Hot Ice What’s the Problem with the Solution? The Scientists of Medaille Present.
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Transcript of Hot Ice What’s the Problem with the Solution? The Scientists of Medaille Present.
![Page 1: Hot Ice What’s the Problem with the Solution? The Scientists of Medaille Present.](https://reader036.fdocuments.in/reader036/viewer/2022062307/551ad09d5503466b6a8b5423/html5/thumbnails/1.jpg)
Hot IceWhat’s the Problem with the Solution?
The Scientists of Medaille PresentThe Scientists of Medaille Present
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Hot IceWhat’s the Problem with the
Solution?
The Mad Scientists of Medaille Present
The Mad Scientists of Medaille Present
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Word
s t
o
Kn
ow • Freeze
• Melt• Solvent• Solute
• Saturated• Supercooled• Exothermic• Nucleation
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Freeze
• To turn from a liquid into a solid.
• Water freezes into ice at 0o C or 32o F
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Melt• To turn from a solid into a liquid.
• Lead melts at 700o C
• Ice melts at 0o C
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SolutionsSATURATED SOLUTION
no more solute dissolves
UNSATURATED SOLUTIONmore solute
dissolves
SUPERSATURATED SOLUTION
becomes unstable, crystals form
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Supercooled Liquid
• A liquid is supercooled if it is below its freezing point without becoming solid.
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Exoth
erm
ic• An exothermic reaction releases
heat. • It puts out heat
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• An endothermic reaction is one that gets cold.
• It takes in heat• Salt and ice
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Nu
cle
ati
on • The beginning of a phase
transition.
• 3 phases of matter: Solid, Liquid and Gas.
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Today`s Experiment
Making Hot Ice
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How
? • Make solution using a special solvent and solute.
• Supercool solution• Provide a nucleation point.
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What Should Happen
• Observe phase change
• It will freeze.
• Exothermic: gets hot.
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• Sodium Acetate: NaCH3COO
• Used in textile and rubber production
• Vinegar flavoring agent
Solu
te
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• Tasteless and odorless
• Many industrial uses
• Common food additive
• Serious property damage
• Injury & death
• Dihydrogen monoxide
Solv
en
t
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Lab
Safe
ty• Eye protection
• No loose clothes
• Wash your hands
• Don’t touch your eyes
• No horse play.
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Procedure
• 1 l solvent to near boiling.
• Add 800 g of solute.
• Stir until dissolved.
• Add solute until saturated
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Procedure Continued
• Add solute →no more will dissolve
• Add solvent → all is dissolved.
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Procedure Continued
• Pour into clean container
• Stand until cool
• Pour into small containers for experimentation.
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Remember This Guy?• The same
thing is going on with the water as with the sodium acetate!
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• The ice in the glass is providing a nucleation point for the water
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• Supercooled to below freezing (30o F, or -2o C)
• Nucleation point• Phase change• Exothermic (32o F, or
0o C)
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• 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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Your Topic Goes Here• Your subtopic goes here
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Transitional PageTransitional Page
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Your Topic Goes Here• Your subtopic goes here
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