Cross Linking Glue With Borax

STQ: What is the change in physical properties of a polymer in the results of cross-linking?

Hypothesis: Bonding the glue and the Borax and water will cause it to be thicker and a slight puddy like form and texture.

Procedures: Add 1 tablespoon of Borax powder to 100 mL of water in the 600 mL beaker and stir. Measure out 25 mL Elmer’s Glue in the 250 mL beaker and add 5 mL of water and stir. Mix 40 mL of Borax solution to the glue solution and stir vigorously for a little while and it will change to a puddy like substance. You can now dump out the rest of the water once you have taken out your puddy.

Results:

It looks sort of clumpy as the picture shows and feels quite gooey and squishy, and smells like glue of course. On a scale of 1-5 for slimness is a 2. When you poke it slowly it sort of goes concave and then goes back to normal. My finger does not go through at all! When you poke it fast the same thing happens. When you stretch it slowly it will strech quite a bit then break, but if you do it fast it will immediately snap into 2 pieces. When flattening it it becomes flat then goes back to the way it was before. When dropped from 30 cm it bounced back 15 cm.
1.)How is slime viso-elastic?
It was viso-elastic because it always tried to go back to the original shape.

2.)What are the physical properties that change as a result of the addition of sodium
It started to get a puddy like texture and the glue and Borox bonded together.

3.)What would be the effect of adding more sodium borate to your cup?
I think it would hold the puddy together longer if more Borox solution was added.

4.)How does water affect elasticity of the palmer?
Water held the puddy together better so when it dried the more brittle it was. Elasticity is the stretchiness of an item.

5.)What is the repeating molecule?
The repeating molecules were as shown in number 6

6.)What is the structural formula of the poly(vinvyl alcohol) monomer?
H3-C2-OH

7.)Circle the borax cross-linking agent.
Out of the two pictures the one with the B in the middle is the Borox cross-linking agent.

Conclusion!
Well we made a polymer our of our monomers! Exactly how I believed my hypothesis to be! This could help because it gives us experience in how to make polymers! There needs to be at least two monomers and a cross-linking agent! The only problem we had was a little hiccup when we had a teaspoon and it said 1 tablespoon, but a group member helped me remember it was 3 teaspoons per 1 tablespoon. We could use this to perhaps recreate the experiment to make puddy for little siblings to goof around with! Adding more Borox could perhaps change the thickness or the strength of the puddy.

ChemThink; Chemical Reactions

1.)Reactants

2.)Products

3.)A chemical change has take place.

4.) Rearrangement

5.)breaking and forming

6.)the same atoms

7.)missing or new

8.)rearrange the bonds

9.)2 and 2, 1, 1.

10.)2,1,1

11.)The Law of Conservation Mass

12.)atoms and atoms

13.)2,1,2

14.)1,2,11

15.)Cu,O

16.)O,Cu,Cu

17.)2,1,2,2,2,2,2

18.)1,4,2,1

19.)1,3,2

20.)2,2,3

21.)4,3,2

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1.)Breaking bonds, making bonds, or both

2.)the same present atoms before and after the reaction

3.)coefficients, atom

Chemical Reactions Demonstration

For the first demonstration we put 25 mL of ethanol into a 2 L bottle and swirled it all around and stuff. Then she swirled around the capped bottle. She poured out the ethanol into the trash when most of it turned into gas. Then she put a barbecue lighter to the top of the bottle. So when the ethanol hit the torch it produced combustion! Now for the next experiment she put vinegar and then baking soda into a beaker. Then lit two candles. So when the ingredients mixed in the beaker we got carbon dioxide! So with the two candles lit. She "poured" the gas emitted from the mixing of the two reactants onto the flame emitted from the candles and the flame went out entirely! This was because the carbon dioxide took away the oxygen the flame needed. The last experiment was we had chlorine and zinc. We poured 200 mL of the chlorine into our new clean beaker. Then added zinc. This caused another chemical reaction! The mixture produced a very flammable gas. Then we put our barbecue lighter to the gas and the mixture was immediately set on fire.

Chemistry: Temperature vs. Dissolve Time Lab

Question: How can temperature affect chemical reaction

Hypothesis: Higher temperature will mean less dissolving time.

Temp: 56 Celsius Time: 23.3 Seconds

Temp: 25.9 Celsius Time: 31.2 Seconds

Temp: 0.8 Celsius Time: 2 Minutes 40 Seconds

Freezing and Melting Water Lab Post

Question: How do freezing and melting points differ?

Hypothesis: The temperature of water will be colder when it is in the ice because to become ice it needs less energy

Freezing Point: -6.058
Melting Point: 0.07935

Questions about the lab:

1) The water temperature during freezing went downward during the 10 minute stirring period, then when we left it still for 5 minutes the temperature went up but was still in the negative.

2) In the freezing period the freezing point was -6.1 C then the melting point was 0.1 C

3) The freezing was a lot colder than melting for obvious reasons.

4a) The beginning the kinetic energy increased at the end it decreased

4b) The kinetic energy was constant throughout

4c) The kinetic energy increased.

4d) It remained constant!