Question 1

A rock salt structure has smaller ions in ________

Accepted Answer

A)  cubic holes. 
B)  tetrahedral holes. 
C)  hexagonal holes. 
D)  octahedral holes. 
E)  the usual atomic positions in the unit cell, i.e., not in holes. 
A)  cubic holes. 
B)  tetrahedral holes. 
C)  hexagonal holes. 
D)  octahedral holes. 
E)  the usual atomic positions in the unit cell, i.e., not in holes.

Question 2

Aluminum (Al) has a density of 2.70 g/cm3 and crystallizes in a face-centered cubic structure. What is the unit cell edge length?

Accepted Answer

A)  2.47 *10-3 pm 
B)  40.0 pm 
C)  405 pm 
D)  321 pm 
E)  255 pm 
A)  2.47 *10-3 pm 
B)  40.0 pm 
C)  405 pm 
D)  321 pm 
E)  255 pm

Question 3

The Meissner effect is ________

Accepted Answer

A)  the repulsion of a superconductor by a magnetic field. 
B)  the scattering of electrons in ceramics. 
C)  the tunneling of electrons through a solid. 
D)  the acceleration of electrons in a particle accelerator. 
E)  the superconduction of materials below their critical temperature. 
A)  the repulsion of a superconductor by a magnetic field. 
B)  the scattering of electrons in ceramics. 
C)  the tunneling of electrons through a solid. 
D)  the acceleration of electrons in a particle accelerator. 
E)  the superconduction of materials below their critical temperature.

Question 4

A face-centered cubic unit cell has a(n) ________ in its center.

Accepted Answer

A)  tetrahedral hole 
B)  octahedral hole 
C)  atom 
D)  square planar hole 
E)  cubic hole 
A)  tetrahedral hole 
B)  octahedral hole 
C)  atom 
D)  square planar hole 
E)  cubic hole

Question 5

The two types of closest-packed lattices are ________

Accepted Answer

A)  cubic closest-packed and face-centered cubic. 
B)  cubic closest-packed and hexagonal closest-packed. 
C)  cubic closest-packed and random closest-packed. 
D)  cubic closest-packed and pyramidal closest-packed. 
E)  simple cubic and hexagonal closest-packed. 
A)  cubic closest-packed and face-centered cubic. 
B)  cubic closest-packed and hexagonal closest-packed. 
C)  cubic closest-packed and random closest-packed. 
D)  cubic closest-packed and pyramidal closest-packed. 
E)  simple cubic and hexagonal closest-packed.

Question 6

The face-centered cubic structure is also known as ________

Accepted Answer

A)  cubic closest-packed. 
B)  hexagonal closest-packed. 
C)  square closest-packed. 
D)  spherical closest-packed. 
E)  none of the above, as it is not a closest-packed pattern. 
A)  cubic closest-packed. 
B)  hexagonal closest-packed. 
C)  square closest-packed. 
D)  spherical closest-packed. 
E)  none of the above, as it is not a closest-packed pattern.

Question 7

When Ge is doped with Ga, it produces a(n) ________-type semiconductor.

Accepted Answer

A)  p 
B)  n 
C)  q 
D)  np 
E)  No semiconductor will be produced. 
A)  p 
B)  n 
C)  q 
D)  np 
E)  No semiconductor will be produced.

Question 8

If an X-ray with a wavelength of 154 pm is diffracted at an angle 2$\theta$= 14.6°, according to the Bragg equation (n$\lambda$ = 2 d sin$\theta$), what is the distance between layers of the crystal that give rise to this diffraction? Assume n = 1 in this problem.

Accepted Answer

A)  610.9 pm 
B)  305.5 pm 
C)  606.0 pm 
D)  1212 pm 
E)  198.1 pm 
A)  610.9 pm 
B)  305.5 pm 
C)  606.0 pm 
D)  1212 pm 
E)  198.1 pm

Question 9

Bronze that is composed of 10% tin and 90% copper is ________

Accepted Answer

A)  a substitutional alloy. 
B)  an interstitial alloy. 
C)  a doped semiconductor. 
D)  a colloidal alloy. 
E)  an intermetallic compound. 
A)  a substitutional alloy. 
B)  an interstitial alloy. 
C)  a doped semiconductor. 
D)  a colloidal alloy. 
E)  an intermetallic compound.

