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Home / Early Learning / Science / Super Fun and Engaging Scented Rainbow Science for Preschoolers

Super Fun and Engaging Scented Rainbow Science for Preschoolers

Shared by Mary Catherine 21 Comments

Below you’ll find out how to set up a scented rainbow science activity the kids will want to do again and again (and again!). You can teach the children about chemical reactions with just a few simple materials.

Be sure to add this to your list of rainbow experiment ideas once you’re done.

pictures of rainbow activity with text that reads rainbow science

Related: St. Patrick’s Day Activities for Preschoolers

Kids are natural scientists. They ask lots of questions (as I’m sure you already know), and their innate curiosity has them reaching out and exploring the world around them.

Many children also seem to have a love of fizzing science experiments, for using their senses to explore, and a huge interest in colors.

If you know any children like this, they are going to love this fizzy rainbow science activity!

Table of Contents

  • Rainbow Science That Fizzes and Smells Amazing
    • Rainbow Fizzies Video Tutorial
    • Materials for a Rainbow Baking Soda and Vinegar Experiment
    • How to Make a Rainbow Science Invitation
    • How the Kids Interact with the Rainbow Science Set-Up
    • What Learning Takes Place with the Rainbow Science Activity?
  • Preschool Lesson Plans You Should Check Out
  • Even More Rainbow Activities for Kids

Rainbow Science That Fizzes and Smells Amazing

I know I love integrating rainbows into my preschool lesson plans for March, what about you? St. Patrick’s Day is a favorite holiday of mine, and I always associate it with rainbows.

Of course, this science activity would fit well within a variety of themes – science, rainbows, colors, etc.

Ever since we delved into ABC learning for kids with fizzing letters, I have wanted to try out a rainbow version. So here it is!

Rainbow Fizzies Video Tutorial

First, take a look at the video how-to:

Now let’s jump into the details!

Materials for a Rainbow Baking Soda and Vinegar Experiment

I happened to have all of these materials already on-hand both at home and in the classroom.

That’s because I have a tendency to grab items when they’re on sale and keep them in my “stash”. Please tell me I’m not the only one who does this?

If you don’t have the exact same things listed below, that’s okay. See if you can borrow some ice cube trays from a teaching buddy.

You don’t need both the squeeze bottles AND the eye droppers if you don’t have both. But they are definitely something I suggest having as part of your sensory and science materials if possible.

fizzing scented rainbow experiment for preschoolers

Related: Spring Science for Preschoolers

I may get commissions for purchases made through links in this post.

  • Baking soda
  • Jell-O in every color of the rainbow (well, except indigo)
  • Water
  • Ice cube trays
  • Vinegar
  • Squeeze bottles
  • Eye droppers
  • Food coloring or liquid watercolors

How to Make a Rainbow Science Invitation

Start out by making the scented baking soda “ice” cubes. For each of the colors (red, orange, yellow, green, blue, purple), I used the following “recipe”:

  • 3/4 cup baking soda
  • 2 tablespoons Jell-O powder
  • 1/4 cup water
  • Food coloring (optional)

First, combine the baking soda and Jell-O powder in a bowl, and then add the water and mix.

To make the colors brighter, add a few drops of food coloring or liquid watercolors to the water before pouring it in.

two versions of scented rainbow science
The left-hand photo shows the rainbow ice made with just Jell-O. The right-hand photo shows the rainbow science that had food coloring added to it.

Related: Spring Activities for Preschoolers

You can check out the picture above for a comparison of this rainbow science activity done with just Jell-O, as well as one done with added liquid watercolors.

If you are doing this science activity with young children who might still put things in their mouths, I’d suggest leaving out the liquid watercolors (use food coloring instead or just leave it a little less colorful).

You will have a somewhat pasty mixture, so don’t be alarmed that it’s not a liquid. If it’s too thin it won’t set correctly.

Then use a spoon to add the mixture to the ice cube tray. I found that the above recipe gave me enough to fill one ice cube tray per color.

making rainbow ice

Related: Learning Shapes and Colors with Rainbow Rocks

If needed, tap the ice cube tray on your counter to ensure the mixture settles into the tray evenly.

Place the ice cube trays in the freezer.

