What are molecular solids?

The Basics 

• Molecular solids are made of molecules or atoms held together by intermolecular forces, not covalent bonds.
  • Learn more through this study guide on Intramolecular Force and Potential Energy

• Take ice, for example. 
• Sure, each individual molecule is held together by covalent bonds, but the actual solid is created by hydrogen bonds connecting the molecules to each other. 

Source: chemguide

Properties

• Intermolecular forces are weaker than ionic or covalent bonds, so molecular solids are relatively soft and flexible.
• This also means they tend to have low melting points.
• They do not conduct electricity because electrons are localized within individual molecules. 
• Polar molecular solids, like sugar, will be soluble in water. 
• Keep in mind that the individual molecules don't break apart, only the intermolecular forces do!