Chapter 8

Question 1

plasma

Answer 1

gas like mixture of positively and negatively charged particles

Question 2

boyles law

Answer 2

law of which states that if the volume of a container of gas is decreased, the pressure of the gas will increase provided the temperature does not change

Question 3

Archimedes principle

Answer 3

buoyant force on an object in a fluid is equal to the weight of the fluid displaced by the object

Question 4

heat of vaporization

Answer 4

the amount of energy needed to change a material from a liquid to a gas

Question 5

evaporation

Answer 5

changing of a liquid to a gas gradually at temperatures below the boiling point

Question 6

crystals

Answer 6

repeating geometric arrangement of the particles

Question 7

states of matter

Answer 7

solid liquid gas and plasma

Question 8

pascal

Answer 8

SI unit of pressure

Question 9

Bernoulli’s Principle

Answer 9

pressure exerted by a fluid decreases as the velocity of the fluid increases

Question 10

liquid

Answer 10

water at 25° Celsius

Question 11

thermal expansion

Answer 11

matter expanding as it gets hotter and contracting when cool

Question 12

pascals principle

Answer 12

pressure applied to a fluid is transmitted unchanged throughout the fluid

Question 13

pressure

Answer 13

amount of force exerted per unit of area

Question 14

heat of fusion

Answer 14

amount of energy it takes to change a solid to a liquid

Question 15

kinetic theory of matter

Answer 15

idea that matter is made up of tiny particles that are in constant motion

Question 16

buoyant force

Answer 16

determines whether an object sinks or floats

Question 17

condensation

Answer 17

changing of a gas to a liquid

Question 18

solid

Answer 18

physical state of ice

Question 19

Charles’s law

Answer 19

the volume of a gas increases with increasing temperature providing the pressure does not change

Question 20

Boyle’s Law

Answer 20

if the volume of a container of gas is decreased, the pressure on the gas will increase if the temperature does not change

Question 21

Bernoulli’s principle

Answer 21

as the velocity of a fluid increases, the pressure exerted by the fluid decreases

Question 22

pascal’s principle

Answer 22

pressure applied to a fluid is transmitted unchanged throughout the fluid

Question 23

kinetic theory of matter

Answer 23

all matter is made of small particles that are in motion

Question 24

charles’s law

Answer 24

the volume of a gas increases with increasing temperature provided the pressure does not change

Question 25

Archimedes principle

Answer 25

the buoyant force on an object in a fluid is equal to the weight of the fluid the object displaces

Question 26

three ways you use fresh water

Answer 26

drinking, bathing, flushing toilet

Question 27

three substances polluting fresh water supplies

Answer 27

fertilizers, feces, oil, trash

Question 28

what can you do to reduce water pollution

Answer 28

create less waste, lower fresh water use

Question 29

how are scientists dealing with water pollution

Answer 29

disposing of industrial and farming by products, laws determining release of and levels of various materials in water supplies

Question 30

polluted

Answer 30

water that contains high levels of unwanted materials that makes it unacceptable for drinking