Once they’re frozen through, remove from the freezer and get the rainbow science going immediately.

I’d suggest arranging the cubes in rainbow order. But you can also use just a couple of colors to experiment with color mixing.

rainbow ice ready for science

How the Kids Interact with the Rainbow Science Set-Up

Now it’s time to bring on the condiment bottles and eye droppers filled with vinegar! Let the children pour and squeeze as they sit fit.

Be sure to listen closely as they make observations about what they’re seeing. Ask open-ended questions to really get the children thinking.

Encourage the children to experiment to find out the answers to their questions along the way.

squirting vinegar on rainbow baking soda

Related: Rainbow Glitter Jars

Over the years, I’ve done this experiment a few times with kids at school and at home. Each and every time, the kids have asked for “more of that cool rainbow science!”

Here are some of the comments and questions I’ve heard:

  • “I can hear it fizzing! Can you hear it fizzing? Hey, what’s making the fizzing sound?”
  • “I can smell the vinegar right here [putting nose right by the bowl of vinegar], but I can’t smell it once it’s all mixed up there [pointing to the pan with the experiment in it].”
  • “It feels all cold and squishy now!”
  • “Why’s it all turning brown? Is it supposed to turn brown when all the colors are together like that?”
  • “Hey, I need a new pan please. With lots of vinegar. And a towel probably. I’m going to just use some of the colors. Maybe it won’t turn brown this time.”

What Learning Takes Place with the Rainbow Science Activity?

This rainbow science experiment allows for an amazing amount of learning (for a variety of age groups)!

rainbow fizzies in a pan

Related: Spring Messy Play Activities

Here are some of the topics I’ve discussed with preschoolers and elementary-aged children:

  • Colors – tons of color identification, along with a discussion of the order of colors in a rainbow
  • Color mixing – put just two colors into a pan and let the children see what happens when the colors dissolve and mix together
  • The physics of rainbows – while this rainbow science experiment doesn’t delve directly into light and wavelengths, the question “why are the colors in the rainbow always in the same order?” may arise and lead to a great opportunity to discuss this (and plan for further science experiments)
  • Chemical reactions – when baking soda and vinegar react, they create the gas carbon dioxide (which makes the bubbling and fizzing)
  • Endothermic reactions – when baking soda and vinegar react, the temperature lowers
  • Tons of sensory exploration – seeing, hearing, smelling, and touching! It’s a taste-safe experiment so there could be tasting, as well but it wouldn’t taste all the great!
colorful bubbles during a science experiment

Related: “I See a Rainbow” Preschool Color Activity

Would your children enjoy our little rainbow science experiment? If you try it, I’d love to hear about how it goes!!

Preschool Lesson Plans You Should Check Out

Save time and get right to the playful learning with our printable lesson plan sets. Each set includes book suggestions, printable plans, over 30 learning activities (whole group, small group, and centers) related to the theme, and corresponding printables.

Rainbow Lesson Plans
St. Patrick’s Day Lesson Plans

You can also find us on Teachers Pay Teachers

Even More Rainbow Activities for Kids

Click on the links below if you’re looking for more rainbow-themed ideas for preschoolers. Based on my experiences, elementary-aged children will get a kick out of them too!

Rainbow Letter Formation Sticky Wall by Still Playing School

Language Activities for Preschoolers: Rainbow Climb by Growing Book by Book

Inventing Their Own Songs to Encourage Creativity by Capri + 3

Rainbow Domino Game by Rainy Day Mum

Rainbow Patterns with Blocks by Fun Learning for Kids

Preschool Engineering with Rainbows by Natural Beach Living

Design a Rainbow Technology Connection by The Educators’ Spin On It

Disappearing Rainbow Colors by No Stress Homeschooling

Rainbow Ice and Salt Experiment for Preschool by Powerful Mothering

pictures making rainbow ice with text that reads fizzy rainbow science experiment
collage of rainbow activities with text that reads rainbow science
pictures of rainbow activity with text that reads rainbow science experiment
collage of rainbow science with text that reads rainbow science for preschool

Originally published March 4, 2015. Updated with more pictures and a video.

