Kaupapa: 25 / 05 Thursday Define “sublimation”

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Presentation transcript:

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

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?

The Three Physical States of Matter

Evaporation Melting Freezing Condensation Sublimation Deposition

Sublimation (e.g. Iodine Crystals)

1,4-dichlorobenzene

DRY ICE

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

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

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

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