A solid has a very high melting point, great hardness, and poor
electrical conduction. This is a(n) ________ solid.
D) covalent network
E) metallic and covalent network
All of the following are a type of solid except ________.
D) covalent network
Crystalline solids differ from amorphous solids in that crystalline
solids have ________.
A) appreciable intermolecular attractive forces
B) a long-range repeating pattern of atoms, molecules, or ions
C) atoms, molecules, or ions that are close together
D) much larger atoms, molecules, or ions
E) no orderly structure
The unit cell with all sides the same length and all angles equal to
90° that has lattice points only at the corners is called
B) body-centered cubic
C) primitive cubic
D) face-centered cubic
E) spherical cubic
All of the following can form a solid with a lattice structure
similar to that of sodium chloride except ________.
Consider the following statements about crystalline solids:
(i) Molecules or atoms in molecular solids are held together via
(ii) Metallic solids have atoms in the points of the crystal lattice.
(iii) Ionic solids have formula units in the point of the crystal lattice.
(iv) Molecules in covalent-network solids are connected via a network of covalent bonds.
Which of the statements is true?
The ________ of light waves upon passing through a narrow slit is
What fraction of the volume of each corner atom is actually within
the volume of a face-centered cubic unit cell?
What portion of the volume of each atom or ion on the face of a unit
cell is actually within the unit cell?
D) all of it
E) none of it
A metallic material that is composed of two or more elements is
called a(n) ________.
A) homogeneous mixture
B) pure metal
Which one of the following is a property of most metals?
A) low melting point
C) high electronegativity
D) thermal conductivity
E) acidic oxides
All of the following statements about steel are true except
A) it is an alloy of iron
B) it can have different percentages of carbon
C) it is a monomer
D) it can be made so it resists rust
E) none of the above
For a substitutional alloy to form, the two metals combined must have
A) ionization potential and electron affinity
B) number of valance electrons and electronegativity
C) reduction potential and size
D) atomic radii and chemical bonding properties
E) band gap and reactivity
The addition of an interstitial element to a metal ________ the
overall hardness and strength while ________ the ductility.
A) decreases, increasing
B) increases, increasing
C) increases, decreasing
D) decreases, decreasing
E) Adding an interstitial element to a metal has no affect on its properties.
________ have properties that depend on the manner in which the solid
A) Pure metals
B) Heterogeneous alloys
C) Homogeneous alloys
D) Pure alloys
________ are examples of homogeneous alloys.
A) Covalent compounds
B) Interstitial compounds
C) Intermetallic compounds
D) Intrametallic compounds
E) Ionic compounds.
________ generally differ from compounds in that the atomic ratios of
the constituent elements in the former are ________ and may vary over
a wide range.
A) Pure metals, fixed
B) Alloys, not fixed
C) Pure metals, not fixed
D) Alloys, fixed
E) Solids, not fixed
Of the following, ________ may be added to steel to modify its
A) carbon only
B) carbon and nickel
C) nickel only
D) copper only
E) none of the above
Metallic solids exhibit all of the following except ________.
A) thermal conductivity
C) electrical conductivity
D) variable melting point
E) variable hardness
Trends in melting points for metals can be explained with the
A) intermolecular model
B) electron-sea model
C) thermal conductivity model
D) covalent bonding model
E) ionic bonding model
If the electronic structure of a solid substance consists of a
valence band that is completely filled with electrons and there is a
large energy gap to the next set of orbitals, then this substance will
be a(n) ________.
CsCl crystallizes in a unit cell that contains a Cs+ ion at the
center of a cube and a Cl- ion at each corner. The unit cell of CsCl
A) close packed
B) body-centered cubic
C) face-centered cubic
E) primitive cubic
NaCl crystallizes in a face-centered cubic cell. What is the total
number of ions (Na+ ions and Cl- ions) that lie within a unit cell of
KF crystallizes in a face-centered cubic cell. What is the total
number of ions (K+ ions and F- ions) that lie within a unit cell of
CsCl crystallizes in a unit cell that contains the Cs+ ion at the
center of a cube that has a Cl- at each corner. Each unit cell
contains ________ Cs+ ion(s) and ________ Cl- ion(s),
A) 1, 8
B) 2, 1
C) 1, 1
D) 2, 2
E) 2, 4
The process of ________ can produce an n-type semiconductor, which
can greatly increase intrinsic conductivity.
The ________ for Ge shows it to be a semiconductor, because the gap
between the filled lower and empty higher energy bands is relatively
A) molecular-orbital model
B) quantum mechanics model
C) atomic-orbital model
D) valence bond model
E) intermolecular model
How many valence electrons do inorganic compounds contain if they are
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?
A) polyvinyl alcohol
D) polyethylene glycol
All of the following are natural polymers except ________.
The empirical formula of an addition polymer ________.
A) is the same as that of the monomer from which it is formed except that 2 H and 1 O have been subtracted
B) is the same as that of the monomer from which it is formed except that 1 H and 2 O have been subtracted
C) is the same as that of the monomer from which it is formed except that 2 H and 1 C have been added
D) is the same as that of the monomer from which it is formed
E) is different than that of the monomer from which it is formed
An elastomer will fail to regain its original dimensions following a
distortion beyond its ________.
