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Kinetic-Molecular Theory

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Kinetic-Molecular Theory Chapter 14 Models Scientists use models because are simpler than real life Kinetic-molecular theory can be extended to all phases of matter ... – PowerPoint PPT presentation

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Title: Kinetic-Molecular Theory


1
Kinetic-Molecular Theory
  • Chapter 14

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

3
Kinetic-Molecular Theory (KMT)
  • 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

4
Kinetic-Molecular Theory
  • 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

5
Kinetic-Molecular Theory
  • 3) Gas molecules separated by great distances
    that volume of molecule is negligible
  • distance between molecules is more important than
    actual size of molecule

6
Kinetic-Molecular Theory
  • 4) Gas molecules do not attract or repel each
    other
  • Assume there are no interactions between gas
    molecules

7
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

8
Review of KMT
  • What features of the Kinetic-Molecular model are
    close to real gases?
  • What features of the Kinetic-Molecular model
    break down?
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