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For Tahoka Formation, how do I write the dot between the water and the rest of the formula? Jo-Jo Eumerus ( talk) 09:51, 28 February 2024 (UTC)
I propose splitting X-ray diffraction out of X-ray crystallography, discussion started at Talk:X-ray crystallography#Split x-ray diffraction and crystallography. The two are not the same, and there are many areas of XRD where the focus is not on detailed determination of atomic positions. Examples are powder diffraction where comparison is made to known samples, SAXS and many more. There are many areas/pages where it is relevant to say "use XRD" but wrong to say use "X-ray crystallography This would also help to improve the current rambling X-ray crystallography page. Comments to the X-ray crystallography talk page please. Ldm1954 ( talk) 08:40, 14 April 2024 (UTC)
Is there a reason the definition of chemical element seems to vary according to the date you look at the article ? Currently it is defined as a monotypical atomic substance, but a few years ago it was the "species of atom with same atomic number" that was used. I wonder why it's not even mentioned in the article now, the Goldbook cited in the introduction gives the two. frwiki, dewiki, itwiki uses the atomic one, if I'm not mistaken.
The first one seems more complicated and actually a bit dated/historical, the second one is more convenient. The first one is « simple substance » on Wikidata and there are several wikis that have articles about that. Maybe we should sort the interwikis and move articles to the right item ? TomT0m ( talk) 19:26, 22 April 2024 (UTC)
Nucleobase is the heterocyclic variable group, nucleoside is nucleobase+sugar, nucleotide is nucleotide+phosphate. Is there a term for the parent category containing all of those? I'm working on organizing some synthetic-biology chemical pages, for which we don't have very many of any one of those three but we have some and they do form a coherent topic set. DMacks ( talk) 16:39, 1 May 2024 (UTC)
I am asking for the support of this community to move the following page from drafts to articles: /info/en/?search=Draft_talk:Baltic_Chemistry_Olympiad. That will help with increasing the coverage of chemistry competitions.
Wikipedia covers several major competitions, such as the International Chemistry Olympiad and USNCO. However, there should be more pages to raise awareness. I have written a detailed overview of the Baltic Chemistry Olympiad and Competitions. It is one of the oldest international competitions, which over 30 years generated over 180 problems for training students and popularising chemistry.
Olunet ( talk) 10:04, 11 May 2024 (UTC)
I just found ninovium article. I think this article should either be merged with Victor Ninov or with oganesson. Could somebody please take a look? ReyHahn ( talk) 13:26, 15 May 2024 (UTC)
Hi all, I am a new user I was refining Draft:Fausto Calderazzo and I have moved some of the content in the article Migratory insertion. I have also enlarged the article Insertion reaction. Could you please provide some feedback? Thank you in advance.-- Diegoriccio98 ( talk) 13:14, 17 May 2024 (UTC)
Would I be correct in my belief that the phosphate groups in DNA and RNA are chiral at P? Project Osprey ( talk) 19:44, 26 May 2024 (UTC)
Thank you both. I've added a picture to try and help explain myself. The organophosphate groups here consist of a P bonded to 4 different groups, arraigned in rough tetrahedron O=P(O-)(OR1)(OR2). If that P was a C it would undoubtedly be chiral (obviously allowing for the =O being some other comparable group that satisfies the bond order). Synpath raises the issue of resonance but that isn't really a description of the ground state, I think at most that would allow the molecule to convert between 2 or more forms, all of which would be chiral. I'm also not sure how much phosphate is able to engage in resonance anyway, the bonding around P is exceedingly complex and I barely understand it - but to my mind the process of resonance shares themes with SN2 attack (no change in overall bond number, even at the transition state). Hydrolysis reactions are incredibly slow in phosphates, the uncatalyzed hydrolysis of dimethyl phosphate proceeds at about 1 × 10−15 s−1 [1] that's a half life of thousands of years.
[resonance] would allow the molecule to convert between 2 or more forms, all of which would be chiral.there is technically no interconversion between forms in resonance. The discreet resonance contributors we draw are just the extremes the molecule could take on, and the reality is closer to the weighted average of these contributors. That's why if you have a 50/50 mix of two resonance contributors of opposite chirality the actual molecule is achiral.