A) glass transition
B) phase boundary
C) London force
E) elastic limit
What happens to a polymer as it becomes more crystalline?
A) its melting point decreases
B) its density decreases
C) its yield stress decreases
D) its stiffness decreases
E) None of the above is correct.
Natural rubber is too soft and chemically reactive for practical
applications. ________ of natural rubber entails crosslinking reactive
polymer chains with sulfur atoms.
The formation of a ________ polymer generally involves the
elimination of a small molecule.
All of the following are classified as a nanomaterial except
A) carbon nanotubes
E) All of the above are classified as nanomaterials
The properties of graphene include ________.
A) large thermal conductivity
B) high strength
C) a zero energy gap
D) A and B
E) A, B and C
Molecular solids consist of atoms or molecules held together by
A) dipole-dipole forces only
B) Metallic bonds only
C) London dispersion forces and hydrogen bonds only
D) hydrogen bonds only
E) dipole-dipole forces, London dispersion forces, and/or hydrogen bonds
An unknown metal crystallizes in a primitive cubic unit cell. The
length of the unit cell edge is 2.85 Å. The radius of the unknown atom
is ________ Å.
E) Insufficient data is given.
An unknown metal crystallizes in a body-centered cubic structure with
a unit cell edge length of 4.35 Å. The radius of the unknown atom is
What is the percent gold in a 14 karat gold ring?
E) 1.0 × 102
What is the percent gold in a 10 karat gold necklace?
D) 1.0 × 102
What is the percent gold in a 24 karat gold bracelet?
What is the percent gold in a 6 karat gold link?
E) 1.0 × 102
Which group of transition metals have the highest melting
The class of ________ has a diamond crystal structure.
A) molecular semiconductors
B) elemental conductors
C) elemental semiconductors
D) nonmetal semiconductors
E) none of the above
Blue LEDs are usually made of ________.
A) gallium arsenide
B) gallium phosphide
C) gallium nitride
D) gallium oxide
E) gallium sulfide
Which category of plastics is the most difficult to recycle?
Which category of plastics will generally be the most easily
When the size of a semiconductor particle or crystal decreases, the
band gap energy ________.
B) remains the same
D) becomes 1
E) goes to zero
Which of the following lattices is one of the five two-dimensional
lattices in which the lattice vectors a and b are equal and the γ
angle between them is 90°?
Which of the following lattices is one of the seven primitive
three-dimensional lattices in which the relationship between the
lattice vectors a, b, and c can be written as: a ≠ b ≠ c?
Which statement best describes the classification of Sterling
A) It is pure silver.
B) It is oxidized silver.
C) It is an alloy of silver.
D) It is a mixture of silver and gold.
E) It is a liquid at room temperature.
All of the following are alloys except ________.
A) sterling silver
B) 14-karat gold
D) dental amalgam
E) yellow brass
Which of the following can be used as an elemental
Which of the following will have a larger band gap: GaN, GaP, GaAs,
E) All choices have identical band gaps.
All of the following are polymers except ________.
Which monomer is polymerized to make natural rubber?
Which of the following is an addition polymer?
A) polyethylene terephthalate
C) Nylon 6,6
D) polyvinyl chloride
Which of the following is a condensation polymer?
A) polyvinyl chloride
D) Nylon 6,6
What is the correct abbreviation for the polymer low-density
Define a primitive cubic lattice.
when lattice points occur only at the corners of a unit cell
Define a body-centered cubic lattice.
when lattice points occur at the corners and at the center of a unit cell
Define a face-centered cubic lattice.
when lattice points occur at the center of each face, as well as each corner of a unit cell
What is an alloy?
a material that contains more than one element and has the characteristic properties of metals
A face-centered cubic unit cell contains contains ________ atoms.
An unknown metal crystallizes in a body-centered cubic unit cell. There are ________ atoms of the unknown metal per unit cell.
What two primary metals are alloyed to produce bronze?
copper and tin
Semiconductors are ________ conductive than metals because of a band gap.
What are semiconductors?
materials characterized by an energy gap between a filled valence band and an empty conduction band
What is doping in the semiconductor field?
the process of adding controlled amounts of impurity atoms to a material
The dopant atoms in an ________ semiconductor have more electrons than the host material.
Quantum dots can be found as particles in semiconductors. What is the average diameter of quantum dots?
What is the chemical formula for the monomer that forms polyethylene?
What two compounds react to form the polymer Nylon?
hexamethylen diamine and adipic acid
When two different monomers combine to form a polymer, the resulting compound is called a ________.
HDPE stands for ________.
________ are solid-state materials that can be made either semiconducting or metallic without any doping.
The type of solid that is characterized by low melting point, softness, and low electrical conduction is a molecular solid.
Many metals are ductile, which means that they can be drawn into thin wires.
An insulator does not conduct electricity.
Polyethylene is formed by a condensation reaction.
Vulcanization of natural rubber entails crosslinking reactive polymer chains with sulfur atoms.
Thermoplastics cannot be reshaped.