Sometimes I have heard: "that is really a woman of substance!"
But what does it mean?
This expression is used to indicate a woman full of personality and character, a person (usually) full of "important matters". Other expressions used are very "let's go to the substance," in essence "," substantially "has the meaning remains the same. Reference is made to its essentials, the point around which you can then build a case, a speech, ecc…
Guardiamo la parola “sostanza” dal punto di vista chimico; e scopriamo che concettualmente il significato non cambia. Guardo su wikipedia e riporto:
In chimica , secondo la IUPAC , si intende per sostanza una specie chimica con proprietà chimico-fisiche specifiche e una composizione chimica definita. Una sostanza costituita da atomi uguali (cioè corrispondenti allo stesso elemento chimico ) viene detta simple substance (for example O 2 , O 3 , N 2 , H 2), while this is essentially composed (or chemical ) if it is made of atoms of different nature (eg H 2 O , CO 2 , H 2 SO 4 ).
a chemical species with specific physical-chemical properties and a definite chemical composition: the carryover why is this phrase that hides a very important concept. Meanwhile, allow me a digression: Have you ever heard the advertising of a product (various uses) where it says "no buffer in chemicals?? Try to read this expression in the light of the definition of substance.
The chemical is "merely" a collection of atoms linked in a certain way, the available space and the order in which these atoms are bound to give some substance properties. The chemical is neither positive nor negative, and there is a substance that is negative! There may
products "without chemicals" as we sometimes hear in advertising?
Water is a chemical species with specific physical and chemical properties (known reactivity, boiling point, freezing point, etc ...) and with a definite chemical composition (of any water we speak, we know that there are two atoms hydrogen and one oxygen atom), so any product that contains just water. ... contains a chemical. On the other hand all matter consists of atoms, then from chemicals ... if he advertised products do not contain matter ... well, let's go to another camp!
Let us consider the commonly used products and try to figure out which of these is a substance. Take the milk. Are now available on the market and many types of milk, from whole to skim to full, to those enriched with antioxidants to a more digestible for those who show intolerance to lactose. Is there a formula that identifies the milk?? The nice Berger suggests that if the formula of water is "two or academic" that the milk could be "two or cow"! There is no formula milk because milk is not a substance but is a collection of several substances.
now consider the water. Although there are a lot of water varianti; c’è quella minerale naturale, quella addizionata con anidride carbonica, quella completamente liscia; in questo caso, diversamente da quanto dicevamo con il latte possiamo facilmente dire qual è la formula: H 2 O (due atomi di idrogeno e uno di ossigeno).
Questa differenza tra latte ed acqua è notevole!!! Se guardo la mia bottiglia di acqua posso immaginare che lì dentro ci sia un numero elevatissimo di molecole tutte composte da due atomi di idrogeno e uno di ossigeno che sono legati tra loro sempre allo stesso modo; ossigeno in mezzo e gli idrogeni ai lati con un angolo H-O-H sempre uguale, ormai misurato e definito. Quello che cambia è il contorno: nell’acqua sono disciolti un large number of salts that confer special properties to the particular water, but in any case there will be prevalent in the bottle molecules of H 2 O. For special uses, eg for iron using distilled water, ie deionized water, or demineralized are different ways of saying the same thing. This is free water usually those salts dissolved in it. The water thus obtained by distillation, or currently, with more complicated methods contains a chemical only molecules H 2 O. Chemically say why, unless you are talking about as well as deionized sterile water (the one you use for the preparation of saline solution) over alle molecole di acqua saranno ancora presenti microrganismi e batteri normalmente presenti nell’acqua. In ogni caso posso procedere alla sterilizzazione e posso conservare l’acqua ottenuta in modo idoneo per evitare che si contamini nuovamente. A questo punto nella mia bottiglia sono presenti esclusivamente molecole di H 2 O. Facendo un viaggio nel microscopico tutto quello che posso vedere sono molecole di acqua; piccoli triangoli senza la base: l’ossigeno ad un vertice e gli idrogeni agli altri due vertici. Potrei immaginare di prendere solo una molecola e in quel caso avrei in mano acqua!!! Certo non mi potrebbe dissetare, certo non potrebbe viverci un pesce, ma le proprietà di quella molecola sono le stesse di quelle dell’acqua "Macroscopic".
The same can not do it with milk.
The milk is not a substance in the milk are water, proteins, fats, organic acids, vitamins, minerals and other elements. They are present in different relative amounts depending on the different types of milk citavamo before, but also on the origin of the milk itself. In the case of milk can proceed with the use of advanced techniques which we now have to separate the components. So we try to find the smallest unit that can call milk can separate the aqueous from the organic and put them in two different containers, in the aqueous phase will be the minerals and trace elements come il cromo, il selenio, lo zinco; nella fase organica ci saranno invece prevalentemente le proteine. Procedo ancora con altre separazioni e continuando così riempirò una serie di contenitori ciascuno dei quali contiene sempre meno tipologie di sostanze insieme, ma nessuna delle quali potrò chiamare latte!!! Il latte non è una sostanza, ma sarà un insieme di sostanze che quando sono presenti tutte insieme prendono il nome di latte.
Un prodotto che posso toccare e vedere si può definire sostanza quando viaggiando all’interno di esso, andando dal macroscopico al microscopico posso trovare quel “principio primo”, quel mattoncino, che replicato esattamente sempre nello stesso modo, un numero molto high times gives me what I saw at the beginning of my journey macroscopically!
think of the adjectives that often follow the word "substance" comes to mind: nutritious food, drug, pollutant, and even more amazing adjectives. I dwell on each of these and try to find the common element. In all cases beyond the end-use is necessarily speaking of compounds composed of atoms whose organization gives the same compound certain special properties. But behind all these are sets of atoms arranged in a definite way with each other. So the nutrients, food, drug, pollutants, drugs are nothing more than chemicals.
The word "chemistry" that is often combined with "substance" to give a generally negative connotation of the word is actually a fact implied. What other types of substance can be identified in the material world?
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