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Classify the following as amorphous or c...

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

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Amorphous solids, polyurethane, teflon, cellophone, polyvinyl chloride, fibre glass,
Crystalline solids: Benzoic acid, potassium nitrate , copper.
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