Question

which characteristic best explains the difference in melting behavior of covalent substances and ionic substances? ionic substances have weaker intermolecular attractions. ionic substances usually have stronger atomic bonds. covalent substances have weaker intermolecular attractions. covalent substances usually have stronger atomic bonds.

Explanation:

1. Melting involves overcoming intermolecular forces. Ionic substances have strong electrostatic - attractions between ions, forming a lattice structure, resulting in high melting points.
2. Covalent substances usually have weaker intermolecular forces like van der Waals forces or hydrogen - bonding (in some cases), leading to lower melting points. Atomic bonds are not directly related to the melting behavior in this context as melting is about separating molecules or ions, not breaking atomic bonds within molecules.

Answer:

Covalent substances have weaker intermolecular attractions.