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Chem test 11/15/16 edited
Terms in this set (39)
The change in state from a solid to a liquid?
In most pure substances melting occurs at a specific temperature called?
The melting point
The change from a liquid to solid?
True or False? At it's freezing point, the particles of a solid are vibrating so fast that they break free from their fixed positions.
The change from a liquid to a gas?
When does vaporization take place?
When the particles in a liquid gain enough energy to form a gas
Vaporization includes________ and _________
evaporation and boiling
Where does boiling occur in a substance
throughout the liquid
Evaporation occurs where?
on surface of the liquid
Each liquid boils only at a certain temperature, which is called...?
Why is the boiling point of water lower in the mountains than it is at sea level?
The lower the pressure, the less energy needed for the particles of the liquid to escape into the air
True or False? Condensation is the opposite of vaporization.
When condensation occurs, does a gas lose or gain thermal energy?
the gas loses thermal energy
example of vaporization:
Liquid water turns into water vapor
example of evaporation:
a puddle dries up after a rain shower
example of boiling:
a pot of water on a stove reaches its boiling point
clouds form from water vapor in the sky
solid to gas is...?
example of sublimation
dry ice, and snow makes air colder
the change in state from a gas to a liquid?
what is gained when changes of state occur?
how does heat move from a solid to a liquid?
heat goes into a solid as it melts
how does heat move from a liquid to solid?
heat leaves the liquid as it freezes
how does heat move from a liquid to gas?
heat goes into the liquid as it evaporates
how does heat move from a gas to liquid?
heat leaves the gas as it condenses
how does heat move from a solid to gas?
heat goes into the solid as it sublimates
Describe a solids shape, volume, particles placement, and particles movement.
Definite shape and definite volume, Particles packed very close together, Particles have very slight and rapid vibrating motion
what is a fluid
a substance that flows (liquid/gas)
Describe a fluid/liquids shape, volume, particles placement, and particles movement.
Definite volume but no definite shape
Particles are packed close to one another
Particles can move around one another freely
Result of inward pull among molecules of a liquid that brings the molecules on the surface closer together
Describe a gases shape, volume, particles placement, and particles movement
No definite shape or volume
Particles move freely throughout the space available
what material is the best conductor and why?
metal, free electrons transfer heat everywhere instantly
The direct transfer of heat from one substance to another substance that it is touching
Each addition in energy creates what?
a change in state
B. Solid and Liquid
D. Liquid and Gas
Energy moves ______ to ________.
Hot to cold
You can't add _______ you just remove ________.
"cold", heat energy
the energy of a moving object is called
0 degrees can be...?
melting or freezing, depends on whether energy is being taken away or being given
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