What is vapour Mcq?
Solution(By Examveda Team) Water vapour, water vapour or aqueous vapour is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapour can be produced from the evaporation or boiling of liquid water or from the sublimation of ice.
Which of the following statement is true about the vapour pressure of a liquid Mcq?
Which of the following statement is true about vapor pressure of a liquid? Explanation: The vapor pressure of a liquid at a given temperature is given by the pressure ex-erted by the saturated vapor on the liquid surface. When the vapor is saturated, an equilibrium exists between the liquid and the vapor phases.
Which type of liquid give high vapor pressure?
Volatile liquids
Volatile liquids are liquids with high vapor pressures, which tend to evaporate readily from an open container; nonvolatile liquids have low vapor pressures. When the vapor pressure equals the external pressure, bubbles of vapor form within the liquid, and it boils.
Which of the following is true about vapor pressure of liquid?
The correct statement is “the vapor pressure of a liquid is an equilibrium pressure.”
Is water a vapor?
Water vapor, water vapour or aqueous vapor is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice….Water vapor.
| Water vapor (H2O) | |
|---|---|
| Liquid state | Water |
| Solid state | Ice |
| Properties | |
| Molecular formula | H2O |
What is vapour state?
Vapour is simply defined as the phase of a gas at a temperature where the same substance can exist in both liquid and solid states.
What does vapor pressure measure?
Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid.
Which has lowest vapor pressure?
The substance with the highest boiling point will have the lowest vapor pressure. Vapor pressure is a liquid property related to evaporation. In the liquid (or any substance) the molecules have a distribution of kinetic energies related to the temperature of the system.
Why is vapor pressure independent of surface area?
Vapor pressure does not depend on surface area because it is derived from the thermodynamic equilibrium between the liquid and gas phases of a substance. The closer the vapor pressure is to atmospheric pressure, the closer that substance is to boiling.
When temperature increases the vapor pressure of a liquid?
As the temperature of a liquid increases, the kinetic energy of its molecules also increases and as the kinetic energy of the molecules increases, the number of molecules transitioning into a vapor also increases, thereby increasing the vapor pressure.
How are Vapours formed?
Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Water vapor is transparent, like most constituents of the atmosphere. Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by condensation.
How are vapors generated?
Vapor is generated through the addition of a liquid into a gaseous stream, usually under temperature. We add control to each of the inputs, thereby acquiring control of the output.
Do gases have vapor pressure?
Note that the rate of evaporation of the solid is equal to the rate of condensation of the gas. The pressure exerted by the gas in equilibrium with a solid or liquid in a closed container at a given temperature is called the vapor pressure….
| substance | vapor pressure at 25oC |
|---|---|
| water | 0.03 atm |
What does vapor pressure depend on?
temperature
Vapor pressures are dependent only on temperature and nothing else. The vapor pressure of a liquid does not depend on the amount on the liquid in the container, be it one liter or thirty liters; at the same temperature, both samples will have the same vapor pressure.
Does vapor pressure increase with size?
The bigger the molecule is and the more electrons it has, the bigger the London forces are. Bigger molecules usually have larger molecular weights; hence the correlation of vapor pressure with molecular weight.
Which has highest vapour pressure?
Ether has the highest vapour pressure (i.e., lowest boilint point) at any temperature. The reason for its high vapour pressure is that the attraction is less between ether molecules than between water and alcohol molecules.