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Chimie organique - Biochimie

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10 questions

Jul 9, 2025

Question Types:

Short Answer

Question 1

Qu'est-ce que l'angle a dans le contexte du pouvoir rotatoire?

Answer

L'angle a est appelé pouvoir rotatoire de la solution.

Question 2

Quels facteurs influencent le pouvoir rotatoire?

Answer

L'épaisseur I de la solution, la concentration c de la solution, et un coefficient nommé pouvoir rotatoire spécifique [a].

Question 3

Quelle est la formule du pouvoir rotatoire?

Answer

α=[a].l.c

Question 4

Quelles sont les unités pour I, c et a?

Answer

I en m, c en mol.m³, a en degrés (°).

Question 5

Comment se manifeste la déviation du plan de polarisation de la lumière pour une substance dextrogyre?

Answer

Elle dévie à droite.

Question 6

Comment se manifeste la déviation pour une substance lévogyre?

Answer

Elle dévie à gauche.

Question 7

Qu'est-ce qu'un mélange racémique?

Answer

Un mélange racémique est inactif sur la lumière polarisée (a =0).

Question 8

Quelle est la relation entre D et L glycéraldéhyde?

Answer

Ils ont la même formule brute mais pas la même formule développée.

Question 9

Quel est le pouvoir rotatoire d'un mélange de substances?

Answer

C'est la somme des pouvoirs rotatoires de chaque substance.

Question 10

Quelle confusion est mise en garde dans le texte?

Answer

Ne pas confondre la série D avec dextrogyre et la série L avec lévogyre.

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