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

Classify the following as amorphous or crystalline solids: Polyurethan

1.	Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.
Answer» Solution :Amorphous solids. POLYURETHANE, teflon. CELLOPHANE, polyvinyl CHLORIDE, fibre glass. CRYSTALLINE solids. Benzoic acid, potassium nitrate, COPPER