User talk:H Padleckas/Archive 2

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Welcome to Wikipedia. Thank you for contributions to organic chemistry - especially the nitrile article. Keep up the effort. If you have any questions about Wikipedia, ask.--OldakQuill 12:41, 26 Apr 2004 (UTC)

Is Category:Aromatic Hydrocarbons no longer being used?[edit]

I noticed that on about Jan. 8, you took "Category:Aromatic Hydrocarbons" out of the Benzene, Toluene, and Xylenes articles, even though these compounds are obviously aromatic hydrocarbons. There were no articles in "Category:Aromatic Hydrocarbons" when I last checked, even though there used to be. Is this category now defunct? I was considering putting Styrene in this category. Should I not use this category now for consistency with the rest of Wikipedia? Do you plan to delete it? It seems to me it is a perfectly reasonable category to use for applicable organic compounds. Do you have a better scheme in mind for aromatic organics in Wikipedia? Articles in Wikipedia are allowed to belong to more than one category.
H Padleckas 07:40, 25 Jan 2005 (UTC)


Hi H Padleckas,

I have rearranged the the categories like this:

I would put toluene, xylene, and styrene into Category:Aromatic compounds and, if you want to indicate their hydrocarbon-ness, I would put them also into Category:Hydrocarbons. You may reanimate Category:Aromatic hydrocarbons, but I'm not sure if there is any need for such a subcategory - these compounds have nothing in common in terms of properties or uses.

See also at the end of Talk:Aromatic_hydrocarbon. Cacycle 09:59, 25 Jan 2005 (UTC)


Simple aromatics[edit]

As I wrote a few days ago, I am planning to upload high-res partial images of the current simple aromatics images to the Commons. These split images could then be added vertically to the data tables. This might save you some work. Cacycle 14:16, 12 Apr 2005 (UTC)

Phosphorus trichloride[edit]

Henry,

Can you take a look at this new page on and let me know what you think? Do I need to make it less technical, or there enough there to interest any non-technical person? I would like to write pages on PF3 and PI3 also- these will be briefer, but both compounds still have interesting features, and I have all of the data to hand. I have edited the phosphorus chlorides page accordingly, and I added a bit to that page including a brief mention of P2Cl4. I also fixed the bond angle in the PCl3 picture, though I didn't upload that to the Commons, I wanted you to see it first. Walkerma 18:53, 26 Apr 2005 (UTC)

