Matter- Changes of State

Multiple Choice

What is the main cause of any change of state?

• Gaining thermal energy

• Thermal energy stays the same

• Gaining or losing thermal energy

• Losing thermal energy

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Match

Match the term with the their proper definition

• Solid

• Liquid

• Gas

Fixed shape and volume.

No fixed shape but a fixed volume.

No fixed shape or size

• Fixed shape and volume.

• No fixed shape but a fixed volume.

• No fixed shape or size

Multiple Choice

Which property is true of a crystalline solid?

• Its particles have a regular, repeated pattern.

• Its particles have no pattern.

• Its particles are spread out and can flow past each other.

• Its particles are so far apart, they can spread in a container.

Reorder

Water can occur as liquid water, water vapor, or ice. The water molecules move at different speeds when they are in each state. Reorder them from fastest to slowest.

• water vapor

• liquid water

• ice

1

2

3

• 1
• 2
• 3

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Melting: Solid to Liquid

•

add heat energy to
sold

•

• melting point- temp.

of change from a
solid to a liquid

• Item

• Item

• Item

Multiple Choice

For a solid to change to a liquid, heat must be __________ .

• Added

• Removed

Multiple Choice

What is the melting point of water?

• 212°C
• 100°C
• 32°C
• 0°C

Multiple Choice

Which number is melting?

• 8

• 9

• 10

• 11

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Evaporation
• Evaporation is the change of

state from a liquid to a gas.

•

Match

Match the arrangement to the state of matter

Solid

Gas

Liquid

Plasma

• Solid

• Gas

• Liquid

• Plasma

Multiple Choice

A change of state from a liquid to gas is called....

• Melting
• Freezing
• Evaporation

Multiple Choice

When you add or remove heat to an object, you are adding or removing _________.

• Mass

• Energy

• Volume

• Matter

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Freezing: Liquid to Solid

• the change of state
From a liquid to a solid.

• Freezing point- temperature at which
• a liquid changes into a solid

• For a liquid to freeze, energy must be

removed from the liquid to slow the
movement of the particles.

Multiple Choice

If you have a sample of water that is 44 °C, what state is it in?

• solid

• liquid

• gas

Multiple Choice

Taking energy away from a substance will make its particles move

• more slowly
• more quickly
• at the same speed

Multiple Choice

Which of the following describes the process of freezing?

• Freezing occurs when the temperature of a substance drops to zero degrees Celsius.
• Freezing occurs when the particles of a solid vibrate so fast that they break free.
• Freezing occurs when the temperature drops enough that a gas turns into a solid.
• Freezing occurs when the particles in a liquid slow down and take fixed positions.

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Boiling

change of a liquid to a vapor, or gas.
Boiling point - temperature at which this
change happens

Water boils
more easily
if the atmospheric
pressure is lower.

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Boiling
Point

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Condensation: Gas to Liquid

energy must be removed to slow the

movement of the particles.

• Condensation and evap. are reverse of each

other.

• condensation point- temp. when gas becomes

liquid.

•

Multiple Choice

Which number is condensation?

• 8

• 9

• 10

• 11

Multiple Choice

A change of state from a liquid to a solid is called....

• Melting
• Freezing
• Evaporation

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Sublimation: Solid directly to Gas

particles must go from being very tightly packed to
being spread far apart.

solid must gain energy for particles to overcome their
attractions.

Multiple Choice

Dry ice is an example of what phase change.

• freezing

• melting

• vaporization/boiling

• sublimation

Multiple Choice

Do particles (or the atoms) in a substance ever stop moving?!

• No

• Yes

Multiple Choice

When a substance changes from a liquid to a solid, this is called...

• Melting

• Evaporation

• Condensation

• Freezing

Multiple Choice

When surface particles of a solid gain enough energy that they form a gas.

• melting point

• evaporation

• condensation

• sublimation

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Sublimation- Other Examples

Mothball- Napthalene and
camphor - (Vick's vap-o-rub

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Temperature and Changes of State

• When a substance is undergoing a

change of state, its temperature
does not change until the change of
state is complete.

• E.g. the temp of a water won’t rise

above zero C until all the ice is
melted.

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Multiple Choice

Condensation happens when a gas gets...

• hotter

• cooler

Multiple Choice

On a hot, humid summer day drops of water form on a can of cold soda. What process caused this to happen?

• condensation

• freezing

• vaporization

• deposition

Multiple Choice

Vaporization that tales place only on the surface of a liquid is called?

• evaporation

• vaporization

• condensation

• boiling

Multiple Choice

At which number is condensation happening?

• 8

• 9

• 10

• 11

Multiple Choice

What phase of matter exists in part C of the graph?

• Gas

• Liquid

• Solid

• Plasma

Multiple Choice

What phase of matter exists in part D of the graph?

• Gas

• Liquid

• Solid

• Plasma

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Specific Heat

the amount of energy required to raise the
temperature of 1 gram of a substance by 1 °
C.

different substances have diff. specific heats
b/c size, mass, attractions, and
arrangements of their atoms or molecules
are different.

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Multiple Choice

Which has a higher specific heat: water or metal?

• air

• metal

• water

• wood

Multiple Choice

The unit for specific heat is

• J

• J/gC

• g

• $$\degree C$$

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Changes of state- summary

• change of state

• a physical change
• No chemical reaction.

• Changes of state

• melting, freezing, evaporation,

condensation, and sublimation

• All change of state involves gain or loss of

energy

• Reversible