Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

Which separation technique would be most appropriate to separate a mixture of sand and water?

Accepted Answer

Filtration

Question 3

A sample of brass is best classified as which type of matter?

Accepted Answer

Homogeneous mixture

Question 4

Which of the following is a heterogeneous mixture?

Accepted Answer

Water and copper metal

Question 5

Which statement correctly distinguishes between pure substances and mixtures?

Accepted Answer

Pure substances have a fixed composition; mixtures have a variable composition.

Question 6

Which of the following is an example of a compound?

Accepted Answer

Sodium chloride (NaCl)

Question 7

A scuba tank contains a mixture of oxygen and nitrogen gases. This mixture is best described as:

Accepted Answer

A homogeneous mixture

Question 8

Which of the following can be separated into its components by physical means?

Accepted Answer

Brass (copper and zinc)

Question 9

Which of the following is NOT a pure substance?

Accepted Answer

Pasta and tomato sauce

Question 10

Which of the following best describes the composition of a homogeneous mixture?

Accepted Answer

The composition is uniform throughout the sample.

Question 11

A student is given a sample of sugar water. Which classification best fits this sample?

Accepted Answer

Homogeneous mixture

Question 12

Which of the following is a correct example of a physical method of separation?

Accepted Answer

Filtration of sand from water

Question 13

Which of the following statements about elements is true?

Accepted Answer

Elements are pure substances composed of only one type of atom.

Question 14

Which of the following is a correct classification for peach pie?

Accepted Answer

Heterogeneous mixture

Question 15

A mixture of oxygen, helium, and nitrogen gases used in scuba tanks is best described as:

Accepted Answer

A homogeneous mixture

Question 16

Which of the following is a chemical method of separation?

Accepted Answer

Decomposition of sodium chloride ($$NaCl) $$into sodium and chlorine

Question 17

Which of the following is true about compounds?

Accepted Answer

Compounds have a fixed ratio of elements.

Question 18

Which of the following is an example of a homogeneous mixture used in everyday life?

Accepted Answer

Soapy shampoo

Question 19

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound has a fixed composition, while a mixture has a variable composition.

Question 20

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

Accepted Answer

Aluminum foil

Matter and Its Classification: Pure Substances and Mixtures

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