Ceci est une ancienne révision du document !
RAPPELS : L'air
1. Quelle est la composition de l'air ?
2. Est-ce un corps pur ou un mélange ? Justifier.
3. Quel type de mélange ? Justifier.
4. Quelle est la masse d'air dans la salle 3 ? Expliquer. Et si c'était de l'eau ?
5. Comment expliquer qu'un gaz est compressible et pas un liquide ?
6. Comment expliquer qu'un liquide prend la forme du récipient qui le contient et pas un solide ?
RAPPELS : Formules d’espèces chimiques
1. Comment appelle-t-on les particules qui constituent une molécule ?
2. Compléter le tableau ci-dessous regroupant les éléments les plus couramment rencontrés dans les espèces chimiques :
| Elément | Carbone | Hydrogène | Oxygène | Azote |
| Position dans la classification périodique | | | | |
| Symbole | | | | |
| Représentation de l’atome | | | | |
3. L’éthanol peut être utilisé comme antiseptique. La formule chimique de cette molécule est C2 H6 O.
La composition atomique d’une molécule d’éthanol est :
□ 1 atome de carbone + 2 atomes d’hydrogène + 6 atomes d’oxygène
□ 2 atomes de carbone + 6 atomes d’hydrogène
□ 2 atomes de carbone + 6 atomes d’hydrogène + 1 atome d’oxygène
□ 2 atomes de carbone + 6 atomes d’hydrogène + 6 atomes d’oxygène
4. Donner la composition de la molécule d’acide acétylsalicylique (anti-inflammatoire) sachant que sa formule est : C9 H8 O4.
5. La molécule d’acide ascorbique que l’on trouve dans la vitamine C contient 6 atomes de carbone, 8 atomes d’hydrogène et 6 atomes d’oxygène. Donner sa formule.
6. Voici la modélisation d’une molécule de protoxyde d’azote (gaz utilisé comme anestésiant en bloc opératoire) 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Donner sa formule.