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Dissolving Peeps Experiment: STEM Activity for Eastertime

Who’s up for a fun STEM activity for Eastertime? The next time you’re at the grocery store, pick up a package of marshmallow Peeps! Then, do the Dissolving Peeps Experiment with your kids. Feel free to adjust the experiment to try other liquids, other additives, and other candies!

Scroll to the bottom for a free download!

Dissolving Peeps Experiment: STEM Activity for Eastertime

Disclosure: I get commissions for purchases made through affiliate links in this post.

Supplies for Dissolving Peeps Experiment

  • 6 cups or glasses
  • pieces of paper and pencil to label each glass
  • a timer
  • 6 cups water
  • ½ cup sugar, divided
  • ½ cup salt, divided
  • 6 marshmallow Peeps

Dissolving Peeps: STEM Activity for Eastertime

Dissolving Peeps: STEM Activity for Eastertime

Instructions for Dissolving Peeps 

Place 1 cup of cold water into three different cups. Into one cup, add ¼ cup sugar, stirring until it is dissolved. Into the second cup, add ¼ cup salt, stirring until dissolved.

Dissolving Peeps: STEM Activity for Eastertime

Dissolving Peeps: STEM Activity for Eastertime

Heat the remaining 3 cups of water until hot.

Dissolving Peeps: STEM Activity for Eastertime

Place 1 cup of hot water into three different cups. Into one cup, add ¼ cup sugar, stirring until it is dissolved. Into the second cup, add ¼ cup salt, stirring until dissolved.

Dissolving Peeps: STEM Activity for Eastertime

 

Dissolving Peeps: STEM Activity for Eastertime

Dissolving Peeps: STEM Activity for Eastertime

Place one marshmallow Peep into each cup of water. Set a timer for 2 minutes.

Dissolving Peeps: STEM Activity for Eastertime

When the timer goes off, check the Peeps and make note of which have changed on your blank form (see below for a free download).

Dissolving Peeps: STEM Activity for Eastertime

Continue checking the marshmallow Peeps every 2 to 5 minutes, making note of the changes.

Dissolving Peeps: STEM Activity for Eastertime

Dissolving Peeps: STEM Activity for Eastertime

Discuss which liquids caused the marshmallow peeps to dissolve faster/slower and why.

What does “dissolve” mean? When a solid dissolves in a liquid, it becomes incorporated into the liquid so as to form a solution.

When the Peeps are added to the water, salt water, or sugar water, the sugar and other ingredients in the Peeps dissolve into the liquid. The liquids with higher acidity break the sugars down faster than the liquids with less acidity. And the hot water breaks them down faster than the cold water.

Dissolving Peeps: STEM Activity for Eastertime

Dissolving Peeps: STEM Activity for Eastertime

Dissolving Peeps Experiment: STEM Activity for Eastertime

If desired, repeat the experiment using different liquids such as vinegar, milk, liquid dish soap, oil, soda pop, etc.

Dissolving Peeps Experiment: STEM Activity for Eastertime

Another fun activity to try is the Straw Rocket STEM Challenge.

Free Download for Dissolving Peeps Experiment

Get a free download of Dissolving Peeps

Instructions and Blank Form

 

 

Dissolving Peeps Experiment: STEM Activity for Eastertime

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Dissolving Peeps Experiment: STEM Activity for Eastertime

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