Question 1

List the five elements that are classified as semiconductors.

Accepted Answer

boron, silicon, germanium, ars

Question 2

If an X-ray with a wavelength of 185 pm is diffracted at an angle 2$\theta$=16. , 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) 629.4 pm 
D) 1260 pm 
E) 198.1 pm 
A) 610.9 pm 
B) 305.5 pm 
C) 629.4 pm 
D) 1260 pm 
E) 198.1 pm

Question 3

If a body-centered cubic unit cell has a volume of 1.447 *108 pm3, what must be the dimension of the cube's edge in picometers?

Accepted Answer

The answer of If a body-centered cubic unit cell has...

Question 4

How many nearest neighbor atoms are there around each atom in a simple 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 5

In an XRD analysis using a wavelength of 154 pm, a crystalline sample of a layered VO(PO4)(H2O) structure gave peaks at 24. , 36.  and 48. .What is likely to be the value of the distance between the layers?

Accepted Answer

A) 731 pm 
B) 367 pm 
C) 103 pm 
D) 188 pm 
E) 55.1 pm 
A) 731 pm 
B) 367 pm 
C) 103 pm 
D) 188 pm 
E) 55.1 pm

Question 6

In the solid-state structure of sodium chloride, the closest distance between the centers of ions is observed

Accepted Answer

A) between adjacent sodium ions on the edge of the unit cell. 
B) between adjacent chloride ions on the edge of the unit cell. 
C) between adjacent sodium ions on the face and one corner of the unit cell. 
D) between adjacent chloride ions on the face and one corner of the unit cell. 
E) between all adjacent sodium and chloride ions. 
A) between adjacent sodium ions on the edge of the unit cell. 
B) between adjacent chloride ions on the edge of the unit cell. 
C) between adjacent sodium ions on the face and one corner of the unit cell. 
D) between adjacent chloride ions on the face and one corner of the unit cell. 
E) between all adjacent sodium and chloride ions.

Question 7

Band theory of bonding in solids

Accepted Answer

A) is an extension of molecular orbital theory. 
B) describes bonds as rubber bands. 
C) does not apply to any type of solid other than metals. 
D) explains bond formation in metals but not their physical properties. 
E) All of these are correct. 
A) is an extension of molecular orbital theory. 
B) describes bonds as rubber bands. 
C) does not apply to any type of solid other than metals. 
D) explains bond formation in metals but not their physical properties. 
E) All of these are correct.

Question 8

Iron crystallizes in a body-centered cubic pattern.How many iron atoms are in each unit cell?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 8 
E) 9 
A) 1 
B) 2 
C) 4 
D) 8 
E) 9

Question 9

The $\alpha$ form of polonium (Po) crystallizes as a simple cubic unit cell with an edge length of 335 pm.What is the atomic radius of polonium in picometers?

Accepted Answer

The answer of The $\alpha$ form of polonium (Po) crystallizes...

Question 10

Which of the following elements are found as covalent network solids? 
I.beryllium, Be
II.carbon, C
III.phosphorus, P
IV.sulfur, S

Accepted Answer

A) I and II 
B) I and III 
C) II and III 
D) II and IV 
E) III and IV 
A) I and II 
B) I and III 
C) II and III 
D) II and IV 
E) III and IV

Question 11

Nickel (Ni) has a face-centered cubic structure with a unit cell edge length of 352.4 pm.What is the calculated value of the density of nickel in g/cm3 based on this information?

Accepted Answer

Question 12

As an analog of graphite, a material composed of boron and nitrogen B-N) has been prepared.Why do these elements make a good substitute for the element in graphite? 
I.They are all elements with electrons in the 2p subshell.
II.The sum of the valence electrons of one boron atom and one nitrogen atom is the same as the number of valence electrons on two carbon atoms.
III.Boron and nitrogen have suitable 2p orbital overlap.

Accepted Answer

A) I only 
B) II only 
C) III only 
D) I and II only 
E) I, II, and III 
A) I only 
B) II only 
C) III only 
D) I and II only 
E) I, II, and III

Question 13

The center of a cubic hole is found

Accepted Answer

A) at the center of a simple cubic lattice. 
B) on the edges of a simple cubic lattice. 
C) on the faces of a body-centered cubic lattice. 
D) at the center of a face-centered cubic lattice. 
E) at eight sites within a face-centered cubic lattice. 
A) at the center of a simple cubic lattice. 
B) on the edges of a simple cubic lattice. 
C) on the faces of a body-centered cubic lattice. 
D) at the center of a face-centered cubic lattice. 
E) at eight sites within a face-centered cubic lattice.

Question 14

The hybridization of carbon in diamond is

Accepted Answer

A) sp. 
B) both sp2 and sp3. 
C) sp2. 
D) sp3. 
E) dsp3. 
A) sp. 
B) both sp2 and sp3. 
C) sp2. 
D) sp3. 
E) dsp3.

Question 15

Which of the following can contain only an element of a single type?

Accepted Answer

A) metal 
B) alloy 
C) molecular solid 
D) ionic solid 
E) ceramic 
A) metal 
B) alloy 
C) molecular solid 
D) ionic solid 
E) ceramic

Question 16

In ionic solids, one ion often occupies a hole in the unit cell defined by the other ion.In a body-centered cubic cell, what are the types and numbers of each hole?

Accepted Answer

type: octa

Question 17

What is packing efficiency in relation to crystal structures and unit cells?

Accepted Answer

Packing efficiency is the perc

Question 18

Which of the following refers to an alloy in which the composition of the elements is variable, and one element must have a much smaller radius than the other?