Soon after I saw this message, I looked over the new Phosphorus trichloride article and made a few changes, mostly editorial. At about that time, I also corrected my PCl3 picture to show the Cl-P-Cl agle was 100°, but some things came up that I had to attend to at that time. I thought I uploaded my corrected picture, but upon checking the Wiki-histories, I apparently forgot to upload it. Sorry it took me so long to respond back here. My corrected PCl3 picture showing the 100° angle will take up less memory than your image; i. e., about 12 kB vs. 19 kB for yours. In a few places, it is slightly sharper and the electrons in the pair are rounded, but the electrons are slightly bigger than the electrons in my improved PBr3 pic. If you think I should upload it, let me know; i'll upload it into WikiCommons over my previous picture. Later on, then your 19 kB picture can be deleted from Wikipedia by an administrator.
I have also just made a similar picture of POCl3 showing a Cl-P-Cl angle of 103° and a P=O double bond, but I have not uploaded it yet. I found an inorganic chemistry book at my local library that said the Cl-P-Cl angle for POCl3 was 103.3°. If you think the PO bond should be shown as P+−O-, or something else, let me know; I can fix it and then upload it.
I also looked in the chemistry books at the local general library for a specific mention of PCl3 + an alcohol R-OH yielding an alkyl chloride R-Cl, but I didn't find one for Cl, although a similar reaction for PBr3 was given. The intruductory and Precautions sections in Phosphorus trichloride mention reducing and oxidizing. Therefore, I mentioned the oxidation numbers for P (+3) and for Cl (-1) in the PCl3 edit I made. I later checked two advance inorganic chemistry books for an explanation of oxidation numbers on atoms in compound, but I found such explanations were omitted, although oxidation and reduction of various compounds were discussed throughout the books. Perhaps, this is because assigning oxidations numbers like that was an artificial arbitrary method that really doesn't matter that much because it's the difference in oxidation states before and after in a reaction that really counts. Maybe, they didn't want to get into an arbitrary explanation and they deliberately left it out.
I added the standard enthalpy of formation to the Table of Properties as well as leaving it in the text. The mention of the dipole moment, the bond angle, and the NMR shift seemed to me a bit technical for the general reader of Wikipedia, but I left them in there.
An uninterested reader can ignore those and still comprehend the rest of the article. After all, this article is about a chemical. I added brief explanations of phenyl (Ph) and ethyl for the benefit of the average reader. The link to Phosphine led to an article that mostly discusses PH3 and only the "Chemistry" section mentions substituted phosphines, so I modified the link to go that that section of the Phosphine article. Overall, the article looks pretty good right now - good job! H Padleckas 21:18, 6 May 2005 (UTC)[reply]
Thanks for your comments and for looking over this as well as the bromide & fluoride, and catching my mistakes. The PF3 bond angle is interesting- an older source gave the 104 ° value, but a newer one (ref. 1) gave the lower figure, and I tend to believe Greenwood & Earnshaw (by the way, that book is a FANTASTIC source of material on inorganic compounds). To give you an idea, it has a chart showing 27 reactions of PCl3! I think I may write a separate page called Phosphines to cover the family of things like triphenylphosphine, probably when I get to work on the latter. The PBr5 page was a surprise, by the way, someone randomly started a stub on it, so I thought I should put a little more up. I agree about the more technical info, but I also know that simple info like a 31P chemical shift can be very hard to find- that's why I think the supplement idea will work well in the long run. Dipole moments are often taught in first year college chem classes, and PX3 molecules are great examples because the dipole moment is "proof" of the lone pair being present (c.f. AlX3 monomer). Regarding PF3, I accept that it has no industrial use, but that doesn't mean it doesn't "deserve" a page- from an academic perspective it is truly a fascinating molecule, its ability to bind like carbon monoxide, and form stable compounds with metals with a zero oxidation state. It was easy to write when the books were open at those pages anyway. I may well write PI3 soon to complete the series, that has a bond angle of 102°, and I'll do POCl3. The Toy book lists the Cl-P-Cl bond angle in POCl3 as 106°, but this is based on sources 1968 and earlier, is your source more recent? Walkerma 16:35, 7 May 2005 (UTC)[reply]
I looked at the inorganic chemistry book that I mentioned earlier here above that said the Cl-P-Cl angle in POCl3 = 103.3° and I made it Reference 1 in the Phosphorus chlorides article.
  1. Appendix B, p. 897. William W. Porterfield, Inorganic Chemistry - A Unified Approach, 2nd Edition, (1993). Academic Press, Inc., San Diego.
In Appendix B (VSEPR Geometry, Prediction and Hybridization) at the end of this book on p. 897, the first example after the nine points are covered is phosphoryl chloride POCl3. It says that VSEPR theory predicts a tetrahedron, but the four electrons in the P=O bond will compress the P-Cl bonds, so the expected Cl-P-Cl angle should be less than 109°; then "Experimentally, the angle is 103.3°". Then other examples are given. The Appendices in this book don't have references, but the first and second editions of the book came out in 1984 and 1993 respectively, so I think the data was obtained significantly more recently than 1968.
So I downloaded my picture if POCl3 showing 103° angle into WikiCommons and inserted it into this article. When a fuller article is developed on this compound, the picture can be moved over there. I have a little more information to put in about POCl3 and PCl5 and then I be be essentially done with this article. H Padleckas 08:12, 19 May 2005 (UTC)[reply]


Tetramethylsilane and trimethylsilyl[edit]

