Solids Exam Prep Chapter 6

Chapter 6: Solids

Test Bank

Type: multiple response question

Title: Chapter 06 Question 01

1) Which of the following statements describe properties of metallic solids? Please select all that apply.

Section reference: 6.1 , Table 6.1

a. good thermal conductivity

b. high density

c. brittle

d. good electrical conductivity

Type: fill-in-blank

Title: Chapter 06 Question 02

2) Ionic solids are held together with __________ interactions.

Section reference: 6.1

a. electrostatic

Type: matching question

Title: Chapter 06 Question 03

3) Match the material with the bonding type.

Section reference: 6.1 , Table 6.1.

a. platinum (Pt) = metallic

b. N₂O = molecular

c. S = covalent

d. SrF₂ = ionic

Type: true-false

Title: Chapter 06 Question 04

4) A crystalline solid demonstrates long-range order which persists over distances much greater than the bond length between the atoms. It is possible to predict the position of every atom from those given in the unit cell. True or false?

a. True

Section reference: 6.1

b. False

Section reference: 6.1

Type: true-false

Title: Chapter 06 Question 05

5) The structure of C₆₀ is analogous to the stitching on a European football and is shown in the diagram below. Each carbon lies on the surface of a sphere and the carbon is sp³ hybridized? True or false?

a. True

Section reference: 6.1 (and see Chapter 5 on hybridization of atomic orbitals).

b. False

Section reference: 6.1 (and see Chapter 5 on hybridization of atomic orbitals).

Type: fill-in-blank

Title: Chapter 06 Question 06

6) Silicon dioxide exists as different polymorphs e.g. quartz and cristobalite. When silicon dioxide is melted and quenched (rapidly cooled), it forms an _______ structure known as a glass.

Section reference: 6.1

a. amorphous

Type: multiple response question

Title: Chapter 06 Question 07

7) A magnetic levitation train uses the Meissner effect to propel the train along magnetic rails. Which of these facts relating to superconductors are true. Please select all that apply.

Section reference: 6.1 , Box 6.2

a. Superconductors are diamagnetic.

b. No matter the temperature, superconductors exhibit the Meissner effect.

c. Electrons move in pairs through the lattice.

d. The Meissner effect occurs at low temperature when the superconductor is below its critical temperature.

Type: true-false

Title: Chapter 06 Question 08

8) The structure with repeat sequence ABCCABCCABCCABC is close-packed. True or false?

a. True

Section reference: 6.2

b. False

Section reference: 6.2

Type: true-false

Title: Chapter 06 Question 09

9) A body centred cubic unit cell is close-packed. True or false?

a. True

Section reference: 6.2 , Figure 6.7

b. False

Section reference: 6.2 , Figure 6.7

Type: multiple choice question

Title: Chapter 06 Question 10

10) β-tungsten crystallises with a body centred cubic structure where the length of the unit cell is 3.150 Å. Use the diagram to calculate the radius of a tungsten atom. (Hint: The radius of the atom is just half the distance between the two closest atoms.)

Section reference: 6.2

a. 2.692 Å

b. 1.136 Å

c. 1.346 Å

d. 1.575 Å

Type: true-false

Title: Chapter 06 Question 11

11) A lattice point on the edge of a cubic unit cell is worth one quarter of a lattice point True or False?

a. True

Section reference: 6.2

b. False

Section reference: 6.2

Type: multiple response question

Title: Chapter 06 Question 12

12) A semiconductor has which of the following properties? Please select all that apply.

Section reference: 6.3

a. A filled conduction band.

b. A significant but small band gap.

c. A filled valence band.

d. Conductivity that falls as the temperature falls.

Type: multiple response question

Title: Chapter 06 Question 13

13) What is the formula of a compound based on cubic close packing where one quarter of the tetrahedral holes (T) are filled in a lattice made of lattice points of type A. What is the coordination number of the filled holes and the lattice points? Please select all that apply.

Section reference: 6.4

a. Formula A₂T

b. Coordination number of the lattice point would be 2 and the filled hole would be four.

c. Formula AT₂

d. Coordination number of the lattice point would be 4 and the filled hole would be four

Type: multiple choice question

Title: Chapter 06 Question 14

14) Li₂O crystallises with the antifluorite structure where the positions of the cations and anions are in the opposite positions to the structure observed for fluorite. What are the coordination numbers of the lithium and oxygen ions?

