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Hot IceWhat’s the Problem with the Solution?
The Scientists of Medaille PresentThe Scientists of Medaille Present
Hot IceWhat’s the Problem with the
Solution?
The Mad Scientists of Medaille Present
The Mad Scientists of Medaille Present
Word
s t
o
Kn
ow • Freeze
• Melt• Solvent• Solute
• Saturated• Supercooled• Exothermic• Nucleation
Freeze
• To turn from a liquid into a solid.
• Water freezes into ice at 0o C or 32o F
Melt• To turn from a solid into a liquid.
• Lead melts at 700o C
• Ice melts at 0o C
SolutionsSATURATED SOLUTION
no more solute dissolves
UNSATURATED SOLUTIONmore solute
dissolves
SUPERSATURATED SOLUTION
becomes unstable, crystals form
Supercooled Liquid
• A liquid is supercooled if it is below its freezing point without becoming solid.
Exoth
erm
ic• An exothermic reaction releases
heat. • It puts out heat
• An endothermic reaction is one that gets cold.
• It takes in heat• Salt and ice
Nu
cle
ati
on • 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: NaCH3COO
• Used in textile and rubber production
• Vinegar flavoring agent
Solu
te
• Tasteless and odorless
• Many industrial uses
• Common food additive
• Serious property damage
• Injury & death
• Dihydrogen monoxide
Solv
en
t
Lab
Safe
ty• 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 (30o F, or -2o C)
• Nucleation point• Phase change• Exothermic (32o F, or
0o 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 PageTransitional Page
Your Topic Goes Here• Your subtopic goes here
I’m a real caffeine molecule
Elements Page