Deck 13: Crystalline Solids and Modern Materials

Question 1

In a semiconductor,the bonding molecular orbitals that contain electrons are referred to as the ________,while the antibonding orbitals that are completely empty are referred to as the ________.

A) single bond, antibond
B) conduction band, valence band
C) valence band, conduction band
D) n-type, p-type
E) p-type, n-type

Answer 1

valence band, conduction band

Question 2

A common use of polyvinyl chloride is

A) plumbing.
B) paint.
C) plastic bottles.
D) styrofoam.
E) all of the above.

Answer 2

plumbing.

Question 3

When an X-ray beam with a wavelength of 180 pm strikes the surface of a crystal,it produces a maximum reflection at an angle of 54.0°.If n=1,what is the separation between layers of atoms in the crystal?

A) 151 nm
B) 38.9 mm
C) 111 nm
D) 55.3 nm
E) 83.5 nm

Answer 3

111 nm

Question 4

Which of the following represent the addition polymer formed from the compound below?
CH₂=CHCl

A)
B)
C)
D)
E)

Question 5

All of the following are examples of allotropes of carbon EXCEPT

A) graphite
B) glass
C) diamond
D) graphine
E) all of the above

Question 6

Identify the type of solid for ice.

A) metallic atomic solid
B) ionic solid
C) nonbonding atomic solid
D) molecular solid
E) networking atomic solid

Question 7

Identify the type of solid for AgCl.

A) metallic atomic solid
B) ionic solid
C) nonbonding atomic solid
D) molecular solid
E) networking atomic solid

Question 8

A metal crystallizes in a face centered cubic structure and has a density of 11.9 g/cm³.If the radius of the metal atom is 138 pm,what is the identity of the metal?

A) At
B) Pd
C) Mn
D) Fe
E) Cr

Question 9

Which of the following represent the addition polymer formed from the compound below?
CH₂=CH-CH₃

A)
B)
C)
D)
E)

Question 10

Diamond crystallizes in a cubic lattice with an edge length of 357 pm.If there are a total of 8 carbon atoms in the unit cell,what is the density of diamond?

A) 12.9 g/cm³
B) 3.54 g/cm³
C) 8.26 g/cm³
D) 2.26 g/cm³
E) 6.20 g/cm³

Question 11

Identify the type of solid for argon.

A) metallic atomic solid
B) ionic solid
C) nonbonding atomic solid
D) molecular solid
E) networking atomic solid

Question 12

Which of the following is an example of a polymer?

A) polyvinyl chloride
B) polystyrene
C) nylon
D) polyurethane
E) all of the above

Question 13

When an X-ray beam strikes the surface of a crystal with a lattice spacing of 145 nm,it produces a maximum reflection at an angle of 41.0°.What is the wavelength of the X-ray with a value of n=1?

A) 130°
B) 164°
C) 158°
D) 190°
E) 167°

Question 14

Identify the type of solid for diamond.

A) metallic atomic solid
B) ionic solid
C) nonbonding atomic solid
D) molecular solid
E) networking atomic solid

Question 15

Determine the radius of an Al atom (in pm)if the density of aluminum is 2.71 g/cm³.Aluminum crystallizes in a face centered cubic structure with an edge length of 2 r.

A) 143 pm
B) 227 pm
C) 96 pm
D) 172 pm
E) 193 pm

Question 16

A common use of polyurethane is

A) spray-on insulation.
B) water-protective coating.
C) foam furniture stuffing.
D) automotive parts.
E) all of the above.

Question 17

When an X-ray beam with a wavelength of 120 pm strikes the surface of a crystal with a lattice spacing of 165 nm,what is the maximum reflection angle with a value of n=1?

A) 54.0°
B) 21.3°
C) 32.6°
D) 18.4°
E) 38.3°

Question 18

Vanadium crystallizes in a body centered cubic structure and has an atomic radius of 131 pm.Determine the density of vanadium,if the edge length of a bcc structure is 4r/ .

A) 3.06 g/cm³
B) 12.2 g/cm³
C) 6.11 g/cm³
D) 2.77 g/cm³
E) 8.46 g/cm³

Question 19

Identify the type of solid for gold.

