The Solid State

  • Question 1
    CBSEENCH12005349

    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
    CBSEENCH12005350

    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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