Why do covalent compounds generally have low melting and boiling points?
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A.
They have a rigid lattice structure.
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B.
They contain metallic bonds.
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C.
They have strong electrostatic forces.
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D.
They have weak intermolecular forces.
Correct Answer:
D. They have weak intermolecular forces.
Explanation:
Covalent compounds consist of molecules held together by weak intermolecular forces rather than strong chemical bonds like ionic or metallic ones. Because these attractions between individual molecules require very little thermal energy to overcome, covalent substances typically possess low melting and boiling points. Unlike ionic lattices or metallic structures, which are held together by powerful electrostatic forces throughout the entire structure, the energy needed to separate covalent molecules and change their state is relatively minimal.
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