# đź§Ş Science with Sarah: Oobleck Slime âš—ď¸Źđź§«

## Make a type of slime that acts as both a solid and a liquid

Hello parents, teachers and students! If youâ€™re looking for fun way to explore states of matter and solubility this experiment is for you!

Be sure to check out GMSA@9 on Wednesdays when Meteorologist Sarah Spivey does the demonstrations and explains the science behind it.

### HEREâ€™S WHAT YOUâ€™LL NEED

For the solubility experiment:

• 4 clear cups
• Water
• Salt, sand, baking soda, and corn starch
• A spoon

For the oobleck:

• A large container
• 1 cup corn starch
• 1/2 cup water
• Food dye (optional)

### DO THE SOLUBILITY EXPERIMENT

• STEP 1: Fill the 4 clear cups with water
• STEP 2: Add to each cup a spoonful of either salt, sand, baking soda, or cornstarch
• STEP 3: Stir each mixture and observe which materials dissolve in the water
• NOTE: The salt and baking soda should dissolve completely in the water. The sand will not dissolve at all. The corn starch will somewhat dissolve in the water.

### MAKE THE OOBLECK

• STEP 1: Measure out 1/2 cup of water and add the food dye to the water
• STEP 2: In the large container, place 1 cup of cornstarch
• STEP 3: Pour the colored water into the large container with the cornstarch and mix using your hands (NOTE: This will be messy! Make sure to have plenty of paper towels nearby and maybe use an apron to cover your clothes!)
• STEP 4: Try compressing the oobleck in your hands into a ball. Observe how it quickly â€śmeltsâ€ť into a liquid.
• STEP 5: You can store your oobleck in the fridge to use for later. When youâ€™re ready to dispose of your oobleck, throw it away in the trash. Large amounts of cornstarch should not go down pipes.

### HOW IT WORKS

Because cornstarch is not totally soluble in water, it can make a non-Newtonian fluid when combined with water.

A non-Newtonian fluid does not follow Newtonâ€™s laws of viscosity. That may be a mouthful, but basically oobleck it is a fluid that can exist both as a solid and a liquid depending on how much force you use!

### SCIENCE WITH SARAH

If youâ€™d like Sarah and David to come to your school and conduct a science experiment live on KSAT, email sciencewithsarah@ksat.com.

Parents and guardians: upload a video of your child performing the activity by clicking here. Send it in and you might see it on GMSA @ 9 a.m.!