Slime,+Goo+and+Ooze

Slime, Ooze and Goo The viscosity of a liquid is a measure of its resistance to flow. We can change the viscosity of certain liquids by stirring them or applying pressure. A dense mixture of cornflour and water is an example of a stir thickened liquid, in which the viscosity is increased when it is stirred or compressed. Some liquids become thinner when stirred, such as tomato sauce, sour cream and toothpaste. __**Ooblek**__ media type="youtube" key="XbWBkwM1WAI?rel=0" height="480" width="853" **Materials:** -Cornflour -water -food colouring -mixing bowl -spoons

Procedure: 1. Mix together 1 cup of cornflour and 1/2 cup of water in a bowl. Add in a drop or two of food colouring. Mix slowly to combine ingredients. 2. Stir until everything is evenly mixed. 3. Play with your ooblek. What happens? Does it behave in they way yo expected it to?

Try this experiment again but change the amount of water added. Does this have an impact on the consistency of the Ooblek?

__**Mucus Slime**__

**Materials:** 2 teaspoons of Lux Flakes a few drops of food colouring 2 cups of very hot water a mixing bowl a measuring cupa stirring spoon.

**Procedure:** 1. Mix all ingredients and stir vigorously 2. Your mixture will bubble and foam. Watch it flow.

How would increaseing the amount of flakes change the outcome of this experiment?

__** Elephants Toothpaste **__ media type="youtube" key="ZDd3pGIyS7I?rel=0" height="480" width="853"

Materials

 * empty plastic soda bottle (preferably with a narrow neck such as those made by Coca-Cola)
 * 1/2 cup 20-volume hydrogen peroxide (20-volume is 6% solution, purchased from a beauty supply store)
 * Squirt of dish detergent
 * 3-4 drops of food coloring
 * 1 teaspoon yeast dissolved in approximately 2 tablespoons very warm water
 * Funnel
 * Foil cake pan with 2-inch sides

**Procedure:**
 * Stand the bottle up in the center of the cake pan. Put the funnel in the opening. Add 3-4 drops of food coloring to the peroxide and pour the peroxide through the funnel into the bottle. Show a water molecule diagram and a peroxide molecule diagram, pointing to the extra oxygen that will be set free in the reaction.
 * Add the Dawn detergent to the peroxide in the bottle.
 * Pour the yeast mixture into the bottle and quickly remove the funnel.
 * The students can touch the bottle to feel any changes that take place.

Observations
The reaction creates foam that shoots up out of the bottle and pools in the pan. After a minute or so, it begins to come out in a moving stream that looks like toothpaste being squeezed out of a tube. The students can play with the foam as it is just soap and water with oxygen bubbles. The bottle will feel warm to the touch as this is an exothermic reaction.

__**Flubber**__ media type="youtube" key="KAY86VAk7HQ?rel=0" height="480" width="853" Materials: • PVA glue • Borax (be sure to read and follow all cautions on the Borax box label) • 2 small plastic cups • Popsicle stick • Water

**Procedures:** 1. Place 2 teaspoons of water in a small plastic cup. Add 1/4 teaspoon of borax and swirl until as much borax dissolves as possible. 2. Place 2 teaspoons of water in another cup and add 2 teaspoons of Elmer's glue. Mix with a Popsicle stick. 3. Continue mixing the glue and water solution, and have your partner slowly add the borax solution. You will only need to use a small portion of the Borax solution. 4. When you have some nice thick Flubber, pull it off the Popsicle stick and move it back and forth between your hands.

Glue has a chemical in it called polyvinyl acetate. This is a very long and flexible molecule. Borax solution has a chemical in it called boron. When the borax solution is added to the glue solution, the boron atoms help link the long polyvinyl acetate molecules to each other so they cannot move and flow as easily. When enough polyvinyl acetate molecules get hooked together in the right way, the glue solution changes from being very liquidy to a rubbery kind of stuff that we call Flubber!

* Try not to get the borax on your skin. If it does come into contact, rinse well with water.

Always: • Work with an adult. • Read and follow all directions for the activity. • Read all warning labels on all materials being used. • Wear eye protection. • Follow safety warnings or precautions, such as wearing gloves or tying back long hair. • Use all materials carefully, following the directions given. • Be sure to clean up and dispose of materials properly when you are finished with an activity. • Wash your hands well after every activity. Never eat or drink while conducting an experiment, and be careful to keep all of the materials used away from your mouth, nose, and eyes!