The Solid State

Question 1
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Why are solids rigid?

Solution
Solids are rigid because the internuclear distance between the  molecules of a solid are very less and closely packed and their positions are fixed due to the strong forces of attraction between them.
Question 2
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Why do solids have a definite volume?

Solution
A solid have a definite volume because the inter molecular distance  between its molecules are fixed.
Question 3
CBSEENCH12005351

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

Solution
Amorphous solids: Polyurethane, teflon, cellophane, polyvinyal chloride, fibre glass.
Crystalline solids: naphthlene, benzoic acid, potassium nitrate, copper.
Question 4
CBSEENCH12005352

Why is glass considred a super-cooled liquid?

Solution
Glass is amorphous solids and  have a tendency to flow, though very slowly. Therefore, these are called pseudo solids or super cooled liquids .

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