chemical formula

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Chemical formula
A chemical formula is a concise way of expressing information about the atoms that constitute a particular chemical compound. A chemical formula is also a short way of showing how a chemical reaction occurs. For molecular compounds, it identifies each constituent element by its chemical symbol and indicates the number of atoms of each element found in each discrete molecule of that compound. If a molecule contains more than one atom of a particular element, this quantity is indicated using a subscript after the chemical symbol (although 19th-century books often used superscripts). For ionic compounds and other non-molecular substances, the subscripts indicate the ratio of elements in the empirical formula.
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Représentation des molécules
Les représentations de molécules sont utilisées en chimie pour décrire les molécules et leurs structures. Ces représentations graphiques permettent de décrire les liaisons moléculaires, le nombre et le type d'atomes qui composent une molécule, sa forme dans l'espace ou simplement de décrire sommairement la molécule de manière simple et rapide. La plupart de ces représentations sont surtout utilisées en chimie organique ou en biochimie.
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Summenformel
Eine Summenformel, auch Molekülformel (oft auch unpräzise Chemismus), dient in der Chemie dazu, die Anzahl der gleichartigen Atome in einem Molekül oder in der Formeleinheit eines Salzes anzugeben. Sie gibt also das Teilchenzahlenverhältnis und damit auch das Stoffmengenverhältnis der Teilchen an, die im Molekül bzw. in der Formeleinheit enthalten sind.
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Symbolika chemiczna

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Formula chimica
Una formula chimica è una rappresentazione sintetica che descrive quali e quanti atomi vanno a comporre una molecola (o una unità minima) di una sostanza (formula bruta), nonché la loro disposizione nello spazio (formula di struttura).Nella formula bruta ogni tipo di elemento chimico è identificato attraverso il suo simbolo chimico. Il numero di atomi di ogni elemento presente nella molecola viene indicato con un numero subscritto se è diverso da uno, altrimenti viene omesso.Per esempio il metano, una molecola semplice che consiste in un atomo di carbonio legato a quattro atomi di idrogeno ha formula bruta
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