joigus and @studiot?? Thanks guys, you're saving my semester
  9. Don't understand this sorry hahaha Extremely interesting, I knew Nitrogen and Oxygen were exceptions (and also P/S, Be/B and Mg/Al, but I didn't know about As and Se, I thought they weren't involved). I really want to thank you and @joigus, you're really talented guys and very helpful and kind. No worries!! Thanks very ver very much
  10. OMG, I don't know if this is correct, because I just seen another exercise made by my teacher which said that the radial wavefunction would be more spread out for the one with the lower Z. This is so frustrating
  11. Hey, I study chemical engineering in Madrid (Spain). Here, teachers do not like Moeller's diagram (my teacher, for example, has forbidden using it, and instead we use the Aufbau principle, which is similar). I don't know if this happens in your countries, but if it does happen, what are the reasons for this happening? I mean, I don't think there's anything wrong with it. Cheers.
  12. Well I don't know it for certain. All the exercises my teacher did were with outer electrons, except one, she did one with "inner electrons" (I at least consider 2s orbital as inner), and it was the same criterion, however, i'm not 100% sure. Well it's not that I want to know it (I do, I find really triggering chemistry) but our teacher thinks this is extremely important (Schrödinger's equation and the angular&radial part), so important questions about this topic were 50% of the exam. Well, it is good to remember, but I already knew that, as I've said, this seems to be a very very important topic here in Spain (I have a friend who studies Pharmacy and she has been taught too the Schrödinger's equation). But it does not answer my question (I think). I've been investigating and I've found that radial the wavefunction will be more spread out fore higher Z. @joigus helped me and told me that this is, without a shadow of doubt, true for outer electrons, but he's not sure about inner electrons. You know, I could ask my teacher, but I have been asking her a lot of things (as you can imagine, virtual classes are by no means the same as "real" classes) and I'm a bit ashamed of asking her again (and in addition, I've already asked her about Schrödinger's equation, not this topic of polyelectronic atoms specifically, but a question about the angular part of an s orbital). Thanks guys, you're great!
  13. No it's not homework, it's something I found in the Internet. However I have a Chem exam (about this and more topics) in a few weeks. Yeah well what I've deducted is that the radial wavefunction will be more spread out fore higher Z. And thanks for correcting me! Cheers
  14. Hey, I study Chem. eng in Madrid (Spain), so first of all, my English might be awful, so I apologize. I have a doubt about the radial part of polyelectronic atoms (you know, Schrödinger's equation etc). The radial part for Hydrogen is quite simple, but things get difficult when we talk about atoms with more than one electron (due to the shielding effect between electrons). My question is the following: How does the radial part of Schrödinger's equation change for polyelectronic atoms? I know there are a few ways of estimating the new radial part (SCF or STOs) but I don't need that. What I need is how does the graph change. For example, here it is represented the 2s orbital of F and Li. How can I know which one is one in this case? What really bothers me is that I want to know which factors influence the graph and if there is a general rule to know which atom is going to be more diffuse (in this case the blue line) or penetrated (the red line). For example, between two atoms, analyzing the same orbital (for example 2s and 2s, or 3p and 3p etc) the one with the highest Z is the most penetrated, and the one with the lowest Z is the most diffuse (obviously I don't know if this is true hahah, it is an example). You know, something like that so I can answer these type of questions: Plot the graph of the radial part of S and Cl (1s orbital) In order to answer this, what I need is to know which one of them is more penetrated. I don't know if you understand me. Again, sorry, my English is awful... Thank you guys, if there's something you don't understand please tell me and I will answer shortly. By the way, feel free to correct me in any grammatical, spelling error please, I really want to boost my level of English! Cheers
  15. Really don't know what to say hahaha. Thanks to you all guys, I will try to improve my English everyday And for those who might curious, i'm gonna buy the book, 31 pounds is not money at all when we are talking about knowledge. Thanks!
  16. Yeah well, you've got a very interesting point. As a chem eng probably I will use the book only for specific consultations (except this year, I have a subject called Inorganic Chemistry). However, bare in mind that I've found the book at a really cheap and good price, usually, the Spanish version costs 95 € (85 pounds) but I've found a second-hand one for 35 € (31 pounds) which is a third of the original price. Do you think that it is profitable to buy the book (taking into account that I will only use it for specific consultations or to know more about inorganic chemistry)??? Thanks mate! And sorry, I forgot. It is the recommended coursebook. Sorry haha
  17. Hey, I study Chemichal engeneering in Madrid (Spain) and I have a doubt about a book. Do you know if the book Inorganic Chemistry (written by Catherine Housecroft) is the most "advanced" book about Inorganic chemistry (I mean, can I found books much more advanced and more profound, or is the Housecroft valid). I mean, im not going to work as a pure chemist (I think), but I dont want to spend loads of money if I can find better, profound and advanced books (considering that I study Chemical Engeneering and not pure chemistry, obviously). Thanks guys, and sorry for my English, tell me if there's something you dont understand! Cheers
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