Química Básica Flashcards

1
Q

O que é uma substância pura?

A

É a substância que tem mesmo composto químico

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2
Q

Verdade ou falso: misturas podem ser separadas por métodos físicos?

A

Verdade

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3
Q

Uma mistura __________ tem uma composição uniforme

A

homogênea

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4
Q

O que é uma mistura heterogênea?

A

Tem fases que podem ser distinguidas

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5
Q

Que método você usaria para separar areia e sal?

A

Dissolução e depois filtração.

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6
Q

Qual a diferença de mistura e composto?

A

A mistura é uma substância combinada fisicamente
Ex: Água e sal

Composto é mais de uma substância combinada quimicamente (ex: H20)

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7
Q

destilação

A

é um tipo de separação que separa dependendo da diferença de ebulição e substâncias sólida + líquida homogênea

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8
Q

O que é filtração?

A

Usar um filtro para separar misturas sólido líquido heterogêneas

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9
Q

Multiple Choice: Which of the following is NOT a method for separating mixtures? A) Filtration B) Distillation C) Synthesis D) Chromatography

A

C) Synthesis

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10
Q

What is chromatography used for?

A

Chromatography is used to separate and analyze the components of a mixture based on their different affinities for a stationary phase and a mobile phase.

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11
Q

Fill in the blank: A __________ mixture is one where the different components can be seen and easily separated.

A

heterogeneous

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12
Q

What is the role of a solvent in the separation of mixtures?

A

The solvent dissolves one or more components of the mixture, allowing for separation through methods like filtration or evaporation.

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13
Q

True or False: Evaporation can be used to separate a soluble solid from a liquid.

A

True

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14
Q

What is the purpose of using a centrifuge in separation processes?

A

A centrifuge separates components of a mixture based on their density by spinning them at high speed.

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15
Q

Multiple Choice: Which separation method is best for separating a liquid from solid particles? A) Sieving B) Distillation C) Filtration D) Sedimentation

A

C) Filtration

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