Question:1. Write down the characteristics of gas?

Gases show some uniform behaviour, which are not exhibited by other matters. The mentionable characteristics of gases are given below:

i) Structure: Gas is a homogenous physical state of matter. It is composed of tiny, roundshape, elastic particles.

ii) Miscibility (mixing ability): More than one gas can mix up in any ratio forming a

homogenous mixture.

iii) Pressure: In a gaseous state matter has no definite pressure. The gas molecules

move all the time in straight path in all directions. By this time, they exert pressure in the wall of the container. The force that a gas molecule exerts per unit area of the container is called the gas pressure. iv) Uncertainty of shape & volume: Gases have no definite shape and volume. They

acquire the shape of the container in which they are kept by consuming total volume.

v) Relative volume: The relative volume of gas is very high compared to the solid & liquid substances. vi) Intermolecular attraction force and space: In gases, the intermolecular space is

high and the intermolecular force of attraction is very low or negligible.

vii) Contraction and expansion: As the intermolecular space is high in gases they are

more compressible. Again, as the intermolecular force of attraction is negligible, the expansion ability of gases is high in comparison to liquids and solids. viii) Effect of temperature & pressure: If the pressure is increased the volume of gases decreases and at constant pressure, if the temperature is increased the volume also increases.

Question:2. Write down the difference between gas and vapour.

Ans.: The differences between gas and vapour are given below:

Definite:

Gases:  Gas is a substance which neither has definite shape or a definite valume. In gases intermolecular space is high, intermolecular attraction is low.

Vapour:  Gaseous phase below critical Definition is known as vapour.

Liquefaction:

Gases:  Gas can be liquefied by applying pressure when the temperature of gas is below the temperature.

Vapour:  By applying only pressure of cooling vapour can be liquefied. Such as- steam can liquefy by

applying pressure or cooling.

Examples:

Gases:  Hydrogen, Oxygen, Nitrogen etc are some gases

Vapour:  Steam, bromine vapour, ethanol vapour are some gases.

Discussion details characteristics of gas and Vapour

Question:1. Write down the characteristics of gas?

Gases show some uniform behaviour, which are not exhibited by other matters. The mentionable characteristics of gases are given below:

i) Structure: Gas is a homogenous physical state of matter. It is composed of tiny, roundshape, elastic particles.

ii) Miscibility (mixing ability): More than one gas can mix up in any ratio forming a

homogenous mixture.

iii) Pressure: In a gaseous state matter has no definite pressure. The gas molecules

move all the time in straight path in all directions. By this time, they exert pressure in the wall of the container. The force that a gas molecule exerts per unit area of the container is called the gas pressure. iv) Uncertainty of shape & volume: Gases have no definite shape and volume. They

acquire the shape of the container in which they are kept by consuming total volume.

v) Relative volume: The relative volume of gas is very high compared to the solid & liquid substances. vi) Intermolecular attraction force and space: In gases, the intermolecular space is

high and the intermolecular force of attraction is very low or negligible.

vii) Contraction and expansion: As the intermolecular space is high in gases they are

more compressible. Again, as the intermolecular force of attraction is negligible, the expansion ability of gases is high in comparison to liquids and solids. viii) Effect of temperature & pressure: If the pressure is increased the volume of gases decreases and at constant pressure, if the temperature is increased the volume also increases.

Question:2. Write down the difference between gas and vapour.

Ans.: The differences between gas and vapour are given below:

Definite:

Gases:  Gas is a substance which neither has definite shape or a definite valume. In gases intermolecular space is high, intermolecular attraction is low.

Vapour:  Gaseous phase below critical Definition is known as vapour.

Liquefaction:

Gases:  Gas can be liquefied by applying pressure when the temperature of gas is below the temperature.

Vapour:  By applying only pressure of cooling vapour can be liquefied. Such as- steam can liquefy by

applying pressure or cooling.

Examples:

Gases:  Hydrogen, Oxygen, Nitrogen etc are some gases

Vapour:  Steam, bromine vapour, ethanol vapour are some gases.

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