Our experiments confirmed that cold bottles of coke and lemonade, straight out of the fridge, do not work very well. They produce a rubbish geyser and the reaction is much slower compared to drinks that are at room temperature. Bottles warmed up in the sun are the BEST! Check out our image below, and yes, we dropped the Mentos in at the same time!! The drink on the right had just come out of the fridge we cooled the Mentos too , and the one on the left was at room temperature — what a difference!
We made a video too…. At warmer temperature CO2 gas particles and other molecules have more energy. Therefore, the particles move faster and want to escape the liquid they are dissolved in quickly compared to cooler temperatures. Try cracking open a can of warm fizzy drink and compare it to one just from the fridge! Try This at Home! Make sure you wear your goggles and lab coats, so that you are not only protected, you also look cool as you run away from the flying soda.
The Big Question What happens if you drink soda and then eat Mentos? Well, a lot of the fizz goes away as you drink. Then when bubbles are released in your stomach, your stomach can expand a bit. Do not, repeat, do not be stupid and test the limits of your stomach. Don't even think about it. What Else Works? Shockingly enough, dropping just about anything into just about any kind of soda creates at least a little fizz.
Even some pocket change made a bottle of root beer bubble up a bit. Does It Have to be Diet? Diet Coke and Coke Zero tend to go a bit higher than regular soda, because they have a little more carbonation and the sweeteners help make the reaction a little bigger.
New Scientist has this great summary of the explanation. Fun with Nucleation You can learn more about nucleation sites in action if you coat the inside of a small glass with vegetable oil. Move the glass around to get a nice smooth coating of oil and then pour in some soda. There is a pretty cool thing you can do with a bottle of soda pop and a packet of Mentos. Wrap the paper around the pack of Mentos to make a tube. Use masking tape to tape the tube closed.
Remove the pack of Mentos from the tube. Close off one end of the tube by cutting a little circle or square of paper and taping it to one end of the tube. Put the open end of your tube of Mentos on the card and place it directly over the opening of the soda bottle. When you are ready, remove the card and let all the Mentos drop into the soda at once and quickly move out of the way.
The carbon dioxide molecules attach to the surfaces of the Mentos like they did in the cup of soda. All those Mentos in a lot of soda make a lot of bubbles that rise to the surface and push the soda out in a big woosh! Mentos and Diet Coke! Have you ever noticed that when you put a straw in soda pop, the straw gets a lot of bubbles on it?
Why does that happen?
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