Section reference: 6.4

a. Lithium is four coordinate and oxygen is six coordinate.

b. Lithium is four coordinate and oxygen is eight coordinate.

c. Lithium is eight coordinate and oxygen is four coordinate.

d. Lithium and oxygen are both six coordinate.

Type: fill-in-blank

Title: Chapter 06 Question 15

15) Lattice point counting for sphalerite shows that the structure contains ___ Zn/S ions.

Section reference: 6.4

a. 4

Type: true-false

Title: Chapter 06 Question 16

16) The coordination number of iodine in cadmium iodide is six. True or false?

a. True

Section reference: 6.4

b. False

Section reference: 6.4

Type: true-false

Title: Chapter 06 Question 17

17) There is no structural analogue of CaF₂ in hexagonal close packing (fill all tetrahedral holes) True or False?

a. True

Section reference: 6.4

b. False

Section reference: 6.4

Type: multiple response question

Title: Chapter 06 Question 18

18) The structure of the perovskite (calcium titanate) is given below. What is the coordination number of the two cations? Please select all that apply.

Section reference: 6.4 , Figure 6.27

a. Ca is 12 coordinate

b. Ti is 12 coordinate

c. Ti is 6 coordinate

d. Ca is 6 coordinate

Type: true-false

Title: Chapter 06 Question 19

19) The ionic radius of an atom can be measured by X-ray diffraction. True or false?

a. True

Section reference: 6.5

b. False

Section reference: 6.5

Type: true-false

Title: Chapter 06 Question 20

20) Magnesium oxide crystallizes with the sodium chloride structure. Magnesium oxide obeys the radius ratio rule for this structure. True or false?

a. True

Section reference: 6.5

b. False

Section reference: 6.5

Type: multiple choice question

Title: Chapter 06 Question 21

21) Use the following data to construct a thermochemical cycle for the formation of ZnS from its elements and use the cycle to calculate the enthalpy of formation of ZnS.

Zn (s) → Zn (g) 130 kJ mol^–1

Zn (g) → Zn⁺ (g) 906 kJ mol^–1

Zn⁺ (g) → Zn²⁺ (g) 1733 kJ mol^–1

ZnS (s) → Zn²⁺ (g) + S^2– (g) 3048 kJ mol^–1

S (s) → S (g) 233 kJ mol^–1

S (s) → S^– (g) –200 kJ mol^–1

S^– (s) → S^2– (g) 456 kJ mol^–1

Section reference: 6.5

a. 200 kJ mol^–1

b. –200 kJ mol^–1

c. 33 kJ mol^–1

d. 2848 kJ mol^–1

Type: matching question

Title: Chapter 06 Question 22

22) Match the value of Born exponent with the appropriate compound. given that the Born exponent values for the individual ions are Be²⁺ = 5, F^– = 7, Zn²⁺, S^2– and Cl^– = 9, Rb⁺ = 10, Cs⁺ = 12 respectively.

Section reference: 6.6, Table 6.8

a. ZnS = 9.0

b. CsCl = 10.5

c. BeF₂ = 6.33

d. RbCl = 9.5

Type: multiple choice question

Title: Chapter 06 Question 23

23) Use the Born Lande equation to calculate the lattice energy of MgO given that r = 210.5 pm.

Section reference: 6.6

a. 7914 kJ mol^–1

b. 3957 kJ mol^–1

c. 4617 kJ mol^–1

d. 989 kJ mol^–1

Type: multiple choice question

Title: Chapter 06 Question 24

24) Use the Kapustinskii equation to estimate the lattice enthalpy for KBr given that the ionic radii are 138 and 196 pm for K⁺ and Br^– respectively.

Section reference: 6.6

a. 646 kJ mol^–1

b. 323 kJ mol^–1

c. 2584 kJ mol^–1

d. 46 kJ mol^–1

Type: true-false

Title: Chapter 06 Question 25

25) Iron and cobalt both have similar low electronegativities. The predicted structure based on this information is an alloy. True or false?

a. True

Section reference: 6.7

b. False

Section reference: 6.7