Q- Classify the following as amorphous or crystalline solids polyurethane, naphthalene, benzoic acid, Teflon, potassium nitrate, cellophane, polyvinyl chloride, fiber glass, copper.
Answer- All the substances are classified below-
| Polyurethane | Amorphous solid |
| Naphthalene | Crystalline solid |
| Benzoic acid | Crystalline solid |
| Teflon | Amorphous solid |
| Potassium nitrate | Crystalline solid |
| Cellophane | Amorphous solid |
| Polyvinyl chloride | Amorphous solid |
| Fiber glass | Amorphous solid |
| Copper | Crystalline solid |
Note- Amorphous solids are those solids that are solids that do not have a definite form or state. On the other hand, Crystalline solids are those solids that are attached to a highly ordered microscopic structure. You can easily classify them on the basis of their structure.