Experimentation: 1-Cut the rubber band to make a rubber strip. 2-Fill the jug ha

Question

Experimentation:

1-Cut the rubber band to make a rubber strip.

2-Fill the jug half-full of tap water

3-Tie the end of the rubber strip to the jug, and the other end to the door handle.

4-Measure the initial length of rubber strip when it hangs to the door handle with the jug

5-Use one cube of ice on each side of the rubber strip and cool the length of the rubber band by rubbing one ice cube on each side simultaneously. Then, measure the length of the rubber strip.

6-Allow the rubber strip to come to room temperature.

7-Heat the rubber band using the blow dryer. Move the blow dryer up and down the length of the rubber band to heat it. Then, measure the length of the rubber strip.

8-Repeat steps 5 to 7 three times or more until the results are consistent.

Cooling process:

Initial length of rubber strip: 25 metric

Trails

The length of rubber strip

1

27

2

27

3

28

4

28

Heating process:

Initial length of rubber strip: 25 metric

Trails

The length of rubber strip

1

23

2

22

3

22

4

22

1.Explain what seems to have happened; what did the rubber band do?

2.Explain at a molecular level what most substances do when heated and cooled.

3.Relate what happened in terms of entropy. Be sure to include something about temperature and entropy.)

4.What would you expect to happen to the temperature of a rubber band if you suddenly stretched it?

5.How about if you slowly stretched a rubber band and then suddenly let it contract?

6.Shrink- wrap uses heat (without melting it) to seal something in a special type of plastic. Explain how this must work.

7.Write a mathematical formula that includes entropy. Explain each of the terms in the formula.

Trails

The length of rubber strip

1

27

2

27

3

28

4

28

Explanation / Answer

4) you'll see that in the middle they all line up in straight lines pointing from your left hand to your right hand. You've created order out of a mess, and you've reduced the entropy in the system. The system gives out heat.

3) when the entropy goes down, the system gives out heat, and when the entropy goes up, the system takes in heat from around it.

2). Rubber bands are unusual because they are made from loosely-packed chains of atoms .If all the chains are neatly lined up in rows, we say that the entropy is very low. If they are all tangled up in a mess, we say that the entropy is high. all we need to know here is, the messier the system, the higher the entropy.

1) here when we heated length of rubber strip have decrease and when we cooled length of rubber strip have increase.

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