Question 1

Which of the following best describes a chemical change?

Accepted Answer

Burning wood to produce ash and gases

Question 2

Which statement correctly distinguishes between elements and compounds?

Accepted Answer

Elements consist of only one kind of atom, while compounds consist of two or more different elements bonded together.

Question 3

A student mixes sand and salt water together. Which type of matter is formed?

Accepted Answer

Mixture

Question 4

Which property is intensive and does NOT depend on the amount of substance present?

Accepted Answer

Density

Question 5

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 6

Which of the following is a pure substance?

Accepted Answer

Oxygen gas ($$\mathrm{O_2$})$$

Question 7

Which property would change if you cut a block of copper in half?

Accepted Answer

Mass

Question 8

Which of the following is NOT a chemical change?

Accepted Answer

Evaporating alcohol

Question 9

A mixture of iron filings and sulfur can be separated by using a magnet. What does this indicate about the mixture?

Accepted Answer

It is a mixture.

Question 10

Which of the following best describes the difference between mass and volume?

Accepted Answer

Both mass and volume are extensive properties.

Question 11

Which of the following is an example of a compound?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 12

Which process would NOT result in a change in chemical composition?

Accepted Answer

Boiling water

Question 13

A sample of seawater is analyzed and found to contain dissolved salts, water, and microscopic organisms. Which classification best fits seawater?

Accepted Answer

Mixture

Question 14

Which statement about mixtures is correct?

Accepted Answer

Mixtures can be separated by physical means.

Question 15

Which of the following is an extensive property?

Accepted Answer

Mass

Question 16

Which of the following best explains why density is an intensive property?

Accepted Answer

Density is the ratio of mass to volume, and does not change when the sample size changes.

Question 17

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 18

A student observes that when magnesium metal is heated, it reacts with oxygen to form a white powder. What type of change has occurred?

Accepted Answer

Chemical change

Question 19

Which of the following statements is true about compounds?

Accepted Answer

Compounds are made of two or more different elements bonded together.

Question 20

Which of the following is NOT a pure substance?

Accepted Answer

Air

Introduction to Matter and Its Properties

Study Guide - Practice Questions