Question 1

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

Accepted Answer

Brass (an alloy of copper and zinc)

Question 2

Which statement best describes a compound?

Accepted Answer

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

Question 3

Which of the following is NOT a physical property?

Accepted Answer

Ability to react with acid

Question 4

A student separates a mixture of sand and salt by adding water, stirring, filtering, and then evaporating the water from the filtrate. Which property is primarily used to separate the salt from the sand?

Accepted Answer

Solubility

Question 5

Which of the following best describes the particles in a solid?

Accepted Answer

They move slowly and are arranged in a rigid pattern

Question 6

Which of the following is a pure substance?

Accepted Answer

Table salt (NaCl)

Question 7

A scuba tank is filled with a mixture of oxygen and nitrogen gases. This mixture is best classified as:

Accepted Answer

A homogeneous mixture

Question 8

Which of the following statements about elements is correct?

Accepted Answer

Elements are pure substances that contain only one type of atom

Question 9

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

Accepted Answer

A mixture of oil and water

Question 10

Which method would best separate a mixture of a liquid and an insoluble solid?

Accepted Answer

Filtration

Question 11

Which of the following is true about liquids?

Accepted Answer

They have an indefinite shape but a definite volume

Question 12

Which of the following best describes a physical change?

Accepted Answer

Melting of ice

Question 13

A sample of copper is described as reddish-orange, shiny, and an excellent conductor of electricity. These are examples of:

Accepted Answer

Physical properties

Question 14

Which of the following is a correct statement about gases?

Accepted Answer

They have an indefinite shape and volume

Question 15

Which of the following is a mixture?

Accepted Answer

Air

Question 16

Which of the following best explains why table salt ($$\mathrm{NaCl}) is $$considered a compound?

Accepted Answer

It is composed of sodium and chlorine atoms chemically combined in a fixed ratio

Question 17

A student is given a clear, colorless liquid. Which test would best determine if it is a pure substance or a mixture?

Accepted Answer

Testing if it can be separated by physical means

Question 18

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

Accepted Answer

Filtration of sand from water

Question 19

Which of the following statements about mixtures is correct?

Accepted Answer

Mixtures can have variable composition and can be separated by physical methods

Question 20

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

Accepted Answer

Homogeneous mixtures have uniform composition throughout; heterogeneous mixtures do not

Classification of Matter and States of Matter: Foundations of Chemistry (Chapter 3)

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