MAT E 273 Exam 1 (ISU) Questions Answered Correctly
Which type of bonding generally results in positional constraints on atoms due to the shapes of their
valence electron orbitals ? - Answers Covalent
Which of the following bonding scenarios features charged atom cores surrounded by free electrons ?
(a) Covalent (b) Ionic (c) Metallic (d) Hydrogen (e) Van der Waals - Answers Metallic
_________ bonding is responsible for binding separate sheets of graphene together to form graphite. -
Answers Van der Waals
_________ bonding is responsible for binding separate water molecules together to form a crystal of ice.
- Answers Hydrogen
The most commonly produced structural form of metals can be described as: - Answers Random
Polycrystal
Identify the valid unit cell that conveys the highest symmetry of the following 2-D lattice - Answers
(Hexagon)
How many total iron (Fe) atoms reside with a unit cell of iron that is at 0oC and 1 atmosphere of
pressure ? - Answers 2
Which crystal structure(s) feature an atomic packing factor (APF) of 74%. - Answers FCC & HCP
The mobility of ___________ generally dictates the mechanical properties of most metals that are near
room temperature and under an ambient pressure of 1 atmosphere. - Answers Dislocations
2-fold symmetry - Answers diamond (diad)
3 fold symmetry - Answers triangle (triad)
4-fold symmetry - Answers square (tetrad)
6 fold symmetry - Answers hexagon (hexad)
Anisotropy - Answers directionally dependent (single crystals)
APF SC - Answers .52
APF BCC - Answers .68
APF FCC - Answers .74
Ionic/Covalent Characteristics - Answers Strong, brittle, hard, stiff
Refractory
Which type of bonding generally results in positional constraints on atoms due to the shapes of their
valence electron orbitals ? - Answers Covalent
Which of the following bonding scenarios features charged atom cores surrounded by free electrons ?
(a) Covalent (b) Ionic (c) Metallic (d) Hydrogen (e) Van der Waals - Answers Metallic
_________ bonding is responsible for binding separate sheets of graphene together to form graphite. -
Answers Van der Waals
_________ bonding is responsible for binding separate water molecules together to form a crystal of ice.
- Answers Hydrogen
The most commonly produced structural form of metals can be described as: - Answers Random
Polycrystal
Identify the valid unit cell that conveys the highest symmetry of the following 2-D lattice - Answers
(Hexagon)
How many total iron (Fe) atoms reside with a unit cell of iron that is at 0oC and 1 atmosphere of
pressure ? - Answers 2
Which crystal structure(s) feature an atomic packing factor (APF) of 74%. - Answers FCC & HCP
The mobility of ___________ generally dictates the mechanical properties of most metals that are near
room temperature and under an ambient pressure of 1 atmosphere. - Answers Dislocations
2-fold symmetry - Answers diamond (diad)
3 fold symmetry - Answers triangle (triad)
4-fold symmetry - Answers square (tetrad)
6 fold symmetry - Answers hexagon (hexad)
Anisotropy - Answers directionally dependent (single crystals)
APF SC - Answers .52
APF BCC - Answers .68
APF FCC - Answers .74
Ionic/Covalent Characteristics - Answers Strong, brittle, hard, stiff
Refractory
