1.4

Question 1

true or false: gas particle will move in a straight line until it collides with another particle thus changing direction (random movement); (Newton’s first law)

Answer 1

true

Question 2

What does the ideal gas model(it is limited) assume?

• must be at room temperature
• at sea level

Answer 2

• particles in constant, random, straight line motion
• collisions are elastic (total KE constant); meaning the gas particles are not losing energy as a sample
• particles are tiny points with mass but no volume and far apart (meaning mostly empty space; volume negligible)
• no attractions/ repulsions between particles or for walls of containers (assume gas particles do not clump together); in reality all particles experience an electrostatic force of attraction

Question 3

What is the most ideal gas?

Answer 3

Helium (He)

Question 4

What are the non ideal gas conditions?

Answer 4

• low temperature
• high pressure
• particle size significant compared to space between particles
• interactions between particles are significant

Question 5

Can the behavior of gases be predicted for non ideal gas conditions, and can the ideal gas law equation still be used?

Answer 5

No for both

Question 6

What are real gases?

Answer 6

• molecules have REAL VOLUME (not points of mass)
  -molecules are attracted to others by intermolecular forces
  (volume & attraction)

Question 7

true or false: for the ideal gas law does PV/RT = 1

Answer 7

true

Question 8

Why how do the non ideal conditions for real gases deviate from the ideal gas law?

Answer 8

Conditions: low T and High P thus
-Attractions: as the particle collides with the wall of the container; if there are other neighbors around the particles as it collides with the wall, it will experience attraction backwards( in reality the pressure would be a lot less than the ideal gas law would predict)

-At very high pressure: We find that free space is actually a lot less than measured volume ( when we think of the volume of the gas sample, we are measuring the inside of the container assuming most is EMPTY SPACE)

Question 9

Which equation must be used rather than the ideal gas law, and why?

Answer 9

The van der waals equation

- this is because it takes these factors that real gases exhibit into account (volume and attraction)

Question 10

true or false; as the T increases, gases will return back to ideal gas behavior?

Answer 10

true