Question 1

Lithium differs from other members of the group 1 (1A) elements in which way?

Accepted Answer

A)  It does not react with water under any conditions. 
B)  It forms a nitride. 
C)  Its hydroxide is very soluble. 
D)  It is a rather soft metal 
E)  It is a good reducing agent 
A)  It does not react with water under any conditions. 
B)  It forms a nitride. 
C)  Its hydroxide is very soluble. 
D)  It is a rather soft metal 
E)  It is a good reducing agent

Question 2

Predict the shape of cyanogen, (CN)2.

Accepted Answer

A)  linear 
B)  bent 
C)  tetrahedral 
D)  trigonal pyramidal 
A)  linear 
B)  bent 
C)  tetrahedral 
D)  trigonal pyramidal

Question 3

Which hydroxide is significantly more soluble in 0.10 M NaOH than in pure water?

Accepted Answer

A)  Mg(OH)2 
B)  Be(OH)2 
C)  NaOH 
D)  Ca(OH)2 
E)  CsOH 
A)  Mg(OH)2 
B)  Be(OH)2 
C)  NaOH 
D)  Ca(OH)2 
E)  CsOH

Question 4

In the stepwise preparation of pure calcium carbonate from limestone, the step referred to as calcination involves:

Accepted Answer

A)  thermal decomposition of calcium carbonate to calcium oxide 
B)  addition of water to calcium oxide to form calcium hydroxide 
C)  bubbling carbon dioxide through aqueous calcium hydroxide 
D)  heating calcium oxide with carbon to form calcium metal 
E)  melting of calcium oxide 
A)  thermal decomposition of calcium carbonate to calcium oxide 
B)  addition of water to calcium oxide to form calcium hydroxide 
C)  bubbling carbon dioxide through aqueous calcium hydroxide 
D)  heating calcium oxide with carbon to form calcium metal 
E)  melting of calcium oxide

Question 5

What mass of borax [Na2B4O7(H2O)10] could be prepared from 25 kg of colemanite ore [Ca2B6O11(H2O)5] by a process that is 95% efficient, assuming that no other boron-containing product is formed?

Accepted Answer

A)  47 kg 
B)  42 kg 
C)  33 kg 
D)  31 kg 
E)  20 kg 
A)  47 kg 
B)  42 kg 
C)  33 kg 
D)  31 kg 
E)  20 kg

Question 6

Write the general reaction for a group 1 (1A) metal with water.

Accepted Answer

A)  2 M(s) + 2 H2O(l) → H2O2(aq) + 2 MH(s) 
B)  2 M(s) + 2 H2O(l) → 2 MOH(aq) + H2(g) 
C)  M(s) + H2O(l) → MO(s) + H2(g) 
D)  2 M(s) + H2O(l) → M2O(s) + H2(g) 
E)  2 M(s) + 2H2O(l) → M(OH)2(s) + H2(g) 
A)  2 M(s) + 2 H2O(l) → H2O2(aq) + 2 MH(s) 
B)  2 M(s) + 2 H2O(l) → 2 MOH(aq) + H2(g) 
C)  M(s) + H2O(l) → MO(s) + H2(g) 
D)  2 M(s) + H2O(l) → M2O(s) + H2(g) 
E)  2 M(s) + 2H2O(l) → M(OH)2(s) + H2(g)

Question 7

Graphite and diamond are:

Accepted Answer

A)  allotropes 
B)  amorphous substances 
C)  bivalent 
D)  elastomers 
E)  very unstable 
A)  allotropes 
B)  amorphous substances 
C)  bivalent 
D)  elastomers 
E)  very unstable

Question 8

How much tin is required to make a pewter dish if the dish is 85% Sn and weighs 185 g?

Accepted Answer

A)  157 g 
B)  218 g 
C)  185 g 
D)  1.59 g 
E)  27.8 g 
A)  157 g 
B)  218 g 
C)  185 g 
D)  1.59 g 
E)  27.8 g

Question 9

In the production of magnesium metal by the Dow process, the other immediate product of the electrolysis of the molten magnesium chloride is:

Accepted Answer

A)  H2(g) 
B)  HCl(g) 
C)  Cl2(g) 
D)  MgO(s) 
E)  Mg(OH)2(s) 
A)  H2(g) 
B)  HCl(g) 
C)  Cl2(g) 
D)  MgO(s) 
E)  Mg(OH)2(s)

Question 10

Both gypsum and plaster of Paris contain the same compound, but in different stages of hydration. That compound is:

Accepted Answer

A)  BaSO4 
B)  BaCO3 
C)  CaSO4 
D)  CaCO3 
E)  KAl(SO4)2 
A)  BaSO4 
B)  BaCO3 
C)  CaSO4 
D)  CaCO3 
E)  KAl(SO4)2

Question 11

Choose the INCORRECT statement about carbon.

