Physical Science_IMFA

It is the temperature at which the substance changes from liquid to gas.

• Melting Point

• Viscosity

• Boiling Point

• Surface Tension

Answer explanation

Boiling point is the temperature at which the substance changes from liquid to gas. Similar to melting point, stronger intermolecular forces mean greater amount of energy is needed to break the attractive forces between molecules. Substances with stronger IMFA have higher boiling points compared to those with weaker IMFA.

It is the temperature at which the substance changes from solid to liquid.

• Melting Point

• Boiling Point

• Surface Tension

• Viscosity

Answer explanation

Melting point is the temperature at which the substance changes from solid to liquid. Stronger intermolecular forces mean greater amount of energy is needed to break the attractive forces between molecules. Substances with stronger IMFA have higher melting points compared to those with weaker IMFA.

It is the tendency of a fluid to acquire the least possible surface area.

• Surface Tension

• Viscosity

• Boiling Point

• Melting Point

Answer explanation

Surface Tension is the tendency of a fluid to acquire the least possible surface area. Molecules with stronger intermolecular forces will exert greater cohesive forces and acquire less surface area (higher surface tension) than those with weaker IMFA.

It is the measure of a fluid’s resistance to flow.

• Boiling Point

• Melting Point

• Viscosity

• Surface Tension

Answer explanation

Viscosity is the measure of a fluid’s resistance to flow. Molecules with stronger intermolecular forces have greater resistance to flow, and thus, higher viscosity compared to those with weaker IMFA.

It is the pressure exerted by a vapor in equilibrium with its liquid phase in a closed system.

• Viscosity

• Vapor Pressure

• Melting Point

• Boiling Point

Answer explanation

Vapor Pressure is the pressure exerted by a vapor in equilibrium with its liquid phase in a closed system. Molecules with stronger intermolecular forces have less tendency to escape as gas, and thus lower vapor pressure compared to those with weaker IMFA.

When molecules have strong intermolecular forces of attraction, they are packed close together. They often exist as condensed phase (solid or liquid) at room temperature.

• Phase at room temperature

• Melting Point

• Boiling Point

• Solubility

Answer explanation

When molecules have strong intermolecular forces of attraction, they are packed close together. They often exist as condensed phase (solid or liquid) at room temperature. When molecules have weak intermolecular forces of attraction, they are far apart from each other. They often exist as gas at room temperature.

This refers to the ability of a substance to dissolve in a given amount of solvent at a specified temperature.

• Melting Point

• Boiling Point

• Surface Tension

• Solubility

Answer explanation

Solubility refers to the ability of a substance to dissolve in a given amount of solvent at a specified temperature. Recall the rule “like dissolves like.” When the solute and the solvent both exhibit the same intermolecular forces of attraction, they form a solution.

What does IMFA stands for?

• Intermolecular Forces of Attraction

• Intermission Forces of Attractiveness

• Interschool Forces of Attraction

• Intermolecule Forces of Attraction