Changes in State Lesson

Changing States of Matter

IN YOUR SCIENCE NOTEBOOK TAKE NOTES OF THE FOLLOWING

MELTING

:Solid becomes liquid.

–Energy is added

-Particles speed up.

-Temperature rises

Melting point: Temperature at which a substance changes from a solid to a liquid.

EVAPORATION

–Add heat to a liquid

•Atoms gain energy.

•Move faster

–Evaporation

•Particles can escape from the surface of a liquid if enough heat is added.

DEPOSITION

–Change in state from a gas directly to a solid.

•Substance cools.

•Atoms lose energy

•No liquid forms in the process.

•Example:

–Water vapor turns into ice crystals.

SUBLIMATION

–Change in state from a solid directly into a gas. (skips liquid phase)

•Add heat

•Atoms gain energy

•Escape into the air as a gas.

•Example: Dry Ice

VAPORIZATION

–Process by which liquids or solids change to a gas.

FREEZING

–Liquid becomes solid.

–Loss of energy.

•Particles slow down

•Temperature cools

–Freezing point

•Temperature at which a substance changes into a solid.

•Water = 0C or 32F

CONDENSATION

–The change in state from a gas to a liquid.

•Cooling a gas

•Particles lose energy.

BOILING

–A rapid change from a liquid to a gas (vapor)

–Boiling Point

•The temperature at which this occurs in a liquid.

–100°C

–212°F

Multiple Choice

Boiling is ...

• liquid to gas

• gas to solid

• gas to liquid

• solid to liquid

Multiple Choice

change from liquid to gas is called....

• expansion

• evaporation

• condensation

• sublimation

Multiple Choice

Change from Gas to Solid is called........

• Sublimation

• Deposition

• Fusion

• condensation

Multiple Choice

5. What is it called when a solid turns directly into a gas?

• Sublimation

• Condensation

• Liquid

Multiple Choice

The phase change from water vapor to liquid water is known as...

• evaporation
• precipitation
• condensation
• sublimation

Multiple Choice

What is the term given to the temperature at which a solid turns into a liquid?

• Boiling point

• Melting point

• Freezing point

• Heating point

Multiple Choice

What is it called when a solid turns directly into a gas?

• Sublimiation

• Vaporization

• Melting

• Fusion

Multiple Choice

Compared to ice, how do molecules of water behave?

• They move less freely.

• They are locked into a crystal lattice.

• They move more freely

• They bounce off one another randomly.

Multiple Choice

When a substance is heated, particles will

• Move further apart

• Get larger

• Move closer together

• Be unaffected