23 terms

States of Matter and Phase Changes

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States of matter
The physical forms of matter, which include solid, liquid, and gas
physical property
A characteristic of a pure substance that can be observed without changing it into another substance
Solids
A state of matter with a definite volume and definite shape. Molecules are low energy and are close together in a regular pattern, and vibrate around fixed positions.
Liquids
A state of matter with a definite volume, but no definite shape. Molecules have medium energy and are able to slide past each other.
Gases
A state of matter where the particles have no fixed shape or volume. They will fill the entirety of the space they're in.
deposition
Change from a gas directly to a solid
dry ice
Solid carbon dioxide
Examples of deposition in nature
frost forming on the ground and cirrus clouds forming high in the atmosphere
sublimination
Change from a solid directly to a gas
Examples of sublimination
dry ice and moth balls
melting point
The temperature at which a substance changes from a solid to a liquid.
melting
The process in which rocks or other solids change to liquids
freezing
The process in which water or any other liquid changes to a solid
freezing point
The temperature at which a substance freezes
condensation
Change in state from a gas to a liquid
dew point
The temperature at which condensation begins
boiling point
The temperature at which a liquid changes to a gas
evaporation
The change of state from a liquid to a gas
The boiling point of pure water
100*C
The freezing point of pure water
0*C
amorphous solids
Solids whose particles are not arranged in a regular pattern
crystalline solid
A solid that is made up of crystals in which particles are arranged in a regular, repeating pattern
kinetic theory of matter
the idea that all matter is made up of tiny particles in constant motion