What is the relationship between Vapour pressure & boiling point?
The higher the liquid’s vapor pressure at a temperature, the lower its normal boiling point (i.e. the boiling point at atmospheric tension) of the liquid.
Does Vapour pressure depend on volume?
Vapor pressure is dependent on the liquid’s composition and temperature. The total surface area and volume of the liquid as well as the volume in the container do not affect vapour pressure. However, the amount of liquid that remains at equilibrium will be important.
Why does the vapour pressure not change with a change in liquid volume?
Vapor Pressure does not depend upon surface area. It is calculated from the thermodynamic equilibrium of liquid and gas phases in a substance.
Does boiling rely on surface area?
Branching lowers the boiling point. This increases the attraction of individual molecules.
What is the effect on boiling point of branching?
As branching grows, the surface area decreases. This results in a smaller area of contact. The Van der Waals force decreases, which can be overcome at lower temperatures. The boiling point of an alkane-chain decreases as the branching increases.
What factors affect the melting point?
The melting point of a compound is affected by the force of attraction between molecules. Stronger intermolecular interactions result in higher melting points. High melting points are common for ionic compounds because of the stronger electrostatic forces that hold the ions (ion/ion interaction).
How do impurities affect the boiling point?
Impurities increase the boiling point. Because impurities reduce the amount of water molecules that can be vaporized during boiling, this is why it is so hot. To make an impure solution vapourize, it takes more heat than to make a pure one vaporize.