The influence of intermolecular forces

Impact of Strength of Intermolecular Forces The stronger the intermolecular force (within a series of like elements) the higher the melting and boiling points will be. So by looking at the boiling points for a series of molecules, the one with the highest value also has the strongest intermolecular forces.

Impact of Strength of Intermolecular Forces

Surface Tension Surface tension is the result of intermolecular forces bonding molecules together to form an outer skin. The skin is the barrier between the inside substance and the outside.

Surface tension is used to hold the paper clips up.

Surface Tension The more surface tension between the molecules, the more paper clips can be held up. For more surface tension do you think we need stronger or weaker intermolecular forces? Stronger intermolecular forces

Viscosity Viscosity is the measurement of the resistance of a substance to flow. The more resistance to flow, the higher the viscosity. It is also related to intermolecular forces.

Viscosity Do you think a liquid with a greater resistance to flow (higher viscosity), will have stronger or weaker intermolecular forces? STRONGER intermolecular forces

The beaker on the right has the greater resistance to flow The beaker on the right has the greater resistance to flow. The beaker to the right has the stronger intermolecular force(s).

Vapor Pressure Vapor pressure is the pressure from the gas that is above the liquid or solid of the exact same substance when the rate of evaporation equals the amount of condensation.

Impact of IMF from Vapor Pressure Strong intermolecular forces have low vapor pressure Weak intermolecular forces have strong vapor pressure