Behavior of Gases

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Behavior of Gases

• Chapter 3 Section 3

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Lets Review

• What is the definition of Volume?
• Amount of space something takes up
• What is the SI Unit for Volume?
• m3, but we also use cm3, mL, L
• What is the definition of Temperature?
• Average energy of motion of the particles of
  matter.
• Higher Temperature means??
• Faster the particles are moving
• What is the definition of Fluid Pressure?
• Total Force exerted by colliding particles over
  an area

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Gas Pressure

• Force of the gas particles divided by the area of
  the walls of the container.
• As Gas Particles increases in a confined
  container Pressure Increases
• 
  What would happen if
  you opened the container and provided more volume
  for the gas particles?
• The pressure would decrease!

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• Draw a picture of a Volleyball.
• Draw Label the Gas Molecules inside outside
  of the ball.
• Label where you think there is Higher Pressure
  and where you think there is Lower Pressure.

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Charless Law

• What happens to gas particles when temperature
  increases? The particles move
• If they move faster, they move farther apart,
  which means
• When the temperature of a gas is increased at a
  constant pressure, the volume ______________.
• When the temperature of a gas is decreased, the
  volume _____________.

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How do Hot Air Balloons fly?

• The volume of the hot air increases when the
  temperature increasesmaking it less dense than
  the air outside!

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Brain Break!

• With your partner, Create a riddle or analogy to
  help you remember Charless Law.

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Boyles Law

• When the pressure of a gas at a constant
  temperature is increased, the volume of the gas
  ____________.
• When the pressure of a gas is decreased, the
  volume of the gas _____________.
• http//www.chem.iastate.edu/group/Greenbowe/sectio
  ns/projectfolder/flashfiles/gaslaw/boyles_law_grap
  h.html

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Temperature Pressure

• As Temperature of a gas INCREASES at a constant
  volume, Pressure INCREASES
• Why?
• Particles move faster and collide more
  frequently, like sand particles on a windy beach.

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