The Nature of Solids Flashcard

melting point
the temperature at which a substance changes from a solid to a liquid;
a solid in which the atoms, ions, or molecules are arranged in an orderly, repeating, three-dimensional pattern called a crystal lattice
unit cell
the smallest group of particles within a crystal that retains the geometric shape of the crystal
one of two or more different molecular forms of an element in the same physical state
amorphous solid
describes a solid that lacks an ordered internal structure; denotes a random arrangement of atoms
transparent fusion of inorganic materials that have cooled to a rigid state without crystallizing
what determines the properties of solids?
arrangement of particles and their fixed locations
how are solid particles packed?
are solids easy to compress?
solid particles vibrate around what?
a fixed point
how does a solid break down into a liquid?
kinetic energy makes vibrations arond fixed points increase to the point where particles break apart
how are melting and freezing points related?
they are the same
when is a liquid/ solid in equalibrium?
at the exact melting point
what determines the melting points in crystals?
type of bond
how many groups are crystals organized into?
what does the unit cell do?
repeats throughout a crystal
how many unit cells are present in crystal systems?
up to 4
what types of unit cells make up the cubic system?
simple cubic/ body-centered/ face-centered
02 and 03 are what?
allotropes of oxygen
what is different between allotropes of the same element?
structure, which causes a change in properties
what kind of solid has randomly arranged particles?
amorphous solids
what are examples of amorphous solids?
rubber, plastic, asphalt, glass
glass is a super “what” liquid?
what does glass do when it’s heated?
gradually softens
when does glass melt?
no definite temperature

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