Question 1

Which of the following best describes a compound?

Accepted Answer

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

Question 2

Which of the following is an example of a physical change?

Accepted Answer

Melting ice into water.

Question 3

Which property is considered intensive?

Accepted Answer

Density

Question 4

A student mixes salt and water in a beaker. Which statement is true about the resulting mixture?

Accepted Answer

It is a mixture because the components can be separated physically.

Question 5

Which of the following changes results in the formation of a new substance?

Accepted Answer

Burning gasoline in a car engine

Question 6

Which statement about elements is correct?

Accepted Answer

Elements are made of only one kind of atom.

Question 7

Which of the following is NOT a pure substance?

Accepted Answer

Salt water

Question 8

A sample of gold has a mass of 50 g and a volume of 2.6 cm$$^3. $$What is its density?

Accepted Answer

$$\frac{50\ \mathrm{g}}{2.6\ \mathrm{cm}^3} = 19.2\ \mathrm{g/cm}^3$$

Question 9

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 10

Which statement best explains why density is an intensive property?

Accepted Answer

Density does not depend on the amount of substance present.

Question 11

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that can be separated by physical means.

Question 12

Which process is an example of a chemical change?

Accepted Answer

Cooking an egg

Question 13

Which of the following statements is true about mass and volume?

Accepted Answer

Both are extensive properties.

Question 14

A student observes that melting ice does not produce a new substance. This observation supports which concept?

Accepted Answer

Physical changes do not change the composition of matter.

Question 15

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

Accepted Answer

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

Question 16

Which statement correctly distinguishes between a compound and a mixture?

Accepted Answer

A compound is formed by chemical bonding, while a mixture is not.

Question 17

Which of the following is NOT a chemical change?

Accepted Answer

Boiling water

Question 18

A sample of water is heated from 25°C to 100°C. Which property of water remains unchanged?

Accepted Answer

Composition

Question 19

Which of the following best describes the atom?

Accepted Answer

The basic unit of matter.

Question 20

Which of the following is an extensive property?

Accepted Answer

Mass

Introduction to Matter and Its Properties

Study Guide - Practice Questions