Chapter 12.3, Problem 22SSC

Interpretation Introduction

Interpretation:

Difference between molecular solid and a covalent network solid must be explained.

Concept introduction:

Depending on force of attraction there are different types of solid like ionic solid, molecular solid, covalent network solid etc.

Answer to Problem 22SSC

A molecular solid has a single unit whereas a covalent network solid is extended in three dimensions.

Explanation of Solution

Iodine is a molecular solid in which two I atoms are bonded with covalent bond.

In covalent network solid there is no distinct molecule or unit. For example in SiO₂ each Si is bonded with 4 O atoms and each O is bonded with 2 Si atoms. Thus the structure is extended in all directions.

Conclusion

A molecular solid has distinct unit or molecule unlike a covalent network solid.