Dry Ice Lab

1
Dry Ice Lab

• Purpose Observe changes in state from solid to
  gas.

2
Background

• Dry ice is carbon dioxide in its solid state.
• Rememberdry ice sublimates instead of melting.
• Carbon dioxide is found in
• the earth's atmosphere
• Humans exhale carbon
• dioxide gas and plants
• use it for photosynthesis.
• Carbon dioxide is a colorless,
• odorless, and tasteless compound.
• Dry ice is -78 degrees Celsius (-109 degrees
  Fahrenheit)

On your lab report Summarize at least 2 facts
about dry ice using your own words. Define
sublimation
3
Safety For Dry Ice Lab

• Do NOT touch dry ice with your bare hands, it can
  damage your skin. Dry ice will BURN exposed
  skin!!!
• Use the plastic tongs to touch and move the dry
  ice.
• Wear your safety gear aprons and goggles
• Long hair must be
• pulled back.
• Do NOT inhale
• the gas.

4
Safety (cont.)

• Use caution when lighting the candle.
• Make sure the area you work in is well
  ventilated. Do NOT close the doors.
• Do not place dry ice or dry ice and water in a
  sealed plastic bottle or thin glass bottle. It
  will explode. People can be severely injured. It
  is against the law and it is a felony.

5
Divide your paper into 4 sections

• Each individual lab within this activity has its
  own procedure. We will step through these as a
  class using this presentation. No one is allowed
  to move ahead until we are all ready.
• In each section record
• Hypothesis (if, then format)
• Observations (answer questions)
• I dont know is not an acceptable answer. Make an
  educated guess.

6
Hypotheses and Observations
Experiment 1 H If I touch dry ice to metal, then O What? Why? Experiment 2 H If I put a flame next to dry ice, then O What? Why?
Experiment 3 H If I put dry ice in warm water, then O What? Why? Experiment 4 H If I put dry ice in warm soapy water, then O What? Why?
7
Experiment 1 Screaming Metal

• Materials lab spoon, Petri dish, dry ice.
• Procedure Place the metal spoon against the dry
  ice in the Petri dish.
• Be careful not to let the spoon get too cold, you
  could get frost bite.
• Results What happens? Why do you think this
  happens?

8
Experiment 2- Magic Fire Extinguisher

• Materials beaker, dry ice, match, candle, clay,
  small pie tin.
• Procedure Place the dry ice in your beaker.
  Light the match and light the candle. Place the
  candle near the dry ice.
• Results What happens? Why do you think this
  happened?

9
Experiment 3 Spooky Fog

• Materials 100 ml of hot water , glass beaker,
  dry ice.
• Procedure Place 100 ml of hot water into the
  beaker. Add some dry ice.
• Results What happens? Why do you think this
  happens?

10
Experiment 4 Soap Ooze

• Materials the spooky fog, 10 ml of liquid soap.
• Procedure Add the10 ml of soap to the spooky fog
  experiment.
• Results What happens? Why do you think this
  happened?

11
Clean Up

• Clean out the beaker really well so that its not
  soapy for the next period
• Dry off the trays
• Put lab trays back on the counter

12
Conclusion Address the following questions
using paragraph format

1. What is sublimation and how is it different from
   melting?
2. What is needed to cause a substance to sublimate?
3. Where is the thermal energy coming from to cause
   the dry ice to sublimate?
4. Is sublimation a physical or chemical change?
   Explain your answer.