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Vocabulary Chapter 16
solids liquide gases
9
Science
9th Grade
10/20/2013

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Term
Kinetic Theory
Definition
An explanation of how particles in matter behave.
Term
3 Assumptions of kinetic theory
Definition

1.  All matter is composed of small particles

2.  These particles are in constant, random motion.

3.  These particles are colliding with each other and the walls of their container.

Term
Thermal Energy
Definition
The total energy of a material's particles- including kinetic (moving) and potential (stored) energies.
Term
Heat of fusion
Definition
The amount of energy needed to change a solid to a liquid.
Term
Heat of Vaporization
Definition
The amount of energy required for the liquid at its boiling point to become a gas.
Term
Diffusion
Definition
The spreading of particles throughout a room
Term
Thermal Expansion
Definition
As particles gain energy (heat up) they move faster and farther apart resulting in an increase in size of a substance.
Term
Contraction
Definition
The movements of the particles closer together resulting in an overall shrinking of the object.
Term
Amorphous Solids
Definition
Substances which have no definite melting point.  Glass and plastices are examples.  These materials have very different properties than crystalline solids.
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