physical science demonstration lesson on nature of matter
TRANSCRIPT
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Ionic solids-- These substances have a definite melting point and contain ionic bonds. An example would be sodium chloride (NaCl).
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Covalent solids -- These substance appear as a single giant molecule made up of an almost endless number of covalent bonds. An example would be graphite.
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Molecular solids are represented as repeating units made up of molecules. An example would be ice.
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Metallic solids are repeating units made up of metal atoms. The valence electrons in metals are able to jump from atom to atom.
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Amorphous solids Amorphous solids do not have a definite
melting point or regular repeating units. An amorphous solid is a solid in which there is no long-range order of the positions of the atoms unlike those in crystalline solids. An example of an amorphous solid is window glass. In addition many polymers such as polystyrene are amorphous. Amorphous solids can exist in two distinct states, the 'rubbery' state and the 'glassy' state. The temperature at which they transition between the glassy and rubbery states is called their glass transition temperature or Tg.
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