11 Fun Valentine Science Experiments

Looking for a kid-friendly way to enjoy Valentine’s Day? Try some Valentine science activities at home!

Here’s a roundup of eleven fun Valentine experiments to do with your kids.
  1. Hearts Bobbing

    At www.candyexperiments.com, I love playing with candy. That’s why it was so fun to come up with a conversation hearts experiment that makes the candy dance!

  2. Foaming Elephant Toothpaste

    Add some pink or red food coloring to make Steve Spangler's foaming experiment a Valentine favorite! Not only do kids get to play with foamy bubbles, it’s an exothermic reaction that teaches chemistry.

  3. Foaming Marshmallow Hearts

    Here’s another way to make Valentine foam: microwave marshmallow hearts in a bottle. In just a short time, the melted marshmallow will start fountaining out of the bottle. (Caution--hot!)

  4. Valentine Slime

    Need a Valentine experiment that keeps your kids busy for a few minutes? This Little Bins For Little Hands activity shows how to make some fun Valentine slime.

  5. Catapult for Conversation Hearts


    Here’s a way to try physics in action from the Frogs Snails and Puppy Dog Tails blog. Build a catapult to launch hearts across the room!

  6. Invisible Valentine Messages

    Find instructions at Red Ted Art for writing Valentine messages with invisible ink!

  7. Make Your Own Stethoscope

    Here’s a creative way from Science-sparks to make your own stethoscope and listen for heartbeats as you teach your kids what a heart really does.

  8. Raining Hearts

    Watch hearts sink through different solutions in this experiment about viscosity in action from Inspiration Laboratories.

  9. Test Sour Candy

    Dissolve your candy and add baking soda to see which ones contain acid.

  10. Find the Sour Ingredients

    This mom at Inspiration Laboratories let her kid test each ingredient that makes up conversation hearts to find out which one causes the baking soda to react.
  11. Pierced Hearts


    Poke a pin right through a conversation heart--without breaking it!

A Fountain of Valentine Hearts

With marshmallows, bottle, and a microwave, you can create a Valentine's day fountain!



What you need:
  • marshmallow hearts, such as Peeps
  • empty plastic water bottle
  • parchment paper (optional)
What to do:
  1. Slide the marshmallows into the bottle. (You may want to roll each marshmallow up in parchment paper to slide it inside the bottle, then pull the parchment paper away.
  2. Microwave the bottle, watching closely to make sure it doesn't get too hot.
  3. Watch the marshmallow come fountaining out of the bottle!

What's happening:
As the marshmallows heat up, the gelatin softens while the air bubbles expand, making the marshmallows grow bigger. Since the marshmallows are trapped in a bottle with a narrow opening, the expanding marshmallow gets forced through the narrow bottle top, creating the fountain effect. <
Drop a Warhead in baking soda water, and bubbles erupt. Leave a Skittle in water, and the S floats to the surface. Melt a Starburst, and shiny oil spots form. You're doing candy experiments--science experiments with candy.

Melt Halloween candy. Dissolve Valentine hearts. Float Easter Peeps. Or let your kids create their own candy science experiments.

Candy experiments. All candy. All science. All fun.



As seen in Family Fun, Parents, Mothering Magazine, Highlights, the Chicago Tribune, ParentMap, Miami Family, and The Red Tricycle


Good news for chocolate lovers! An analysis of several studies, published in the European Journal of Preventive Cardiology, found association between chocolate consumption and a lower risk of coronary artery disease.



The study pointed to consumption at least once a week, but didn't say what kind. Previous studies show the best benefit comes from eating chocolate that's more than 70% dark. Of course, the sugars and fats in chocolate, especially products like cookies, can lead to worse health, so don't go overboard if you make chocolate your new health food!

"More Science that Chocolate May Be Good for Your Heart," Tufts University Health & Nutrition Letter, Jan 2021

"Chocolate is good for the heart," European Society of Cardiology press release July 22, 2020

"Association between chocolate consumption and risk of coronary artery disease: a systematic review and meta-analysis," European Journal of Preventive Cardiology, July 22, 2020

Candy Canes vs. Sugar

Which melts faster, candy canes or pure sugar?  To find out, place a candy cane and a lump of sugar on a foil-lined pan.  Then heat in the oven at 300 F for 5-10 minutes.  Which one melts first?

Table sugar melts at about 360 F.

11 Favorite Candy Experiments

Do you need a fun way for kids to celebrate Halloween and learn science? If so, try some of these candy science experiments to get your candy bubbling, spouting, sparking, sinking, and separating!

Here’s a list of eleven favorite candy experiments from all over the internet.

1. Sour Candy Bubble Test

Sour candy contains acid, which causes the sour taste. With the Acid Test candy experiment, You can test for the acid by dissolving the candy and adding baking soda to make a bubbling reaction.

