1. I think the bond between ions is stronger than the bond between molecules because most ionic bonds have a higher melting point. Ionic bonds are also electrically attracted to each other, while molecules are not.
2.When you melt something, it's a physical change. Physical changes don't rearrange the atoms, chemical changes do. Therefore if you melted HCl molecules, they would not seperate.
3. When ionic substances are melted, the molecules are free to move around and create a charge.
4. Molecular substances do not create a charge because molecules have a neutral charge.
Enrichment:
A polar molecule is a molecule with a bond from having two atoms with opposite charges. Water is a polar molecule.
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