Dry Ice Lab
Background: Dry ice is made of solid carbon
dioxide (CO2). The same
compound that you breathing out at this very moment. It is far colder than water ice which freezes
at 0°C, dry
ice freezes at -78.5°C (-110°F).
Dry ice is used to ship food through the mail or to keep items cold
where there is not a refrigerator.
Preparation
Questions:
1. Taste the apple juice. How does it taste, be as descriptive as
possible.
Observe dry ice:
3. Make observations about what happens
to the dry ice as it is left at your table.
4. Make at least three observations
about how it is different from water ice.
5. When a metal object is placed on the
dry ice what occurs? Compare this to what happens when you stretch out the opening
of a latex balloon to make the opening very small.
6. What happens when dry ice is placed
in cup with plastic wrap on top? Why
does this happen?
7. Pour the dry ice vapor over the lit
candle. What happens to the candle? Explain why this happens.
Dry ice in water:
8. What happens when dry ice is placed
in warm water? Is this a physical or chemical change, explain why.
9. Is the water boiling? What are the bubbles going up in the cup?
10. When “steam” comes out of the
beaker, it goes down instead of up like steam from a pot of boiling water. Why do you think this happens? (Hint: think
about what you know about density!)
11. Observe the dry ice after it has
been in the water for a long period of time.
What happens to the dry ice?
Dry ice in soapy
water:
12. What happens when dry ice is placed
in the soapy water.
13. Feel the bubbles from the dry ice in
soapy water. How do they feel different
from regular bubbles?
14. What observations can you make when you pop
the bubbles?
Apple juice &
dry ice:
15. Drink the apple juice after the dry
ice has disappeared. Does it taste any
different?
16. Does it remind you of anything else
that you drink? Compare it to other beverages that you have drank. Do you think
this is a physical or chemical change? Explain why.
Questions:
19. Draw the cycle of the changes of
state of matter. What is the name of the
change that is happening to the dry ice? Is it losing or gaining energy? Is
this a physical or chemical change, explain.
20. Explain why the dry ice changed rapidly
when it was placed in hot water. Think about the energy change that occurred.
21. How is dry ice different from water
ice? Explain at least three differences.
22. Did the dry ice float or sink in the
water? How does this compare to water
ice? Which one is less dense/more dense?
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