Making a Fountain of Soda!

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In this lesson, students explore the science behind bubbles in soda and how they create a fizzy sensation. They learn that bubbles are introduced into soda during production and escape when the bottle is opened, leading to fun experiments with different objects like straws and chenille sticks to observe bubble formation. The lesson culminates in a hands-on activity using Mentos and soda to create a soda fountain, demonstrating how the surface texture of the candies enhances bubble production.
  1. What happens to the bubbles when you open a soda bottle?
  2. Why do you think using a chenille stick makes more bubbles appear in soda?
  3. What do you think would happen if we used more or fewer Mentos candies in the soda experiment?

Discovering the Science Behind Bubbles and Soda Fountains

Hey there! Have you ever enjoyed a cool drink on a hot day? It’s so refreshing! My favorite drink is strawberry lemonade, and sometimes I even enjoy a fizzy soda with my friend Squeaks. We love the tingly feeling from the bubbles!

Where Do the Bubbles Come From?

The tingly feeling in soda comes from lots of tiny bubbles. When people make soda, they squirt bubbles into it and quickly cap the bottle so the bubbles stay inside. But what happens when you open the bottle?

When you open a soda bottle, the bubbles start to escape! If you pour the soda into a glass, you’ll see bubbles floating to the top. If you add a straw, you’ll notice bubbles gathering around it. The straw gives the bubbles a place to gather before they float up.

Experimenting with Bubbles

We tried using a chenille stick, which is fuzzy and shaped like a straw. When we put it in the soda, even more bubbles appeared! The fuzziness helped the bubbles come out faster.

Now, let’s try something even more exciting! If you want to try this at home, make sure you have an adult to help and wear safety glasses. You’ll need a bottle of clear diet soda, construction paper, tape, a card, and some Mentos candies.

Creating a Soda Fountain

First, make a tube from the construction paper and tape it closed. Fill the tube with Mentos and place it over the open soda bottle, using a card to hold the candies in place. When you’re ready, pull the card away so the candies fall into the soda all at once. Get ready for a soda fountain!

When the Mentos drop into the soda, they create lots of bubbles very quickly. The bubbles rush out of the bottle, creating a fountain effect!

Why Does This Happen?

Even though a straw looks smooth, it has tiny bumps that bubbles can stick to. The chenille stick is even bumpier, so it creates more bubbles. Mentos have cracks and bumps too, which is why they cause so many bubbles to form quickly.

After the experiment, the Mentos look smooth, but they sure made a lot of bubbles! What do you think would happen if we used more or fewer candies? Let’s experiment and find out!

Thanks for joining us at The Fort! If you want to keep learning and having fun, be sure to subscribe to SciShow Kids. See you next time!

  • Have you ever noticed bubbles in your drinks? What do you think makes them so fun and exciting to watch?
  • Can you think of other things in your life that have bubbles? How do they make you feel, and what do you like about them?
  • If you could create your own soda fountain experiment, what would you use to make the biggest and most exciting bubbles?
  1. Bubble Observation Walk: Take a walk around your home or garden with an adult and look for bubbles in everyday life. Can you find bubbles in a glass of water, soap bubbles, or even in the air? Try blowing bubbles with a straw in a cup of water. What do you notice about how the bubbles form and move? Discuss with your adult helper why bubbles might form in these different places.
  2. DIY Bubble Experiment: With the help of an adult, try making your own bubble solution using water, dish soap, and a little sugar. Use different objects like a straw, a spoon, or a pipe cleaner to blow bubbles. Which object makes the most bubbles? Why do you think that is? Try to describe what you see and feel when the bubbles pop.
  3. Question Time: Think about what you learned from the soda fountain experiment. Why do you think the Mentos made so many bubbles? What do you think would happen if you used a different candy or object instead of Mentos? Discuss your ideas with a friend or family member and maybe even try a new experiment with their help!

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