Would you expect polypropylene to be denser or less dense than low-density polyethylene? Why?
A. Polypropylene should be more dense given that the polyethylene is already known to be of low density.
B. Polypropylene should be less dense because its molecules are not able to pack together as tightly.
C. Polypropylene should be more dense because it has a greater molecular mass.
D. Polypropylene should be more dense because its molecules are able to pack more closely together.
Answer: B
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