Solids and the Kinetic Molecular Theory
Dominated by. . .◦ Closely packed
particles◦ Relatively fixed
position◦ Highest
intramolecular attractions
Are. . .◦ Definite shape and
volume◦ Definite melting
point◦ High density ◦ Incompressible◦ Low rate of diffusion
Properties
Structure
Can be crystalline Can be amorphous
Insulin crystals Obsidian
Crystals Have a regular repeating
pattern of particles
Ionic crystals◦ Made of ions – hard and brittle◦ Ex. NaCl
Metallic crystals◦ Made of metals with free moving electrons
Covalent crystals◦ Made of molecules◦ Ex. Quartz (SiO2), water, sugar
Atomic Crystals◦ Made of atoms of one element◦ Ex. Diamond or graphite
Classes of Crystalline Solids
No regular pattern in the particles, without a particular shape
Ex. Glass, plastics, wax, cotton candy
Amorphous Solids
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