Does Vapor Pressure decrease as intermolecular forces increase???

yes.

Thanks, i had my doubts! I was also wondering how i can determine which ionic solid will have the least melting point. Do i look at the intermolecular forces, or do i need to look else where for my answer???

ionic solids? I would look at lattice energies.

http://www.tulane.edu/~bmitche/book/mptab.html

Yes, vapor pressure decreases as intermolecular forces increase.

To understand why this happens, let's start by defining vapor pressure. Vapor pressure is the pressure exerted by the vapor phase of a substance when it is in equilibrium with its liquid or solid phase. It is a measure of the tendency of molecules in the substance to escape into the gas phase.

Intermolecular forces are attractive forces between molecules. They can be categorized into different types, such as dipole-dipole interactions, hydrogen bonding, and London dispersion forces. These forces arise due to the interaction of the electrons and nuclei of neighboring molecules.

In a substance with strong intermolecular forces, the attractive forces between molecules are stronger. This means that it requires more energy for a molecule to break away from the liquid or solid phase and enter the gas phase. As a result, fewer molecules are able to escape into the gas phase, leading to a lower vapor pressure.

On the other hand, in a substance with weak intermolecular forces, the attractive forces between molecules are weaker. Therefore, molecules have an easier time breaking away from the liquid or solid phase and entering the gas phase. This results in a higher vapor pressure.

So, to summarize, as intermolecular forces increase, the attractions between molecules become stronger, making it harder for molecules to escape into the gas phase. Consequently, the vapor pressure decreases.