Phase/State Changes
Vocabulary
Solids, Liquids & Gases
Adding or Removing Heat
Phase Change Diagram
100
A phase change from solid to liquid
melting
100
Anything that has mass and takes up space
matter
100
definite shape, definite volume
solid
100
Is energy added or removed during a phase change from solid to liquid?
added
100
The temperature at which water freezes and ice melts
0 degrees Celsius (32 degrees Fahrenheit)
200
A phase change from liquid to solid
freezing
200

When the particles of matter are heated and start to spread out they undergo

expansion

200
indefinite shape, definite volume
liquid
200
Is energy added or removed during a phase change from liquid to solid?
removed
200
The temperature at which water boils and water vapor condenses
100 degrees Celsius (212 degrees Fahrenheit)
300
A phase change from gas to liquid
condensation
300
A measure of how fast the particles in a substance are moving
temperature
300
indefinite shape, indefinite volume
gas
300
Is energy added or removed during a phase change from liquid to gas?
added
300

The horizontal line or "plateau" on a phase change diagram represents 

A phase change

400
A phase change from solid to gas, skipping over the liquid phase
sublimation
400

When the particles cool down and begin moving close together they undergo

contraction

400
A state of matter in which the particles vibrate in place
solid
400
Is energy added or removed during a phase change from gas to liquid?
removed
400

The sloped or diagonal line on a phase change diagram indicates a change in _______.

Temperature

500

A phase change from solid to gas, skipping over the liquid phase

sublimation

500
______ takes place at the surface of a liquid and ______ takes place throughout the entire liquid
evaporation (surface), boiling (throughout)
500

A state of matter in which the particles can move around freely

gas

500
Is energy added or removed during a phase change from solid to gas? Is energy added or removed during a phase change from gas to solid?
solid to gas (added), gas to solid (removed)
500

How many phase changes could be represented on a phase change diagram and what are they?

4 (melting, freezing, condensation, evaporation)

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