# TOPIC: Kinetic-Molecular Theory (KMT) - PowerPoint PPT Presentation

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## TOPIC: Kinetic-Molecular Theory (KMT)

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### TOPIC: Kinetic-Molecular Theory (KMT) Do Now: packet page __ Relationship between Temp and Average Kinetic Energy Models Scientists use models because simpler than ... – PowerPoint PPT presentation

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Title: TOPIC: Kinetic-Molecular Theory (KMT)

1
TOPIC Kinetic-Molecular Theory (KMT)
• Do Now packet page __
• Relationship between Temp and Average Kinetic
Energy

2
Models
• Scientists use models because simpler than real
life
• Kinetic-molecular theory can be extended to all
phases of matter

3
Kinetic-Molecular Theory (KMT) as it pertains to
ideal gases
• There are 4 assumptions to the KMT

4
Real vs. ideal gas
• Ideal gas obeys assumptions of KMT all the time
• Its a model
• It doesnt exist
• Real gases follow KMT most of time, but not at
high pressure low temperature
• KMT breaks down when molecules are close together

5
• 1) Gases consist of spherical molecules moving
in constant, random, straight-line motion
• Random, straight-line?
• - move in straight
• lines until hit
• something, then can
• bounce
• off at any angle

6
• 2) Gas particles undergo elastic collisions
with each other and with walls of container
• Elastic means total KE is conserved
• KE does not get converted to heat or sound or any
other kind of energy
• KE can be transferred between particles

7
• 3) Gas molecules separated by such great
distances that the volume of molecule is
negligible (not significant)
• Ideal gasses are considered not to have volume,
but they still have a mass, so scientists call
this a point mass

8
• Gas molecules do not attract or repel each other

9
• Real gases do interact with one anotherthats
why water vapor condenses

Intermolecular forces
10
Ideal vs Real
• Real ( at high pressure low temperature)
• Particles take up space (they have volume)
• All gas particles are subject to intermolecular
interactions
• Ideal
• Particles themselves take up no space
• Particles have no intermolecular forces

11
Example N2(g)
• At a low temperature, the kinetic energy is

low, which means their intermolecular forces are
strong enough to hold them together Nitrogen gas
become liquid Nitrogen
12
Propane
If you increase the pressure, the volume
decreases, which forces particles closer
together. They will become a liquid
13