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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.
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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.