Wildly Fun Halloween Science Experiments for the Classroom

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pumpkin volcano Halloween science experiment
Alison Smith

Written by Alison Smith

There’s never really a bad time to do science experiments, but let’s face it: There’s something extra fun about Halloween science experiments for kids!

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Maybe it’s because you get to pull out the pumpkins, make ooey gooey slime, or it’s that mad scientist vibe that goes along with the spookiest time of the year? Whatever it is, Halloween science experiments aren’t just fun for kids — they deliver on all the things you want a STEM activity to provide for your students: Helping them develop their inquiry skills, demonstrating the scientific method, and plenty more.

Halloween Science Experiments for Kids

Are you ready? We’re going to show you how easy it is to develop science inquiry skills with a pumpkin, get good and slimey, and do more Halloween science that will have your students in stitches (not literally, we hope!).

 

Spooky Slide or Roll Science Investigation

Are you and your students exploring movement this month? If so, then this could be the Halloween science experiment for you!

This Halloween STEM activity encourages students to observe the way different shaped objects such as balls, blocks, and pumpkins move! Students are encouraged to discuss how the movement of an object depends on a variety of factors, including its size and shape.

Pumpkin Experiment - Early Years Physical Science

This Halloween science experiment is a brilliant opportunity to encourage higher-order thinking:

  • What familiar objects roll and slide? Do you know of any objects that do both?
  • How could we test whether an object rolls, slides, or does both?
  • Is it a Fair Test?
  • In what ways could we record our results?
  • How does the shape and size of the object affect how it moves.

Will the Pumpkin Sink or Float?

In this Halloween-themed science experiment, students explore how the push and pull forces affect how an object moves in water! Students investigate and observe the concept of buoyancy and get an understanding of what objects sink and what objects float … and what it is that makes a pumpkin do one or the other!

Pumpkin Science - Sink or float?

Teach Starter Teacher Tip: Walk your students through the scientific method. Then, as a class, follow the five steps of the scientific method:

  1. Look at the world
  2. Ask questions
  3. Make a prediction
  4. Write or draw what happens
  5. Share findings

So why do objects float? Whether an object floats or sinks is determined by the balance between the downward pull of gravity and the upward push of the water. If the upward push of water is greater, an object will float. If the downward pull of gravity is greater than the upward push of the water on the object, the object will sink.

To continue the discussion after Halloween is over, try these energy, motion, and forces activities:


Pumpkin Volcano!

Feel like creating the wow factor? Use baking soda and vinegar to create an awesome Halloween chemical reaction! This experiment takes the classic volcano STEM activity and adds a Halloween element. And yes, as much fun as they’ll have enjoying the spectacle of this big mess, it’s important for students to explore and begin to understand the science behind it.

Pumpkin science experiment - spooky chemical reaction!

So here’s the spooky science behind this chemical reaction:

  • The baking soda (sodium bicarbonate) is a base while the vinegar (acetic acid) is an acid.
  • Sodium bicarbonate and acetic acid react together to form carbonic acid which is very unstable.
  • The carbonic acid instantly breaks apart into water and carbon dioxide.
  • The carbon dioxide creates impressive fizzing as it escapes from the solution.

How to Make a Pumpkin Volcano:

  1. Hollow and deseed a medium-sized pumpkin.
  2. Add 3 1/2 cups of white vinegar, 1 cup of water, 2 tsp green food coloring, 4 tsp dishwashing liquid into the pumpkin.
  3. In a separate bowl, mix 1 cup baking soda and 1 cup water. Stir very well until dissolved.
  4. Pour the baking soda and water solution into the pumpkin mixture. Stand back!

Please note that ratios may vary. The following ratios are ideal for a medium-sized pumpkin.


Pumpkin Slime

This Halloween activity is, well, just gross and your students will totally love it! Amaze your students with some slimy science facts! Did you know that slime:

  • is a liquid, but not a regular liquid – it’s known as a non-Newtonian fluid
  • flows like a liquid, but unlike familiar liquids (e.g. oil, water), its ability to flow or viscosity is not constant.
  • chemicals are mixed to form polymers. The polymers act as a net, with molecules sliding against each other.

To explore the science of slime in more detail head to Slime – Solid, Liquid, or Gas? For this slime recipe, you will need:

  • small pumpkin for each student group
  • 1/4 cup liquid starch (you can find this in the laundry detergent aisle)
  • 1/2 cup Elmer’s white school glue
  • 1/2 cup water

For more slime fun, read How to Make Slime for Kids (Easiest Recipe Ever!).


So, as you can see, Halloween science experiments and investigations are a whole lot of fun! Most importantly these experiments offer a rich learning experience and a chance to practice the scientific method.

Want more Halloween fun? Check out Halloween games and math and ELAR activities tailor-made for this holiday!

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