Question

Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

Answer 1

Amorphous solids: Polyurethane, teflon, cellophane, polyvinyl chloride, fibre glass. Crystalline solids: Benzoic acid, potassium nitrate, copper, naphthalene.

Answer 2

1. -Crystalline solids are also known as true solids and amorphous solids are also known as pseudo solids or supercooled liquids.
2. So Polyurethane is an amorphous solid.
3. Naphthalene is a crystalline solid.
4. Benzoic acid is a crystalline solid.
5. Teflon is an amorphous solid.
6. Potassium nitrate is a crystalline solid.
7. Cellophane is an amorphous solid.
8. Polyvinyl chloride is an amorphous solid.
9. Fiberglass is an amorphous solid.
10. Copper is a crystalline solid.