Question

i.
The melting point of sodium chloride is 801 °C.
The melting point of chlorine is -101 °C.
Explain, in terms of structure and bonding, the difference between the melting points of
these two substances.

Answer 1

Answer:

Sodium chloride (NaCl) has a melting point of 801 °C. ... Sodium chloride is a giant ionic lattice. To melt the substance the strong electrostatic attractions between oppositely charged ions (ionic bonds) must be overcome. This requires large amounts of energy and thus the melting point is high.

Answer 2

Answer:

The attraction in carbon dioxide is weak so it can be easily overcome giving you a low melting point. While the attraction in sodium chloride is strong, it takes more energy to overcome the forces, thus a higher melting point.