Hello! I like your article about TMS and TMS, and I'd like to contribute more to these two compound/group. I think both the chemical and functional group deserve seperate pages, as they are chemically and functionally different. Before I start the process of separating these pages, I wanted to ask you: Why did you put them together? ~K 03:52, 2 Jun 2005 (UTC)

They have some aspects in common, like the acronym TMS and of course some similarities in chemical structure and NMR chemical shift on the methyl groups, and I mentioned that tetramethylsilane has the trimethylsilyl group in it. Perhaps an even more important reason that I lumped them together is that I did not think there is enough material for a separate Trimethylsilyl group article. There is a link to a "tetramethylsilyl group" in another Wikipedia article (can't recall which now). There is a link in the "chemical shift" article (and maybe some others) to "tetramethylsilane". Eventually, a Tetramethylsilane article should have a Table of Properties in it like most chemical compounds should have, but I can say that also for several other chemical compound articles I've started. It just takes time to get to making the Tables.
For now, I'm done with this article and I have plenty of other things to keep me busy, so go ahead and contribute more. If you think you have enough material on trimethylsilyl groups to separate the combined topic into two articles, go right ahead and separate them. With a Table of Properties and some mention of the physical properties, Tetramethylsilane can be turned into an article by itself. I have not found a reference for using a trimethylsilyl group as a blocking group, so I was thinking of deleting that sentence. Good luck. H Padleckas 05:10, 2 Jun 2005 (UTC)

chess template[edit]

Last night, all of the colored squares in the Wikipedia chess tournament boards became white for me, making it impossible to distinguish light-color squares from dark squares. I much prefer the previous colors. H Padleckas 14:41, 19 Jun 2005 (UTC)

Well, the intention of course wasn't to make all the squares the same color. In my browser it looks the same as it did two days ago. Anyway, I've modified the template slightly. Does the board at Template talk:Chess position t look right for you, with green and white squares? Thanks, dbenbenn | talk 18:02, 19 Jun 2005 (UTC)
I just checked my chess game. Now I see green and "cream"-colored squares. I think that's much better. Thank you for the fix. H Padleckas 18:11, 19 Jun 2005 (UTC)
Oops! I just checked the template in the above link you gave. The squares still look mostly white. I will check again. H Padleckas 18:15, 19 Jun 2005 (UTC)
The template was reverted, since it didn't work. The version at Template talk:Chess position t is for testing, to get the kinks worked out. What browser are you using? "Mostly white": do some of the squares look green? Thanks, dbenbenn | talk 18:54, 19 Jun 2005 (UTC)

Phosphoric acids and Phosphates[edit]

As I mentioned, please feel free to make any improvements to phosphoric acid that you can! As for your (excellent) generic article, I should point out that the WikiStylePolice would put it at Phosphoric acids and phosphates... Physchim62 17:09, 27 October 2005 (UTC)[reply]

It took me a while to get to it, but I have improved the Phosphoric acid article pretty much to my satisfaction. H Padleckas 21:09, 23 August 2006 (UTC)[reply]

Triazine pictures[edit]

Hi Henry, where (or how) did you find those nice triazine pictures in 1,3,5-Triazine. I had been looking for a better pictures for the article, but failed to find any. What is the trick? (Or did you make them yourself quickly)? Wim van Dorst 08:40, 29 October 2005 (UTC).[reply]

