Test Bank Ch.26 S-Block Chemistry Burrows

Chapter 26: s-Block Chemistry

Test Bank

Type: multiple response question

Title: Chapter 26 Question 01

1) The properties of the Group 1 metals include? Please select all that apply.

Section reference: 26.1

a. Distinctive visible spectra

b. High melting points

c. Easy oxidation to M⁺

d. Reaction with water evolves hydrogen

Type: true-false

Title: Chapter 26 Question 02

2) The Down’s cell is used to produce sodium metal by electrolysis of molten sodium chloride. True or false?

a. True

Section reference: 26.1

b. False

Section reference: 26.1

Type: true-false

Title: Chapter 26 Question 03

3) The lattice enthalpy as determined by the Kapustinskii equation of K₂O is larger in magnitude than the lattice enthalpy of K₂O₂. True or false?

a. True

Section reference: 25.4

b. False

Section reference: 26.2

Type: multiple choice question

Title: Chapter 26 Question 04

4) In the suboxide Cs₁₁O₃ , the electrons are delocalized over the whole structure. Give a formula that more adequately represents this arrangement.

Section reference: 26.2

a. (Cs⁺)₁₁(O^–)₃(e^–)₈

b. (Cs⁺)₁₁(O)₃(e^–)₁₁

c. (Cs⁺)₆(Cs)₅(O^2–)₃

d. (Cs⁺)₁₁(O^2–)₃(e^–)₅

Type: true-false

Title: Chapter 26 Question 05

5) Sodium hydroxide is prepared industrially by electrolysis of a solution of sodium chloride. True or false?

a. True

Section reference: 26.2

b. False

Section reference: 26.2

Type: multiple response question

Title: Chapter 26 Question 06

6) The reaction of lithium with water is much slower than that of caesium, but the hydration enthalpy is higher because. Please select all that apply.

Section reference: 26.2

a. Cs reacts with water to form an insoluble oxide not a soluble hydroxide.

b. Lithium has a much larger charge to radius ratio than caesium and attracts more water molecules on hydration

c. Caesium has a much larger charge to radius ratio than lithium and attracts more water molecules on hydration

d. The heat of the reaction is enough to melt the caesium metal as it has a low melting point.

Type: multiple choice question

Title: Chapter 26 Question 07

7) Which of these enthalpy cycles correctly accounts for the formation of a metal carbonate from its ions

Section reference: 26.2, 26.3

a.

b.

c.

d.

Type: matching question

Title: Chapter 26 Question 08

8) Match the reaction products with their reactants.

Section reference: 26.2 (oxides) and 26.5 (amide) a. sodium + oxygen = sodium peroxide

b. sodium + water = sodium hydroxide plus hydrogen

c. heat + sodium peroxide = sodium oxide plus oxygen

d. sodium + ammonia = sodium amide plus hydrogen

Type: true-false

Title: Chapter 26 Question 09

9) While Group 1 metal cations generally coordinate weakly to most ligands, they do form stable complexes with size selective macrocyclic ligands. True or false?

a. True

Section reference: 26.2

b. False

Section reference: 26.2

Type: multiple response question

Title: Chapter 26 Question 10

10) The properties of beryllium are markedly different from the rest of the Group 2 elements. Why? Please select all that apply.

Section reference: 26.6, 26.7, 26.8, 26.9

a. Beryllium has a high charge ratio.

b. Beryllium shows much covalent character in its bonding.

c. Beryllium is highly unstable and no compounds have been isolated.

d. Beryllium reacts with water to produce Be(OH)₂.

Type: multiple choice question

Title: Chapter 26 Question 11

11) The concentration of hydroxide ions in a saturated solution of Ca(OH)₂ is 4.18 x 10^–3 mol dm^–3. What is the pH of this solution?

Section reference: 26.6

a. 5.6

b. 11.6

c. 12.2

d. 1.8

Type: fill-in-blank

Title: Chapter 26 Question 12

12) Beryllium hydroxide, like aluminium hydroxide, shows ____________ behaviour.

Section reference: 26.6

a. Amphoteric

Type: true-false

Title: Chapter 26 Question 13

13) Magnesium hydroxide is widely used in the indigestion remedy, milk of magnesia. Barium hydroxide would be a better antacid than magnesium hydroxide. True or false?

a. True

Section reference: 26.6

b. False

Section reference: 26.6

Type: multiple choice question

Title: Chapter 26 Question 14

14) Neither the Born Lande or the Kapustinskii equations correctly calculate the lattice energy for beryllium compounds. Why?

Section reference: 26.6

a. The Born Lande and Kapustinskii models are based on ionic bonding and the bonding in beryllium compounds is largely covalent.

b. The ionic radius of beryllium is an estimate as no beryllium compounds have been isolated.

c. Beryllium compounds do not form the usual lattice types and no value of the Madelung constant for their structures have been calculated.

d. The first ionisation potential of beryllium is not known.

