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.