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Basic Chemistry Practice Test: Modern Materials
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Basic Chemistry Practice Test: Modern Materials
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25 Questions

1. Cholesteric liquid crystals are colored because __________.
2. A biomaterial intended for use as a long-term replacement of a bone must __________.
3. The monomer that is polymerized to make natural rubber is __________.
4. Vulcanization involves heating rubber with sulfur dioxide to produce a thermosetting polymer.
5. A plasticizer makes a polymer more pliable by reducing the interactions between polymer chains.
6. Polyethylene is formed by a condensation reaction.
7. The empirical formula of an addition polymer __________.
8. As a polymer becomes more crystalline, __________.
9. A __________ liquid crystal has the least order and is the most liquid-like.
10. There are __________ different amino acids present in most proteins.
11. Which of the following is most likely to exhibit liquid-crystalline behavior?
12. A sample of natural rubber (200.0 g) is vulcanized, with the complete consumption of 4.8 g of sulfur. Natural rubber is a polymer of isoprene (C5H8 ) . Four sulfur atoms are used in each crosslink connection. What percent of the isoprene units will be crosslinked?
13. Materials that eventually break down in the body __________.
14. In what year was the first systematic work involving liquid crystals reported?
15. The material first shown to exhibit what we now call superconductivity was __________.
16. Superconductors exhibit the Meissner effect.
17. In the context of biopolymers, the opposite of the polymerization process is __________.
18. Molecules containing only single bonds do not exhibit liquid-crystal behavior because free rotation can occur around single bonds making these molecules flexible.
19. In the smectic A liquid-crystalline phase, __________.
20. Which type of liquid crystal is colored and changes color with temperature?
21. For a given substance that exhibits liquid-crystalline properties, the liquid-crystalline state exists __________.
22. Which of the following is not a biopolymer? protein polysaccharide polyurethane RNA DNA
23. Biocompatibility means that material is __________.
24. The formation of a condensation polymer generally involves __________.
25. A material is sintered by __________.

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