Science Projects for Kindergarten: A Soap Experiment

Gather together these items so you can perform this experiment with soap:

  1. 2-3 different brands of soap
  2. Sink
  3. Dirt
  4. Little hands to wash
  5. Cotton balls
  6. Rubbing Alcohol
  7. Notebook
  8. Pencil

Follow these instructions to complete your soap experiment:

  1. Show your students the two or three different brands of soap. Ask the students if they can guess by looking and smelling the soaps which one will clean their hands the best.
  2. Have the students write their guess into a notebook. They can write "My Guess" on the top of the page and draw and color in the soap they think will work the best. When they get older they will learn that this guess is a Hypothesis. It is good to introduce them to the terminology now, however.
  3. Now it is time for the fun part. Have each of the children get their hands dirty. You can have a container of mud or let them wipe their hands in the dirt on the playground.
  4. Take your students to the sink and have them wash their hands with the first bar of soap. Give each child twenty to thirty seconds to clean their hands. (A good rule of thumb is to have them sing the "happy birthday song" to themselves as they wash their hands. It will take about twenty to thirty seconds.)
  5. Wipe each child’s hand with some cotton balls that have a little alcohol on them. Set the cotton balls next to the first bar of soap.
  6. Send the children out to get dirty again.
  7. Have the children wash their hands for the exact same amount of time, but using the second bar of soap.
  8. Again wipe the children’s hands with the cotton balls and alcohol. Place the cotton balls next to the second bar of soap.
  9. Repeat the steps if you have a third bar of soap.
  10. Have the children examine the results. Which cotton balls are the dirtiest? Have the children write the results into a notebook.
  11. Ask the children if anything about the experiment surprised them. Ask them why this type of experiment is helpful.
  12. Have the children write down what surprised them and have them think of something else they can compare and contrast at home.

This science experiment would compliment a series of lessons on health and handwashing.

by Emiliano Spada

This post is part of the series: Kindergarten Science Projects

These projects are fit for Kindergarten children to be able to participate in and learn about science hands on.
  1. Science Experiment on Condensation for Kindgergarten
  2. Mixing Colors in Kindergarten: Fun with Fingerpaint
  3. Science Projects for Kindergarten: Experimenting with Bubbles
  4. Science Projects for Kindergarten: A Soap Experiment
  5. A Candle Experiment for Kindergarten