You can do this with any type of candy, but it’s especially fun with Pixy Stix and Warheads!

2. Floating M&Ms

Need a Halloween magic trick? Drop some M&M’s in a glass of water and watch the letters. In a few minutes, the M’s will start floating!

3. Marshmallow Sink

Can you sink a marshmallow? Take the Marshmallow Challenge to find out!

A marshmallow contains tiny air bubbles, which puff it out to make it less dense than water. To make it sink, you must make the marshmallow denser than water by making it smaller. Smash the marshmallow to break the air bubbles, then roll it into a ball. If you make it small enough, it will sink.

4. Lifesaver Lights

For this experiment, which the Exploratorium calls “Lighting In Your Mouth,” you need a dark room, a mirror, and a pack of wintergreen LifeSavers. Stand in front of the mirror and start chewing the LifeSavers. You will see sparks of light as the energy from the chewing motion rips electrons off of the sugar molecules, then recombines them to release flashes of light.

This also works with other wintergreen sugar candies, such as Altoids.

5. Candy Color Separation

Chromatography lets you separate candy colors so you can see what dyes have been mixed together.

To do chromatography, cut a strip of paper from a coffee filter. Wet a colored candy, such as a brown M&M, and dab a spot of color near the bottom of the paper. Stand up the paper up in glass with a half-inch of water, and watch as the colors rise up the paper.

6. Chocolate Bloom

When chocolate blooms, the cocoa butter begins to separate from the cocoa solids. Eventually the cocoa butter can form complex patterns of white crystals.

7. Dancing Gummi Frankenworms

For the Dancing Gummi Frankenworms experiment, you can make gummi worms dance by slicing them into strips, soaking them in baking soda water, then dropping them in vinegar. The bubbles will hold the pieces up so they dance!

8. Giant Gummies

Make your gummi worms grow to double their length with the Giant Gummies experiment. Just put them in water and wait for two days to see how big they get.

9. Bubbling Pop Rocks

To find the secret ingredient in Pop Rocks, put them in water and watch what happens. As the candy dissolves, it releases tiny trapped air bubbles that float to the surface.

10. Melting Races


If you really want to see what your candy is made of, cover a cookie sheet with aluminum foil, line up different types of candy, and heat in the oven at 300 degrees to see what happens. For instance, you’ll see oil spots form on Starbursts, candy bars melt away from their fillings, and taffy turn translucent as the air bubbles contained inside rise to the surface and disappear.

11. Mentos Coke Geyser

One of the internet’s favorite candy experiments, the Mentos Coke geyser lets you send coke spouting into the air. Try it with Diet Coke, and wear clothes that can get wet!

For more fun ideas on how to experiment with candy, check out the candyexperiments.com experiments page!

3 Fun Halloween Games

Do you plan to skip trick-or-treating this Halloween? You don’t have to skip all the candy fun. This year, switch up your traditions and try some Halloween candy games to get your family together for a night of craziness and laughter.

Here are three fun candy Halloween activities that will get your whole family celebrating.

1. Don’t Eat Pete!

In the game “Don’t Eat Pete,” players get to eat candy on every turn. It’s a way to be silly, make some noise, and eat candy all at the same time.

To play, draw a 3 x 3 grid on a piece of paper, and put a small candy, like an M&M or a jelly bean, in each square. Have a leader secretly choose a piece to be “Pete.” Then let the rest of the people take turns eating the candy. When someone eats the chosen piece, the leader yells “Don’t eat Pete!” and you start a new round.

For an alternative version, send one player out of the room and have the rest of the group choose “Pete.” Then the player returns and starts eating the candy. When the player eats “Pete,” everybody yells together, “Don’t eat Pete!”

2. M&M Knife Game

In the M&M Knife Game, each player gets to scoop up their own candy--with a knife! Fill a bowl with M&M’s, then pass around a butter knife and let each person try to scoop up a serving of candy. You’ll have a great time watching the tricks and techniques kids use to keep candy from sliding off the knife blade.

3. Guess the Number of Candies--With Math!

Fill a small glass jar with candies and have people guess how many are in the jar. But they can use math to guess!

Use a scale to weigh an empty jar, weigh the full jar to find the weight of the candy, and weigh extra candy pieces to find their individual weight. Then divide the weight of the candy by the weight of one candy to find how many there are total.

You can also invite kids to count the pieces they see and guess how many more there are, or just guess wild numbers. After the game, give the candy to the winner--or let everyone eat it together!

Keep Your Halloween Fun

This year, turning away from extra Halloween activities can help us turn towards our families instead. Dress up in costumes, carve your favorite Jack-o’-lanterns, and play the silliest Halloween games you can think of. Because Halloween’s not just about candy--it’s about having fun together.

Need more family Halloween activities? You can find candy science ideas on the Candy Experiments page.