Question

On heating, the intermolecular space between the molecules -----------------------.

Answer 1

1. Solids are composed of closely packed atoms or molecules.
2. In response to heating, their kinetic energy separates neighboring atoms or molecules from one another.
3. A result of this pushing between atoms or molecules is a slightly increased distance, on average, between atoms or molecules.

Accordingly, solids become weaker as they are heated and their intermolecular space increases.