Unit 1 Lesson 6

Question 1

What happens when matter changes state?

Answer 1

Energy is gained and lost

The motion of the particles change

The total amount of energy is conserved

Question 2

Freezing

Freezing point

Answer 2

When a liquid becomes a solid

The temperature at which a liquid changes into a solid

Question 3

Melting

Melting point

Answer 3

Change of state from solid to a liquid

The temperature at which a solid changes from a solid to a liquid

Question 4

Evaporation

Boiling

Boiling point

Answer 4

Change from a liquid to a gas ( at the surface)

Rapid change from a liquid to a gas ( throughout the liquid)

The temperature at which a liquid starts to bubble or boil.
(THE GREATER THE AIR PRESSURE, THE HIGHER THE BOILING POINT OF A LIQUID)

Question 5

Condensation

Answer 5

Change of state from a gas to a liquid

Question 6

Sublimation

Deposition

Answer 6

Change from a solid directly to a gas
Example: dry ice which is frozen carbon dioxide
When solid iodine is heated, it becomes a purple gas

Change from a gas directly to a solid
Example: water vapor to ice crystals

Question 7

What happens to matter when a change of state occurs?

Answer 7

The energy of the particles changes
The movement of the particles changes
The distance between the particles changes

***The mass does not change