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 liquids have low boiling point than solids ?

    Right Option : B
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    Question : 2

    Which of the following are correct :

    (a) The molecule of carbon dioxide and Water are similar.

    (b) The molecule of carbon dioxide and Water are different.

    (c) The molecules of ammonia contains Nitrogen only.

    Right Option : B
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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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