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gapingthingsUrban and Civil

Nov 15, 2013 (3 years and 6 months ago)

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http://sites.jmu.edu/chemdemo

JMU

Departmen
t of Chemistry and Biochemistry

CO
2

Bubbles

DESCRIPTION:


CO
2

gas from subliming dry ice gets caught in a soapy solution creating a column of
bubbles.

When the bubbles are popped, the “fog” that we see is condensed water
vapor, not carbon dioxide gas.

TOPICS COVERED:

-

cryogenic
s

-

sublimation

-

condensation

-

physical change

MATERIALS NEEDED:

-

250 mL graduated cylinder

-

dry ice

-

water

-

dish liquid

-

tray for the graduated cylinder

-

stir rod

-

food coloring (optional)

PROCEDURE:

1. Place the graduated cylinder in a tray to catch bubble overflow

2. Put a few drops of food coloring in the bottom of the graduated cylinder

3. Line the inside top wall o
f the graduated cylinder with dish soap

4. Fill the graduated cylinder most of the way full with warm water

5. Add dry ice chunks,

ADDITIONAL COMMENTS:

A little food coloring makes it easy to see where the liquid and bubbles in the cylinder
separate. Usi
ng a stirring rod to submerge the dry ice into the water causes more
bubbles to come out quicker.

SAFETY:


Dry ice is a cryogenic that causes bad burns and should never be handled with bare
skin. Caution should be taken and goggles worn at all times.

REF
ERENCES:


Awesome Dry Ice Experiments
.”

Steve Spangler Science.

Accessed 15 Jul 2011.
<
http://www.stevespanglerscience.com/experiment/awesome
-
dry
-
ice
-
experiments
>