Question 10

How many nearest neighbor atoms are there around each atom in a body-centered cubic unit cell?

Accepted Answer

A)  4 
B)  6 
C)  8 
D)  10 
E)  12 
A)  4 
B)  6 
C)  8 
D)  10 
E)  12

Question 11

At a historic Civil War battleground, a stack of cannonballs looked like the picture below on the far left. Removing the top cannonball resulted in the middle view, and removing the next layer resulted in the view on the right. What sort of packing was used in stacking the cannonballs?

Accepted Answer

A)  cannonball closest-packed 
B)  hexagonal closest-packed 
C)  cubic closest-packed 
D)  random-packed 
E)  body-centered closest-packed 
A)  cannonball closest-packed 
B)  hexagonal closest-packed 
C)  cubic closest-packed 
D)  random-packed 
E)  body-centered closest-packed

Question 12

Metal solids are good conductors of electricity because ________

Accepted Answer

A)  they are easily ionized. 
B)  their valence electrons are not localized. 
C)  they are easily reduced and oxidized. 
D)  they can be drawn into wires. 
E)  they are ductile. 
A)  they are easily ionized. 
B)  their valence electrons are not localized. 
C)  they are easily reduced and oxidized. 
D)  they can be drawn into wires. 
E)  they are ductile.

Question 13

Which statement A-D does not describe a simple cubic unit cell?

Accepted Answer

A)  It results from square packing of atoms in layers. 
B)  The atoms lie at the corners of a cube. 
C)  Each atom has 6 nearest neighbors. 
D)  The stacking pattern can be represented by aaaa. 
E)  Statements A-D all correctly describe a simple cubic unit cell. 
A)  It results from square packing of atoms in layers. 
B)  The atoms lie at the corners of a cube. 
C)  Each atom has 6 nearest neighbors. 
D)  The stacking pattern can be represented by aaaa. 
E)  Statements A-D all correctly describe a simple cubic unit cell.

Question 14

Which statement about a semiconductor is not correct?

Accepted Answer

A)  Both electrons in the conduction band and holes in the valence band conduct electricity. 
B)  The band gap becomes smaller with increasing temperature. 
C)  The band gap is smaller than in an insulator. 
D)  Adding an impurity can increase the conductivity. 
E)  Conductivity increases with increasing temperature. 
A)  Both electrons in the conduction band and holes in the valence band conduct electricity. 
B)  The band gap becomes smaller with increasing temperature. 
C)  The band gap is smaller than in an insulator. 
D)  Adding an impurity can increase the conductivity. 
E)  Conductivity increases with increasing temperature.

Question 15

Which statement regarding the formation of an alloy is correct?

Accepted Answer

A)  Carbon forms an interstitial alloy with iron because their atomic radii are about the same. 
B)  Carbon forms a substitutional alloy with iron because their atomic radii are about the same. 
C)  Carbon forms an interstitial alloy with iron because carbon has a much smaller atomic radius. 
D)  Carbon forms a substitutional alloy with iron because carbon has a much smaller atomic radius. 
E)  Carbon forms an interstitial alloy with iron because carbon has a much larger atomic radius. 
A)  Carbon forms an interstitial alloy with iron because their atomic radii are about the same. 
B)  Carbon forms a substitutional alloy with iron because their atomic radii are about the same. 
C)  Carbon forms an interstitial alloy with iron because carbon has a much smaller atomic radius. 
D)  Carbon forms a substitutional alloy with iron because carbon has a much smaller atomic radius. 
E)  Carbon forms an interstitial alloy with iron because carbon has a much larger atomic radius.

Question 16

Which element would be used to dope germanium to produce an n-type semiconductor?

Accepted Answer

A)  Ga 
B)  Sn 
C)  Si 
D)  As 
E)  Cu 
A)  Ga 
B)  Sn 
C)  Si 
D)  As 
E)  Cu

Question 17

The hexagonal closest-packed crystal structure has a ________ layering pattern that produces a ________ unit cell.

