slime

Title of Lab: _Polymer chemistry: Slime

Name: ____________________________ block _____________

Information: Polyvinyl acetate (PVA or PVAc) is a rubbery synthetic polymer. Polyvinyl acetate is also the raw material to make Polyvinyl alcohol.

Polyvinyl alcohol has excellent film forming, emulsifying, and adhesive properties. It is also resistant to oil, grease and solvent. It is odorless and nontoxic. It has high tensile strength and flexibility, as well as high oxygen and aroma barrier properties. However these properties are dependent on humidity, in other words, with higher humidity more water is absorbed.

Elmer’s white glue contains a mixture of the two polymers. In this lab, you will learn a new and fun way to use it.

Materials: _ Graduated cylinder (<50mL) , 500 mL beaker, 140 mL beaker, 50 mL beaker, Sodium tetraborate decahydrate powder, 120 ml bottle of PVA glue, Distilled water , food coloring

If you want to take your sample home, you must provide a ziplock bag. Pour the slime into your bag and write your name, it will be kept in the fridge until the end of the school day.

Procedure:

1. Pour the 30 mL of PVA glue into the 50 mL beaker

2. add 20 mL of H₂O to the 50 mL mL beaker. Stir.

3. Five drops of Food coloring

4. 90 ml of distilled water into the 500 mL beaker + 2.5 g Sodium tetraborate decahydrate powder. Mix well.

5. Slowly add the PVA mixture to the 500 mL beaker, stirring as you do so.

6. Place the thick slime that forms into your hand and knead until it feels dry. (There will be an excess of water remaining in the bowl.)

7. It will be wet, stringy and messy at first, but the more you play with it, the better it mixes and the less sticky and firmer it becomes. Store your slime in a zip-lock in the fridge.

Prelab:

Reaction: (the subscript of ‘n’ means that molecule is in a chain and varies in numbers of attached monomers within the solution)

1. In this reaction, what is the mol ratio between Na₂B₄O₇ and H₂O? _____________________________________________________________________________________

2. What is the mol ratio for everything? ____________________________________________________

Observation:

3. How long did the entire reaction take? _____________________________________________

4. Describe what happened in detail_________________________________________________

_____________________________________________________________________________

Calculations:

5. Determine the AMU of the molecules C₄H₆O₂,

__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

6. Determine the percent composition of the elements in: C₄H₆O₂

7. Determine the AMU of the molecule C₁₆H₁₀Na₂O₇S₂N₂ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________

8. Determine the percent composition of the elements in: C₁₆H₁₀Na₂O₇S₂N₂ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ _____________________________________________________________________________________

9. Since you started with 30 mL – which is equivalent to 30 g – of polyvinyl acetate (C₄H₆O₂); how many moles did you start with?

__________________________________________________________________________________________

10. Using your answer from #9, how many moles of Borax (Na₂B₄O₇) were required for the reaction to work in this experiment?

__________________________________________________________________________________________

Lesson Plan: Stoichiometry 2 Lab

Created by: Laura Peck

Standards: TN Chemistry standard 3221.3.8; 3224.Math.3; 3224.Math.7; 3224.3.7; SPI3221.Math.4; SPI3221.3.5. CLE3224.3.1,

Time: 10 minutes for lab, 20 minutes for lab write up

Reaction:

Goal:

- Students will develop a deeper understanding of the chemistry foundations of different industries.

- Students will become more confident in standard chemistry calculations such as: AMU, % composition, mols, stoichiometry

- Students will become more confident in converting chemical equations to word equations.

Hazards: Do not consume.

Materials: Graduated cylinder (<50mL) , 500 mL beaker, 140 mL beaker, 50 mL beaker, Sodium tetraborate decahydrate powder, 120 ml bottle of PVA glue, Distilled water , food coloring

Laboratory procedures: as outlined in included student lab write up form. Teacher will supervise at all times.

Diverse learners: Grading scale of lab reports and other modifications will be made depending on individual need.

Prior Learning: Through the use of pre-test, formative assessments, and coverage of chemical reaction types prior to demonstration – the teacher will ensure that they have a solid foundation of knowledge from which to pull from.

Extended Learning: Other demonstration labs, hands on reaction labs, summative assessment. Students may even use this reaction at home during halloween.