An insource search shows that we currently have 70 cases where Sciencemadness.org has been used in chemistry articles. Some uses (e.g. in Copper(I) phosphide, current citation #6) have that wiki as a source for our Wikipedia article, although Sciencemadness itself usually does not cite any sources and is clearly not reliable by our standards. More worryingly, it seems that many of the instances of links to that website are to books and articles which are copyright. For example, Tetrafluorohydrazine has a citation #3 to John Drury Clark's 1972 book "Ignition" with a link to a scanned copy as a .pdf. I think we need to go through all 70 instances and either remove the cite or, if the cite itself is valid, remove the links to the copyvio. Comments? Mike Turnbull ( talk) 14:29, 28 May 2024 (UTC)
Ok, maybe we transition to a related topic. If one does not have access to basic textbooks, it is next to impossible to edit technical content. "Crystal field excitation" is not a term encountered very often. Yes, one can imagine what it is, but the phrase is not indexed in usual textbooks (Wiberg, Cotton&Wilk, Shriver). My somewhat obnoxious point is that if one is struggling to find a source for a topic, maybe that topic does not merit an article. -- Smokefoot ( talk) 17:23, 28 May 2024 (UTC)
I originally asked about this topic here in Helpdesk. It was suggested that before applying for the move of the article, there should be some discussion about how to name it.
The " Monolayer-protected cluster molecules" page is focused on the crystal structures of these nanoclusters in a list-like manner. The current tittle was generated when the page was accepted but it seems too general or ambiguous. There already exists pages like Nanocluster and Thiolate-protected gold cluster, tittles of which feel very similar, even if the contents serve a different purpose. I would call the page as "Crystallized monolayer-protected clusters" or "List of crystallized monolayer-protected clusters". In the text it was stated that "This article is designed to be a list of known structures of MPCs", therefore the new tittle would reflect more clearly the contents than the current one. What do you suggest? Iridium27 ( talk) 09:28, 30 May 2024 (UTC)
This is the
talk page for discussing
WikiProject Chemistry and anything related to its purposes and tasks. |
|
Archives: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54Auto-archiving period: 90 days |
Chemistry Project‑class | |||||||
|
Article alerts |
---|
Articles for deletion
Proposed deletions
Categories for discussion
Templates for discussion
Redirects for discussion
Miscellany for deletion
Featured article candidates Good article nominees
Requested moves
Articles to be merged
Articles to be split
Articles for creation
|
For Tahoka Formation, how do I write the dot between the water and the rest of the formula? Jo-Jo Eumerus ( talk) 09:51, 28 February 2024 (UTC)
I propose splitting X-ray diffraction out of X-ray crystallography, discussion started at Talk:X-ray crystallography#Split x-ray diffraction and crystallography. The two are not the same, and there are many areas of XRD where the focus is not on detailed determination of atomic positions. Examples are powder diffraction where comparison is made to known samples, SAXS and many more. There are many areas/pages where it is relevant to say "use XRD" but wrong to say use "X-ray crystallography This would also help to improve the current rambling X-ray crystallography page. Comments to the X-ray crystallography talk page please. Ldm1954 ( talk) 08:40, 14 April 2024 (UTC)
Is there a reason the definition of chemical element seems to vary according to the date you look at the article ? Currently it is defined as a monotypical atomic substance, but a few years ago it was the "species of atom with same atomic number" that was used. I wonder why it's not even mentioned in the article now, the Goldbook cited in the introduction gives the two. frwiki, dewiki, itwiki uses the atomic one, if I'm not mistaken.
The first one seems more complicated and actually a bit dated/historical, the second one is more convenient. The first one is « simple substance » on Wikidata and there are several wikis that have articles about that. Maybe we should sort the interwikis and move articles to the right item ? TomT0m ( talk) 19:26, 22 April 2024 (UTC)
Nucleobase is the heterocyclic variable group, nucleoside is nucleobase+sugar, nucleotide is nucleotide+phosphate. Is there a term for the parent category containing all of those? I'm working on organizing some synthetic-biology chemical pages, for which we don't have very many of any one of those three but we have some and they do form a coherent topic set. DMacks ( talk) 16:39, 1 May 2024 (UTC)
I am asking for the support of this community to move the following page from drafts to articles: /info/en/?search=Draft_talk:Baltic_Chemistry_Olympiad. That will help with increasing the coverage of chemistry competitions.
