Examen formatif 1 Flashcards

1
Q

Comment on sépare un mélange?

A

Par des moyens physiques

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2
Q

Comment on sépare une substance pure?

A

Par des processus chimiques

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3
Q

Qu’est-ce qu’un mélange homogène?

A

Mélange qui a une constitution uniforme au niveau microscopique.

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4
Q

Qu’est-ce qu’un mélange hétérogène?

A

Mélange qui a une constitution non uniforme au niveau microscopique.

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5
Q

Nombre de phases des mélanges homogènes :

A

1 phase

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6
Q

Nombre de phases des mélanges hétérogènes :

A

2 phases ou +

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7
Q

Exemple de mélange :

A

Muffin aux bleuets

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8
Q

Exemple de substance pure :

A

Fer

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9
Q

Exemple de mélange homogène :

A

Sucre dans l’eau

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10
Q

Exemple de mélange hétérogène :

A

Sable dans l’eau

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11
Q

Covalente polaire :

A

Entre 0,4 et 1,7

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12
Q

Covalente non polaire :

A

Entre 0 et 0,4

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13
Q

Ionique :

A

1,7 et +

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14
Q

Comment séparer un mélange hétérogène?

A

Filtration
Triage magnétique
Décantation
Sédimentation

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15
Q

Comment séparer un mélange homogène?

A

Distillation

Chromatographie

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