Accepted Answer

A)  ababab; hexagonal 
B)  ababab; face-centered cubic 
C)  abcabcabc; hexagonal 
D)  abcabcabc; face-centered cubic 
E)  abcabcabc; body-centered cubic 
A)  ababab; hexagonal 
B)  ababab; face-centered cubic 
C)  abcabcabc; hexagonal 
D)  abcabcabc; face-centered cubic 
E)  abcabcabc; body-centered cubic

Question 18

Ionic solids have ________ melting points, and are ________.

Accepted Answer

A)  high; malleable 
B)  high; brittle 
C)  low; malleable 
D)  low; brittle 
E)  high; soft 
A)  high; malleable 
B)  high; brittle 
C)  low; malleable 
D)  low; brittle 
E)  high; soft

Question 19

When Ge is doped with Ga, it produces a(n) ________-type semiconductor.

Accepted Answer

The answer of When Ge is doped with Ga, it...

Question 20

The property of superconducting ceramics that makes them a potential technology for levitating trains is ________

Accepted Answer

A)  antigravity. 
B)  the Meissner effect. 
C)  Brownian motion. 
D)  resistive heating. 
E)  Cooper pairing of yttrium and barium. 
A)  antigravity. 
B)  the Meissner effect. 
C)  Brownian motion. 
D)  resistive heating. 
E)  Cooper pairing of yttrium and barium.

Exam 12: Solids: Structures and Applications

A rock salt structure has smaller ions in ________

Aluminum (Al) has a density of 2.70 g/cm3 and crystallizes in a face-centered cubic structure. What is the unit cell edge length?

The Meissner effect is ________

A face-centered cubic unit cell has a(n) ________ in its center.

The two types of closest-packed lattices are ________

The face-centered cubic structure is also known as ________

When Ge is doped with Ga, it produces a(n) ________-type semiconductor.

If an X-ray with a wavelength of 154 pm is diffracted at an angle 2 θ\thetaθ = 14.6°, according to the Bragg equation (n λ\lambdaλ = 2 d sin θ\thetaθ ), what is the distance between layers of the crystal that give rise to this diffraction? Assume n = 1 in this problem.

Bronze that is composed of 10% tin and 90% copper is ________

How many nearest neighbor atoms are there around each atom in a body-centered cubic unit cell?

At a historic Civil War battleground, a stack of cannonballs looked like the picture below on the far left. Removing the top cannonball resulted in the middle view, and removing the next layer resulted in the view on the right. What sort of packing was used in stacking the cannonballs?

Metal solids are good conductors of electricity because ________

Which statement A-D does not describe a simple cubic unit cell?

Which statement about a semiconductor is not correct?

Which statement regarding the formation of an alloy is correct?

Which element would be used to dope germanium to produce an n-type semiconductor?

The hexagonal closest-packed crystal structure has a ________ layering pattern that produces a ________ unit cell.

Ionic solids have ________ melting points, and are ________.

When Ge is doped with Ga, it produces a(n) ________-type semiconductor.

The property of superconducting ceramics that makes them a potential technology for levitating trains is ________

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: the Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Organic Chemistry: Fuels, Pharmaceuticals, Materials, and Life

Chemical Kinetics: Reactions in the Air We Breathe

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acid-Base and Solubility Equilibria: Reactions in Soil and Water

Metal Ions: Colorful and Essential

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: the Quest for Clean Energy

Biochemistry: the Compounds of Life

Nuclear Chemistry: Applications to Energy and Medicine

Life and the Periodic Table

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Aluminum (Al) has a density of 2.70 g/cm³ and crystallizes in a face-centered cubic structure. What is the unit cell edge length?

If an X-ray with a wavelength of 154 pm is diffracted at an angle 2 $\theta$ = 14.6°, according to the Bragg equation (n $\lambda$ = 2 d sin $\theta$ ), what is the distance between layers of the crystal that give rise to this diffraction? Assume n = 1 in this problem.

The hexagonal closest-packed crystal structure has a layering pattern that produces a unit cell.

Ionic solids have melting points, and are .