Particle Model & Pressure

Question 1

Particle Motion in Gases

Answer 1

Molecules of gases in constant random motion
Temperature of gas related to average kinetic energy of the molecules
Changing temperature of a gas, held at constant volume, changes the pressure exerted by the gas

Question 2

Pressure in Gases

Answer 2

Due to particles colliding with walls of container - produces a net force at right angles to wall of container
Increasing temp: particles have more kinetic energy - more collisions per second (higher energy collisions), pressure increase
Increasing volume: particles more spread out - less frequent collisions (pressure decrease)

Question 3

Pressure formula

Answer 3

pressure (Pa) * Volume (m^3) = constant

p V = constant

Question 4

Increasing pressure of a gas

Answer 4

Work done is transfer of energy by a force
Doing work on gas -> transferred energy to particles -> increased internal energy of gas (includes kinetic energy) -> increase temperature (related to average kinetic energy of particles) -> increases pressure

Question 5

Pressure

Answer 5

The effect of a force on a given area

Question 6

Bike pump increasing temperature

Answer 6

Doing work on enclosed gas mechanically. Gas applies pressure to plunger of pump, so exerts a force on it. Work done against force to push down plunger.
This transfers energy to kinetic energy stores of gas particles, increasing temperature