Type: true-false

Title: Chapter 26 Question 15

15) The Kapustinskii equation predicts that the lattice enthalpy increases from MCl to MCl₂ to MCl₃. True or false?

a. True

Section reference: 26.6

b. False

Section reference: 26.6

Type: fill-in-blank

Title: Chapter 26 Question 16

16) Quicklime can be used in bricklaying to produce a strong mortar after a few days of hardening in air. During the hardening process Ca(OH)₂ reacts with ____ from the air.

Section reference: 26.6

a. CO₂

Type: multiple choice question

Title: Chapter 26 Question 17

17) A trainee technician is asked to prepare solutions of calcium hydroxide and barium hydroxide for a laboratory class the following week. Just as he has finished weighing out the solid samples of CaO and BaO, the fire alarm is tested and as it is the end of the day, the technician goes home. Next morning as he is trying to dissolve the BaO sample it will not dissolve in water. Why might this be?

Section reference: 26.7

a. The alkali metal oxides are insoluble in water.

b. Barium oxide is light sensitive and has decomposed to insoluble products.

c. BaO is not stable in air as in the presence of carbon dioxide, barium oxide has transformed to the insoluble barium carbonate.

d. BaO rapidly reacts with oxygen in the air to form BaO₂ which is insoluble in water.

Type: multiple choice question

Title: Chapter 26 Question 18

18) White vinegar is a cheap alternative to the many expensive limescale removers on the market. Which equation correctly describes the reaction between limescale and vinegar?

Section reference: 26.7

a. CaCO₃ (s) + 2 CH₃CO₂H (aq) → Ca(CH₃CO₂)₂ (aq) + H₂O (l) + CO₂ (g)

b. CaCO₃ (s) + 2 CO₂H₂ (aq) → Ca(HCOO)₂ (aq) + H₂O (l) + CO₂ (g)

c. CaCO₃ (s) + CH₃CO₂H (aq) → Ca(CH₂CO₂)₂ (aq) + H₂O (l) + CO₂ (g)

d. CaCO₃ (s) + CO₂H₂ (aq) → Ca(COO) (aq) + H₂O (l) + CO₂ (g)

Type: fill-in-blank

Title: Chapter 26 Question 19

19) Compounds of beryllium form _____ solutions.

Section reference: 26.7

a. Acidic

Type: multiple choice question

Title: Chapter 26 Question 20

20) The coordination chemistry of the Group 2 cations is much greater than that of the Group 1 cations. Why?

Section reference: 26.8

a. The alkaline earth metal ions have a greater charge density.

b. The alkaline earth metals form more soluble compounds.

c. The alkaline earth metals are more reactive.

d. The alkali metal ions are too small to coordinate to many ligands.

Type: fill-in-blank

Title: Chapter 26 Question 21

21) Beryllium normally has a coordination number of _ in its compounds.

Section reference: 26.8

a. 4

Type: multiple response question

Title: Chapter 26 Question 22

22) Beryllium chemistry is very different to the rest of the group. Which of the following statements apply to beryllium and not the rest of Group 2. Please select all that apply.

Section reference: 26.9

a. Beryllium hydroxide is amphoteric.

b. Beryllium oxide does not react with water to form beryllium hydroxide.

c. Beryllium forms many covalent compounds.

d. Beryllium does not form a divalent cation.

Type: multiple choice question

Title: Chapter 26 Question 23

23) Methyl lithium exists as a

Section reference: 26.10, Figure 26.13

a. Monomer

b. Trimer

c. Dimer

d. Tetramer

Type: fill-in-blank

Title: Chapter 26 Question 24

24) The compound EtMgBr is used extensively in organic chemistry as a _______ reagent.

Section reference: 26.10

a. Grignard

Type: multiple choice question

Title: Chapter 25 Question 25

25) Many metals form metallocene complexes where a metal ion is sandwiched between two aromatic rings. The ion is considered to be equally coordinated to all carbons in the ring.

For example cyclopentadience (C₅H₆) reacts with sodium to form the ionic compound (C₅H₅)^– Na⁺. The ring structure of the ligand is aromatic and the structure drawn as delocalised. This ionic salt is then used to produce a host of coordination complexes e.g with Fe, Mg, Be etc which consist of a divalent cation and two cycolpentadienyl rings. Most of these ions form a sandwich complex where the metal ion lies equidistantly between the two rings. However, in the gas phase, beryllium coordinates to one ring or the other but not both. By considering the properties of beryllium, suggest why this might be.

Section reference: 26.9

a. Beryllium is so small that it brings the two negatively charged rings too close to each other and they repel. Be can therefore only coordinate to one ring at a time.

b. The rings are too bulky and can’t get close to the beryllium as it is so small.

c. Beryllium must be neutral in this compound.

d. The orbitals of the beryllium hybridize to form four covalent bonds rather than the sandwich structure.