Investigation 3 Part 2Focus Questions 9-25-09- Enter

this page in your TOC and in your notebook. Write the questions

and your responses.1. What is air?

2. How do you know something is a gas?

3. Is air matter?

How Much Gas ? Investigation 3Wrapping up Tuesday’s Lab

1. What caused the syringe plunger to go up during the reaction?

2. Why is a syringe more useful than a balloon?

3. What do you think will happen if you doubled the amount of citric acid? Predict

4. What do you think might happen if you doubled the amount of sodium

bicarbonate?

Discussion of Investigation 3

• Class Data

• How much gas?

• Volume?• Units in

mL

L1 T1 T2 T3 Aver

L2

L3

L4

L5

L6

L7

L8

Investigation 3 Data 4th hr

L1 T1 T2 T3 Aver

L2

L3

L4

L5

L6

L7

L8

Investigation 3 Part 1 5th hr

L1 T1 T2 T3 Aver

L2

L3

L4

L5

L6

L7

L8

Investigation 3 Hr 6

L1 T1 T2 T3 Aver

L2

L3

L4

L5

L6

L7

L8

Investigation 3 Hr 7

L1 T1 T2 T3 Aver

L2

L3

L4

L5

L6

L7

L8

Teacher Demonstration Inves 3 Part 3-

• How can you show that gas is matterHow can you show that gas is matter? Watch this demonstration ! Record the results in your ISN

• Draw the Demonstration

• List materials

• What will happen if I air up this ball?– Make a prediction !!

• Give an explanation of what happened

Explain what happened

• Higher mass from the beginning of the experiment means that the air has mass and takes up space so gas does have matter !

Free exploration with Syringes

• Syringe, Tube, Clip, Fork- goggles today

• Rules: Don’t point at anyone in class.• Not a toy !!• Don’t pop or break air bubbles• Return everything in same

condition…otherwise you get to buy a new one for class !

What happens when you push on syringe?

• Watch set up of the teacher and then make the same set up at your lab station.

• Use the fork to get the tubing off

• Use the clip to stop the air

Discuss What Happened

• What happened when you tried to push or pull on the syringe?

• What did you see?

• Record your observationsobservations in your ISN !

What happened

• Air Air is made of tiny particles that are in constant motion

• The popping of the syringe when you pull the gray portion out is what happens when you lower the air pressure, you get a vibration and the noise is the air going back into the syringe.

What happens when you push the syringe inin ?

• What is happening to the air?• What is happening to the number

of air particles?• What is happening to the size of

the air particles?• What is happening to the space

between the air particles?• Write your answers in your ISN

What happens when you pull the gray part of the syringe out?

• What is happening to the air inside the syringe?

• What is happening to the number of particles of air inside of the syringe?

• Are the air particles getting bigger or smaller?

• What is happening to the space between the air particles ?

• Write your answers in your ISN

Compression• When you push air particles together

• Same number of particles still there

• Same size of particles still there

• Air particles are closer together so the space between the particles is less

• When you push the syringe in

ExpansionWhen air particles have more

space between them

Same number of air particles

Same size of air particles

Air particles spread out

Discuss Air as Particles

• PredictPredict what will happen if we put pink bubble wrap inside the syringe in push the syringe in? What will happen to the bubble? (write in your ISN)

• PredictPredict what will happen if we put pink bubble wrap inside a syringe and then pull the syringe out? What will happen to the bubble? (Write in your ISN)

Do not pop the bubble wrap !

• Record your observations about the pink bubble wrap in your own table !

Space between particles

Term to use

Number of air particles in bubble wrap

Size of air particles inside the wrap

What did you see happen?

Push in Push in SyringeSyringe

Pull out the Pull out the syringesyringe

Put the bubble wrap back in your container

• Prediction:Prediction: What will happen to this blue cube when I push the syringe in?

• Prediction:Prediction: What will happen to this gray cube when I push the syringe in?

• Write your predictions in your TOC.

Make a Table of Your Observations

Observation Push in syringe

Pull out syringe

Notes: Why did this happen ?

Blue Cube

Gray Cube

Results:

• Blue cube-Blue cube- when you compress/squish down the syringe the blue cube gets smaller inside the syringe.

• Grey cube-Grey cube- made of foam and doesn’t compress because there are holes so the particles can equalize.

• No matter what you do …the air in the blue cube has trapped particles- the cube responds differently because of its structure

Results

• The grey cube- equilibrium happens so the number of air particles even out.

• Air in A Syringe- A

• Fill out the picture on this page.

• Make an entry in your TOC

• Be sure to check how many dots, size of dots and how you are spacing your dots.

Main Ideas

• Gas is a form of matter.• Gas may have mass and occupy space• Gas is made of individual particles that

are not connected to other particles• Gas particles are relatively far apart

and in constant motion

Main Ideas from Investigation 3

• You can measure volume of gas with syringe.

• Compression- air particles pushed closer together. Same number of air particles, same size of air particles.

• Expansion- air particles are moving further apart. Same number of air particles, same size of air particles.

Reading Assignment p. 16 after syringe activity

• Read and answer questions