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.