Banff Mountain Film Festival

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Banff Mountain Film Festival

• http//broadbandsports.com/node/24207
• http//www.youtube.com/watch?vBPN3gLVDsOY

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ECOSYSTEMS!
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Gas Solubility

• Learning goal we want to understand what
  happens to the solubility of gases at different
  temperatures.

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Pressure as the Temperature Varies
But what does this mean?
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(No Transcript)
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• How is gas solubility different from previous
  solubilities we looked at, like sugar?
• Why does a soda go flat after its been opened
  and gets warm? Express in terms of temperature
  and also pressure.
• How would you design a device that would prevent
  a bottle of soda from going flat after it is
  opened?
• List some gases that might be in river water.
• Trout thrive in a river temperature of less than
  15oC. Carp and catfish, however, can live in
  water slightly above 30o. Explain this in terms
  of how much dissolved oxygen each type of fish
  need to survive.
• Water that is used to cool power plants is often
  dumped back into a river. What effect might this
  invisible pollutant have on the aquatic life in
  the river?

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How do Gases behave in the atmosphere?How strong
is 1 atm of pressure?
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Gases in the Atmosphere

• Learning goal to understand the following about
  gases
• Changes in temp, pressure, vol.
• Ideal gases, Ideal Gas Law
• Absolute zero, Kelvin
• Very short quiz next block

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Gas animations

• To help simulate the behavior of gases in our
  world.
• Work today in class, and finish any remaining
  questions at home.
• If you get stuck, check out web links and notes
  on class site.

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Personalities of Gases!

• I have a sealed bag of Doritos, which has some
  air in it. What happens to the volume of air in
  it if I reduce the amount of pressure I put on
  it? Why?
• I filled up my bicycle tire with air on a very
  cold day. What happens to the volume of air in
  the tire on a much hotter day? What happens to
  the pressure? Why?

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Possible Answers

• I have a sealed bag of Doritos, which has some
  air in it. What happens to the volume of air in
  it if I reduce the amount of pressure I put on
  it? Why?
• Volume increases. The gas molecules expand into
  any volume theyre given.
• I filled up my bicycle tire with air on a very
  cold day. What happens to the volume of air in
  the tire on a much hotter day? What happens to
  the pressure? Why?
• The volume and pressure increase. The molecules
  move much faster and exert more pressure and vol.

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Things you can use for review

• Notes on gases
• Intro to gases ppt.
• Complete Gas Practice worksheet
• Complete Gas Simulations worksheet
• Gas animation website
• Try the pressure activity

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What do we know about Gases!

• Absolute Zero
• Ideal Gas Law
• Ideal Gas

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What do we know about Gases!

• Absolute Zero 0 K. Absolutely no energy in
  particles. No particle movement. -273.15 C.
  Not possible to get any colder, or any more of a
  lack of heat/energy. Only theoretical.
• Ideal Gas Law Ideal gases behave in this manner
  PV nRT
• Ideal Gas The Ideal Gas Law is only theoretical.
  It applies to gaseswhose particleshave no
  volume, and no intermolecular forces.

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Gases

• Demonstrate
• Fixed number of molecules of air
• Increase temperature -gt Volume? Pressure?
• Increase pressure -gt Volume?
• Decrease pressure -gt Volume?
• Decrease volume -gt Pressure?
• Increase volume -gt Pressure?

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Gases

• Boyles Law P1V 1 P2V2
• P1 Pressure during situation 1
• V1 Volume during situation 1
• P2 Pressure during situation 2
• V2 Volume during situation 2

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Try Sketching Graphs for

• Temp vs. Pressure
• Pressure vs. Volume
• Volume vs. Temp