Wikipedia covers several major competitions, such as the International Chemistry Olympiad and USNCO. However, there should be more pages to raise awareness. I have written a detailed overview of the Baltic Chemistry Olympiad and Competitions. It is one of the oldest international competitions, which over 30 years generated over 180 problems for training students and popularising chemistry.
Olunet ( talk) 10:04, 11 May 2024 (UTC)
I just found ninovium article. I think this article should either be merged with Victor Ninov or with oganesson. Could somebody please take a look? ReyHahn ( talk) 13:26, 15 May 2024 (UTC)
Hi all, I am a new user I was refining Draft:Fausto Calderazzo and I have moved some of the content in the article Migratory insertion. I have also enlarged the article Insertion reaction. Could you please provide some feedback? Thank you in advance.-- Diegoriccio98 ( talk) 13:14, 17 May 2024 (UTC)
Would I be correct in my belief that the phosphate groups in DNA and RNA are chiral at P? Project Osprey ( talk) 19:44, 26 May 2024 (UTC)
Thank you both. I've added a picture to try and help explain myself. The organophosphate groups here consist of a P bonded to 4 different groups, arraigned in rough tetrahedron O=P(O-)(OR1)(OR2). If that P was a C it would undoubtedly be chiral (obviously allowing for the =O being some other comparable group that satisfies the bond order). Synpath raises the issue of resonance but that isn't really a description of the ground state, I think at most that would allow the molecule to convert between 2 or more forms, all of which would be chiral. I'm also not sure how much phosphate is able to engage in resonance anyway, the bonding around P is exceedingly complex and I barely understand it - but to my mind the process of resonance shares themes with SN2 attack (no change in overall bond number, even at the transition state). Hydrolysis reactions are incredibly slow in phosphates, the uncatalyzed hydrolysis of dimethyl phosphate proceeds at about 1 × 10−15 s−1 [1] that's a half life of thousands of years.
[resonance] would allow the molecule to convert between 2 or more forms, all of which would be chiral.there is technically no interconversion between forms in resonance. The discreet resonance contributors we draw are just the extremes the molecule could take on, and the reality is closer to the weighted average of these contributors. That's why if you have a 50/50 mix of two resonance contributors of opposite chirality the actual molecule is achiral.
An insource search shows that we currently have 70 cases where Sciencemadness.org has been used in chemistry articles. Some uses (e.g. in Copper(I) phosphide, current citation #6) have that wiki as a source for our Wikipedia article, although Sciencemadness itself usually does not cite any sources and is clearly not reliable by our standards. More worryingly, it seems that many of the instances of links to that website are to books and articles which are copyright. For example, Tetrafluorohydrazine has a citation #3 to John Drury Clark's 1972 book "Ignition" with a link to a scanned copy as a .pdf. I think we need to go through all 70 instances and either remove the cite or, if the cite itself is valid, remove the links to the copyvio. Comments? Mike Turnbull ( talk) 14:29, 28 May 2024 (UTC)
Ok, maybe we transition to a related topic. If one does not have access to basic textbooks, it is next to impossible to edit technical content. "Crystal field excitation" is not a term encountered very often. Yes, one can imagine what it is, but the phrase is not indexed in usual textbooks (Wiberg, Cotton&Wilk, Shriver). My somewhat obnoxious point is that if one is struggling to find a source for a topic, maybe that topic does not merit an article. -- Smokefoot ( talk) 17:23, 28 May 2024 (UTC)
I originally asked about this topic here in Helpdesk. It was suggested that before applying for the move of the article, there should be some discussion about how to name it.
The " Monolayer-protected cluster molecules" page is focused on the crystal structures of these nanoclusters in a list-like manner. The current tittle was generated when the page was accepted but it seems too general or ambiguous. There already exists pages like Nanocluster and Thiolate-protected gold cluster, tittles of which feel very similar, even if the contents serve a different purpose. I would call the page as "Crystallized monolayer-protected clusters" or "List of crystallized monolayer-protected clusters". In the text it was stated that "This article is designed to be a list of known structures of MPCs", therefore the new tittle would reflect more clearly the contents than the current one. What do you suggest? Iridium27 ( talk) 09:28, 30 May 2024 (UTC)