P3: GAS PRESSURE

Question 1

Describe the motion of particles in a gas

Answer 1

particles in a gas move very quickly in random directions

Question 2

What is gas pressure?

Answer 2

the total force exerted by all the particles over the area of the container

Question 3

Pressure equation

Answer 3

pressure (Pa or N/m^2) = force (N) / area (m^2) (p = F/a)

Question 4

What’s the relationship between pressure and volume?

Answer 4

-inversely proportional
-for a fixed mass of gas at a constant temperature:
pressure (Pa) × volume (m^3) = constant (pV = constant)

Question 5

How can you increase pressure of a gas?

Answer 5

-increasing temp.
-increasing no. of particles
-decreasing volume of container

Question 6

Why does increasing temp increase gas pressure?

Answer 6

-as temp increases particles gain kinetic energy
-therefore they move at higher speeds
-this causes more collisions between the particles and the walls of the container
-more collisions = greater force meaning an increase in pressure