19 Easy Halloween Science Experiments for Kids

Welcome the spooky season with adorable Halloween science experiments for kids. These fun Halloween experiments are sure to impress everyone, are full of surprises, and are super easy to do at home or in the classroom.

These amazing Halloween science experiments are the perfect way to make your Halloween party a real hit. They will leave children and adults in awe of joy and delight.

Simple Halloween experiments for children

1. Potion that changes color

This spooky color-changing potion is quick and easy to make and will no doubt make even the most skilled witches and wizards jealous. And that’s not all: the potion even bubbles and fizzes!

Our color-changing potions are the perfect spooky season kit and a must-have Halloween experiment that will have everyone mesmerized!

2. The witch’s crystal ball

No list of cool Halloween science experiments would be complete without this spooky DIY crystal ball experiment.

Get the kids (or students!) excited with this cool science demonstration that’s sure to get everyone’s attention. This is one of the most fun Halloween science experiments for 3rd graders and up that requires patience and a steady hand.

Quick tip: Combine these spooky science experiments with kid-friendly Halloween jokes.

3. Bubbling cauldron

The bubbling cauldron is one of the all-time favorite Halloween science experiments for kids and a must-have for every season. It’s easy to do and kids of all ages will love this fun science experiment.

4. Ublek, which changes color

This Halloween, step away from the classic bleak and immerse yourself in a spooky atmosphere with our color changing bleak! This color-changing ublek is sure to delight kids and adults alike, and it’s a lot of fun to make and play with.

This is a great addition to your Halloween science experiments for toddlers, preschoolers, and elementary school students that offers a hands-on STEM lesson on states of matter and acids and bases.

5. Lamp with lava

A lava lamp is a very popular Halloween science experiment for preschoolers and toddlers. The best part is that even kids as young as 5 can do this Halloween experiment with little to no help.

Quick Tip: Don’t forget to add the free Halloween printables for toddlers!

6. Magician’s potion

Children will really enjoy making “Wizard’s Potion”. This is a great Halloween science experiment for elementary students that provides a hands-on lesson in chemistry and exothermic chemical reactions.

7. Bubbling blood

If you’re looking for spooky Halloween science experiments for kids, this one is for you! This kitchen science experiment is very easy to prepare. All you need are tomatoes and baking soda.

Just puree the tomatoes and strain it. If the puree is too thick, dilute it with white vinegar. The consistency should be similar to blood. Pour the tomato puree into a flat plate and add baking soda to it.

The baking soda and acid will make the blood-like puree bubble up, giving it the appearance of bubbling blood!

Related: Discover fun baking soda experiments for kids of all ages!

8. Experiment with paper towels and Skittles

Use up leftover Halloween candy, in this case Skittles, in this fun Skittles experiment.

This Halloween candy experiment combines a rainbow of Skittles with paper dye to create beautifully patterned paper. Take several different colored Skittles and carefully place them on a kitchen paper towel.

Carefully fold the paper towel into a small square so that the candies are in different corners. Now use an eyedropper to put a few drops of water on the paper towel where the candy is.

Leave for 10 minutes, then gently unfold the towel to reveal a beautifully patterned paper in Skittles colors!

9. Tournament of wizards with nested towers of bubbles

This is a super fun science challenge that will appeal to everyone from kids to adults! Set the mood by turning it into a fun Halloween game – we like to call it the Wizarding Tournament.

Everyone has a maximum of 3 minutes to build a tower of nested soap bubbles. Whoever does it best – with the most bubbles nested inside each other in 3 minutes – will definitely become the most powerful and cleverest wizard or witch!

For middle school and high school kids, make it a Minute to Win Halloween STEM challenge.

Although this is not a classic Halloween science experiment, we definitely recommend it because it requires wizard-like skills and is just as much fun!

Quick Tip: Check out this soap solution recipe for the best bubble towers ever!

10. Do-it-yourself water volcano

Surprise the kids with this Halloween STEM experiment that creates an underwater volcano that spews blood! Perfect for the spooky season, it requires minimal preparation and common materials to create a spooky underwater volcano.

11. Screaming coin!

Make a coin scream with this spooky Halloween science experiment. All you have to do is press the coin against the dry ice to hear it scream!

This mysterious screeching sound is made by a coin when it is made to vibrate by carbon dioxide emitted from dry ice. Simple science, but a lot of fun!

