Little Science Wizards
Try these experiments at home with your parents!!
Simple Slime Materials Needed:
Measure 1/4 cup of water and put in your bowl. Choose food coloring and only add 1 - 2 drops. Stir water & food coloring. Measure ½ cup of cornstarch and slowly add it to the colored water. Sprinkle it over the water until it is dissolved. You want enough cornstarch mixed so that you see no water on the surface of your mixture. When you mix it is easier to use your hands than a spoon because when it is nearly ready to play with it is nearly impossible to mix with a spoon.
What you have created is called a SOL. It is a colloid made up of a solid and a liquid. Paints, jellies, and starch in water are good examples. Starch molecules exposed to conditions of increased external pressure exhibit temporary crossed linking of hydrogen bonds, forming a temporary solid. This means when Mother Nature hooks a chain of sugar molecules all together we call it starch. Sugar is short and starch is long. When the starch is mixed with water it forms goo that runs all over your hand. That is called a Colloid, or a SOL. When you push the goo, it forced all the molecules to smoosh together and the hydrogen atoms in the water act like little hooks to join them together and it acts like a solid. When you have stopped pushing on the solid the hydrogen atoms let go and it is slimy again.
What to do:
Have an adult, pour hot tap water in a jar until it is about 1/3 full. Place ice cubes and just a little water into the lid. Place the lid onto the top of the jar with the ice facing upward. Within minutes you should see droplets forming on the inside of the jar and the top of the lid.
This shows on a small scale how rain is made. Hot air rises up to meet cold air. The water is condensed out of the hot air. Since more water can be held in hot air than cold, as the hot air cools the water turns into raindrops.
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