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This is an old revision of this page, as edited by Rikku (talk | contribs) at 18:28, 24 January 2009. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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Category

Why is this article in Category:Chemical element symbol templates? There is something weird with it, but I can't find it. --Kenyon 09:12, 27 November 2005 (UTC)[reply]

It's because you added subst to the templates that link to the chemical symbols, so that it read {{subst:carbon}} instead of just {{carbon}}: the entire template was thus inserted into the article, including the template category. The moral is "don't use subst for the chemical element symbol templates"! Physchim62 (talk) 09:44, 27 November 2005 (UTC)[reply]
Now they could be subst'd after that noinclude block is added to each one, right? Because on Wikipedia:Subst the chemical templates are listed under "Templates that should be subst'd". --Kenyon 18:23, 27 November 2005 (UTC)[reply]

Diagram

The image shown is actually a structural diagram of Maleic Acid, not fumaric. This is so because fumaric acid is a trans isomer of butenedioic acid, not a cis isomer (the OH and O groups should be on opposite sides of the final carbons).

The image is correct. Fumaric acid is the trans isomer, which is what is shown in the image. Maleic acid is the cis isomer, which is what is shown in the image on that page. --Ed (Edgar181) 18:14, 10 October 2006 (UTC)[reply]

cis or trans?

In the diagram how is it the trans isomer if the OH groups are both on the bottom, and the O groups are both on the top of the double bond? Shouldn't they be on opposite sides?— Preceding unsigned comment added by 64.21.7.136 (talk • contribs)

The picture is correct, there is rotation around the single C-C-bonds, and the trans describes the conformation of the double bond. But apparently the picture is a bit misleading. Maybe someone has to change the picture. But I hope this helps. --Dirk Beetstra T C 18:25, 10 November 2006 (UTC)[reply]
Image:Fumaric acid.svg looks perfect to me. I don't see what the confusion is about. —Keenan Pepper 19:52, 10 November 2006 (UTC)[reply]

I think the confusion might be cleared up if you looked at this chemical's "real" name—fumaric acid is "scientifically" known as trans-1,2-ethylenedicarboxylic acid. The "trans" describes the carboxylic acid functional group's (COOH) position relative to the double bond in the "base" ethylene molecule. You can see that the COOH groups on the left and right side of the molecule are on opposite sides of the double bond between C1 and C2 of the ethylene.

Compare this diagram with cis-1,2-ethylenedicarboxylic acid (maleic acid) and you will see that the carboxylic acid functional groups are on the "same side" of the double bond between C1 and C2 in the ethylene portion of the molecule.

Sorry if you don't get this.

Rikku (talk) 18:25, 24 January 2009 (UTC)[reply]

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This article talk page was automatically added with {{WikiProject Food and drink}} banner as it falls under Category:Food or one of its subcategories. If you find this addition an error, Kindly undo the changes and update the inappropriate categories if needed. The bot was instructed to tagg these articles upon consenus from WikiProject Food and drink. You can find the related request for tagging here . Maximum and carefull attention was done to avoid any wrongly tagging any categories , but mistakes may happen... If you have concerns , please inform on the project talk page -- TinucherianBot (talk) 17:39, 3 July 2008 (UTC)[reply]

colourless crystalline or white solid

make your mind up. —Preceding unsigned comment added by 82.42.32.182 (talk) 21:50, 23 October 2008 (UTC)[reply]


References/Citations

Why are there no relevant citations for all of the "facts" presented here? Rikku (talk) 18:28, 24 January 2009 (UTC)[reply]

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