A) metallic atomic solid
B) ionic solid
C) nonbonding atomic solid
D) molecular solid
E) networking atomic solid

Question 20

Vanadium crystallizes in a body centered cubic structure.If the edge length of the unit cell is 301 pm,what is the radius?

A) 238 pm
B) 301 pm
C) 130 pm
D) 89.0 pm
E) 157 pm

Question 21

Lithium crystallizes in a body-centered cubic structure.What is the coordination number of each atom?

A) 4
B) 6
C) 8
D) 12

Question 22

Give the coordination number for a body-centered cubic cell.

A) 0
B) 6
C) 8
D) 10
E) 12

Question 23

Nickel has a face-centered cubic structure and has a density of 8.90 g/cm³.What is its atomic radius?

A) 125 pm
B) 249 pm
C) 353 pm
D) 997 pm

Question 24

Which of the following is considered a molecular solid?

A) Au
B) NH₄NO₃
C) I₂
D) Rn
E) None of these is a molecular solid.

Question 25

Which of the following is considered a nonbonding atomic solid?

A) Ne
B) Cu
C) I₂
D) Ca
E) K

Question 26

Which type of bonding does Sr form upon solidification?

A) covalent network
B) ionic
C) metallic
D) molecular

Question 27

Which of the following is considered an atomic solid?

A) F₂
B) CsBr
C) N₂
D) Nb
E) None of these is an atomic solid.

Question 28

Which of the following forms a molecular solid?

A) CaO
B) C₁₀H₂₂
C) C, graphite
D) gold

Question 29

What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of 128 pm?

A) 181 pm
B) 362 pm
C) 512 pm
D) 1020 pm

Question 30

Gold crystallizes in a face-centered cubic structure.What is the edge length of the unit cell if the atomic radius of gold is 144 pm?

A) 204 pm
B) 288 pm
C) 333 pm
D) 407 pm

Question 31

How many H^- ions are around each Na⁺ ion in NaH,which has a cubic unit cell with H^- ions on each corner and each face?

A) 1
B) 4
C) 6
D) 8

Question 32

A polymer that eliminates an atom or small group of atoms is known as a(n)

A) addition polymer
B) condensation polymer
C) dimer
D) copolymer
E) substituted polymer

Question 33

Which of the following substances should have the highest melting point?

A) CO₂
B) SrS
C) Kr
D) F₂
E) MgO

Question 34

Which of the following forms an ionic solid?

A) Ag
B) C₇H₁₅NH₂
C) Rb I
D) S O₃

Question 35

Which of the following is considered an ionic solid?

A) (NH₄)₂CO₃
B) CBr₄
C) SeBr₂
D) XeF₄
E) None of these is an ionic solid.

Question 36

Which of the following substances should have the highest melting point?

A) Fe
B) Ne
C) Xe
D) N₂
E) CO

Question 37

Cesium has a radius of 272 pm and crystallizes in a body-centered cubic structure.What is the edge length of the unit cell?

A) 314 pm
B) 385 pm
C) 544 pm
D) 628 pm

Question 38

Na Cl crystallizes in a cubic unit cell with Cl^- ions on each corner and each face.How many Na⁺ and Cl^- ions are in each unit cell of Na Cl?

A) 1 Na⁺ ion and 1 Cl^- ion
B) 2 Na⁺ ions and 2 Cl^- ions
C) 4 Na⁺ ions and 4 Cl^- ions
D) 8 Na⁺ ions and 8 Cl^- ions

Question 39

A common use of polyethylene is

A) insulation.
B) bottles.
C) pipe fitting.
D) film for meat packaging.
E) carpet fibers.

Question 40

Identify the copolymer.

A) nylon 6,6
B) polyvinyl chloride
C) polyethylene
D) polypropylene
E) polystyrene

Question 41

Give the edge length in terms of r for a simple cubic cell.

Question 42

What material needs to be added to portland cement in order to form concrete?

A) neon
B) nitrogen
C) lead
D) sand
E) soda ash

Question 43

Which of the following can act as a p-type semiconductor for silicon?

A) fluorine
B) gallium
C) oxygen
D) phosphorus
E) arsenic