Chapter 1

Question 1

Molecules can be described as

Answer 1

two or more atoms chemically joined together.

Question 2

A scientific theory

Answer 2

is based on continued observation and experiment

Question 3

Identify a liquid

Answer 3

definite volume and no definite shape

Question 4

Which of the following statements about crystalline and amorphous solids is TRUE?

Answer 4

A crystalline solid is composed of atoms or molecules arranged with long-range repeating
order.

Question 5

Which of the following statements about the phases of matter is TRUE?

Answer 5

In both solids and liquids, the atoms or molecules pack closely to one another

Question 6

A substance that can’t be chemically broken down into simpler substances is

Answer 6

an element

Question 7

A substance composed of two or more elements in a fixed, definite proportion is

Answer 7

a compound

Question 8

Two or more substances in variable proportions, where the composition is constant throughout are

Answer 8

a homogeneous mixture

Question 9

Two or more substances in variable proportions, where the composition is variable throughout are

Answer 9

a heterogeneous mixture

Question 10

A physical change

Answer 10

occurs when water is evaporated.

Question 11

A chemical change

Answer 11

occurs when methane gas is burned

Question 12

Which of the following statements about energy is FALSE?

Answer 12

Kinetic energy is the energy associated with its position or composition

Question 13

Define thermal energy

Answer 13

energy associated with the temperature of an object

Question 14

Define kinetic energy

Answer 14

energy associated with the motion of an object

Question 15

Define potential energy

Answer 15

energy associated with the position or composition of an object

Question 16

The outside temperature is 35°C. What is the temperature in K?

Answer 16

308 K

Question 17

Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water when placed in a graduated cylinder

Answer 17

12.4 g/mL

Question 18

Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g/cm3

Answer 18

23.6 mL

Question 19

Which of the following statements about the phases of matter is TRUE?

Answer 19

In both solids and liquids, the atoms or molecules pack closely to one another

Question 20

A substance that can’t be chemically broken down into simpler substances is

Answer 20

an element

Question 21

A substance composed of two or more elements in a fixed, definite proportion is

Answer 21

a compound

Question 22

Identify a solid

Answer 22

definite volume and definite shape

Question 23

Identify a gas

Answer 23

no definite shape and no definite volume

Question 24

The statement, “In a chemical reaction, matter is neither created nor destroyed” is called

Answer 24

the Law of Conservation of Mass

Question 25

What answer should be reported, with the correct number of significant figures, for the following calculation? (433.621 - 333.9) × 11.900

Answer 25

1.19 × 10^3

Question 26

What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362 + 41) / 63.498

Answer 26

4.57

Question 27

What answer should be reported, with the correct number of significant figures, for the following calculation? (965.43 × 3.911) + 9413.4136

Answer 27

13189