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Paper Mache Science

 

Science Activity for Young Children

Please note:  This science activity requires careful adult supervision because you will use boiling water.  I recommend that you boil the water on the stove or microwave in a shatterproof container and bring it to a table for the child to use with you in this activity.  With a little help, your child should be able to do most of the steps in this activity.

This science activity is what I would call a wonderful wow activity because it allows a child to activate and observe physical change.  Physical changes occur when something changes shape, size, but does not change chemically.  For example, when water freezes it goes through a physical change – it becomes hard, but it is still water.  The same is true when water changes to steam, as it does when water is boiled in this activity.

Help your child build his understanding of science concepts and vocabulary by asking questions throughout the activity and by describing what you see and think as you go through each step.  Don’t be afraid to use science words like “evaporation” (water changing from a liquid to a gas when temperature increases) or “condensation” (water changing from a gas to a liquid when it gets cooler), even with your preschooler.  Just hearing these words and connecting them to a hands-on activity will encourage them to be meaningfully stored in their minds for later use!

Ingredients:

1 cup water
¼ cup flour
5 cups lightly boiling water
Newspaper
Balloon

Tools:

Shatterproof  liquid measuring cup
Dry measuring cup (1/4 cup size)
Heavy saucepan (if using stove)
Large mixing  bowl
Spoon


1.  Help your child measure ¼ cup of flour into mixing bowl.

2. 
Fill the liquid measuring cup with 1 cup of tap water.

3.  Combine the flour and water in the mixing bowl and stir.

4.  At this point, spend a few minutes watching how the flour and water mix together (it will make a runny mixture).  Talk with your child about how the mixture looks, feels, smells.  Ask them what they think happened to the flour when it was put into the water – Did it get wet?  Did it dissolve?  Let your child share their ideas and thoughts about the activity.

5.  After you stir the flour and first cup of water together, have the boiling water ready and gradually add it to the mixture while your child continues to stir.  Again, talk about what happens.  Point out the steam as it rises.  Ask your child to describe what they see, how it feels to stir the mixture. (Is their hand getting tired?)

6. 
The mixture should begin to thicken as it is stirred, but in order for the mixture to thicken up to the right consistency for paper mache projects, you might need to put it back onto the stove on medium heat.  The mixture should be like thin oatmeal when you finish – sticky, but not too thick.

7.  When/if you reheat the mixture, invite your child to be with you at the stove.  (How you allow your child to work at the stove depends on your comfort level.)  Here is a great time to talk about why the mixture thickens up:  As the mixture is heated, the water evaporates away, leaving less water behind with which the flour can mix.  Older children might appreciate knowing that flour is made from a plant and full of starch.  When part of the wheat plant is ground up into flour, and the flour gets wet, it is the starch that makes the mixture sticky.  As more water is added to flour, it will gets less sticky, but just the right amount can make a wonderful sticky dough. 

After you have allowed your flour mixture to cool, it can be used with newspaper for making masks or models.  Children love covering an inflated balloon with paper mache, although they might need you to help hold the balloon as they cover it.

8.
  Work with your child to tear the newspaper into long strips.  Newspaper tears easily into strips if you tear down the page, but it will not tear neatly if you turn it on its side for tearing.

9. 
 Help your child dip a piece of paper into the flour mixture.

10.  Using your fingers, “pull” off the extra mixture. (You don’t want the paper to be too wet and goopy!)

11.  Lay the piece of paper over the inflated balloon and smooth it out with your fingers.

12.  Repeat steps 8-11 until you have covered as much of the balloon as you want (for a mask, you might only cover half.)

13.  Allow the newspaper to dry for several hours (overnight, if necessary).

14.  When the newspaper is dry, pop the balloon with a tack or straight pin.

15.  Paint your creation with non-toxic tempera paint or finger paint (available at craft stores and superstores).