Accepted Answer

A) intermetallic 
B) interstitial 
C) stoichiometric 
D) substitutional 
E) inhomogeneous 
A) intermetallic 
B) interstitial 
C) stoichiometric 
D) substitutional 
E) inhomogeneous

Question 19

The diffraction pattern of an NaCl crystal is measured with 154-nm light from a copper source.Constructive interference is seen at 2$\theta$ = 22.4$\degree$.What is the minimum spacing between layers giving rise to this pattern?

Accepted Answer

The answer of The diffraction pattern of an NaCl crystal...

Question 20

An ionic compound of iron and sulfur has a crystal structure in which sulfide ions create an fcc lattice and iron ions occupy half of the available tetrahedral holes.What is the empirical formula of the compound?

Accepted Answer

A) FeS2 
B) FeS 
C) Fe2S3 
D) Fe3S4 
E) More information is needed. 
A) FeS2 
B) FeS 
C) Fe2S3 
D) Fe3S4 
E) More information is needed.

List the five elements that are classified as semiconductors.

If a body-centered cubic unit cell has a volume of 1.447 *10⁸ pm³, what must be the dimension of the cube's edge in picometers?

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

In the solid-state structure of sodium chloride, the closest distance between the centers of ions is observed

Band theory of bonding in solids

Iron crystallizes in a body-centered cubic pattern.How many iron atoms are in each unit cell?

The $\alpha$ form of polonium (Po) crystallizes as a simple cubic unit cell with an edge length of 335 pm.What is the atomic radius of polonium in picometers?

Which of the following elements are found as covalent network solids? I.beryllium, Be II.carbon, C III.phosphorus, P IV.sulfur, S

Nickel (Ni) has a face-centered cubic structure with a unit cell edge length of 352.4 pm.What is the calculated value of the density of nickel in g/cm³ based on this information?

The center of a cubic hole is found

The hybridization of carbon in diamond is

Which of the following can contain only an element of a single type?

In ionic solids, one ion often occupies a hole in the unit cell defined by the other ion.In a body-centered cubic cell, what are the types and numbers of each hole?

What is packing efficiency in relation to crystal structures and unit cells?

Which of the following refers to an alloy in which the composition of the elements is variable, and one element must have a much smaller radius than the other?

The diffraction pattern of an NaCl crystal is measured with 154-nm light from a copper source.Constructive interference is seen at 2 $\theta$ = 22.4 $\degree$ .What is the minimum spacing between layers giving rise to this pattern?

An ionic compound of iron and sulfur has a crystal structure in which sulfide ions create an fcc lattice and iron ions occupy half of the available tetrahedral holes.What is the empirical formula of the compound?

Matter and Energy an Atomic Perspective

Atoms, Ions, and Molecules the Building Blocks of Matter

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Stoichiometry Mass Relationships and Chemical Reactions

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Properties of Solutions Their Concentrations and Colligative Properties

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

Exam 18: The Solid State a Particulate View

List the five elements that are classified as semiconductors.

If an X-ray with a wavelength of 185 pm is diffracted at an angle 2 θ\thetaθ =16.9, 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.

If a body-centered cubic unit cell has a volume of 1.447 *108 pm3, what must be the dimension of the cube's edge in picometers?

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

In an XRD analysis using a wavelength of 154 pm, a crystalline sample of a layered VO(PO4)(H2O) structure gave peaks at 24.2, 36.311eed92e_4ca6_1627_a0ba_7d04770a237c_TB6562_11 and 48.411eed92e_4ca6_1627_a0ba_7d04770a237c_TB6562_11.What is likely to be the value of the distance between the layers?

In the solid-state structure of sodium chloride, the closest distance between the centers of ions is observed

Band theory of bonding in solids

Iron crystallizes in a body-centered cubic pattern.How many iron atoms are in each unit cell?

The α\alphaα form of polonium (Po) crystallizes as a simple cubic unit cell with an edge length of 335 pm.What is the atomic radius of polonium in picometers?

Which of the following elements are found as covalent network solids? I.beryllium, Be II.carbon, C III.phosphorus, P IV.sulfur, S

Nickel (Ni) has a face-centered cubic structure with a unit cell edge length of 352.4 pm.What is the calculated value of the density of nickel in g/cm3 based on this information?

The center of a cubic hole is found

The hybridization of carbon in diamond is

Which of the following can contain only an element of a single type?

In ionic solids, one ion often occupies a hole in the unit cell defined by the other ion.In a body-centered cubic cell, what are the types and numbers of each hole?

What is packing efficiency in relation to crystal structures and unit cells?

Which of the following refers to an alloy in which the composition of the elements is variable, and one element must have a much smaller radius than the other?

The diffraction pattern of an NaCl crystal is measured with 154-nm light from a copper source.Constructive interference is seen at 2 θ\thetaθ = 22.4 °\degree° .What is the minimum spacing between layers giving rise to this pattern?

An ionic compound of iron and sulfur has a crystal structure in which sulfide ions create an fcc lattice and iron ions occupy half of the available tetrahedral holes.What is the empirical formula of the compound?

Matter and Energy an Atomic Perspective

Atoms, Ions, and Molecules the Building Blocks of Matter

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Stoichiometry Mass Relationships and Chemical Reactions

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Properties of Solutions Their Concentrations and Colligative Properties

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

If a body-centered cubic unit cell has a volume of 1.447 *10⁸ pm³, what must be the dimension of the cube's edge in picometers?

The $\alpha$ form of polonium (Po) crystallizes as a simple cubic unit cell with an edge length of 335 pm.What is the atomic radius of polonium in picometers?

Nickel (Ni) has a face-centered cubic structure with a unit cell edge length of 352.4 pm.What is the calculated value of the density of nickel in g/cm³ based on this information?

The diffraction pattern of an NaCl crystal is measured with 154-nm light from a copper source.Constructive interference is seen at 2 $\theta$ = 22.4 $\degree$ .What is the minimum spacing between layers giving rise to this pattern?