BME 350 QUIZ 2 QUESTIONS WITH VERIFIED ANSWERS
Correct 75
Incorrect 00
1 of 75
Term
When the SIO2 tetrahedra change orientation and lose density, this
means the material will _____________________
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increase in volume and exert
elongate
great force doing so
increase in volume contact
Don't know?
2 of 75
,Term
Why do materials engineers perform metallographic examination of
material surfaces
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observe structure to assess crystallinity, seek information about macroscopic
material performance obtainable from micro structure, measure grain size,
examine grain boundaries
analyze chemical composition, identify surface defects, evaluate thermal
conductivity
measure elasticity, observe color changes, study thermal expansion
determine density, assess hardness, examine chemical bonds
Don't know?
3 of 75
Term
You are told that each unit cell of a material is of the composition MC
where M is a metal and X is a nonmetal. Based on this description, you
assume that the material is a:
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, polymer glass
metal ceramic
Don't know?
4 of 75
Term
The general rule for adding interstitial atoms inside FCC and HCP unit
cells is that the added atoms must have a radius that is less than
approximately _________________ percent of the atoms comprising the FCC
and HCP unit cells.
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20 5
10 15
Don't know?
5 of 75
Term
, One of the simplest ceramics considered in your text was NaCl. The
text notes that the unit cell of this ceramic material ahs 2 ions, Na and
Cl which are ___________________ each lattice point.
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associated with instead of
located near in addition to
Don't know?
6 of 75
Term
Assuming that:
1. r is the radius of an atom
2. a is the unit cell axis length
3. the annotation ^ indicates "raised to the power"
the "empty space" inside a BCC crystal is given by which of the
following expressions:
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a^3 - 16/3 pi(r*3) a^2 + 4/3 pi(r*3)
Correct 75
Incorrect 00
1 of 75
Term
When the SIO2 tetrahedra change orientation and lose density, this
means the material will _____________________
Give this one a try later!
increase in volume and exert
elongate
great force doing so
increase in volume contact
Don't know?
2 of 75
,Term
Why do materials engineers perform metallographic examination of
material surfaces
Give this one a try later!
observe structure to assess crystallinity, seek information about macroscopic
material performance obtainable from micro structure, measure grain size,
examine grain boundaries
analyze chemical composition, identify surface defects, evaluate thermal
conductivity
measure elasticity, observe color changes, study thermal expansion
determine density, assess hardness, examine chemical bonds
Don't know?
3 of 75
Term
You are told that each unit cell of a material is of the composition MC
where M is a metal and X is a nonmetal. Based on this description, you
assume that the material is a:
Give this one a try later!
, polymer glass
metal ceramic
Don't know?
4 of 75
Term
The general rule for adding interstitial atoms inside FCC and HCP unit
cells is that the added atoms must have a radius that is less than
approximately _________________ percent of the atoms comprising the FCC
and HCP unit cells.
Give this one a try later!
20 5
10 15
Don't know?
5 of 75
Term
, One of the simplest ceramics considered in your text was NaCl. The
text notes that the unit cell of this ceramic material ahs 2 ions, Na and
Cl which are ___________________ each lattice point.
Give this one a try later!
associated with instead of
located near in addition to
Don't know?
6 of 75
Term
Assuming that:
1. r is the radius of an atom
2. a is the unit cell axis length
3. the annotation ^ indicates "raised to the power"
the "empty space" inside a BCC crystal is given by which of the
following expressions:
Give this one a try later!
a^3 - 16/3 pi(r*3) a^2 + 4/3 pi(r*3)
