Question 1

Which of the following best describes a compound?

Accepted Answer

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

Question 2

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

Accepted Answer

Brass (an alloy of copper and zinc)

Question 3

Which process can be used to separate a mixture but not a compound?

Accepted Answer

Filtration

Question 4

A student has a sample of table salt (NaCl). Which statement is correct about this sample?

Accepted Answer

It is a compound composed of sodium and chlorine in a fixed ratio.

Question 5

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 6

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

Accepted Answer

The composition varies from one part of the mixture to another.

Question 7

Which of the following is an example of a compound?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 8

A student mixes sand and salt together. Which type of matter is this mixture?

Accepted Answer

Heterogeneous mixture

Question 9

Which of the following statements about elements is correct?

Accepted Answer

Elements are substances that contain only one type of atom.

Question 10

Which of the following is a correct example of a physical method used to separate mixtures?

Accepted Answer

Filtration of sand from water

Question 11

A bottle contains only $$\mathrm{H_2O}$$ molecules. Which classification best fits the contents of the bottle?

Accepted Answer

Compound

Question 12

Which of the following best describes air?

Accepted Answer

A homogeneous mixture

Question 13

Which of the following is a correct statement about compounds?

Accepted Answer

Compounds are composed of two or more elements chemically combined in a fixed ratio.

Question 14

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

Accepted Answer

Oil and water

Question 15

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

Accepted Answer

A mixture can be separated by physical methods, while a compound can only be separated by chemical methods.

Question 16

Which of the following is a pure substance?

Accepted Answer

Aluminum foil

Question 17

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

Accepted Answer

Composition varies from one part to another

Question 18

Which of the following is an example of an element?

Accepted Answer

Carbon

Question 19

Which of the following best describes the process shown in the image where a liquid is poured through a filter?

Accepted Answer

A physical separation of a heterogeneous mixture

Question 20

Which of the following is a correct classification for table sugar ($$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$)?

Accepted Answer

Compound

Matter and Energy: Classification of Matter

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