Question 1

Which of the following best describes a pure substance?

Accepted Answer

A substance that cannot be separated into other substances by physical means

Answer

A material that contains two or more components physically combined

Answer

A substance that can be separated by filtration or evaporation

Answer

A material composed of elements and compounds mixed together

Question 2

Which of the following is an example of a mixture?

Accepted Answer

Air

Answer

Distilled water

Answer

Oxygen gas

Answer

Table salt (NaCl)

Question 3

Which of the following statements is true about mixtures?

Accepted Answer

The components retain their individual properties.

Answer

They have a fixed composition.

Answer

They can only be separated through chemical means.

Answer

They are made up of only one kind of particle.

Question 4

Salt dissolved in water is an example of a _______.

Accepted Answer

Compound

Answer

Homogeneous mixture

Answer

Heterogeneous mixture

Answer

Element

Question 5

Which of the following is not a pure substance?

Accepted Answer

Orange juice

Answer

Carbon dioxide

Answer

Aluminum foil

Answer

Sugar

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