Top 5 Halloween Science Experiments!

October is here, which means Halloween is on the way! Here are some fun and easy Halloween science experiments that you can try with your kids to get them in the spooky mood!

1- Creepy Density Experiment

Fun Science Halloween ExperimentThis one is great for getting some Halloween colours whilst exploring density at home!

You need – A glass or jar, treacle, golden syrup, water, food dye, and cooking oil.

What to do – Slowly pour each liquid into a glass or jar in the following order – treacle, syrup, water (mixed with the food dye) and finally the cooking oil.

What happens when you add some small items, like a paper clip or small plastic toy?

Thanks to Science Sparks for this experiment.



2 – Bubbling Brew

This freaky, frothy experiment is great for any witches or wizards out there!

You need – A glass jar, white vinegar, washing up liquid, bicarbonate of soda, food dye, glitter.Fun Science Halloween Experiments

Note – you may want to do this experiment outside or on a baking tray as it can get a little messy!

What to do –

  • Fill the jar half full with vinegar
  • Add a little washing up liquid , drop of food dye and some glitter.
  • Stir the mixture
  • Add a table spoon of bicarbonate of soda and watch!

Thanks to se7en for this bubbly experiment!

3- Erupting Pumpkin

Give your pumpkin carving an explosive twist this halloween!

You need –

  • Hydrogen Peroxide (available at your local chemists)
  • Yeast
  • Washing up liquid
  • A carved pumpkin!
  • Food dye
  • 3 plastic cups

Note – all the ingredients are safe for children to use.

What to do:

  • Fill one cup half full with hydrogen peroxide and add a squirt of washing up liquid, place the cup inside the pumpkin.
  • Add half a cup of yeast to half a cup of water, add a few drops of food dye and stir.
  • Pour the mixture into the cup that you placed inside the pumpkin.
  • Watch your pumpkin erupt!

4- Alien Eggs

Make some great, gooey decorations to make your house look extra spooky!

You need:Fun Science Halloween Experiments

  • Eggs (as many as you want)
  • A glass jar
  • Golden syrup
  • White vinegar
  • Food dye

What to do:

  • Put the egg(s) in the jar and cover with white vinegar.
  • Leave in the fridge over night.
  • Rinse the egg(s) with water, how do they feel?
  • Pour out the vinegar and put the egg(s) back in the empty jar.
  • Cover the eggs with the syrup and some food dye (green looks great!)
  • Leave in the fridge over night again.
  • Feel your egg(s) again or just leave them submerged for a great decoration!

Thanks to The Kitchen Pantry Scientist for this experiment!

5 – Monster Slime

This is a simple, hands-on experiment that will keep the kids occupied for ages!

You need:

  • Cornflour
  • Water
  • Food dye
  • A bowl

What to do:

  • Put some cornflour in a bowl and add a little water (like making icing from icing sugar).
  • Add some food dye (add more for a bolder colour!)
  • See what happens when you play with the mixture, does it change when you move it in your hands?