CHE 104 Lecture Notes - Lecture 13: Trigonal Planar Molecular Geometry, Amorphous Solid, Network Covalent Bonding

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6 Feb 2017
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February 3rd, 2017
Dr. Townsend
Lecture #13
Types of Solids Continued...
Network
Structural Units (made out of)
Atoms are held in an infinite two dimensional or three
dimensional network
Forces Holding Units Together
Covalent bonds
Typical Properties
Wide range of hardness and melting points
Poor electric conductivity (with some exceptions
Examples
Graphite, diamond, and quartz
Graphite
Trigonal planar (3)
Soft
Can be used as pencils, as you write “sheets” come
off onto paper
Sheets are held together by covalent bonds, but not
entire structure
Diamond
Tetrahedral (4)
Everything is held together by covalent bonds
Amorphous
Structural Units (made out of)
Covalently bonded networks with no low range regularity
(not crystalline)
There are no repeating patterns like you see in crystals or
other shapes
Forces Holding Units Together
Covalent bonds
Typical Properties
Noncrystalline
Wide temperature range for melting
As you increase the temperature you will see that
more and more begins to melt
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