shaalaa.com | Solid States part 4 (Crystalline & Amorphous: difference and uses)
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Two dimensional structure of (a) quartz and (b) quartz glass , Distinction between Crystalline and Amorphous Solids
Classify the following as amorphous or crystalline solids:
Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.
What makes a glass different from a solid such as quartz? Under what conditions could quartz be converted into glass?
'Stability of a crystal is reflected in the magnitude of its melting point'. Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?
Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?