CHEM: Lesson 8

• It can be categorized into two groups: crystalline solids and amorphous solids. 

• Solid

• Crystal Solid

• X-ray Diffraction

• Phase Changes

• Solids can be categorized into two groups: crystalline solids and amorphous solids. The differences in properties of these two groups of solids arise from the presence or absence of long-range order of arrangements of the particles in the solid.

• True

• False

They can form a regular repeating three-dimensional structure called a crystal lattice.

• Crystalline Solids

• Amorphous Solids

They can aggregate with no particular long-range order.

• Crystalline Solids

• Amorphous Solids

From the Greek ámorphos, meaning “shapeless”

• Crystalline Solids

• Amorphous Solids

• Are arranged in fixed geometric patterns or lattices, they are characterized by a regular repeating structure called the crystal lattice. 

• Crystalline Solids

• Amorphous Solids

• Examples are ice and sodium chloride (NaCl), copper sulfate (CuSO4), diamond, graphite, and sugar (C12H22O11). The ordered arrangement of their units maximizes the space they occupy and are essentially incompressible.

• Crystalline Solids

• Amorphous Solids

• It have random orientation of particles. 

• Crystalline Solids

• Amorphous Solids

• They are considered supercooled liquids where molecules are arranged in a random manner similar to the liquid state.

• Crystalline Solids

• Amorphous Solids

• Examples are glass, plastic, coal, and rubber.

• Crystalline Solids

• Amorphous Solids