I make practically all the diagrams and pictures myself that I upload and use in WikiCommons, Wikipedia, Wikibooks, and any other Wikimedia, including Image:Triazine isomers.PNG. Also, sometimes I do insert into articles images made by other people which have already been uploaded into Wikimedia. I can make all kinds of chemical structures, so if you need something like a chemical structure, let me know. I can try to make it for you. To get an example of the chemical structure and reaction images I've made, look under my User contributions in WikiCommons, where I probably have 70 or more of my images uploaded. I can't make pictures of everything, for example 3D structures are difficult for me, especially if they involve shading of color, but I can try.
I wrote a couple of chapters on Algebra in Wikibooks where I made all the graphs; see Wikibooks:Algebra:Function graphing and Wikibooks:Algebra:Systems of Simultaneous Equations. I wrote a couple of chapters on geometry in Wikibooks where I made the 2D diagrams; see Wikibooks:Triangle and Wikibooks:Right Triangles and Pythagorean Theorem (Those were some of my earliest and more primitive diagrams in Wikimedia. Since then I've gained more experience and my diagrams might come out slightly better now). I also wrote the chapter Wikibooks:Modern Physics:Coulomb's Law and the Electric Field and made the diagram in there. I also made the following math graphs/diagrams in Wikibooks (or WikiCommons): Image:3D Cartesian coordinates.PNG, Wikibooks:Image:Polar coordinates.PNG, Wikibooks:Image:Point in Polar coordinates.PNG, and Wikibooks:Image:Region on complex plane.PNG. I have also taken pictures from other parts of Wikimedia and improved them. I know some tricks to do it and I am quite good at certain aspects of those modications. For example, I've twice taken map images from one language and relabeled the names in another language; see map in Curonian Spit and map of Russia in lt:Vaizdas:Rusijos zemelapis.PNG. I have improved the crystal structure diagram in Sodium chloride and Ionic crystal (look at an enlarged version to see the differences better), one of the diagrams on Mendel's genetics laws (slightly), made small improvements in some chemical reaction images, reversed the colors and made other slight improvements to the original titration image to make the acid titration image used in Hydrochloric acid, improved the diagram in the Ellipse article, improved the Image:Menthols.PNG pic, modified the apple-slicing function and used it to make the inverse fruit function and composite fruit function in Wikibooks:Algebra:Functions, and so on. I made the polymerization reaction mechanism images in Polycarbonate. I can make slight modifications to photo images too, like taking out certain things in a rather even-colored background. Someday, I hope to make chemical reaction images showing polymerization of isoprene, of 1,3-butadiene, and of styrene maybe. If you think I can help you with something, let me know. H Padleckas 20:05, 29 October 2005 (UTC)[reply]
I've made the polymerization of styrene pic I mentioned above and uploaded it into the Polystyrene article. H Padleckas 13:46, 18 November 2005 (UTC)[reply]
Thanks, Wim.  :-) I started working on the "Polymerization of 1,3-Butadiene" pic.
H Padleckas 05:49, 19 November 2005 (UTC)[reply]
I've finished the "Polymerization of 1,3-Butadiene" picture and I expanded the Polybutadiene article from a two-sentence stub as well. The picture is in this article. I have yet to start a "Polymerization of Isoprene" picture and I probably will not for quite a while. However, I'm working offline on improving the diagram in the Condenser (steam turbine) article. When I eventually finish it, I plan to upload it into Wikipedia to replace the existing diagram. It will be the same as the existing diagram with a few modifications. H Padleckas 06:46, 14 December 2005 (UTC)[reply]
I've finished modifying and uploaded the diagram in the Condenser (steam turbine) article. H Padleckas 08:39, 22 December 2005 (UTC)[reply]

Image Tagging Image:Ester hydrolysis.PNG[edit]

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The image is ineligible for copyright. I have tagged it as appropriate. Elle vécut heureuse à jamais (Be eudaimonic!) 20:17, 12 March 2006 (UTC)[reply]

Wikipedia:Chess championship/Tournament 1/Double-Elimination/Game 10[edit]

You are playing Linuxbeak. I created the page. After so many months, I don't know what to say, but, hey, hope we can wrap this tournament up to start a new one! Elle vécut heureuse à jamais (Be eudaimonic!) 20:13, 12 March 2006 (UTC)[reply]

So... who goes first? Linuxbeak (drop me a line) 18:19, 19 March 2006 (UTC)[reply]

Image copyright problem with Image:Bisphenol A plus NaOH.PNG[edit]

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Please signify the copyright information on any other images you have uploaded or will upload. Remember that images without this important information can be deleted by an administrator. If you have any questions, feel free to contact me. Thank you. Stan 02:28, 17 March 2006 (UTC)[reply]