Filed Under: Science Tagged With: #playfulpreschool, #TeachECE, Colors, rainbows, St. Patrick's Day

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  1. Cerys says

    March 4, 2015 at 4:59 am

    We don’t get any flavoured Jell-O powders in the UK without going online do you have a suggestion of something that we could use instead to get the colours/scent. I’d really like to give this a try

    Reply
    • Hannah says

      October 27, 2020 at 10:15 am

      just use Gelatin powder and food coloring should work well.

      Reply
  2. Danielle says

    March 4, 2015 at 10:07 am

    LOVE it! My son would be very excited about this!

    Reply
  3. Theresa says

    March 4, 2015 at 3:04 pm

    That is so pretty. What a magical effect when you use all the colors of the rainbow!

    Reply
  4. Jodie @ Growing Book by Book says

    March 4, 2015 at 3:33 pm

    This looks like pure color fun!

    Reply
  5. Nicolette Roux says

    March 5, 2015 at 9:14 am

    love fizzing things! isnt it fun 😀

    I just wish that baking soda was available in bulk in this country

    Reply
    • Sian says

      February 1, 2016 at 2:51 pm

      If you can find a Chinese supermarket eg Chi Yip or Wing Yip in Manchester, they sell in 5kg bags quite cheaply!

      Reply
  6. Natasha says

    March 5, 2015 at 11:43 pm

    Love fizzing projects. The colors are so pretty and I’ve never done it with jello before.

    Reply
    • Mary Catherine says

      March 10, 2015 at 11:05 pm

      We love fizzing projects, too! 😉

      Reply
  7. Devany says

    March 6, 2015 at 8:40 am

    Oh, so, beautiful! I could look at this pictures all day! I want to play!

    Reply
    • Mary Catherine says

      March 10, 2015 at 11:02 pm

      Thank you! I’ve been having just as much fun as the kids!

      Reply
  8. Kim says

    March 6, 2015 at 9:10 am

    What a fun idea to add Jell-O! I’m sure the kids loved that!

    Reply
    • Mary Catherine says

      March 10, 2015 at 11:01 pm

      They really did, thank you!

      Reply
  9. Alecia says

    March 9, 2015 at 10:02 pm

    I never would have thought of mixing jello and baking soda together. I am sure it must have smelt fantastic and the colours are so vibrant. Love this!

    Reply
    • Mary Catherine says

      March 10, 2015 at 10:59 pm

      It really did smell so good! We love adding Jell-O powder to science and sensory play.

      Reply
  10. Cheryl Self says

    March 8, 2016 at 9:18 am

    My mixture was a paste and I spooned it in an ice cube tray and put in the freezer over night. When I tried to take out the cubes they didnt budge and were squishy. Should I have left them longer? Now I have bags of squishy pasty baking soda with color.

    Reply
    • Mary Catherine says

      March 9, 2016 at 9:11 pm

      I’d suggest using less water – did you try the exact measurements listed here? That’s what worked best for us. As for the bags of squishiness – maybe make a slushy rainbow in a large dish and still try the reactions! The kiddos will love that, too! Let me know what you end up trying and if I can help more!!!

      Reply
  11. Sara says

    July 9, 2017 at 3:14 pm

    Could you make this without the jell-o? Just mix baking soda, water, and food coloring? I realize it wouldn’t be scented then but do you think it would still work the same or is there something about the jell-o that is essential? Thanks for the great an fun idea!

    Reply
    • Mary Catherine says

      July 11, 2017 at 10:47 pm

      Hey Sara! Yes you sure can make it without the Jell-O. We just love adding it for the scent factor. Let me know if you try it out. 🙂

      Reply
  12. Shelby Elliott says

    January 21, 2018 at 7:30 pm

    I was thinking about doing this with a group of kids in my daycare class.. I was wondering would I be able to freeze them the night before and take them to class with me without them melting, or would the mixture be something I would have to mix at the daycare and freeze there?

    Reply
    • Mary Catherine says

      January 21, 2018 at 8:23 pm

      When I did this with my class, I made them at home the night before. Then the next morning, I emptied the trays into Ziploc baggies and took them to school in lunchboxes with freezer packs. They went into the freezer at school and were just fine for using with the kids. 🙂

      Reply
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My name is Mary Catherine, and I love to share meaningful {and fun} learning activities for kiddos! Feel free to browse and stay awhile!

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