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MATSE Exam/ Practice Exam Questions with Correct Verified Answers/ Rated A+
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1MATSE Exam/ Practice Exam Questions with Correct
Verified Answers/ Rated A+
Metallic bonds are different from covalent bonds in that the shared valence electrons are delocalized.
True or False? - ANS - True
Aluminum has a face centered cubic (feck) structure with an atomic radius of 0.143 nm and an atomic
weight of 26.98 g/mol. (a) Calculate the density of Al from this information. (b) What is the planar
density of atoms in the (110) plane.
A. (a) 1.35 g/L, (b) 6.11 atoms/nm^2
B. (a) 2.71 g/L, (b) 8.64 atoms/nm^2
C. (a) 0.678 g/L, (b) 8.64 atoms/nm^2
D. (a) 2.71 g/L, (b) 6.11 atoms/nm^2 - ANS - B. (a) 2.71 g/L, (b) 8.64 atoms/nm^2
Ethane (CH3CH3) and Fluor methane (CH3F) have the same number of electrons and are essentially the
same size. However, ethane has a boiling point of 184.5C and fluor methane has a boiling point of
194.7C. Which answer best explains this 10-degree difference in boiling point in terms of the van der
Waals forces present.
A. It has nothing to do with van der Waals
B. Both molecules have both dispersion and orientation forces present, but fluor methane is a slightly
larger molecule
C. Both molecules have dispersion forces, but fluor methane also has orientation forces present
D. Both molecules are non-polar, but fluor methane is a slightly larger molecule - ANS - C. Both
molecules have dispersion forces, but fluor methane also has orientation forces present
, 2
Covalent interactions are generally long range (i.e., greater than 10 nm).
True or false - ANS – False
The number of vacancies per cm^3 in gold at 900C is?
A. 1.93x10^17/cm^3
B. 3.64x10^18/cm^3
C. 6.51x10^22/cm^3
D. 5.90x10^22/cm^3 - ANS - B. 3.64x10^18/cm^3
Hydrogen bonding is predominately found between polar molecules
True or False - ANS - True
Describe all types of bonding that you would expect to exist in each of the following compounds: a
silicon carbide crystal
A. Predominantly covalent and some ionic
B. Predominantly ionic and some covalent
C. Equally ionic and covalent
D. Ionic only - ANS - A. Predominantly covalent and some ionic
The first five peaks of the x-ray diffraction pattern for tungsten, which has a BCC crystal structure; an x-
ray source with a wavelength of 0.1542 nm was used.11. What are the indices (hill) for the first three
peaks?
A. (110), (111), (200)
B. (111), (200), (220)
C. (100), (110), (111)
D. (110), (200), (211) - ANS - D. (110), (200), (211)
, 3
Describe all types of bonding that you would expect to exist in each of the following compounds:
potassium fluoride (KF)
A. Predominantly covalent and some ionic
B. Predominantly ionic and some covalent
C. Equally ionic and covalent
D. Ionic only - ANS - B. Predominantly ionic and some covalent
Describe all types of bonding that you would expect to exist in each of the following compounds: an alloy
composed of 90%Al, 7%Si, 3%Mg
A. ionic, covalent and metallic
B. metallic only
C. metallic and ionic
D. metallic and van der wails - ANS - D. metallic and van der wails
Describe all types of bonding that you would expect to exist in each of the following compounds: zirconia
(ZrO2)
A. predominantly ionic and some covalent
B. Predominantly covalent and some ionic
C. ionic only
D. covalent only - ANS - A. predominantly ionic and some covalent
Describe all types of bonding that you would expect to exist in each of the following compounds: ice
A. predominantly ionic and some covalent
B. van der Waals only
C. predominantly covalent, some ionic and van der Waals
D. predominantly ionic and some van der Waals - ANS - predominantly covalent, some ionic and van der
Waals
, 4
Covalent bonding occurs as a result of columbic attraction and the transfer of valence electrons. True or
False? - ANS - False
The density of niobium is 8.58g/cm3. Its atomic mass is 92.91 g/mol and its structure is bcc. (a) Calculate
the lattice parameter and the atomic radius from this information. (b) What is the planar density of
atoms in the (110) plane.
A. (a) a = 0.330 cm; R = 0.143 cm, (b) 26.0 atoms/nm^2
B. (a) a = 0.330 nm; R = 0.467 nm, (b) 13.0 atoms/nm^2
C. (a) a = 0.330 nm; R = 0.143 nm, (b) 13.0 atoms/nm^2
D. (a) a = 0.330 nm; R = 0.117 nm, (b) 26.0 atoms/nm^2 - ANS - C. (a) a = 0.330 nm; R = 0.143 nm, (b)
13.0 atoms/nm^2
Long Range Order (LRO) - ANS - refers to a repeating, or periodic, structure of atoms. When LRO exists,
the material has a crystalline structure where the building blocks are unit cells. all metals
the first five peaks of the x-ray diffraction pattern for tungsten, which has a BCC crystal structure; an x-
ray source with a wavelength of 0.1542 nm was used.12. Determine the interplanar spacings for the first
two peaks
A. first peak = 0.228 nm; second peak = 0.159 nm
B. first peak = 0.1.59 nm; second peak = 0.228 nm
C. first peak = 0.121 nm; second peak = 0.091 nm
D. first peak = 0.091 nm; second peak = 0.121 nm - ANS - A. first peak = 0.228 nm; second peak = 0.159
nm
the first five peaks of the x-ray diffraction pattern for tungsten, which has a BCC crystal structure; an x-
ray source with a wavelength of 0.1542 nm was used.13. Determine the lattice parameter
A. 0.228 nm
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