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What accounts for the low melting and boiling points of covalent molecules?

Chemistry
JAMB 2024

What accounts for the low melting and boiling points of covalent molecules?

  • A. They have weak intermolecular forces.
  • B. They are three-dimensional structures.
  • C. They have definite shapes.
  • D. They possess shared electron pairs
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Correct Answer: Option A
Explanation

Covalent molecules have low melting and boiling points because of their weak intermolecular forces.The force of attraction between the molecules in a covalent compound is weak, so it takes little energy to break the bonds.

Yes, all covalent compounds have a three-dimensional structure due to the directional nature of covalent bonds, which means the atoms within a molecule are arranged in a specific spatial orientation, giving the molecule a definite shape in three dimensions; this is explained by the Valence Shell Electron Pair Repulsion (VSEPR) theory. 

There is an explanation video available below.


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Explanation Video

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