Ideal and Real Gases

Question 1

What is the difference between the states of matter?

Answer 1

solid
- shape is independent of the shape of the container
liquid
- has a well defined surface
- fills the container and then forms a surface
gas
- fills the container that it occupies

Question 2

What is a fluid molecule?

Answer 2

molecules that have enough energy to overcome the attractive forces between them

Question 3

What type of force decides the state of matter of a substance?
intermolecular or intramolecular

Answer 3

intermolecular forces are the forces between molecules and they decide the state of matter of a substance

intermolecular bonds are weaker than intramolecular forces

Question 4

What is the gas equation for an ideal gas?

Answer 4

pV = nRT
p = pressure, Pa
V = volume, metre cubed 
n = mole
T = temperature, Kelvin

Question 5

What is the difference between ideal and real gases?

Answer 5

ideal gases have no molecular interactions
- move in random, straight line motion
- typical for low pressure = have high separation
real gases have intermolecular interactions
- have attractive and repulsive forces
- typical for high pressure = low separation

Question 6

What is Dalton’s law?

Answer 6

total pressure of a mixture is equal to the sum of the pressures exerted by the individual gases occupying the same volume alone (their partial pressure)

Question 7

What is the relationship between density and pressure?

Answer 7

density and pressure are directly proportional

- as one doubles the other also doubles