P.S: If you’re doing this Halloween science experiment with kids, make sure they don’t touch the dry ice with their bare hands!

Related: Try these fun Halloween activities for kids to keep them freaking happy!

12. Increasing and decreasing jelly bears

Put your magic skills to the test in this fun science experiment that allows you to both enlarge and shrink gummy bears. This candy science experiment for kids learning osmosis is a great way to use up some of that Halloween candy.

13. Experiment with rising water

This is a great way to surprise your little scientists for Halloween. A simple water rising experiment is a great addition to Halloween mystery experiments for preschoolers and elementary students learning about atmospheric pressure.

Take a flat deep plate and pour some water into it. Add food coloring to the water. We chose red to go with the Halloween theme.

Place a tea light in the middle of the plate and light it. To make the water rise, put the glass on the candle. In a few seconds, the candle will go out and the water will magically rise in the glass.

Weird, right? While we want you to believe in magic as Halloween approaches, there is a very simple science behind this experiment.

The candle heats the air above it in the glass, increasing the air pressure in it. When the candle burns all the oxygen in the glass, it goes out. This lowers the temperature, causing the air in the glass to cool and compress.

Thus, the air pressure inside the glass decreases compared to the air pressure outside. This forces outside air to enter the glass along with the water until the air pressures inside and outside the glass equalize.

14. Experiment with the density of candies

This experiment is a great addition to Halloween science experiments for elementary students learning about density, and it accomplishes the goal in the most fun and easy way possible.

Grab two candies—one with plain chocolate and one with nuts, such as Snickers or Reese’s peanut buttercups. Cut identical pieces from each and drop them into a glass of water to see which floats and which sinks.

Obviously, Snickers sinks because of its high density due to the peanut content, while regular milk chocolate floats. The same goes for milk chocolate and chocolate wafers.

Try this fun STEM activity for Halloween with other candy too. Before testing, try to guess which ones will sink and which ones will float.

Quick Tip: Don’t forget to take this season’s Halloween themed quiz!

15. Flying ghosts

Flying Ghosts is one of those classic and great Halloween science experiments that hasn’t lost its appeal over the years. This is a simple Halloween themed experiment that only requires a tea bag and a lighter.

Pour out the contents of the tea bag by cutting the top part. Place it on a flat, clean surface and draw a creepy ghost with a felt-tip pen.

Next, gently blow on the bag to open it and place it on a plate. Light the top of the tea bag on fire and watch your flying tea bag ghost soar!

16. Volcano “Jack-O-Lantern”

The classic Pumpkin Volcano is a must-have among simple Halloween experiments for kids. All you need is dish soap mixed with vinegar and baking soda to create this fizzy, bubbling volcano.

If you want to add a spooky Halloween touch to this experiment, replace the baking soda and vinegar mixture with dry ice in warm water to make a thick fog come out of the Halloween pumpkin. It will make your Halloween night a lot of fun!

Related: Get your kids creative with easy Halloween crafts.

17. Make “Unicorn” slime

Make way for magic and myth with Unicorn Slime. This unicorn-inspired concoction makes a great addition to Halloween fun, is easy to make, and promises hours of fun.

18. Glowing ice

This fun Halloween science experiment for high school students is a must-try! Nothing could be creepier than blue light ice.

All you have to do to create glowing ice is freeze the tonic in an ice cube tray. The tonic contains quinine, which glows in ultraviolet light. Add it to your drink to make it shine.

19. Flowers that change color

Magically change the color of your flowers this Halloween! Well, what! There’s some interesting science behind it, and who says science isn’t magical?

20. Water that defeats gravity

Nothing can be as amazing as a water trick that defies gravity. Challenge everyone and show off your wizarding skills (aka science skills) with this fun and simple experiment for kids of all ages in which water refuses to obey the laws of gravity!

21. Generate electricity with a pumpkin

Halloween fun doesn’t get much better than this! With pumpkins around, it’s just the perfect time to make a pumpkin battery and show off your wizarding (or scientific!) skills.

We guarantee that this Halloween science experiment for middle and high school students will energize your students and children.

22. Invisible ink

This easy-to-do experiment with invisible, color-changing ink will create a festive Halloween atmosphere. This invisible ink, which requires no heat, is sure to impress everyone and is perfect for kids of all ages.

Source: 19 Best Halloween Science Experiments for Kids