GAS LAWS AND MOLE CONCEPT REVISION (1).pdf

CONCEPT

1. GAS LAWS AND MOLE
CONCEPT

3. VOLUME, TEMPERATURE, PRESSURE OF A GAS
Volume of a gas
Volume of a gas is the volume of the container which it occupies. If a gas which is kept in a
cylinder having a volume of 1 liter, is completely transferred to another 5 litter cylinder then
its new volume become 5 liter.
Pressure of the gas
Force exerted per unit Area is called pressure. Pressure of the gas is the force experienced per
unit area on the inner surface of the container. as a result of the collision of the gas molecules
on the surface. Force on unit area= total force exerted on the surface/ surface are.
Temperature of gas
When we heated a gas. The kinetic energy of a gas is increases and molecules are move very
fastly. Temperature of gas is defined as the average kinetic energy of molecule in a
substance.

5. a) In gaseous state
o Energy of molecules is very high
o Distance between molecules is very high
o Attractive force is very low
o Freedom of movement is very high
b)
o Molecules are in random movement in all direction and collide each other
o The collisions with the walls account for the pressure of a gas and the collisions of molecules
are perfectly elastic in nature thus there is no loss of energy.

7. GAS LAWS

8. Boyle’s law (relation between volume and pressure of gas)
Boyle’s law state that, at constant temperature, volume of definite mass of gas is inversely
proportional to its pressure.
❑The size of air bubble rising from the bottom in an aquarium increases.
❑The size of climate balloon increases as they move in upward direction to the higher altitude
in the atmosphere.
❑When an inflated balloon is immersed in a water, its size decreases

9. Charles’ law( relation between volume and temperature of a gas)
Charles’ law is defined as at constant pressure, the volume of a definite mass of a gas is directly
proportional to the temperature in Kelvin scale.
❑When an inflated balloon is kept in sunlight, it will burst.
❑Vehicle tyres are not fully inflated during summer season.
❑When an inflated balloon kept in cold water, its size decreased.

10. Avagadro’s law: (Relation between volume and number of moles)
Avagadro’s law states that at constant temperature and pressure the volume of a gas is directly
proportional to the number of molecules

11. a)1) Boyles’s Law
2) Avogadro Law
b) Bottom of the water has high pressure, as a result the volume also decreases. Pressure
and volume are inversely proportional to each other If the number of molecules increases
the volume of gas increases

16. a. The size of the air bubbles rising from the bottom of an aquarium increases because the
pressure decreases on moving upwards
b. Boyle’s law
c. At a constant temperature, volume of a definite mass of a gas is inversely proportional to
its pressure

19. MOLE CONCEPT

36. THANK YOU