Lesson Plans > Science
Yes, it's Fall
and Halloween will be here before you know it. Reader Linda Patton shares
these recipes for physics-defying goop your students can make, play with
and learn from.
2/3 cup warm water
1 1/2 teaspoon powdered Borax
3 drops food coloring
Mix together in a 1 cup measuring cup using a wooden spoon
3/4 cup warm water
1 cup white school glue
Mix together in a mixing bowl using a wooden spoon
Pour the borate solution into the bowl with glue solution. Use your
hands to gently lift and turn the mixture until only one tablespoon of liquid
is left. Flubber will be sticky for a moment or two. After the excess liquid
has dripped off, Flubber is ready. Store in a plastic bag in the refrigerator.
When you are through, discard in a waste can. DO NOT try to wash it down
the sink. If it dries on carpet or clothing, cover it with a cloth soaked
in vinegar to de-gel it, then wash the area with detergent and water.
Measure 1/2 cup liquid white school glue into bowl. I get the best results
with Elmer's School Glue. Measure 1/4 cup Sta Flo liquid starch into the
same bowl. Mix together with a wooden spoon. After the substance becomes
too thick to use the spoon, continue mixing with your hands. This works
quicker with warm hands. Glarch may be stored in a plastic bag. Wash all
Measure 1 1/2 cups of cornstarch and put in a pie pan or container If you
want a color of Oobleck add the coloring to the water first. Then gradually
add approximately 1/2 cup of water to the cornstarch. Stir well (this will
take some time). Add small amounts of more water or cornstarch until you
get a mixture which 'tears' when you quickly scrape your finger through
it AND THEN 'melts' back together again. Oobleck is often referred to as
a 'non-Newtonian' substance because it does not behave as Newton's Third
Law of Motion states; for every action, there is an equal and opposite reaction.
Applying this principle, you would expect Oobleck to 'splash' when you 'smack'
it with your hand. (Smacking is the action, splashing is the reaction.)
However, when you try this out. Oobleck does not splash, in fact, it becomes
a solid substance for a few moments. Why? Scientists explain this as follows.
Uncooked corn starch particles are structured in both crystalline and noncrystalline
arrangements. When slowly mixed with water, the non crystalline structures
of corn starch absorb most of the water. When you smack or stir it rapidly,
you increase the temperature and pressure on the mixture which causes more
non crystalline structures to form. These new noncrystalline structures
absorb more water and the mixture becomes thicker:hence the appearance of
a solid. When you discontinue the pressure, the number of noncrystalline
structures decrease and water is released, creating the 'soupy' mixture.
GUAR GUM SLIME
Put 1/3 cup warm water into a paper cup. Use a stirring stick and add 1/4
teaspoon guar gum into the water. Stir until mixed and the guar gum is dissolved.
Optional:add 2-5 drops of food color. Mix thoroughly. While stirring, add
about 2 tablespoons 4% borax solution to the guar gum mixture. Once the
mixture has gelled, remove the Slime from the cup and knead it in your hands.
Place the Slime in a zipper-type plastic bag to prevent it from drying out.
A few drops of Lysol can be added to the Slime to minimize the formation
of mold and extend the lifetime of the Slime. You can get guar gum from
Put 2 tablespoons 4% polyvinyl alcohol solution into a paper cup. Add 2-3drops
of food color. Mix Pour in 4% borax solution into the cup of polyvinyl alcohol
solution. Stir constantly while the borax solution is being added. Once
the gel has formed, remove it from the cup and knead it in your hands. Place
the Slime in a zipper-type plastic bag to prevent it from drying out. A
few drops of Lysol can be added to the Slime to minimize the formation of
mold and extend the lifetime of the Slime.
Experiment with each of the Slimes by squeezing it; forming it into a ball
and throwing it onto a tile or linoleum floor; by pulling I gently and then
quickly; and by pressing the putty on top of your name written with a water-solubnle,
felt-tip marker. Note: Differences: The Guar Gum Slime is less viscous (more
runny) and can be stretched further before breaking than the Polyvinyl Alcohol
Slime. Similarities: Both slimes are clear and colorless (if food color
is not added), can be molded into different shapes, will flow from a funnel
over a period of time, will bounce (to a certain degree), and will become
flat if left sitting on a flat surface.
The following recipes are Contributor,
Paula Lee firstname.lastname@example.org:
1 cup flour
1T vegetable oil
2T hand lotion
2 t. cream of tartar
1 c water
Mix. For kids crafts.
1 cup corn starch
1 1/2 cup baking soda
Add water to dry ingredients to desired texture and consistency. Color
with food coloring.