Hot Ice

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Hot Ice

  1. 1. Hot Ice What’s the Problem with the Solution? The Scientists of Medaille Present
  2. 2. Hot Ice What’s the Problem with the Solution? The Mad Scientists of Medaille Present
  3. 3. Words to Know <ul><li>Freeze </li></ul><ul><li>Melt </li></ul><ul><li>Solvent </li></ul><ul><li>Solute </li></ul><ul><li>Saturated </li></ul><ul><li>Supercooled </li></ul><ul><li>Exothermic </li></ul><ul><li>Nucleation </li></ul>
  4. 4. Freeze <ul><li>To turn from a liquid into a solid. </li></ul><ul><li>Water freezes into ice at 0 o C or 32 o F </li></ul>
  5. 5. Melt <ul><li>To turn from a solid into a liquid. </li></ul><ul><li>Lead melts at 700 o C </li></ul><ul><li>Ice melts at 0 o C </li></ul>
  6. 6. Solutions SATURATED SOLUTION no more solute dissolves UNSATURATED SOLUTION more solute dissolves SUPERSATURATED SOLUTION becomes unstable, crystals form
  7. 7. Supercooled Liquid <ul><li>A liquid is supercooled if it is below its freezing point without becoming solid . </li></ul>
  8. 8. Exothermic <ul><li>An exothermic reaction releases heat. </li></ul><ul><li>It puts out heat </li></ul>
  9. 9. <ul><li>An endothermic reaction is one that gets cold. </li></ul><ul><li>It takes in heat </li></ul><ul><li>Salt and ice </li></ul>
  10. 10. Nucleation <ul><li>The beginning of a phase transition. </li></ul><ul><li>3 phases of matter: Solid, Liquid and Gas. </li></ul>
  11. 11. Today`s Experiment Making Hot Ice
  12. 12. How? <ul><li>Make solution using a special solvent and solute. </li></ul><ul><li>Supercool solution </li></ul><ul><li>Provide a nucleation point. </li></ul>
  13. 13. What Should Happen <ul><li>Observe phase change </li></ul><ul><li>It will freeze. </li></ul><ul><li>Exothermic: gets hot. </li></ul>
  14. 14. <ul><li>Sodium Acetate: NaCH 3 COO </li></ul><ul><li>Used in textile and rubber production </li></ul><ul><li>Vinegar flavoring agent </li></ul>Solute
  15. 15. <ul><li>Tasteless and odorless </li></ul><ul><li>Many industrial uses </li></ul><ul><li>Common food additive </li></ul><ul><li>Serious property damage </li></ul><ul><li>Injury & death </li></ul><ul><li>Dihydrogen monoxide </li></ul>Solvent
  16. 16. Lab Safety <ul><li>Eye protection </li></ul><ul><li>No loose clothes </li></ul><ul><li>Wash your hands </li></ul><ul><li>Don’t touch your eyes </li></ul><ul><li>No horse play. </li></ul>
  17. 17. Procedure <ul><li>1 l solvent to near boiling. </li></ul><ul><li>Add 800 g of solute. </li></ul><ul><li>Stir until dissolved. </li></ul><ul><li>Add solute until saturated </li></ul>
  18. 18. Procedure Continued <ul><li>Add solute ->no more will dissolve </li></ul><ul><li>Add solvent -> all is dissolved. </li></ul>
  19. 19. Procedure Continued <ul><li>Pour into clean container </li></ul><ul><li>Stand until cool </li></ul><ul><li>Pour into small containers for experimentation. </li></ul>
  20. 21. Remember This Guy? <ul><li>The same thing is going on with the water as with the sodium acetate! </li></ul>
  21. 22. <ul><li>The ice in the glass is providing a nucleation point for the water </li></ul>
  22. 23. <ul><li>Supercooled to below freezing (30 o F, or -2 o C) </li></ul><ul><li>Nucleation point </li></ul><ul><li>Phase change </li></ul><ul><li>Exothermic (32 o F, or 0 o C) </li></ul>
  23. 24. <ul><li>It’s just harder to do this with water because supercooled water is not as stable as the sodium acetate solution </li></ul>
  24. 25. Your Topic Goes Here <ul><li>Your subtopic goes here </li></ul>
  25. 26. Transitional Page
  26. 27. Your Topic Goes Here <ul><li>Your subtopic goes here </li></ul>
  27. 28. I’m a real caffeine molecule Elements Page

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