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Simple STEM Science Experiments for Ages 3 and Up-Part 2

More Fun Satisfying STEM Learning for Kids (That Will Get Them Excited About Science)

I hope you and your child enjoyed Part 1's science experiments. If not, you can find them here:

Here are a few more simple science experiments you can do with your kids as young as 3 years old for more at-home, learning fun.

In this post, I will give you instructions for: EXPLODE A BAG, THE DISAPPEARING TEST TUBE, and RAINBOW IN A GLASS/TEST TUBE.

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What You Will Need

- A large bowl

- A Ziplock sandwich bag

- Baking soda

- Toilet tissue

- White distilled vinegar

- Scotch tape

- Safety goggles


  1. Put on safety goggles.

  2. Measure 1 rounded tbsp of baking soda into a single square of toilet tissue. Fold and secure flap with a small piece of tape. Then fold vertically to form a small pouch and wrap all the way around with a large piece of tape to securely close your pouch.

  3. Pour 1/3 cup vinegar into your sandwich bag.

  4. Hold bag so that vinegar stays at the bottom of the bag. Place baking soda pouch into top of bag but don't yet allow it to touch the vinegar.

  5. Zip bag shut without letting chemicals mix yet.

  6. Once the sandwich bag is zipped close, lift the bag up so the pouch mixes with the vinegar, shake bag quickly 3 times, than place into bowl and watch the reaction take place...until POP!


What You Will Need

- A glass test tube (won't work with plastic)

- Glass beaker (or a glass measuring cup)

- Vegetable oil (or any other oil)


  1. Fill the beaker 1/2 full with oil (or full enough that the test tube can be mostly submerged in the oil).

  2. Fill the test tube half full with oil.

  3. Place the test tube into the beaker and...Abracadabra, where'd the bottom of your test tube go?!

  4. Pull you test tube out and submerge again, this time slowly, and watch as the test tube slowly disappears as you submerge it.


What You Will Need

- Sugar

- Water

- Food coloring

- 6 cups or containers, at least one of which is clear or see-through and narrow (like a test tube or tall skinny glass

- A tablespoon

- Spoon or dropper


  1. Line up your 6 cups.

  2. Add 1 tbsp of sugar to the 1st cup, 2 tbsp of sugar to the 2nd cup, 3 tbsp of sugar to the 3rd cup, 4 tbsp of sugar to the 4th cup, and 5 tbsp of sugar to the 5th cup. Your tall skinny, clear glass remains empty for now.

  3. Add 3 tbsp of water to each of the first 5 cups.

  4. Stir each solution.

  5. If the sugar does not dissolve in any of the 5 glasses, then add one more tbsp of water to each of the 5 cups.

  6. Add 2-3 drops of red food coloring to the 1st cup, yellow food coloring to the 2nd cup, green food coloring to the 3rd cup, blue food coloring to the 4th cup, and purple food coloring to the 5th cup.

  7. Stir each solution.

  8. Now, time to make our rainbow. Fill the last cup about 1/5 full with the purple sugar solution.

  9. Carefully layer some blue sugar solution above the purple solution. Do this by putting a spoon in the glass just above the purple layer, and pouring the blue solution slowly over the back of the spoon. Or, you can use a dropper and slowly drop the blue layer in. If you do this right, you won't disturb the purple solution much at all. Add blue solution until the glass is about 2/5 full.

  10. Repeat the last step with the green, then yellow, then red solutions to fill the glass the rest of the way.

  11. Voila! You have a rainbow in a glass!

Alternative: You can also try this experiment using Skittles (instead of food coloring and sugar) by adding 1 red Skittle to the 1st cup, 2 orange Skittles to the 2nd cup, 3 yellow Skittles to the 3rd cup, 4 green Skittles to the 4th cup, and 5 purple Skittles to the 5th cup. Then dissolve your Skittles by adding 3 tbsp hot water and stirring or letting sit until your Skittles have completely dissolved and your water has completely cooled. Then you add your layers in the same way as above.

I hope you and your kids enjoy and have some fun with these experiments and your kids are well on their way to being science lovers!

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