TPO45L3 Homogeneous And Heterogeneous (Chemistry)

音频

题目

1.What does the professor mainly discuss?

A. Characteristics of different types of mixtures 

B. Differences between mixtures and solutions

C. Ways of separating components of mixtures

D. Identifying variable properties of solutions

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2.In the lecture, the professor gives examples of homogeneous and heterogeneous mixtures. For each mixture below, indicate which kind it is.


Homogeneous Heterogeneous
Dirty water

Salt water

Smoke

Soil

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3.What is one basis for classifying a mixture as homogeneous or heterogeneous?

A. Whether its component parts are the same type of matter

B. Whether its component parts are present in equal proportions

C. Whether it contains one phase or more than one phase

D. Whether it appears, without magnification, to contain a single component

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4.What can be inferred from the lecture about the process of distillation?

A. It cannot be used if a mixture has variable properties.

B. It can be used to separate the components of homogeneous mixtures.

C. It is used to change heterogeneous mixtures Into homogeneous mixtures.

D. It is a more efficient way of separating components of heterogeneous mixtures than filtration.

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5.Why does the professor mention the freezing point of a mixture?

A. To explain why salt dissolves in water

B. To emphasize that mixtures can exist in a frozen state

C. To show how filtration and distillation differ

D. To give an example of a variable property of mixtures

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6.What does the professor imply when he says this:

A. He wants to correct a statement he made previously.

B. He is uncertain whether the students understood his explanation. 

C. The meaning of a term should be obvious to the students.

D. The students are probably unaware that they have already seen examples of heterogeneous mixtures.


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