Question 1

What is a defining characteristic of a pure substance?

Accepted Answer

It has a fixed composition and definite properties.

Answer

It can be separated into components by physical means.

Answer

It consists of visibly different parts.

Answer

It is always a liquid.

Question 2

In which type of mixture are the different components easily seen and separated?

Accepted Answer

Heterogeneous mixture

Answer

Solution

Answer

Pure substance

Answer

Homogeneous mixture

Question 3

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Sugar dissolved in water

Answer

Sand and iron filings

Answer

Granola bar

Answer

Oil and water

Question 4

Which statement best describes a solution?

Accepted Answer

A solution is a homogeneous mixture where one substance is dissolved in another.

Answer

A solution is a mixture with easily visible components.

Answer

A solution consists of two or more substances mixed but not dissolved.

Answer

A solution is a pure substance with a fixed composition.

Question 5

Which of the following is a characteristic of heterogeneous mixtures?

Accepted Answer

The components can often be seen and separated easily.

Answer

They consist of only one type of atom.

Answer

They have a uniform composition throughout.

Answer

The components are chemically bonded together.

Question 6

Which of the following describes a pure substance?

Accepted Answer

It has a uniform and definite composition.

Answer

It can be separated by physical processes.

Answer

It has visible different parts under a microscope.

Answer

It consists of multiple substances mixed together.

Question 7

What type of mixture is air classified as?

Accepted Answer

Homogeneous mixture

Answer

Heterogeneous mixture

Answer

Pure substance

Answer

Compound

Question 8

Which of the following is NOT a characteristic of homogeneous mixtures?

Accepted Answer

The components remain visibly separate.

Answer

The mixture is uniform throughout.

Answer

The composition is the same throughout the sample.

Answer

The substances are evenly distributed.

Question 9

Which of the following is an example of a pure substance?

Accepted Answer

Distilled water

Answer

Trail mix

Answer

Mud

Answer

Saltwater

Question 10

Which mixture is an example of a heterogeneous mixture?

Accepted Answer

Pizza

Answer

Saltwater

Answer

Vinegar

Answer

Tea

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