Question 1

are solid- state materials that can be made either semiconducting or metallic without any doping.

Accepted Answer

The answer of are solid- state materials that can be...

Question 2

are materials characterized by an energy gap between a filled valence band and an empty conduction band.

Accepted Answer

The answer of are materials characterized by an energy gap...

Question 3

The process of adding controlled amounts of impurity atoms to a material is known as
.

Accepted Answer

The answer of The process of adding controlled amounts of...

Question 4

Nylon is formed by the reaction of a with a .

Accepted Answer

The answer of Nylon is formed by the reaction of...

Question 5

Which of the following is not a natural polymer? silk
Starch protein cellulose nylon

Accepted Answer

Nylon is a synthetic polymer, while the other options (cellulose, protein, starch, silk) are all natural polymers.

Question 6

The empirical formula of an addition polymer .

Accepted Answer

The empirical formula of an addition polymer is the same as that of the monomer from which it is formed. This is because during addition polymerization, no atoms are added or subtracted from the monomer, they are simply rearranged to form the polymer. Therefore, the empirical formula remains unchanged.

Question 7

For a given substance that exhibits liquid- crystalline properties, the transition from solid to liquid- crystal state occurs .

Accepted Answer

The answer of For a given substance that exhibits liquid-...

Question 8

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?

Accepted Answer

The answer of A sample of natural rubber (200.0 g)...

Question 9

A material is sintered by .

Accepted Answer

Sintering involves heating a finely divided solid to a high temperature under pressure to form a solid mass without melting it completely.

Question 10

The monomer that is polymerized to make natural rubber is .

Accepted Answer

Natural rubber is made by polymerizing the monomer isoprene.

Question 11

Short, high purity fibers reinforced with aluminum borosilicate fibers are used to manufacture the space shuttle tiles.

Accepted Answer

The answer of Short, high purity fibers reinforced with aluminum...

Question 12

Which of the following is not a biopolymer? protein
Polysaccharide polyurethane RNA
DNA

Accepted Answer

Polyurethane is a synthetic polymer and not a biopolymer, while the others (protein, polysaccharide, RNA, and DNA) are all examples of biopolymers.

Question 13

MRI stands for .

Accepted Answer

MRI stands for Magnetic Resonance Imaging.

Question 14

A _ _ liquid crystal has the least order and is the most liquid- like.

Accepted Answer

The nematic liquid crystal phase has the least order and is the most liquid-like. In this phase, the molecules are oriented in the same direction, but there is no positional order of the molecules.

Question 15

In the smectic A liquid- crystalline phase, _ .

Accepted Answer

The answer of In the smectic A liquid- crystalline phase,...

Question 16

Write the chemical formulas for both polyethylene and the monomer from which it is formed.

Accepted Answer

The answer of Write the chemical formulas for both polyethylene...

Question 17

A category plastic container will generally be the most easily recycled.

Accepted Answer

The answer of A category plastic container will generally be...

Question 18

Which one of the following is an addition polymer with the same structure as polyethylene except that one hydrogen on every other carbon is replaced by a benzene ring?
Polyvinyl chloride polypropylene polystyrene polyurethane nylon 6,6

Accepted Answer

Polystyrene is an addition polymer where a benzene ring replaces one hydrogen on every other carbon in the polyethylene chain.

Question 19

Of the following, only is not a polymer. cellulose
Nylon starch protein
Stainless steel

Accepted Answer

Only stainless steel is not a polymer. Cellulose, nylon, starch, and protein are all examples of polymers.

Question 20

Which type of liquid crystal is colored and changes color with temperature?

Accepted Answer

Cholesteric liquid crystals exhibit iridescence and changes color with temperature due to their helical structure. Smectic and nematic liquid crystals do not exhibit such characteristics. Smectic A, B, and C differ in their layer structure.

Quiz 12: Modern Materials

are solid- state materials that can be made either semiconducting or metallic without any doping.

are materials characterized by an energy gap between a filled valence band and an empty conduction band.

The process of adding controlled amounts of impurity atoms to a material is known as .

Nylon is formed by the reaction of a with a .

Which of the following is not a natural polymer? silk Starch protein cellulose nylon

The empirical formula of an addition polymer .

For a given substance that exhibits liquid- crystalline properties, the transition from solid to liquid- crystal state occurs .

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?

A material is sintered by .

The monomer that is polymerized to make natural rubber is .

Short, high purity fibers reinforced with aluminum borosilicate fibers are used to manufacture the space shuttle tiles.

Which of the following is not a biopolymer? protein Polysaccharide polyurethane RNA DNA

MRI stands for .

A _ _ liquid crystal has the least order and is the most liquid- like.

In the smectic A liquid- crystalline phase, _ .

Write the chemical formulas for both polyethylene and the monomer from which it is formed.

A category plastic container will generally be the most easily recycled.

Which one of the following is an addition polymer with the same structure as polyethylene except that one hydrogen on every other carbon is replaced by a benzene ring? Polyvinyl chloride polypropylene polystyrene polyurethane nylon 6,6

Of the following, only is not a polymer. cellulose Nylon starch protein Stainless steel

Which type of liquid crystal is colored and changes color with temperature?

Quiz 12: Modern Materials

are solid- state materials that can be made either semiconducting or metallic without any doping.

are materials characterized by an energy gap between a filled valence band and an empty conduction band.

The process of adding controlled amounts of impurity atoms to a material is known as .

Nylon is formed by the reaction of a with a .

Which of the following is not a natural polymer? silk Starch protein cellulose nylon

The empirical formula of an addition polymer .

For a given substance that exhibits liquid- crystalline properties, the transition from solid to liquid- crystal state occurs .

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?

A material is sintered by .

The monomer that is polymerized to make natural rubber is .

Short, high purity fibers reinforced with aluminum borosilicate fibers are used to manufacture the space shuttle tiles.

Which of the following is not a biopolymer? protein Polysaccharide polyurethane RNA DNA

MRI stands for .

A _ _ liquid crystal has the least order and is the most liquid- like.

In the smectic A liquid- crystalline phase, _ .

Write the chemical formulas for both polyethylene and the monomer from which it is formed.

A category plastic container will generally be the most easily recycled.

Which one of the following is an addition polymer with the same structure as polyethylene except that one hydrogen on every other carbon is replaced by a benzene ring? Polyvinyl chloride polypropylene polystyrene polyurethane nylon 6,6

Of the following, only is not a polymer. cellulose Nylon starch protein Stainless steel

Which type of liquid crystal is colored and changes color with temperature?

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?