Question 1

Which of the following best describes an amorphous solid?

Accepted Answer

Particles are randomly arranged with no discernible long-range order.

Question 2

What is the major electrostatic force found between ammonia (NH$_3$) molecules?

Accepted Answer

Intermolecular forces

Question 3

Which of the following is an example of an ionic solid?

Accepted Answer

AlF$_3$

Question 4

Olive oil slowly hardens and forms a solid over a range of temperatures as it cools. Which best describes olive oil as a solid?

Accepted Answer

Amorphous

Question 5

Compound A is hard, does not conduct electricity, and melts at 1400$^	ext{o}$C. Which type of solid is Compound A?

Accepted Answer

Covalent network solid

Question 6

What is the most basic repeating structure of a crystal lattice?

Accepted Answer

Unit cell

Question 7

How many atoms are present in a simple cubic unit cell?

Accepted Answer

1

Question 8

Which of the following statements about the coordination number in a simple cubic unit cell is correct?

Accepted Answer

Each atom is surrounded by 6 atoms.

Question 9

Polonium crystallizes with a primitive cubic structure. It has a density of 9.4 g/cm$^3$, a radius of 167 pm, and a molar mass of 209 g/mol. Calculate the number of atoms in one mole of polonium.

Accepted Answer

$6.0 	imes 10^{23}$

Question 10

Which of the following best describes the arrangement in a body-centered cubic (BCC) unit cell?

Accepted Answer

Atoms at each corner and one atom in the center

Question 11

Tungsten possesses a body-centered cubic structure. If its density is 19.28 g/cm$^3$, what is its atomic radius in pm?

Accepted Answer

316 pm

Question 12

Vanadium has a body-centered cubic structure. If the atomic radius of vanadium is 134 pm, calculate the density of solid vanadium. (Molar mass = 50.94 g/mol, Avogadro's number = $6.022 	imes 10^{23}$ mol$^{-1}$)

Accepted Answer

5.71 g/cm$^3$

Question 13

The edge of a body-centered cubic unit cell of an element Z was found to be $2.88 	imes 10^{-8}$ cm. The density of the element is 7.2 g/cm$^3$. What is the approximate molar mass of Z?

Accepted Answer

101.7 g/mol

Question 14

How many atoms are present in a face-centered cubic (FCC) unit cell?

Accepted Answer

4

Question 15

Aluminum has a face-centered cubic unit structure and a density of 2.716 g/cm$^3$. Calculate the edge length of the unit cell.

Accepted Answer

$3.615 	imes 10^{-8}$ cm

Question 16

An element crystallizes in a face-centered cubic lattice and has a density of 18.44 g/cm$^3$. The edge of its unit cell is $1.05 	imes 10^{-8}$ cm. Calculate the atomic mass for the element.

Accepted Answer

151 g/mol

Question 17

Which of the following best describes the relationship between packing efficiency and complexity of unit cells?

Accepted Answer

As complexity increases, packing efficiency increases.

Question 18

Which of the following solids is best classified as a covalent network solid?

Accepted Answer

Graphite

Question 19

Which property is most characteristic of metallic solids?

Accepted Answer

High melting point and electrical conductivity due to delocalized electrons

Question 20

A solid is shiny, malleable, and conducts electricity. It is most likely:

Accepted Answer

A metallic solid

Crystalline Solids and Modern Materials: Structure and Properties

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