Vapor Pressure

Front

What is vapor pressure?

Back

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature.

Front

How does temperature affect vapor pressure?

Back

As temperature increases, vapor pressure increases because more molecules have enough energy to escape the liquid phase.

Front

What is the relationship between boiling point and vapor pressure?

Back

A substance boils when its vapor pressure equals the external pressure; higher vapor pressure means a lower boiling point.

Front

What are intermolecular forces?

Back

Intermolecular forces are forces of attraction or repulsion between neighboring particles (atoms, molecules, or ions).

Front

Which type of intermolecular force is the strongest?

Back

Hydrogen bonds are the strongest type of intermolecular force.

Front

What is volatility?

Back

Volatility is a measure of how readily a substance vaporizes; high volatility means high vapor pressure.

Front

What happens to vapor pressure as the strength of intermolecular forces increases?

Back

As the strength of intermolecular forces increases, vapor pressure decreases.

Front

What is the effect of altitude on boiling point?

Back

At higher altitudes, atmospheric pressure is lower, which decreases the boiling point of liquids.

Front

What is the significance of a substance's boiling point?

Back

The boiling point indicates the temperature at which a substance changes from liquid to gas under a given pressure.

Front

How do dispersion forces compare to hydrogen bonds?

Back

Dispersion forces are weaker than hydrogen bonds and are present in all molecules, but are the only forces in nonpolar molecules.