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