Particle Model Of Matter-Particle Model And Pressure Flashcards
Describe the motion of molecules in the gas?
They are in constant random motion
What factors affect the average kinetic energy of a gas molecule?
The temperature of the substance
The higher the temperature the higher the average kinetic energy of the molecules
What affects does increasing temperature have on the pressure of a gas when held at constant volume?
Pressure of the gas will increase as the temperature increases
What does pressure increase as temperature increases?
Kinetic energy of molecules increase
Collisions between molecules becomes more frequent
Greater rate of change of momentum
Greater force and therefore pressure
If gas A is at a low pressure and gas B is at a high pressure what can be said about the rate of collisions in each gas?
There are more collisions per second in gas B than in gas A
The rate of collisions is higher in B
Describe the force that the pressure of a gas exerts on the walls of its container?
The net force acts at right angles to the containers surface
The force increases as pressure increases
Explain how increasing the volume of a gas results in a decrease of pressure?
Molecules become more spread out and so time between collisions increases
This reduces the rate of collisions
Rate of change of momentum
decreases and so force exerted on container decreases resulting in a lower pressure
What is the unit used for pressure?
Pascal(pa)
What increases when you do work on a gas?
The internal energy of the gas
This can also lead to an increase of temperature
Why does the temperature of air inside a bike pump increase when it is pumped?
Work is done on a gas when it is compressed
Doing work on gas increases it’s internal energy so also increases the average kinetic energy of the molecules
Temperature increases with an increase of average kinetic energy
