How is a substance's structure and function affected by the attractive and repulsive forces of its molecules

a substance's physical properties are highly dependent upon the attractive and repulsive forces of its molecules.

A substance having strong inter molecular force of attraction will be solid, have high strength, fixed shape and volume. High melting point.

A substance having moderate intermolcualr force of attractions will be liquid, will be able to flow, have no fixed shape but have fixed volume.

A substance having weak intermolecular forces of attractions will be gas, will be able to flow, no fixed shape and no fixed volume.

Also the properties like viscosity, surface tension , vapour pressure, boiling point, melting point all the properties depends upon the intermoleuclar force of attractions.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".