(a) Explain why stretching an elastomer causes an unstable state and, therefore, when the stretching force is removed, why the elastomer recovers. (b) Explain why stretching of some polyethylene molecules results in "blushing" a situation not eliminated when the stretching force is removed
What will be an ideal response?
(a)The entropy of the system decreases when the polymer is stretched because the stretching causes the molecules to become aligned and, therefore, more ordered. Increases in order cause decreases in entropy which causes a net increase in free energy and, therefore, the state is unstable. When the stretching force is removed, the entropy can increase and thus the energy will decrease, causing a return to the original state.
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? Identify and state the historical significance of the Pottawatomie Creek massacre.
What will be an ideal response?
__________ refers to dust rising high into the air and being carried long distances
Fill in the blank(s) with the appropriate word(s).
All inorganic material comes from nonliving sources and does not contain carbon
Indicate whether the statement is true or false
Myths and faulty reasons for breeding dogs and cats include:
A. Breeding dogs and cats is a good way to make money B. My dog/cat is really great and I want to raise another one just like it C. My pet will miss out on an important part of life if not given the opportunity to reproduce D. All of the above E. A and B above