1. Kaupapa: 25 / 05 Thursday Define “sublimation”
Observe sublimation and properties of dry ice

2. Do you remember?
Describe the difference between a chemical change and a physical change
What are the some things you can observe in chemical changes?

3. The Three Physical States of Matter

4. Evaporation
Melting
Freezing
Condensation
Sublimation
Deposition

5. Sublimation
(e.g. Iodine Crystals)

6. 1,4-dichlorobenzene

7. DRY ICE

8. Observing Dry Ice What does it look like? What does it feel like?
What does it sound like?

9. Dry Ice Investigation Inflate a balloon Make it scream
Make a big bubble
Extinguish fire
Make an acidic solution

10. Demos! Freeze a soap bubble Put them into hot water
Make a dry ice bomb

11. What have we learnt today?
What is dry ice made of?
Why does dry ice feel so cold?