Chapter 25 Exam Prep Hydrogen Burrows

Chapter 25: Hydrogen

Test Bank

Type: true-false

Title: Chapter 25 Question 01

1) The presence of hydrogen was first detected when a flammable gas was released after dissolution of iron filings in hydrochloric acid. True or false?

a. True

Section reference: 25.1

b. False

Section reference: 25.1

Type: true-false

Title: Chapter 25 Question 02

2) Despite often being placed at the top of the group 1 elements, hydrogen does not fit this classification well despite the ns¹ ground state configuration. True or false?

a. True

Section reference: 25.1

b. False

Section reference: 25.1

Type: multiple response question

Title: Chapter 25 Question 03

3) Which of the following statements apply to hydrogen? Please select all that apply.

Section reference: 25.1

a. Elemental hydrogen exists as a dimer with the lowest density of all the gases.

b. H₂ is generally unreactive unless in the presence of a catalyst.

c. Occurs naturally on Earth.

d. While the bond enthalpy of H₂ is high, the intermolecular forces between hydrogen molecules are weak.

Type: fill-in-the blank

Title: Chapter 25 Question 04

4) Hydrogen gas has the lowest ______ of any gas

Section reference: 25.1

a. Density

Type: true-false

Title: Chapter 25 Question 05

5) Producing hydrogen for use in fuel cells is attracting interest in the search for alternatives to fossil fuels, due to concerns about global warming. Using hydrogen produced via the steam reforming process in fuel cells would not entirely alleviate the problem. True or false?

a. True

Section reference: 25.1

b. False

Section reference: 25.1, 25.2

Type: true-false

Title: Chapter 25 Question 06

6) If hydrogen forms a compound with an element that is more electropositive than itself it is known as protic. True or false?

a. True

Section reference: 25.1, 25.2

b. False

Section reference: 25.1, 25.2

Type: matching question

Title: Chapter 25 Question 07

7) The Periodic Table of the elements forms four different types of hydride. Match the type of hydride with the appropriate compound.

Section reference: 25.2, Figure 25.1

a. AsH₃ = Electron-rich hydride

b. B₂H₆ = Electron-deficient hydride

c. KH = Ionic hydride

d. CH₄ = Electron-precise hydride

Type: fill-in-the blank

Title: Chapter 25 Question 08

8) LiH and MgH₂ show similarities in their bonding, this is an illustration of the ____________ relationship.

Section reference: 25.2

a. Diagonal

Type: multiple choice question

Title: Chapter 25 Question 09

9) Cerium hydride has a structure based on the fluorite structure where cooperative reorganisation of the anion sublattice allows extra hydrogen to be incorporated inside the structure such that x = 0.25. On strong heating all the hydrogen can be liberated from the structure. What percentage of its own mass in hydrogen can Ce absorb within the structure when x =0.25. RAM (g mol^–1) of Ce = 140.12, H = 1.01.

Section reference: 25.2, Box 25.3

a. 1.58%

b. 1.62%

c. 2.18%

d. 2.21%

Type: true-false

Title: Chapter 25 Question 10

8) Diborane reacts with compounds of the formula NR₃ where R = H and Me to form an adduct. The adduct where R = Me is more stable. True or false?

a. True

Section reference: 25.1

b. False

Section reference: 25.1

Type: fill-in-the blank

Title: Chapter 25 Question 11

11) BH₄^- is using in organic chemistry as a _______ agent where it is a source of H^- ions

Section reference: 25.2

a. reducing

Type: true-false

Title: Chapter 25 Question 12

12) As Group 14 is descended, the hydrides become less stable. True or false?

a. True

Section reference: 25.2

b. False

Section reference: 25.2

Type: multiple choice question

Title: Chapter 25 Question 13

13) In contrast to NH₃, the rest of the Group 15, MH₃ compounds, show relatively poor Lewis base character. Why is this?

Section reference: 25.2

a. There are fewer valence electrons available.

b. For the rest of the Group 15 hydrides, the orbitals are not properly hybridized and the lone pair is not readily available for bonding.

c. The centres are sterically hindered due to short bond lengths and it is difficult to coordinate to the lone pair.

d. The hydrides are ionic.

