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Classify the following as amorphous or crystalline solids: Polyurethane, Naphthalene, Benzoic acid, Teflon, Potassium nitrate, Cellophane, Polyvinyl Chloride, Fiberglass, and Copper.
By BYJU'S Exam Prep
Updated on: September 25th, 2023
Amorphous solids are Polyurethane, Cellophane, Polyvinyl Chloride, Fiberglass, and Teflon and crystalline solids are Naphthalene, Benzoic acid, Potassium nitrate, and Copper. Amorphous solids are those having irregular solid geometry. Crystalline solids are those having regular solid geometry.
Amorphous solids:
- Amorphous solids are those whose geometry is referred regarded as being asymmetrical.
- The knife cuts through the amorphous solids without leaving a smooth surface.
- Pseudosolids or supercooled liquids are other names for amorphous solids.
Crystalline solids:
- Solids that are believed to have regular geometry are known as crystalline solids.
- A clean surface is produced when the crystalline solids are sliced with a knife.
- True solids are another name for crystalline solids.
Classification of the chemicals as crystalline or amorphous solids
- Polyurethane, Cellophane, Polyvinyl Chloride, Fiberglass, and Teflon are amorphous solids.
- Crystalline solids include copper, potassium nitrate, benzoic acid, and naphthalene.
As a result, the compounds listed above have been classified as crystalline or amorphous solids.
Key features of crystalline and amorphous solids –
- Nature:
True Solids – Crystalline Solids
Pseudo-solids or supercooled liquids that are amorphous
- Geometry:
Particles are grouped in a repeating pattern in crystalline solids. They are arranged in an orderly and regular manner, giving them a distinct shape.
Amorphous Solids: Randomly ordered particles. They are not arranged in an orderly fashion, resulting in their uneven shapes.
- Melting Points:
Crystalline Solids: Their melting point is extremely high.
Solids that are amorphous in nature lack distinct melting points. Across a temperature range, the solid has a tendency to gradually soften.
Summary:
Classify the following as amorphous or crystalline solids: Polyurethane, Naphthalene, Benzoic acid, Teflon, Potassium nitrate, Cellophane, Polyvinyl Chloride, Fiberglass, and Copper.
Polyurethane, Cellophane, Polyvinyl Chloride, Fiberglass, and Teflon are examples of amorphous solids, while Naphthalene, Benzoic acid, Potassium nitrate, and Copper are examples of crystalline solids. Amorphous solids are ones whose solid geometry is amorphous. Solids with crystalline structures have regular solid geometry.
