As a mom at home, hosting my son’s class party, and as a teacher, I LOVE weaving elements of STEM into holiday activities and parties. Valentine’s day is the perfect opportunity to engage your kiddos in sweet and simple hands-on science activities disguised as seasonal fun. Keep reading for easy-to-do, engaging activities that are sure to please even Cupid himself!

The key to each of these suggested activities is that they are super simple and most likely can be created with materials you already have in your home or classroom, or can be purchased at any discount or dollar store. Also, these activities are super flexible. You’ll see in the examples below that most of the activities have alternative ingredients or process steps. This is your FREE PASS because basically, you can’t mess these up, and you and your kids will love every minute!


Experiment with and observe buoyancy and states of matter by seeing how different types of Valentine’s Day candy react with carbonated liquids! This love potion will leave heads spinning and hearts pounding!

Love Potion Ingredients


    • Alka-Seltzer original and water, clear soda (i.e. Sprite), or club soda (plain)
    • Clear cups
    • Valentine’s Day candy (Conversation Hearts, heart-shaped Red Hots, sprinkles, etc.)


    • Set out one clear cup.
    • Drop candy pieces into the cup (one type of candy per each cup.)
    • If you are using Alka Seltzer and water, fill the cup with water and drop in a tablet. If you are using soda of some sort, fill the cup with the soda.
    • Watch to see if/when candy pieces float, bounce, and dance inside of the cup.
    • You may need to add more carbonated liquid to see if that changes activity inside of the cup.
    • Make notes, written observations, and draw conclusions.

Love Potion Steps

NOTES: Keep extra Alka-Seltzer tablets and/or soda on-hand to add if candies do not bounce/float. If using Alka-Seltzer, use minimal water at first and add water as necessary.


Candy is a fabulous ingredient for science experiments, and we all know Valentine’s Day has candy-a-plenty. Try some of these instant options for Valentine’s Day candy light refraction and solubility experiments that are crowd-pleasers, but simple to set-up and execute.

Candy Experiment


    • Assorted Valentine’s Day candy (Suggested: clear red heart suckers, Conversation Hearts, heart-shaped Red Hots)
    • Clear cups
    • Water
    • Flashlight (optional)
    • THAT’S IT!


    • Place a sucker in an EMPTY clear cup.
    • Draw how the sucker looks in the empty cup.
    • Place a sucker in a half-full clear glass of water.
    • Draw how the sucker looks in the water-filled cup.  
    • You may want to also try shining a flashlight through and around the candy in the water to test and document the changes (if any) in light refraction with addition of the flashlight.
    • Make notes, written observations, and draw conclusions.


    • Set out one cup for each type of candy you’re using.
    • Fill each cup ½ to ¾ full with water.
    • Place one type of candy in each cup.
    • Check on the status of each cup/candy each 30-60 minutes.
    • Make notes, written observations, and draw conclusions.


These crazy little candies are as great for science experiments as they are for eating! You can use the Pop Rocks and soda as substitutes for baking soda and vinegar in the experiment listed above, or try something totally new using the directions below, courtesy of Steve Spangler Science!!

Pop Rocks Experiment


    • Pop Rocks (try to find multiple flavors; Valentine’s Day versions are available)
    • Balloons (I’m going to use HEART-SHAPED balloons for Valentine’s Day flair!)
    • Funnel
    • 2 16 oz. bottles of soda (the greater soda variety, the better)


  • For a full demonstration of this amazing experiment in chemical reactions from Steve Spangler Science, click the image below to watch an informational video.

Pop Rocks Youtube Video

I can’t wait to see how much my Cupid Kiddos love these sweetheart STEM Valentine’s Day challenges! Try them out in at home or in the classroom and comment to let us know sweet and simple Valentine’s Day STEM activity was your favorite!

Valentine's Day Candy Experiments