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Exam 12: Modern Materials

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Question 21

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Vulcanization

A) leads to cross-linking of poly-cis-isoprene chains in rubber with sulfur.
B) provides considerable elasticity in rubber.
C) severs the carbon-carbon chain in rubber.
D) provides a smooth surface to rubber.
E) leads to cross-linking of poly-cis-isoprene chains in rubber with sulfur and provides considerable elasticity in rubber.

F) B) and D)
G) C) and D)

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Question 22

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What is the name of the C₆₀ molecule that resembles an architectural structure called a geodesic dome?

A) Graphene
B) Buckminsterfullerene
C) Geodene
D) Soccerballene
E) Buckene

F) D) and E)
G) A) and B)

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Question 23

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Which one of these materials is a copolymer?

A(n)________ __________ is made from two or more substances with different properties that remain separate in the bulk material.

___________ _________ _________ are used in calculators,watches,and laptop computers because polarized light can be transmitted through one phase but not transmitted through another.

_________________ is the process where sulfur is used to create linkages between individual polymer chains in rubber.

Which of the following contains a phenyl group?

What does LDPE mean?

A polymer where the monomers are connected by an amide linkage are called polyamines.

Materials with a small energy gap between the valence band and the conduction band are called

Describe the difference between a semiconductor and an insulator.

Which is the best description for the following structural representation of an addition polymer?

What name is given to the bonds that make rubber much stronger and more rigid than natural polyisoprene (rubber) ?

Which of these polymers is used in disposable cups and plates?

Polyethylene consisting primarily of unbranched chains is known as high-density polyethylene

What type of polymer is represented by the following repeating segment?

The segment represents the polymer named

A peptide bond (also called an amide bond) joins two amino acids together.What atoms are linked by this bond?

Ceramics are polymeric inorganic compounds that have low melting points.

In order to form a condensation polymer from the following monomer,which other monomer should be selected?