Question

Explain, in terms of bonding and structure, the difference in the melting point between SrCl2 and SiCl4. ?

Answer 1

`SrCl_2` is held together by strong ionic bonds whereas `SiCl_4` is held together by relatively weak intermolecular forces

Explanation:

`SrCl_2` is an ionic compound. In solid `SrCl_2` theparticles are arranged in a lattice structure, held together by strong ionic bonds between the oppositely charged `Sr^(2+)` and `Cl^-` ions.

`SiCl_4` is a covalent compound, and so in solid `SiCl_4`, the molecules are held together by weak intermolecular forces.

Ionic bonds are incredibly strong, and require a lot of energy to break. As a result, ionic compounds have high melting points.

Intermolecular forces are weak, however, requiring less energy to break than ionic bonds, so covalent compounds have low melting points.