Accepted Answer

A)  In addition to diamonds and graphite, fullerenes and nanotubes are allotropes 
B)  The finely divided soot from an incomplete combustion of natural gas is called carbon black 
C)  Coke is the result of heating coal in the absence of air 
D)  Charcoal is the result of heating wood in the absence of air 
E)  Diamond is an excellent conductor 
A)  In addition to diamonds and graphite, fullerenes and nanotubes are allotropes 
B)  The finely divided soot from an incomplete combustion of natural gas is called carbon black 
C)  Coke is the result of heating coal in the absence of air 
D)  Charcoal is the result of heating wood in the absence of air 
E)  Diamond is an excellent conductor

Question 12

For which of the following elements would be wrong to call the oxide "amphoteric"?

Accepted Answer

A)  Tl. 
B)  Al. 
C)  Be. 
D)  Ga. 
A)  Tl. 
B)  Al. 
C)  Be. 
D)  Ga.

Question 13

A sample of water has hardness expressed as 185 ppm Ca2+. The sample is passed through an ion exchange column and the Ca2+ ions are replaced by Na+ ions. What is the [Na+] in ppm of the water after it has been treated? (1 ppm = 1 g solute/106 g solution)

Accepted Answer

A)  104 
B)  212 
C)  370 
D)  92.5 
E)  52.0 
A)  104 
B)  212 
C)  370 
D)  92.5 
E)  52.0

Question 14

Choose the INCORRECT statement about silicon.

Accepted Answer

A)  Silicon forms on stable oxide. 
B)  Silicon exhibits more catenation than carbon. 
C)  Sand and quartz are SiO2. 
D)  The central feature of silicates is the SiO44- tetrahedron. 
E)  A silicone is a compound with an alternating silicon and oxygen chain as a backbone with carbon containing groups as sidechains. 
A)  Silicon forms on stable oxide. 
B)  Silicon exhibits more catenation than carbon. 
C)  Sand and quartz are SiO2. 
D)  The central feature of silicates is the SiO44- tetrahedron. 
E)  A silicone is a compound with an alternating silicon and oxygen chain as a backbone with carbon containing groups as sidechains.

Question 15

Choose the INCORRECT statement.

Accepted Answer

A)  The thermite reaction is: Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(l). 
B)  Aluminum's chief ore is bauxite. 
C)  Al2O3 is an amphoteric oxide. 
D)  Cryolite is Na3AlF6. 
E)  Alumina is Al(OH)3. 
A)  The thermite reaction is: Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(l). 
B)  Aluminum's chief ore is bauxite. 
C)  Al2O3 is an amphoteric oxide. 
D)  Cryolite is Na3AlF6. 
E)  Alumina is Al(OH)3.

Question 16

One of the most important commercial processes for the semiconductor industry in recent years has been the gas phase reaction between arsine and trimethylgallium to form the solid product:

Accepted Answer

A)  trimethylarsine 
B)  methyl hydride 
C)  gallium hydride 
D)  gallium arsenide 
E)  superconductine 
A)  trimethylarsine 
B)  methyl hydride 
C)  gallium hydride 
D)  gallium arsenide 
E)  superconductine

Exam 21: Main Group Elements I: Groups 1, 2, 13, and 14

Lithium differs from other members of the group 1 (1A) elements in which way?

Predict the shape of cyanogen, (CN)2.

Which hydroxide is significantly more soluble in 0.10 M NaOH than in pure water?

In the stepwise preparation of pure calcium carbonate from limestone, the step referred to as calcination involves:

What mass of borax [Na2B4O7(H2O)10] could be prepared from 25 kg of colemanite ore [Ca2B6O11(H2O)5] by a process that is 95% efficient, assuming that no other boron-containing product is formed?

Write the general reaction for a group 1 (1A) metal with water.

Graphite and diamond are:

How much tin is required to make a pewter dish if the dish is 85% Sn and weighs 185 g?

In the production of magnesium metal by the Dow process, the other immediate product of the electrolysis of the molten magnesium chloride is:

Both gypsum and plaster of Paris contain the same compound, but in different stages of hydration. That compound is:

Choose the INCORRECT statement about carbon.

For which of the following elements would be wrong to call the oxide "amphoteric"?

A sample of water has hardness expressed as 185 ppm Ca2+. The sample is passed through an ion exchange column and the Ca2+ ions are replaced by Na+ ions. What is the [Na+] in ppm of the water after it has been treated? (1 ppm = 1 g solute/106 g solution)

Choose the INCORRECT statement about silicon.

Choose the INCORRECT statement.

One of the most important commercial processes for the semiconductor industry in recent years has been the gas phase reaction between arsine and trimethylgallium to form the solid product:

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

Predict the shape of cyanogen, (CN)².

What mass of borax [Na₂B₄O₇(H₂O)₁₀] could be prepared from 25 kg of colemanite ore [Ca₂B₆O₁₁(H₂O)₅] by a process that is 95% efficient, assuming that no other boron-containing product is formed?

A sample of water has hardness expressed as 185 ppm Ca²⁺. The sample is passed through an ion exchange column and the Ca²⁺ ions are replaced by Na⁺ ions. What is the [Na⁺] in ppm of the water after it has been treated? (1 ppm = 1 g solute/106 g solution)