2. Hot Ice What’s the Problem with the Solution? The Scientists of Medaille Present

3. Hot Ice What’s the Problem with the Solution? The Mad Scientists of Medaille Present

4. Words to Know Freeze Melt Solvent Solute Saturated Supercooled Exothermic Nucleation

5. Freeze To turn from a liquid into a solid. Water freezes into ice at 0 o C or 32 o F

6. Melt To turn from a solid into a liquid. Lead melts at 700 o C Ice melts at 0 o C

7. Solutions SATURATED SOLUTION no more solute dissolves UNSATURATED SOLUTION more solute dissolves SUPERSATURATED SOLUTION becomes unstable, crystals form

8. Supercooled Liquid A liquid is supercooled if it is below its freezing point without becoming solid.

9. Exothermic An exothermic reaction releases heat. It puts out heat

10. An endothermic reaction is one that gets cold. It takes in heat Salt and ice

11. Nucleation The beginning of a phase transition. 3 phases of matter: Solid, Liquid and Gas.

12. Today`s Experiment Making Hot Ice

13. How? Make solution using a special solvent and solute. Supercool solution Provide a nucleation point.

14. What Should Happen Observe phase change It will freeze. Exothermic: gets hot.

15. Sodium Acetate: NaCH 3 COO Used in textile and rubber production Vinegar flavoring agent Solute

16. Tasteless and odorless Many industrial uses Common food additive Serious property damage Injury & death Dihydrogen monoxide Solvent

17. Lab Safety Eye protection No loose clothes Wash your hands Don’t touch your eyes No horse play.

18. Procedure 1 l solvent to near boiling. Add 800 g of solute. Stir until dissolved. Add solute until saturated

19. Procedure Continued Add solute →no more will dissolve Add solvent → all is dissolved.

20. Procedure Continued Pour into clean container Stand until cool Pour into small containers for experimentation.

22. Remember This Guy? The same thing is going on with the water as with the sodium acetate!

23. The ice in the glass is providing a nucleation point for the water

24. Supercooled to below freezing (30 o F, or -2 o C) Nucleation point Phase change Exothermic (32 o F, or 0 o C)

25. It’s just harder to do this with water because supercooled water is not as stable as the sodium acetate solution

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