WorksheetsCh.12: Solids and Modern Materials_I
Total questions: 46
Worksheet time: 30mins
A gas is __________ and assumes __________ of its container, whereas a solid is __________ and has __________ .
compressible, the volume and shape, not compressible, the definite shape.
condensed, the volume and shape, condensed, the volume and shape
compressible, the shape, compressible, the volume and shape
Crystalline solids differ from amorphous solids in that crystalline solids have __________.
a long-range repeating pattern of atoms, molecules, or ions
randomly arranged atoms
no long-range order
similar properties in all directions
A metallic material that is composed of two or more elements is called a(n) __________.
alloy
mineral
nanomaterial
pure metal
Ionic solids exhibit all the following except __________.
hardness
poor thermal conductivity
high melting point
brittleness
A unit cell that contains an atom at each of the 6 face centers and an atom in each of the 8 corners of a cube. The unit cell is _______.
primitive cubic
body-centered cubic
face-centered cubic
amorphous
Which of the following best describes substitutional alloys?
A second element fills an empty space within the lattice
A second element fills the empty outer space of the lattice
A second element takes the place of an atom
The components are evenly mixed throughout
How many atoms are there in a body-centered cubic unit cell?
8×81+1 = 2 atoms
8×81=1 atom per unit cell
8×81+6×21=4 atoms
None of the above
State True or False: Nanomaterials have dimensions on the scale of 1 – 100nm.
True
False
State True or False: Ionic solids are long chains of atoms held together by covalent bonds.
True
False
State True or False: In molecular solids, the cations are held together by a sea of shared valence electrons.
True
False
Which of the following is the smallest repeating unit in a crystal?
Molecule
Lattice point
Unit cell
Crystal system
Which of the following is an example of a covalent-network solid?
Sodium chloride
Diamond
Brass
Ice
Which of the following is an example of a semiconductor?
Silicon dioxide
Copper
Germanium
Sodium
State True or False: Electrical conductivity of a semiconductor is influenced by doping.
True
False
Solid is a state of matter that has a (a)
definite shape/size and tightly packed particles.
no definite shape and loose particles
particles that move quickly and has no shape.
Which form of matter has a definite shape and takes up space (has definite volume)?
liquid
solid
gas
clay
The molecules in the picture are tightly held together with little movement. They have shape and energy. Therefore, the picture represents _________.
solid
liquid
gas
plasma
The diagram shows the way the particles of a solid occupy space. Select the property of a solid that is consistent with this micro-view.
No define shape
Cannot be compressed
No definite volume
Salt is considered a crystalline solid because its particles are...
arranged in a regular pattern.
arranged randomly.
completely motionless.
able to move around one another.
______________________ solids and their particles are arranged in no regular pattern and soften gradually over a range of temperatures.
Crystalline
Amorphous
Match the following
Steel
alloy
CO2 (s)
molecular solid
Graphite
network covalent solid
CaCO3
ionic solid
A certain crystalline substance that has a low melting point does not conduct electricity in solution or when melted. This substance is likely to be
an ionic solid
a covalent network solid
a metallic solid
a molecular solid
SiO2 (quartz) and diamonds are ____________________, and they have very high boiling/melting points.
covalent network solids
ionic solids
molecular solids
interstitial alloys
Ionic Solids Have
a low melting point
a moderate melting point
a high melting point
none of these
Solid whose particles are held together by covalent bonds
Metallic Solid
Covalent network solid
Ionic solid
LDPE stands for....
Low Density Polyethylene
Low Density Polypropylene
Low Draft Polyethylene
Less Dorky Plastic Engineer
Type of doping which creates extra electrons
n
p
parallel
perpendicular
Holes formed by doping has a _______charge
positive
negative
neutral
0
Average number of valence electron per atom in a compound semiconductors
4
8
12
1
Polymers can be stiffened through
cross-linking
alloying
ordering
close packing
Doping enhances the______ of a material.
brittleness
electrical conductivity
thermal conductivity
ductility
Type of polymerization reaction which breaks the double bond of monomers
addition
condensation
oxidation
carboxylation
Starch is composed of what monomers?
sucrose
glucose
nucleic acids
glycogen
Proteins are composed of what smaller subunits?
amino acids
nucleic acids
fatty acids
nucleotides
What does the word polymer means ?
chain-like molecules
repeated linking of large number of small molecules
Many parts or units
is a very large, chain-like molecule made up of monomers, which are small molecules
What are the types of polymers based on source of availability
Thermosetting, thermoplastic
Synthetic,natural
Homomer, co-polymer
Addition ,condensation
What is the classification of polymer based on Polymerisation
Linear,branched, crosslinked
Addition, condensation
Natural, synthetic
Homomer, co-polymer
Which of the following reaction is NOT accompanied by elimination of a byproduct molecule?
addition polymerization
condensation polymerization
both of the mentioned
none of the mentioned
In ----------- polymerization reactions, same monomer undergo polymerization.
copolymerization
condensation
addition
bulk
In ------------ polymerization, two different monomers are involved with the elimination of small molecules.
addition
condensation
copolymerization
bulk
The small molecules that make up larger molecules.
monomer
polymer
synthetic
plastic
Melting and mixing 2 or more metals together creates an
(a)
What is the small repeating entity of the atom structure?
Crystal lattice
Unit cell
Crystal structure
Shape
__________ is the manner in which atoms, ions, or molecules are spatially arranged.
Pattern
Ionic bond
Crystal structure
Molecular formula
Multiple unit cells stacked together in an infinite 3D array of points makes up what?
Unit cell
Molecular formula
Crystal lattice
Ionic bond
This crystal system has angles that all meet at 90°, but one of the axes is not equal to the other 2: a=b≠c and α=β=γ= 90°
Hexagonal
Isometric
Tetragonal
Orthorhombic
