Question 1

The Kapustinskii equation predicts that the lattice enthalpy increases from MCl to MCl2 to MCl3.

Accepted Answer

A) True 
 B)False  True

Question 2

Match the reaction products with their reactants.
-sodium + oxygen

Accepted Answer

A)   sodium peroxide
B)   sodium hydroxide plus hydrogen
C)   sodium oxide plus oxygen
D)   sodium amide plus hydrogen A

Question 3

Sodium hydroxide is prepared industrially by electrolysis of a solution of sodium chloride.

Accepted Answer

A) True 
 B)False  True

Question 4

Magnesium hydroxide is widely used in the indigestion remedy, milk of magnesia. Barium hydroxide would be a better antacid than magnesium hydroxide.

Accepted Answer

A) True 
 B)False

Question 5

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.

Accepted Answer

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.

Question 6

The lattice enthalpy as determined by the Kapustinskii equation of K2O is larger in magnitude than the lattice enthalpy of K2O2.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

The answer of The compound EtMgBr is used extensively in...

Question 8

Match the reaction products with their reactants.
-sodium + ammonia

Accepted Answer

A)   sodium peroxide
B)   sodium hydroxide plus hydrogen
C)   sodium oxide plus oxygen
D)   sodium amide plus hydrogen

Question 9

Methyl lithium exists as a

Accepted Answer

A)   Monomer
B)   Trimer
C)   Dimer
D)   Tetramer

Question 10

Beryllium hydroxide, like aluminium hydroxide, shows ____________ behaviour.

Accepted Answer

The answer of Beryllium hydroxide, like aluminium hydroxide, shows ____________...

Question 11

Compounds of beryllium form _____ solutions.

Accepted Answer

The answer of Compounds of beryllium form _____ solutions....

Question 12

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

Accepted Answer

A)   Distinctive visible spectra
B)   High melting points
C)   Easy oxidation to M+
D)   Reaction with water evolves hydrogen

Question 13

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

Accepted Answer

A)   (Cs+) 11(O-) 3(e-) 8
B)   (Cs+) 11(O) 3(e-) 11
C)   (Cs+) 6(Cs) 5(O2-) 3
D)   (Cs+) 11(O2-) 3(e-) 5

Question 14

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

Accepted Answer

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.

Question 15

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

Accepted Answer

The answer of Beryllium normally has a coordination number of...

Question 16

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.

Accepted Answer

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.

Question 17

While Group 1 metal cations generally coordinate weakly to most ligands, they do form stable complexes with size selective macrocyclic ligands.

Accepted Answer

A) True 
 B)False

Question 18

Match the reaction products with their reactants.
-heat + sodium peroxide

Accepted Answer

A)   sodium peroxide
B)   sodium hydroxide plus hydrogen
C)   sodium oxide plus oxygen
D)   sodium amide plus hydrogen

Question 19

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

Accepted Answer

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.

Question 20

The Down's cell is used to produce sodium metal by electrolysis of molten sodium chloride.

Accepted Answer

A) True 
 B)False

Exam 26: S-Block Chemistry

The Kapustinskii equation predicts that the lattice enthalpy increases from MCl to MCl₂ to MCl₃.

Match the reaction products with their reactants. -sodium + oxygen

Sodium hydroxide is prepared industrially by electrolysis of a solution of sodium chloride.

Magnesium hydroxide is widely used in the indigestion remedy, milk of magnesia. Barium hydroxide would be a better antacid than magnesium hydroxide.

The lattice enthalpy as determined by the Kapustinskii equation of K₂O is larger in magnitude than the lattice enthalpy of K₂O₂.

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

Match the reaction products with their reactants. -sodium + ammonia

Methyl lithium exists as a

Beryllium hydroxide, like aluminium hydroxide, shows ____________ behaviour.

Compounds of beryllium form _____ solutions.

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

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

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

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

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.

While Group 1 metal cations generally coordinate weakly to most ligands, they do form stable complexes with size selective macrocyclic ligands.

Match the reaction products with their reactants. -heat + sodium peroxide

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

The Down's cell is used to produce sodium metal by electrolysis of molten sodium chloride.