- Measuring cup, cornstarch, yellow food coloring, blue food coloring, large bowl, spoon
- 30 minutes
- Physical science
When salt or sugar mixes with water, they dissolve in the water to form solutions. Substances that do not dissolve in water form a mixture called a suspension. Follow the instructions below to create a suspension and investigate its properties:
- Pour one cup of cornstarch into the bowl.
- Measure out 2/3 cup of tap water. Turn the water green by adding three drops of yellow food coloring and three drops of blue food coloring.
- Slowly pour the green water in the bowl. (You might not need all the water.) Mix well with the spoon and your hands.
- Take a handful of the green substance and roll it into a ball.
- Stop rolling and let the ball rest on your palm.
Cornstarch and water, like quicksand or ketchup, is a type of mixture called a suspension—it never really mixes together. Rolling the mixture in your hands, it compresses together and feels dry. Once you stop rolling, the cornstarch starts pulling away, leaving ooze in your hands.
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