Dry Ice Demos!
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Transcript of Dry Ice Demos!
Dry Ice Demos!
Ever wonder how soda companies make their soda fizz??
• They pump in carbon dioxide!!! (BTW that’s what makes ya burp!)
• Today, we are going to make our own carbonated drink!
What is dry ice??
• Frozen carbon dioxide.• Yes, that’s the same gas you exhale when you
breathe and the same gas trees use in photosynthesis!
• Temperature -109.3°F or -78.5°C• Wow! That’s really cold!!!
Why do they call it dry ice??
• Observe the dry ice as your teacher walks around the room. What do you notice that is unusual about the dry ice?
Sublimation
• This occurs when a solid changes phase directly to a gas. There is no liquid phase. This is why it is called “dry” ice because it never gets wet like regular ice!
What would happen if I added some dry ice to my apple juice?
• Go ahead, make a prediction. Guess!!!
Boil, Boil, Toil & Trouble!!
• The heat from the apple juice is transferred to the dry ice, causing it to sublimate faster (that’s the boiling effect you see & hear). But where does the carbon dioxide gas go?? Can you guess what has happened to our apple juice? Try some and see!
How do they make dry ice??
• Every substance has a different freezing point. Companies that make dry ice simply cool air to the point where the carbon dioxide can liquify and then become a solid. It has all kinds of practical uses: fire extinguishers, carbonated drinks, shipping things that have to stay cold (ice cream), fog special effects, etc.