Hot Ice
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Hot Ice






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    Hot Ice Hot Ice Presentation Transcript

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