Question 3
Classify the following as amorphous or crystalline solids:
Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.
Solids are classified into 2 types:
Crystalline solids | Amorphous solids |
Crystalline solids-exists as small crystals,each crystal having a characterstic geometrical shape.The atoms,ions or molecules are arranged in a regular, repeating three dimensional pattern called the crystal lattice. | Amorphous solids( Greek term amorphous-no form)- has atoms, molecules or ions arranged at random & lacks the ordered crystalline lattice.
|
Naphthalene, benzoic acid, potassium nitrate, copper | Polyurethane, teflon, cellophane, polyvinyl chloride, fibre glass |
