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What is low Vapour pressure?

Vapour pressure is a measure of the ability of a compound to bond with itself; compound molecules that bond well with each other will have a low vapour pressure (less tendency to escape to the vapour phase), while poorly bonding compounds will have a high vapour pressure.

Which sample has the lowest vapor pressure Why Brainly?

  • Answer : (2) Ethanoic acid has the lowest vapor pressure at .
  • Explanation :
  • Vapor pressure is the pressure which is exerted by vapor when the vapor form is in equilibrium with the solid or liquid form.
  • Boiling point is the temperature in which the vapor pressure of liquid is equal to the atmospheric pressure.

Does water have the lowest vapor pressure?

The hydrogen bonding between liquid water molecules explains why water has an unusually low vapor pressure. Relatively few molecules of water are capable of escaping the surface of the liquid and enter the vapor phase. Evaporation is slow and thus the vapor exerts a low pressure in a closed container.

Why does water have such a low vapor pressure?

How do you increase the vapor pressure of water?

The vapor pressure of a liquid varies with its temperature, as the following graph shows for water. The line on the graph shows the boiling temperature for water. As the temperature of a liquid or solid increases its vapor pressure also increases. Conversely, vapor pressure decreases as the temperature decreases.

The pressure of gas above a liquid affects the boiling point. In an open system this is called atmospheric pressure. The greater the pressure, the more energy required for liquids to boil, and the higher the boiling point.

Why does water’s boiling point increase with pressure?

As the pressure applied to the liquid surface is increased, the energy needed for the liquid molecules to expand to gas phase also increases. Hence, a higher temperature is required to change liquid to gas phase. So, boiling point of liquid rises on increasing pressure.

What is the effect of pressure on melting and boiling point?

The boiling point of liquids always increases when pressure is applied on that liquid. This is because the molecules of the liquid will require comparatively more energy to turn into gaseous state when pressure is applied on that substance.

Which of the following conditions will increase the boiling point of water at constant temperature and pressure?

The water molecules need more energy to produce enough pressure to escape the boundary of the liquid. The more salt (or any solute) added to water, the more you raise the boiling point. The phenomenon depends on the number of particles formed in the solution.

Does impurities increase melting point?

The melting point of a substance decreases with increase in presence of impurities in it. The melting point of ice decreases from 0 °C to -22 °C on mixing salt in it in proper proportion. That is why salt is added to make freezing mixtures to keep ice creams frozen.