Mentos and Diet Soda Experiment with Free Lesson Plan and Printables

The other day we did the Mentos and Diet Soda experiment after having seen it on MythBusters. It was a blast!

The Diet Coke and Mentos experiment was a blast (literally!) and we learned a lot about nucleation. In fact, it was so much fun that I wrote up our experiment, created observation and tracking sheets, and have uploaded them all for you to use…for free!

Read the experiment below or scroll allllll the way to the bottom to get the printable version.

Diet Coke and Mentos Experiment

Nucleation Lesson Plan

Have you ever seen pictures of a volcano erupting? Well, today we are going to make soda erupt!

We are going to use soda and Mentos candy to create our geyser. By dropping an entire pack of Mentos into a 2 Liter bottle of diet soda at once, we will see the reaction of a process called nucleation.

Vocabulary Words

  • Nucleation
  • Nucleation Sites
  • Erupt
  • Geyser
  • Chemical reaction
  • Physical reaction

Read and Watch

You can read more about nucleation and nucleation sites from Steve Spangler Science. Be sure to watch the second video in from the left under the picture at the top.

You might also want to watch this explanation video from Myth Busters, a show that focuses on solving science-related problems:

Nucleation Experiment

Experiment Supplies

To do our experiment we will need:

• 2 Liter bottle of diet soda

• 1 roll of original Mentos*

• 1 geyser tube

Tracking Sheet

Observation Sheet

• Safety Goggles

*You must use original Mentos, as the flavored ones have a waxy coating that hinders the reaction.

Experiment Directions:

  1. Take out the Mentos and Diet Soda Tracking Sheet. Fill in the column for the diet sodaʼs name and your prediction as to what will happen based on what you read and watched on the websites above.

  2. This experiment is messy, so you will want to do it outside in an open area away from anything that you do not want to get sticky. You will probably want to be in old clothes too...just in case.

  3. Put on your safety goggles. Remember, safety first!

  4. Open your roll of Mentos and insert them all into the geyser tube.

  5. Open the bottle of soda and attach the geyser tube.

  6. Stand back and pull the release string on the geyser tube to release the Mentos.

  7. Snap a photo as the soda erupts.

Optional: After you have experimented with one diet soda, try the experiment with different types of soda to see which ones has the most intense reaction.

Mentos and Diet Coke Experiment Follow-Up

Wasnʼt that neat?! Now, we are going to finish up by filling out the Outcome column on the Tracking Sheet.

If you experimented with more than one type of diet soda, rank them in order of which produced the most explosive eruption.

Complete the Observation Sheet by drawing what happened.

Label the parts of your drawing.

Next, write a short (2-3 sentence) summary of what is being shown in your drawing.

Optional Discussion Questions:

  1. Describe what happened in the experiment.

  2. What could you have done differently?

  3. What do you think would have happened if you used a different type of diet soda?

  4. What do you think would have happened if you only used half of the pack of Mentos?

  5. What do you think would have happened if the soda was flat?

Download the Mama Teaches Mentos and Diet Soda Experiment lesson plan,tracking sheet, and observation sheet. Be sure to snap a photo and post a picture of your experiment on our Facebook page. We would love to see your results!

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