1. COOL ICE DR SAADOUNE

2. Dr Saadoune a b c direction 100 Å Helix pitch: 50 Å

3. They may look similar !!! But they are different !! SolidLiquidGas0 100 T o C Freezing point Boiling point Water GasSolid0 -78 T o C Carbon Dioxide Sublimation point

4. Experiment 1 Singing Spoon First dip the metal spoon into warm water. Then hold the warm spoon by its handle, and press it firmly against a chunk of dry ice. What do you observe happening? Experiment 2 Fog Effects Use a plastic forceps (not your hands) to place two-three pieces of dry ice into warm water. What do you observe happening? Can you suggest an explanation? Experiment 3 Cool glove !! Place some pieces of dry ice into a thin latex glove. Tie off the end of the glove, shake it gently. What is happening? Explain using your ideas about sublimation. Experiment 4 Super bubbles!!! In you beaker, place some warm water and one drop of a detergent, mix them well with a spoon. Now add one spoon full of dry ice into the beaker. What do you see happening ? Must wear safety goggles all the time. Must be standing all the time. Do not touch dry ice with your hands (use a plastic forceps) Hot objects

5. Let’s make a fizzy drink !!?

6. Carbon Dioxide Chemistry Higher carbon dioxide levels Less shells Lower carbon dioxide levels More shells Results are still inconclusive

7. A D B C Changing State Which box represents which state? What are the changes between the different states called? Do you know all 4? ?

8. In your books summarise the four experiments you carried out Experiment NoObservationExplanation Keywords: Sublimation, heat energy, carbon dioxide, particles, vibration