Gas Production Lab

1
Gas Production Lab

• We have already seen a few of the signs or
  evidence of a chemical change. The Magic Color
  lab showed us permanent color change and the
  Curds and Whey lab showed us two liquids can form
  a solid.

2
Remember the signs of gas production?

• Bubbling
• Foaming
• Fizzing
• Or sometimes a smell is produced.

3
Safety First

• You will need to wear your goggles. You also
  need to be very aware of where your body is. DO
  NOT PLACE YOUR FACE OVER THE FILM CANSITER OR
  POINT IT AT ANYONE!

4
Journaling

• Title Gas production
• Guiding Question What evidence do you see to
  support a chemical change?
• Chart

I notice. I wonder.

5
Step 1

• Examine your supplies and write a description of
  each in the I notice column.
• Alka seltzer Tablet (Citric Acid C6H8O7 and
  Sodium Bicarbonate or baking soda 3NaHCO3 )
• Water (H2O)
• Film Canister

6
The Film Canister

• During this lab you will need to place some water
  in the canister, drop in ¼ of an alkaseltzer
  table, then you need to close the canister
  securely and place it lid side down. YOU MUST
  CLOSE IT SECURELY!

7
Step 2

• Make a before drawing of the materials.
• Break the tablet into 4ths.
• Fill the canister ½ full with water.
• Drop ¼ of a tablet into the canister and seal it
  tightly.
• Turn it lid side down on the table and get out of
  the way.
• Record you observations in the journal and draw a
  picture of the canister before and after.

8
Whats going on in there?

• Fill the canister again ½ full of water.
• Place ¼ of the alka seltzer tablet into the water
  but dont put the lid on.
• Record your observation in your I notice column.
• Make a drawing to show what is happening inside
  the canister.

9
Step 3

• You can use the remaining 2 tablet pieces to take
  your experiment a step further.
• Write down what you plan to do with them in the I
  wonder column and then do it.
• Be sure to record your observations in your
  chart, but draw a line to separate the original
  observations from this set of observations.

10
Clean Up

• Pour all the liquid down the drain and wipe up
  any liquid that is on the table.
• Rinse out the canister and return it to the
  bucket.

11
What happened?

• The water (H2O) reacts with the Citric Acid
  C6H8O7 and Sodium Bicarbonate or baking soda
  3NaHCO3 ) forming a gas.

12
Conclusion

• Write a sentence describing the evidence you saw
  that proves what occurred was a chemical change.

13
One step farther.

• Look back at the materials. What do you think
  gas do you think was released during this lab?
• Write a sentence to explain what gas you think it
  was.