Formule chimique

Formule développée plane de l'isobutane.

La formule chimique d'un composé chimique, d'une espèce chimique ou d'un minéral est une expression indiquant quels éléments, et dans quelles proportions, constituent ce composé, cette entité ou ce minéral (par exemple la formule brute de l'eau est H2O). Les formules chimiques obéissent à une certaine standardisation, afin de faciliter leur indexation et d'éviter les ambiguïtés.

Description

En fonction des informations supplémentaires que la formule peut apporter, on distingue :

Notes et références

  1. Ces formules apportent une information structurale, mais ce ne sont pas de véritables formules structurales quand pour le composé chimique et l'adduit on se contente d'une formule moléculaire.

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