Image copyright problem with Image:Bisphenolate_A_plus_Phosgene.PNG[edit]

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Round-bottom flask[edit]

Hi, thanks for starting the round-bottom flask article. Never noticed that such a basic thing as a round-bottom flask was missing from Wikipedia, while articles on retort do exist for some time already. --Dirk Beetstra T C 07:49, 23 June 2006 (UTC)[reply]

Lab glassware article[edit]

Henry,

Good to hear from you! Yes, that article would make an excellent replacement on the list (I suggested the MP test, so I can likewise remove it). I think we chose to exclude it from the list before because it was just a short list, nothing more - and now it's a very nice article! We need more of these broader articles, which are usually harder to write. Your pictures of the ground glass joints are wonderful! Would you mind if I rewrite the sections on cleaning solutions, as several of these methods were banned in all the colleges I've been to. I don't mind us indicating that such things have been common practice, but I don't want to see people trying such things at home! I may try to add a little material and few refs to the article - did you use Vogel or some other source?

Also, I'd like to see the Chem folks have a go at another FAC, and we came up with Antoine Lavoisier - would you be able to help with that? Cheers, Walkerma 16:25, 18 August 2006 (UTC)[reply]

Thanks for complimenting my work on this article. Go ahead and modify the sections on cleaning solutions and add more material and references as you see fit. Someone else wrote those cleaning sections and judging from subtle grammatical style, that person may have been from a foreign country (I should check I suppose), who is not as familiar with local rules. I wrote practically all the lab glassware sections I added from practical exposure or experience and I only looked up a couple details on the net. I did not use Vogel as a source (to my knowledge anyway; is it a book?). Someday, I was thinking of mentioning a few words about clamps, etc. to hold assembled glass set-ups in use (in the "Use" section), and maybe also mention something about glass vacuum manifolds (cold traps, vacuum "distillations", stopcocks, etc.) towards the end of the article. The melting point test discussion can be included under the Melting point article, maybe. H Padleckas 19:18, 18 August 2006 (UTC)[reply]
A day or two ago, I added Organic Chemistry, Chemical engineering, and Polymers as interests of mine in the participant list in Wikipedia:WikiProject Chemicals#Participants.
I have degrees in chemistry and chemical engineering. Speaking of broader articles which you said we need more of and chemical engineering, within the past week, I wrote a major expansion of the article "Valve", from a stubby article with a list of valves to a much more developed article, in which I wrote the sections from "Application" to "Other considerations", inclusive. Earlier this spring/summer, I expanded the not as broad article "Shell and tube heat exchanger" adding 3 diagrams. Also, several days ago, I wrote the rather "narrow subject" article "Plug valve" and offline I am expanding "Check valve" and starting to write a new article "Metering pump". I already inserted a paragraph on glass stopcocks in "Stopcock" (related to lab glassware). Metering pumps are often very similar to high pressure chromatography pumps. It would take a lot of work for me to make any diagrams for these articles.
Sometime between 5 to 10 years ago, I read many of the writings of Antoine Lavoisier.
I could see that in his day he was a walking chemistry encyclopedia. I'm afraid it's been so long that I would probably be of little use in making contributions to his article. I might review the article though some time anyway. H Padleckas 01:01, 19 August 2006 (UTC)[reply]
Vogel a British book, it is to the lab what Jerry March is to the lecture hall - take a look at the Amazon entry. My background is pure chemistry, but I worked for 12 years in the fine chemicals industry, so some of your topics seem familiar! In fact I've even taught a class a couple of times on chemical manufacturing, and you might have enjoyed this old lecture of mine, that shows you the type of thing I used to do. I'll try to work on the glassware article this weekend, but Version 0.5 keeps me very busy these days! Cheers, Walkerma 03:18, 19 August 2006 (UTC)[reply]

Phosphorus chlorides[edit]

Hi Henry, you might want to give your comments on this proposal. Hope you're doing well! Walkerma 04:50, 15 October 2006 (UTC)[reply]

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