Question 1

Which technique is most commonly used to determine the structure of crystalline solids?

Accepted Answer

X-ray diffraction crystallography

Question 2

What is the formula for Bragg's Law, which relates the wavelength of X-rays to the distance between atomic planes in a crystal?

Accepted Answer

$$n\lambda = 2d\sin	heta$$

Question 3

A crystal produces a maximum reflection at $$	heta = 30^\circ$$ with $$\lambda = 150 pm $$and $$n = 1. $$What is the distance $$d$$ between layers?

Accepted Answer

$$d = \frac{150}{2\sin(30^\circ)} = 75 pm$$

Question 4

Which statement best describes the arrangement of particles in a crystalline solid?

Accepted Answer

Particles are arranged in an orderly geometric structure called a crystal lattice.

Question 5

What is the coordination number of a body-centered cubic (BCC) unit cell?

Accepted Answer

8

Question 6

Which type of crystalline solid is held together by metallic bonds?

Accepted Answer

Metallic atomic solid

Question 7

Which property is characteristic of network covalent atomic solids such as diamond?

Accepted Answer

Very high melting point

Question 8

What is the packing efficiency of a face-centered cubic (FCC) unit cell?

Accepted Answer

74%

Question 9

Which type of solid is most likely to be a good electrical conductor at room temperature?

Accepted Answer

Metallic atomic solid

Question 10

Which statement about graphite is correct?

Accepted Answer

It is a good electrical conductor parallel to its sheets.

Question 11

What is the main difference between a molecular solid and an ionic solid?

Accepted Answer

Molecular solids are composed of molecules held by intermolecular forces, while ionic solids are composed of ions held by electrostatic attractions.

Question 12

Which type of atomic solid is formed by noble gases?

Accepted Answer

Nonbonding atomic solid

Question 13

Which of the following is a property of buckminsterfullerene (C$$_{60}$$)?

Accepted Answer

It is somewhat soluble in nonpolar solvents.

Question 14

Which structure is described as a two-dimensional network of carbon atoms with trigonal-planar geometry?

Accepted Answer

Graphite

Question 15

Which type of solid is most likely to have a slippery feel and be used as a lubricant?

Accepted Answer

Graphite

Question 16

Which of the following best describes the difference between constructive and destructive interference in X-ray diffraction?

Accepted Answer

Constructive interference adds to the wave's amplitude, while destructive interference subtracts from it.

Question 17

Which of the following is true about the unit cell in a crystalline solid?

Accepted Answer

It is the smallest unit that shows the pattern of arrangement for all the particles.

Question 18

Which type of solid is most likely to have a very low melting point and be held together by dispersion forces?

Accepted Answer

Nonbonding atomic solid

Question 19

Which property is NOT typical of ceramics?

Accepted Answer

High electrical conductivity

Question 20

Which of the following statements about polymers is correct?

Accepted Answer

Polymers are made by linking together small molecules called monomers.

Crystalline Solids and Modern Materials: Structure, Classification, and Properties

Study Guide - Practice Questions