Kinetic Theory

Question 1

List the 5 assumptions to the kinetic theory of gases

Answer 1

1) gases are made of tiny molecules that are very far apart (this is why they’re easily compressed)
2) molecules move in a straight line and have KE
3) the KE of a gas remains uniform as long as the temp and volume are constant (if KE is uniform, pressure is uniform)
4) the molecules have no attraction or repulsion for each other
5) KE=0.5mv^2 (each molecule has its own KE, the average KE is proportional to the temp because as KE increases temp increases)

Question 2

What is a gas that follows all 5 assumptions considered and called

Answer 2

Considered an ideal gas and noble gases are ideal

Question 3

Define KE

Answer 3

The energy of moving objects

Question 4

Explain the pressure of gases

Answer 4

The pressure of a gas is the effect of the gas hitting the walls of the container and pressure is uniform in all directions

Question 5

The pressure formula

Answer 5

P=force/area

Question 6

List the 4 parts of the kinetic theory of liquids

Answer 6

1) if temp of a gas drops, the velocity decreases and if attractive forces are strong enough, it will turn into a liquid.
2) molecules are held together by attractive forces, but still are able to move (can form to container)
3) liquids can only be slightly compressed
4) molecular movement prevents liquids from having a fixed shape

Question 7

Evaporation definition and information

Answer 7

Liquid turning into a gas at below boiling point. It happens at the surface of a liquid and the molecules with greatest KE evaporate first (average KE decreases, causing temp to decrease)

Question 8

3 ways to increase evaporation

Answer 8

Increase temp, increase surface area, create air current over liquid