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

Question

Philoid · Accepted Answer

SUBSTANCE	TYPE OF SOLID
Polyurethane	amorphous solid
Naphthalene	crystalline solid
Benzoic acid	crystalline solid
Teflon	amorphous solid
Potassium nitrate	crystalline solid
Cellophane	amorphous solid
Polyvinylchloride	amorphous solid
Fibre glass	amorphous solid
Copper	crystalline solid

Explanation: Amorphous solids are not true solids, in these solids the constituent particles (atoms, ions or molecules) have short range order of arrangement.

In crystalline solids the constituent particles have long range order of arrangement)