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======Freezing Flowers With Dry Ice and Alcohol======


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/* GREY BOX INFORMATION - Required                                                                     */
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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:** Poor man's Liquid Nitrogen
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====Summary====                   
{{$demo.summary}}


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/* PROCEDURE - Optional                                                                                */
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====Procedure====  
  - Place chunks of dry ice into a pyrex glass or metal container.
  - Carefully pour in isopropyl alcohol until the dry ice is submerged.
  - Wait briefly as the liquid temperature rapidly drops.
  - Using tongs, dip a flower into the mixture for about one minute, then remove and crush it with a hammer, it will shatter like glass.
  - Repeat with candy or a banana and observe how they harden into stone-like solids.


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====Links==== 
Dry ice: extreme freeze - MEL Chemistry: 
{{youtube>8urPAVGp0-M?}}\\
📄 Dry ice: extreme freeze - MEL Science: [[https://melscience.com/AU-en/articles/dry-ice-extreme-freeze/?srsltid=AfmBOooL37sgOqUDG-IthF9nQBcofxUmAw5VY9UnZEhnX9947l2f73bU]]\\


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/* VARIATIONS - Optional                                                                               */
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====Variations====
  * Test different objects (leaves, fruit, marshmallows) to see how freezing affects their texture.
  * Use a low-temperature thermometer to follow the temperature as it decreases.


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====Safety Precautions====
  * This experiment must only be performed under professional supervision.
  * Always wear goggles, insulated gloves, and a lab coat when handling dry ice and alcohol.
  * Do not attempt this experiment at home; the extreme cold can cause severe frostbite.
  * Use only glassware rated for very low temperatures to avoid cracking.
  * Work in a well-ventilated space, since carbon dioxide gas is released as dry ice sublimates.
  * Keep flammable materials away - iso­propyl alcohol is highly flammable.
  * Never ingest frozen items made in this mixture.


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====Questions to Consider====
  * Why does adding isopropyl alcohol allow the mixture to reach colder temperatures than dry ice alone?
  * How does the rapid freezing change the structure of the flower or fruit?
  * Why do frozen objects shatter instead of bending like they normally would?
  * How does this process compare to freezing food with liquid nitrogen?


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/* DEMONSTRATION INFORMATION - Required                                                                */
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