Compressing Gases

1
Compressing Gases

• Gases hold huge amounts of energy, and their
  molecules are spread out as much as possible.
  With very little pressure, when compared to
  liquids and solids, those molecules can be
  compressed. It happens all of the time.
  Combinations of pressure and decreasing
  temperature force gases into tubes that we use
  every day. You might see compressed air in a
  spray bottle or feel the carbon dioxide rush out
  of a can of soda. Those are both examples of gas
  forced into a smaller space than it would want,
  and the gas escapes the first chance it gets. The
  gas molecules move from an area of high pressure
  to one of low pressure.

2
Lesson Frame

• I can analyze how trapped gas reacts when
  temperature, volume or pressure are changed.
• I will observe several different situations and
  determine which variables are changing and how
  they are changing.
• I will have mastered this when I can identify gas
  laws based on how the variables are changing.

3
Gas Laws

• At each lab station that you work at today, a
  gas (air) will be trapped in various types of
  containers. It will be your job to analyze how
  the trapped gas reacts when pressure, volume, and
  temperature are changed.

4
Demonstration  Nice shot Spud!

• Observe the demonstration.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations.

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
5
Station 1    Life in a Vacuum!

• Instructions
• Place a mini marshmallow into the vacuum
  chamber" and push the plunger down so that it
  stops just above the marshmallow. Wrap the
  plastic wrap around the open end. Place your
  finger over the open end and slowly pull the
  plunger out while observing the marshmallow.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations.

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
6
Station 2     The Cartesian Diver

• Instructions
• The "diver" is the dropper which is inside the
  large plastic bottle. Note the position of the
  diver inside the bottle as the bottle sits on the
  table. Squeeze and release the bottle.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations.

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
7
Station 3    Ivory Soap Flower

• Instructions
• Place a chunk of Ivory soap on a paper plate and
  place in the microwave. Turn on the microwave for
  1-2 minutes.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations.

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
8
Station 4You Can Do it!

• Instructions
• Place 5 ml of water in the can. Heat on hot plate
  until steam begins to escape then quickly place
  in the ice bath.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations. 

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
9
Station 5 Balloon and the Flask (or Hot Air
Ballooning)

• Instructions
• Pull a balloon over a flask with 5ml of water in
  it.
• Place on a hot plate and observe the balloon.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations.

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
10
Station 6 Balloon and the Flask (or Hot Air
Ballooning)

• Instructions
• Pull a balloon over a flask with 5ml of water in
  it.
• Place in an ice bath and observe the balloon.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations.

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
11
Station 7  Super Duster Office Buster

• Instructions
• Wrap your hand around one of the duster cans. 
  Make sure your palm is in complete contact with
  the can. Now, depress the nozzle.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations.

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
12
Station 8 Balloon in a bottle!

• Instructions
• Start the paper on fire and carefully drop it
  into the flask. Quickly place the water balloon
  on top and observe. Use the straw to help remove
  the balloon.
• Determine whether or not the pressure, volume,
  and temperature is increasing, decreasing or
  staying the same and record the data in your
  journal.
• Write a paragraph to describe your observations.

Pressure Volume Temper-ature
Increase, decrease, same
Gas Law
13
Rising Water

• Why did the green water rise in the graduated
  cylinder after the candle flame went out?
• What happened to the temp inside the graduated
  cylinder because of the flame?
• How did that affect the volume?
• After the flame went out the temp ____?
• The volume of the gas in the graduated cylinder
  ______?
• This resulted in a decrease in the ________
  inside the graduated cylinder.
• The pressure (atmospheric) on the water in the
  pan was greater and that forced the water to rise
  in the cylinder.

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Example Test Questions
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