Question 1

Which of the following best describes a compound?
Correct answer: A pure substance composed of two or more different elements bonded together

Accepted Answer

A pure substance composed of two or more different elements bonded together

Question 2

A student mixes sand and iron filings together. Which statement best describes the result?
Correct answer: A mixture is formed that can be separated physically

Accepted Answer

A mixture is formed that can be separated physically

Question 3

Which of the following is an example of a chemical change?
Correct answer: Burning a piece of paper

Accepted Answer

Burning a piece of paper

Question 4

Which property is intensive and does NOT depend on the amount of substance present?
Correct answer: Density

Accepted Answer

Density

Question 5

A sample of water is heated from 20°C to 100°C and boils. Which of the following best describes the process?
Correct answer: A physical change, because the composition of water remains the same

Accepted Answer

A physical change, because the composition of water remains the same

Question 6

Which scenario best illustrates the difference between a mixture and a compound?
Correct answer: Combining hydrogen and oxygen to form water

Accepted Answer

Combining hydrogen and oxygen to form water

Question 7

A chemist is given a clear, colorless liquid. Which test would best determine if it is a pure substance or a mixture?
Correct answer: Testing if it can be separated into different components by physical means

Accepted Answer

Testing if it can be separated into different components by physical means

Question 8

Which of the following statements about atoms is correct?
Correct answer: Atoms are the fundamental unit of matter

Accepted Answer

Atoms are the fundamental unit of matter

Question 9

A gold bar is cut in half. Which property remains unchanged?
Correct answer: Density

Accepted Answer

Density

Question 10

Which of the following is NOT a pure substance?
Correct answer: Air

Accepted Answer

Air

Question 11

A student observes that when vinegar is mixed with baking soda, bubbles form and a new substance is produced. What type of change is this?
Correct answer: Chemical change, because a new substance is produced

Accepted Answer

Chemical change, because a new substance is produced

Question 12

Which of the following best explains why salt water is considered a mixture?
Correct answer: It can be separated into its components by physical means

Accepted Answer

It can be separated into its components by physical means

Question 13

Which of the following is an example of an extensive property?
Correct answer: Mass

Accepted Answer

Mass

Question 14

A patient is given a saline solution intravenously. Why is it important that the solution is a mixture and not a pure substance?
Correct answer: A mixture allows for the combination of water and salt, which is necessary for the body

Accepted Answer

A mixture allows for the combination of water and salt, which is necessary for the body

Question 15

Which of the following best distinguishes a physical change from a chemical change?
Correct answer: A physical change does not alter the composition of the substance

Accepted Answer

A physical change does not alter the composition of the substance

Question 16

Which of the following is an example of a pure substance that is an element?
Correct answer: Copper wire

Accepted Answer

Copper wire

Question 17

A student claims that dissolving table salt in water is a chemical change. Which argument best refutes this claim?
Correct answer: The salt and water can be separated by evaporation, indicating a physical change

Accepted Answer

The salt and water can be separated by evaporation, indicating a physical change

Question 18

Which of the following best describes the composition of a mixture?
Correct answer: It can vary in composition

Accepted Answer

It can vary in composition

Question 19

Which of the following scenarios involves a change in an intensive property?
Correct answer: Heating a metal rod and observing its density decrease

Accepted Answer

Heating a metal rod and observing its density decrease

Question 20

Which of the following best explains why burning wood is considered a chemical change?
Correct answer: New substances such as ash, carbon dioxide, and water vapor are formed

Accepted Answer

New substances such as ash, carbon dioxide, and water vapor are formed

Classification of Matter in Chemistry

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