Talk:Q79529
Autodescription — chemical substance (Q79529)
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- View it! – Images depicting the item on Commons
- Report on constraint conformation of “chemical substance” claims and statements. Constraints report for items data
- Parent classes (classes of items which contain this one item)
- Subclasses (classes which contain special kinds of items of this class)
- ⟨
chemical substance⟩ on wikidata tree visualisation (external tool)(depth=1) - Generic queries for classes
Union and disjoint queries
- Instances of chemical substance (Q79529)
that are instances of none of the classes pure substance (Q578779) and mixture (Q169336) [1]
- See also
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{{Item documentation}}.
Add new chemical properties[edit]
Hi, does this page is the right place to discuss about adding new chemical properties ? I think about adding the property "standard boiling point". What do you think about this idea? Kelson (talk) 12:45, 24 April 2015 (UTC)
- @Kelson: May be here or pages next to are a better place. Thank you for your ideas. Regards, Conny (talk) 12:55, 24 April 2015 (UTC).
- @Kelson: Already proposed and waiting for the appropriate datatype. Snipre (talk) 13:25, 24 April 2015 (UTC)
- Thank you both for these valuables links. Kelson (talk) 13:57, 24 April 2015 (UTC)
elements / corps / atoms ...[edit]
@Infovarius:: We need to get straight on definitions. On frwiki, what is called a "chemical element" on en:chemical element is called "simple corps" https://fr.wikipedia.org/wiki/Corps_simple and "corps" are definite bodies of matter or substance. In that sense, corps are bodies of matter. So why the substitution ? author TomT0m / talk page 17:22, 20 November 2015 (UTC)
- Yes, we need. 1) in fr:Corp simple they say about substance consisting of 1 chemical element, not the same as this item; 2) the main aim of the property is to show that matter can be represented in 2 forms: as a substance or as a field. --Infovarius (talk) 19:52, 26 November 2015 (UTC)
- @Infovarius: 2) the main aim of the property=> which property, first, and second, are you reffering to wave–particle duality (Q193068) ? Because in my understanding a field has a corresponding particle, but a particule is not a field ... Here the en label of this item is "chemical substance", so I don't understand how it's related to fields. author TomT0m / talk page 20:06, 26 November 2015 (UTC)
- I suppose we are talking about chemical substance (Q79529) subclass of (P279) matter (Q35758) and you don't want it. Let's talk about definition of "matter". What do you think it's consist of? I believe that field is another form of matter (it doesn't depend on wave–particle duality (Q193068)). --Infovarius (talk) 07:41, 1 December 2015 (UTC)
- @Infovarius: I'll ask more than a belief. A field is in the definition of frwiki "En physique, un champ est la donnée, pour chaque point de l'espace-temps, de la valeur d'une grandeur physique" => In physics, a field is the given of a physical value for each point of spacetime. And for "matière" we get
- I suppose we are talking about chemical substance (Q79529) subclass of (P279) matter (Q35758) and you don't want it. Let's talk about definition of "matter". What do you think it's consist of? I believe that field is another form of matter (it doesn't depend on wave–particle duality (Q193068)). --Infovarius (talk) 07:41, 1 December 2015 (UTC)
- @Infovarius: 2) the main aim of the property=> which property, first, and second, are you reffering to wave–particle duality (Q193068)
- La matière est ce qui compose tout corps ayant une réalité tangible. Les quatre états les plus communs sont l'état "solide, l'état liquide, l'état gazeux et l'état plasma. La matière occupe de l'espace et possède une masse. Ainsi, en physique, tout ce qui a une masse est de la matière.
- La matière ordinaire qui nous entoure est formée de baryons et constitue la matière baryonique. Cette définition exclut les bosons fondamentaux, qui transportent les quatre forces fondamentales, bien qu'ils aient une masse et/ou une énergie.
- Ne pas confondre avec matériau, qui est le type, la sorte ou la classe de matière utilisé pour réaliser une pièce." => Matter is what any tangible corps is made of. Ordinary matter is made of baryons and consitutes baryonic matter. This definition excludes fundamental bosons, who carries fundamental forces, although they have a mass and/or energy. Not to be confused with material, who are the sort or type or class of matter a piece is made of. author TomT0m / talk page 18:40, 1 December 2015 (UTC)
- My two cents. Chemical element can't be an chemical substance because the definition of chemical is "Matter of constant composition best characterized by the entities (molecules, formula units, atoms) it is composed of. Physical properties such as density, refractive index, electric conductivity, melting point etc. characterize the chemical substance."
- In reality, apart metals, you can't characterize chemical elements with the proposed porperties: for example hydrogen can't be described by the common physical properties, only dihydrogen can be handled, so we have to differentiate hydrogen as chemical element and dihydrogen as pure chemical substance.
- One question is the definition of "corps simple". The most common is pure chemical substance composed of molecules with only one chemical element. Snipre (talk) 20:08, 1 December 2015 (UTC)
substance chimique pure
Union of...[edit]
@TomT0m: I not really agree with your last statement: a chemical substance can be a simple substance, a chemical compound or a mixture of chemical compounds. Your definition is not including the last group. Example: solution of ammonia in water (ammoniaque in French). This is not a chemical compound or a simple substance but a chemical substance. But with your definition you can't define it as chemical substance as it is not belonging to one of the mentioned classes. Snipre (talk) 16:36, 17 April 2016 (UTC)
- @Snipre: I followed the fact that "substance chimique pure" is an alias in french. Maybe a spurious merge ? On the frwiki article we can read "le mot « préparation » désigne « les mélanges ou solutions composés de deux substances ou plus »1." and your comment seems to be the definition of the union of "pure substance" and "preparation" ... author TomT0m / talk page 16:41, 17 April 2016 (UTC)
Merge? --Fractaler (talk) 09:26, 16 December 2016 (UTC)
Use of IUPAC definition for this item[edit]
Notified participants of WikiProject Chemistry Dear all, I propose to use as description for this item the IUPAC definition:
"Matter of constant composition best characterized by the entities (molecules, formula units, atoms) it is composed of. Physical properties such as density, refractive index, electric conductivity, melting point etc. characterize the chemical substance."
Do you agree ? Snipre (talk) 21:12, 28 June 2017 (UTC)
Concept vs. term[edit]
There is a concept vs. term problem here. a chemical substans can not be a term as the 12 September 2019 version states. — Finn Årup Nielsen (fnielsen) (talk) 13:18, 13 September 2019 (UTC)
- I have now taken the liberty to remove the link to ChEBI Ontology term (Q41014950). It is possible that some othr form of linkage should be made, but I am currently unaware of of any such property. @Egon Willighagen: I am wondering if we have such means? — Finn Årup Nielsen (fnielsen) (talk) 13:20, 13 September 2019 (UTC)