Crazy Ooze and flubber

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School

Northview High School *

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Course

1010

Subject

Chemistry

Date

Nov 24, 2024

Type

docx

Pages

Uploaded by MajorPartridge880

Name:__________________________Date:________Period:____ Crazy Ooze (Oobleck) and Flubber (Slime) Lab! Part A: the “Oobleck” Part B: The “Slime” Materials:  1 cup Cornstarch  water  Stirring stick  spoons  bowls  food coloring  paper clip  scissors Materials:  100mL of water  100mL of glue  Food coloring  Borax  Bowls  Food coloring  Measuring spoons Procedures: 1. Pour 1 cup of corn starch into a bowl. 2. Slowly add water from the beaker (a little at a time— Pour 1 “Mississippi” and stir at a time), mixing with a stirring stick. 3. Add 3 drops of food coloring. Stir with your fingers. 4. Set aside the empty beaker in a safe place (to be used later) 5. Follow the “action” that you need to take in your observation data chart. Record your observation below. Do all actions listed in this part before cleaning. *You can divide this up amongst yourselves and put it in a Ziploc bag AFTER you record the observation. **After observation: clean your bowl thoroughly using the water from the sink. Dry your bowl with a rag. Procedures: 1. Pour 100mL (1/2 cup) of water from beaker into a bowl that contains glue (1/2 cup). 2. Add a couple of drops of food coloring and stir with stick until mixed completely 3. Add your activator: *Using Borax: Mix 1 cup of warm water with 1 tsp of borax powder to make the activator. Add small amounts to you glue mixture until the right consistency (up to you) * Using saline solution: Add 1 ½ Tablespoon of solution to the glue mixture. * Using liquid starch: Add ¼ cup of liquid starch to glue mixture. 5. Pick up the mixture and knead it with your hands until it is combined. It is okay if there is water left in the bowl. 6. Do the actions below and record observation. 7. Clean up! Observation: Action What Happens? Gently bang on it with a spoon It oozes Place a tiny object (paper clip) on top of it The chemical starts to move As you pour ooze into another container, try to cut it with a pair of scissors I can’t cut it with a scissor Squeeze the ooze It is smooth Shape it into a ball It looks weird After shaping the ooze into a ball, open your hand. It changes shape Observation: Action What Happens? Gently bang on it with a spoon Pull the flubber apart Squeeze the slime Shape it into a ball After shaping the slime into a ball, open your hand. Let the flubber lie flat on the desk and leave it there for a couple of minutes * Please clean up the lab stations back to how you found it!

Name:__________________________Date:________Period:____ What’s happening? Your Ooze is made up of tiny, solid particles of cornstarch suspended in water. Chemists call this type of mixture a colloid. Back in the 1700s, Isaac Newton identified the properties of an ideal liquid. Water and other liquids that have the properties that Newton identifies are call Newtonian fluids. Your Ooze doesn't act like Newton's ideal fluid, so it's a non-Newtonian fluid. There are many non-Newtonian fluids around. They don't all behave like your Ooze, but each one is weird in its own way. Ketchup, for example, is a non- Newtonian fluid. Quicksand is a non-Newtonian fluid that acts more like your Ooze--it gets more viscous when you apply a shearing force. If you ever find yourself sinking in a pool of quicksand (or a vat of cornstarch and water), try swimming toward the shore very slowly. The slower you move, the less the quicksand or cornstarch will resist your movement. Discussion Questions: 1. Is the ooze an element, compound or mixture? Using the definition, explain your answer in complete sentences. It is a mixture because it’s mixed with different things 2. List some physical properties of ooze (name at least 4) 3. What properties does the ooze have that makes it a solid? (think: shape, volume, how it pours, etc) The shape is not really stable. It is not so big in size either 4. What properties does the ooze have that makes it a liquid? water 5. What must happen for something to be considered to have gone through a chemical change? Did ooze go What’s happening? The PVA glue you use is a type of polymer called polyvinyl acetate (PVA for short), while the borax is made of a chemical called sodium borate. When you combine the two in a water solution, the borax reacts with the glue molecules, joining them together into one giant molecule. This new compound is able to absorb large amounts of water, producing a putty like substance which you can squish in your hands or even bounce. Generally we classify things as liquid or solid or gaseous but there are some substances that don't behave like expected, like our Ooze and our flubber. Discussion Questions: 1. Is the flubber an element, compound or mixture? Using the definition, explain your answer in complete sentences. 2. List some physical properties of flubber (name at least 4) 3. What properties does the crazy flubber have that makes it a solid? (think: shape, volume, how it pours, etc) 4. What properties does the crazy flubber have that makes it a liquid? 5. What must happen for something to be considered to have gone through a chemical change? Did flubber go through a chemical change or a physical change? Using specific evidences from the lab, explain your answer THOROUGHLY. * Please clean up the lab stations back to how you found it!

Name:__________________________Date:________Period:____ through a chemical change or a physical change? Using specific evidences from the lab, explain your answer THOROUGHLY. It has to be bonded together but this is not a chemical change because it is not bonded together * Please clean up the lab stations back to how you found it!

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