In relation to vapor pressure, what does a higher boiling point indicate about a liquid?

• A. It has a higher temperature threshold for vaporization
• B. It has lower vapor pressure
• C. It is more flammable
• D. It is less dense

Answer: (A)

A higher boiling point of a liquid indeed indicates that it has a higher temperature threshold for vaporization. This means that it requires more heat to overcome the intermolecular forces holding the liquid molecules together, allowing them to enter the vapor phase. As a result, liquids with higher boiling points will not vaporize as readily at lower temperatures compared to those with lower boiling points.

While it is true that a higher boiling point can correlate with lower vapor pressure—because generally, lower vapor pressure indicates that fewer molecules are escaping into the vapor phase at a given temperature—this connection is not a direct implication of boiling point. The notion of flammability and density relates to other chemical properties rather than boiling point alone. Thus, the primary takeaway is that the boiling point serves as an indicator of the energy required for a liquid to transition into a vapor, emphasizing its threshold for vaporization.