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02 Atomic Bonding and Crystal Structures Online Quiz Questions

Use this free practice quiz with 20 questions to review 02 Atomic Bonding and Crystal Structures, test your knowledge, and prepare for your next test or exam.

20 questions
01
Written response
1 point

How many atoms are in the conventional unit cell of the hexagonal close-packed (HCP) structure?

02
Written response
1 point

What is the coordination number of an atom in an FCC crystal structure?

03
Choose one
1 point

An ionic crystal does not conduct electricity as a solid but can conduct when molten. What change on melting best explains this difference?

  1. A

    Electrons become delocalized throughout the solid.

  2. B

    Ions become mobile and can carry electric charge.

  3. C

    The ions stop attracting one another.

  4. D

    The solid becomes a collection of separate, neutral ion pairs.

04
True or false
1 point

True or false: In every crystal system, the direction [hkl] is perpendicular to the plane (hkl).

  1. A

    True

  2. B

    False

05
Choose one
1 point

A metal can often deform without shattering when layers of atoms shift. Which feature of metallic bonding helps explain this behavior?

  1. A

    Directional covalent bonds keep the atoms locked in fixed arrangements.

  2. B

    Oppositely charged ions form a rigid lattice that prevents layer movement.

  3. C

    Delocalized electrons help accommodate shifts between atomic layers.

  4. D

    Secondary interactions hold the metal together more strongly than primary bonds.

06
Choose one
1 point

A conventional BCC cell has eight corner atoms, each shared by neighboring cells, and one atom at its center. How many atoms does the cell contain after accounting for sharing?

  1. A

    2 atoms

  2. B

    4 atoms

  3. C

    8 atoms

  4. D

    9 atoms

07
Written response
1 point

A plane intercepts the a and b axes at one cell length each and is parallel to the c axis. Enter its Miller indices.

08
Choose one
1 point

Two metals are close-packed, but one has an FCC structure and the other an HCP structure. Which statement correctly distinguishes their layer stacking?

  1. A

    FCC stacks ABAB, while HCP stacks ABCABC.

  2. B

    FCC stacks ABCABC, while HCP stacks ABAB.

  3. C

    Both stack ABCABC.

  4. D

    Both stack ABAB.

09
Choose one
1 point

In a zinc blende crystal, how many nearest neighbors of opposite charge surround each ion?

  1. A

    Two oppositely charged nearest neighbors

  2. B

    Three oppositely charged nearest neighbors

  3. C

    Four oppositely charged nearest neighbors

  4. D

    Six oppositely charged nearest neighbors

10
Choose one
1 point

A CsCl conventional cell has a body-center position and corner positions, but CsCl is not a BCC Bravais lattice. Why not?

  1. A

    The corner and center positions are the same ion, so the cell is a BCC Bravais lattice.

  2. B

    The corner and center positions represent different ions, so the structure is not a BCC Bravais lattice.

  3. C

    The structure has no repeating lattice.

  4. D

    The structure is a BCC Bravais lattice because every ion has eight neighbors.

11
Choose one
1 point

In the fluorite structure of CaF₂, which statement correctly describes the nearest-neighbor coordination?

  1. A

    Each fluorine ion has four calcium neighbors.

  2. B

    Each fluorine ion has eight calcium neighbors.

  3. C

    Each calcium ion has four fluorine neighbors.

  4. D

    Each calcium ion has six fluorine neighbors.

12
Written response
1 point

A solid is held together by shared electrons concentrated between particular atoms, and its bonds favor specific arrangements. What bonding type best describes it?

13
Choose one
1 point

A crystal is described by a regular array of lattice points, with an atom or group of atoms associated with each point. What is that atom or group of atoms called?

  1. A

    The unit cell

  2. B

    The basis

  3. C

    The coordination number

  4. D

    The interaxial angles

14
Choose all
1 point

Select all statements supported by the material about the atomic packing factors of common metal structures.

  1. A

    FCC and HCP have an atomic packing factor of about 0.74 and are close-packed.

  2. B

    BCC is not close-packed and has an atomic packing factor of about 0.68.

  3. C

    BCC has a greater atomic packing factor than FCC.

  4. D

    An atomic packing factor of about 0.74 uniquely identifies FCC.

  5. E

    Every metal adopts one of these three structures under all conditions.

15
Choose all
1 point

A materials scientist is considering forces between polymer chains and between layers in a solid. Select all statements that correctly describe secondary interactions such as van der Waals forces and hydrogen bonding.

  1. A

    They are generally weaker than primary bonds.

  2. B

    They can be important between polymer chains.

  3. C

    They are always too weak to affect material behavior.

  4. D

    They occur only between separate molecules, never between layers in a solid.

16
True or false
1 point

A conventional unit cell must always be the smallest cell that represents the lattice.

  1. A

    True

  2. B

    False

17
True or false
1 point

A metal can adopt different crystal structures under different temperature or pressure conditions.

  1. A

    True

  2. B

    False

18
Fill in the blank
1 point

In a crystal description, the atom or group of atoms associated with each lattice point is the .

19
Fill in the blank
1 point

The coordination number of an atom counts its .

20
Open ended
1 point

Explain why knowing a ceramic's chemical formula alone is not enough to determine its crystal structure. Include at least one factor that helps determine how its ions are arranged.