Properties of Molecules


 
 
Concept Explanation
 

Properties of Molecules

Properties of Molecules:

  • Melting and boiling points: Molecular substances tend to be gases, liquids or low melting point solids, because the intermolecular forces of attraction are comparatively weak.
  • Solubility in water: Most molecular substances are insoluble (or only very sparingly soluble) in water.
  • Electrical conductivity: Molecular substances won't conduct electricity.
  • The molecules of any given substance are all similar. Thus, all the molecules of water are similar.
  • The molecules of different substances are different. The molecules of water are entirely different in properties from the molecules of carbon dioxide.
  • The properties of a substance are the properties of its molecules. Thus, the properties associated with water are the properties of H_{2}O molecules.
  • Sample Questions
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    Question : 1

    Why boiling point of gases is low as compared to solids ?

    Right Option : A
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    Question : 2

    Which of the following are correct

    (a) Most molecular substances are insoluble in water.

    (b) Molecular substances won't conduct electricity.

    (c) The molecules of any given substance are all similar.  

     

    Right Option : D
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    Question : 3

    Which of the following is correct :

    (a) The properties of a substance are the properties of its molecules.

    (b) The molecules of different substances are different.

    Right Option : C
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