Gen Chem II - Chapter 11

What does IMF stand for?

Intermolecular forces

What are intermolecular forces?

Intermolecular forces are attractions between different molecules.

What do intermolecular forces do?

Intermolecular forces influence the rates at which substances will change states. ei. boiling point and rate of vaporization

What can we assume about the rate of vaporization of a molecule with strong IMFs?

A molecule with strong intermolecular forces will have a lower vapor pressure because fewer of the molecules will be able to evaporate, due to strong forces, resulting in a low number of evaporated [gas] molecules. ei. low vapor pressure

What can we assume about the boiling point of a molecule with strong IMFs?

A molecule with strong intermolecular forces will have a high boiling point. Strong intermolecular forces require more energy [heat] to be broken apart, therefore higher boiling point.

What is the definition of vapor pressure?

Vapor pressure is the pressure exerted by vapor at equilibrium. (When the rate of condensation equals the rate of evaporation)

What factors effect vapor pressure?

Vapor pressure is affected by intermolecular forces, surface area, and temperature

How does temperature affect rate of evaporation?

Rate of evaporation increases as temperature increases