Transcript Gas In A Syringe

Gas In A Syringe
Investigation
Begin the write up in your lab journal
Parts of Syringe
Draw and label a syringe in your lab journal
Syringe Body
Tip
Plunger
Gas Molecules
Activity #1
1. Remove the tip cap.
2. Pull the plunger all the way
back without separating the
pieces.
Tip cap
Notice a sound of moving air?
More gas molecules are entering
the syringe.
Now push the plunger closed
Hear and feel the air coming out?
That is gas molecules being
pushed out.
What have we learned?
• Weather happens in our
•
•
•
•
atmosphere
Air is Earth’s atmosphere
Molecules are 2 or more atoms
hooked together
The parts of a syringe
Proper use of a syringe
Write what you learned
What have we learned?
• Air is made of gas molecules
• Air can move
• We call moving air wind
Write what you learned
Activity #2
1. Replace the tip Cap on
the closed syringe
2. Try to pull the plunger out and
think about what is happening
1.Remove the tip cap from
the closed syringe
2. Now, pull the plunger out and
think about what is happening
What made the difference?
Air can be pulled into the
syringe with the cap off
but can’t with the cap on
A vacuum was formed and air
rushed in to fill the empty
space
Activity #3
1. Connect a tube to the end of
a syringe with the plunger pulled
out.
2. Connect the other end of the
tube to a syringe with the
plunger pushed all the way in
Syringe 1
Syringe 2
3. Draw and label your set up, do not move any parts
Write the following
Investigation Question: What will
happen if I push in the plunger?
Prediction: If I push the plunger
in on syringe #2, then __________
_______________________________
because_______________________
______________________________ .
Now try your prediction
Discuss what happened with your partner
Write a conclusion statement
Remember:
Answer the Investigation question.
What did you think would happen?
Was your hypothesis correct?
What really did happen?
Was your results the same as the other students?
Why does this happen?
What have we learned?
•Air takes up space
•Air has volume
•Volume means the amount of
space that something takes up
•Air will move into a new
space to equalize the pressure
Copy what we learned into your L.J.
Activity #4
1. Remove one syringe from the tube
2. Pinch the end of the tube shut
and try to push the plunger in.
What happens?
Discuss this with your partner
Syringe 1
Syringe 2
Air Pressure is always pushing on
everything in all directions.
Copy
notes
The greater the air pressure the
greater the push in all directions.
Pressure is a pushing force.
What have we learned?
•Air takes up space
•Air can be compressed into less
space (forced into smaller volume)
•Air has pressure
•The more you compress air the
higher the air pressure
Copy Notes
5 molecules
Not
Compressed,
Low pressure
5 molecules
Compressed,
High pressure
Air Pressure changes with
elevation
Elevation
Sea Level on Earth
Nitrogen 78%
Oxygen 21%
As you go up in
elevation the
number of gas
molecules
become less,
less compacted,
and there is less
air pressure
•Oxygen is 21% of the air
•Air is thinner the higher you go in
elevation
Do you
see any
problems
climbing
Mount
Everest?