What factors influence boiling point?
The boiling point of a liquid depends on temperature, atmospheric pressure, and the vapor pressure of the liquid. When the atmospheric pressure is equal to the vapor pressure of the liquid, boiling will begin.
What affects boiling and melting points?
The similarity between melting points and boiling points means that the same factors that impact the melting point of a compound will also impact the boiling point. Therefore, the strength and types of intermolecular forces that are found within the liquid compound will affect the boiling point.
How do intermolecular forces affect the boiling point of a liquid?
Higher the intermolecular forces between the liquid particles, harder it is for it to escape into the vapor phase, ie., you need more energy to convert it from liquid to the vapor phase, in other words, higher its boiling point.
What affects melting point?
Molecular composition, force of attraction and the presence of impurities can all affect the melting point of substances.
How does pressure affect melting point?
Most liquids are less dense than the solid phase, so higher pressure increase the melting point. The dotted green line shows the melting point for water. Water is denser as a liquid, so higher pressures decrease the melting temperature.