4.3 Gases

Question 1

List the 5 properties of gases

Answer 1

No definite shape/volume
Compressible
Rapidly diffuses
Low density
Exerts pressure

Question 2

What is the model for matter?

Answer 2

Matter is made up of small particles called atoms or molecules which r always moving

Question 3

What is the KMT of gases? Give two points

Answer 3

Kinetic molecular theory. Regards ideal gases
– Have small particles (atoms/molecules) far apart in relation to their own size
– particles move in rapid, random, straight motion
– collisions r elastic; no loss of energy
– no attractive forces within
– all particles dont have the same KE. The average KE is proportional to temp.

Question 4

Increasing the temp of a gas will __ the velocity of the gas molecules

Answer 4

increase

Question 5

Why does the fixed size of a container increase its pressure?

Answer 5

– the faster molecules will collide w/ sides w/ more energy
– more collisions per second

Question 6

Define molar volume

Answer 6

the volume occupied by a mole of gas molecules. – Depends on temp and pressure

Question 7

How does temp and pressure affect molar volume?

Answer 7

– temp increase, MV increase
– pressure increase, MV decrease

Question 8

What temp is STP and SATP

Answer 8

0 degrees Celsius; 25 degrees Celcius

Question 9

What is the molar volume at STP and SATP?

Answer 9

22.4 L/mol ; 24.8 L/mol