Type: true-false

Title: Chapter 25 Question 14

14) Phosphine cannot be synthesized directly from phosphorus and hydrogen. True or false?

a. True

Section reference: 25.2

b. False

Section reference: 25.2

Type: true-false

Title: Chapter 25 Question 15

02) Liquid ammonia can undergo self-ionisation to form NH₂^- and NH₄⁺ True or false?

a. True

Section reference: 25.2

b. False

Section reference: 25.2

Type: multiple response question

Title: Chapter 25 Question 16

16) Which of these statements apply to H₂S? Please select all that apply.

Section reference: 25.2

a. Heat of formation is endothermic.

b. Humans recognise the characterise smell of hydrogen sulfide at concentrations less than 1 ppm.

c. At lethal concentrations, the human olfactory nerve can be paralysed, making H₂S particularly dangerous.

d. H₂S is a gas at room temperature.

Type: multiple choice question

Title: Chapter 25 Question 17

17) H₂O₂ is an hydride of oxygen, what is the oxidation state of the oxygen?.

Section reference: 25.2

a. –2

b. 0

c. –1

d. +1

Type: fill-in-blank

Title: Chapter 25 Question 18

18) Heating H₂O₂ in air causes a _____________ reaction where the oxygen is reduced and oxidised simultaneously to O₂ (oxidation state 0) and H₂O (oxidation state -2)

Section reference: 25.2

a. disproportionation

Type: matching question

Title: Chapter 25 Question 19

19) Match the enthalpy of formation with the appropriate Group 17 hydrogen halide

Section reference: 25.2, Table 25.6

a. +26.5 kJ mol^–1 = HI

b. –92.3 kJ mol^–1 = HCl

c. –271.1 kJ mol^–1 = HF

d. –36.4 kJ mol^–1 = HBr

Type: true-false

Title: Chapter 25 Question 20

20) The acidity of the hydrogen halides decrease as the bonds become less polar. True or false?

a. True

Section reference: 25.2

b. False

Section reference: 25.2

Type: true-false

Title: Chapter 25 Question 21

21) HF is a strong acid. True or false?

a. True

Section reference: 25.2

b

False

Section reference: 25.2

Type: multiple response question

Title: Chapter 25 Question 22

22) Which of the following species could be hydrogen bond acceptors? Please select all that apply

Section reference: 25.2, 25.3, 25.4

a. N

b. Cl

c. Fe

d. O

Type: multiple response question

Title: Chapter 25 Question 23

23) Which of the following points suggests that the first hydride in Groups 14–17 exhibit hydrogen bonding. Please select all that apply.

Section reference: 25.3

a. There is a steady increase in the boiling point of the hydrides from the second row onwards but the boiling point of the hydride for the first element in any group is anomalously high.

b. There is a steady increase in the melting point of the hydrides from the second row onwards but the boiling point of the hydride for the first element in any group is anomalously high.

c. There is a steady decrease in the boiling point of the hydrides from the second row onwards but the boiling point of the hydride for the first element in any group is anomalously high.

d. There is a steady decrease in the melting point of the hydrides from the second row onwards but the boiling point of the hydride for the first element in any group is anomalously high.

Type: multiple response question

Title: Chapter 25 Question 24

24) Which of the following statements about the solid structure of ice are true. Please select all that apply.

Section reference: 25.3, Figure 25.16

a. Once the hydrogen-bonded framework has broken down the density falls steadily as the temperature rises.

b. The solid structure of ice is less dense than water.

c. As the solid ice network starts to break down and molecules tumble into the holes in the framework, the density is higher at 4 °C than either the solid ice network at 0 °C or liquid water at 30 °C.

d. The solid structure of ice is more dense than water.

Type: true-false

Title: Chapter 25 Question 25

25) The C–H bond of an alkane has an IR absorption for C–H at 2930 cm^–1, the analogous C–D absorption would be observed at 2344 cm^–1. True or false?

a. True

Section reference: 25.4

b. False

Section reference: 25.4