Lab Report- slime exp PDF

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The Elasticity of Sime LaKim Brown Natural Science Lab – C683

Section I: Introduction and Literature Review

A. Over the course of the last few month I have been making slime at home with my kids. We have used many different ingredients and have discovered many different outcomes to the way it looks and feels based off of the different ingredients. For this experiment I want to see what effect does the amount of activator in slime have on the elasticity of it. Slime is a mixture of household items that come together to create a non- Newtonian fluid. Which means it isn’t just a solid, liquid or gas. Instead it acts like both a solid and a liquid. Slimes’ primary ingredients are school glue, activator such as borax and water. After doing some research I was able to find the science behind the slime. Slime is made of a polymer which is materials made of long, repeating chains of molecules. The polymer in slime is white school glue, that contains polyvinyl acetate (Rohrig, 2004). A polymer can bend easily and slide past each other, allowing them to act like a liquid, pour, and take the shape of their container. The second ingredient in slime is called the activator. The activator can be many different things, such as contact solution, shaving cream, or borax. For our Slime experiment we will use Borax as the activator. Borax is a solid called sodium tetraborate (Krantz, 2004). When dissolved in water, the solution contains lots of borate ions. Mixing the polyvinyl acetate with the borate ions, will cause them to hook those huge polymer chains together in a process called cross-linking. The chains get all tangled up, and they start to act more like a solid which you can stretch and squeeze. Thus creating slime.

Section II: Hypothesis B. My hypothesis: I predict that the increase in borax will decrease the elasticity of the slime compared to slime created with less borax.

C. I am basing this hypothesis off the research showing that the borax ion will hook to the polyvinyl acetate to form a chain to make the mixture solid. I assume that increasing the amount of borax will create a tighter chain which will decrease the elasticity of the slime.

Section III: Method

D. The independent variable is the amount of borax used in the mixture. The amount will be measured per tablespoon.

E. The dependent variable will be the elasticity of the slime. This will be measured by timing the rate of how fast the slime stretches from a height of 2 ft to the floor. This will be recorded three trials each for accuracy and represented in a table form.

F. I will be controlling for the following confounding variables: o Amount of school glue used to create slime. o Amount of water used to create slime. o Height from which the slime will be tested.

G. Materials and Measurements: To create Slime ▫ ▫ ▫ ▫ ▫

8oz White School Glue 2 cups Tap Water 1tbsp Borax / 4tbsp Borax 2 mixing bowls 1 drop Food coloring

Other tools ▫ Timer ▫ Measuring tape ▫ A white board to record

H. Experimental Procedure: Step 1: Make Slime For Slime A: Microwave 1 cup of water for a minute, until it is hot but not boiling. Dissolve the 1 tbsp of Borax in the hot water. Pour 8oz white school glue into a bowl. Fill the glue bottle with remaining 1 cup of water, shake it around to dislodge any leftover glue, and pour it into the glue in the bowl. Mix the glue and water together until it is smooth.

Pour the Borax water mixture a little at a time into the glue mixture and stir. The slime will begin to form almost instantly and continue to form as you add the Borax solution and mix it up. Once you have it mixed, pull it out of the liquids and knead it until it is no longer sticky. * add a drop of red food coloring* (Helmenstine, 2018). For Slime B: Repeat above steps but dissolve 4tbsp of borax into 1 cup of water instead. * add a drop of blue food coloring* Trials Drop Slime A from counter height and time how long it takes the slime to hit the floor. Record and repeat 3X Complete and record results for Slime B Section IV: Results I. Summary: J. Data Table & Graph Trials 1 2 3 Average Time

Slime A

Slime B

Section V: Conclusion K. Hypothesis confirmed? L. M. Section VI: Sources Helmenstine, A., PH. D. (2018, December 3). Making Slime with Borax and White Glue Takes Just Minutes. Retrieved June 23, 2020, from https://www.thoughtco.com/step-by-step-slimeinstructions-604173 Krantz, P. D. (2004). Inquiry, slime, and the national standards. Science Activities, 41(3), 22-25. Rohrig, B. (2004). The Science of Slime!. ChemMatters, 13....