Particle And Model Pressure Flashcards
Describe the motion of molecules in a gas
They are in a constant random motion
Which factor affects the average kinetic energy of gas molecules?
Temp of substance
Higher the temp, higher the average kinetic energy
What effect does increasing temperature have on the pressure of a gas when held at constant volume?
Pressure of gas will increase as temperature increases
Why does pressure of gas increase as temp increases?
- kinetic energy of molecules increases
- collisions between molecules 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?
More collisions per second in gas A than gas B
Rate of collision higher in gas A
Describe the force the pressure of a gas exerts on walls of container
Net force acts at right angles to containers surface
Force increases as pressure increases
Explain how decreasing the volume of a gas results in a decrease in pressure
Molecules become more spread out- time between collisions decreases
Reduces rate of collisions
Force exerted on container decreases, resulting in a lower pressure
What can be said about the product of pressure and volume for a fixed mass of gas at a consent temp?
It is constant
What is the unit for pressure?
Pascal
What increases when you do work on a gas?
Internal energy of a gas
Increase of temperature
Why does temperature of air inside a bike pump increase when it’s pumped?
Work is done on gas
Increases its internal energy and increases kinetic energy of molecules
Temp increases with increase of kinetic energy
