Question 1

Explain why a human should not drink D2O.

Accepted Answer

Deuterium is heavier than hydrogen and deuterium compounds react slower than lighter isotopes. There is a slower rate of transfer of deuterium as compared to hydrogen in acid-base reactions involved in enzyme catalysis. This slow transfer rate will cause death to humans.

Question 2

The strongest elemental oxidizing agents are found in the ________ ________ region of the periodic table while the strongest reducing agents are found in the ________ ________ region of the periodic table.

Accepted Answer

A)  upper left, lower right 
B)  upper right, lower left 
C)  lower left, upper right 
D)  lower right, upper left 
E)  transition element, main group 
A)  upper left, lower right 
B)  upper right, lower left 
C)  lower left, upper right 
D)  lower right, upper left 
E)  transition element, main group B

Question 3

Which of these substances will have a Lewis structure with an incomplete octet?

Accepted Answer

A)  SO2 
B)  CO 
C)  NO 
D)  Br2 
E)  CO2 
A)  SO2 
B)  CO 
C)  NO 
D)  Br2 
E)  CO2 C

Question 4

Identify by number (1A-8A) the main group of the periodic table to which the described element (X) belongs, in each of the following cases.
a. X commonly forms the ion X2-.
b. X reacts with water according to the equation
X(s) + 2H2O(l) → X(OH)2(aq) + H2(g)
c. X exists as molecules, X2; its hydride has the formula HX.
d. X is a metal which reacts with oxygen to produce the peroxide, X2O2.

Accepted Answer

a. 6A (16)

Question 5

Hydrogen is placed at the top of Group 1A of the periodic table, so it must be a metal.

Accepted Answer

A) True 
 B)False

Question 6

Which oxide is an amphoteric oxide?

Accepted Answer

A)  Na2O 
B)  Al2O3 
C)  BaO 
D)  SiO2 
E)  More that one of these oxides is amphoteric. 
A)  Na2O 
B)  Al2O3 
C)  BaO 
D)  SiO2 
E)  More that one of these oxides is amphoteric.

Question 7

What is the formal charge on the oxygen atom in N2O (the atomic order is N-N-O) with a triple bond between the two N atoms and a single bond between N and O?

Accepted Answer

A)  -2 
B)  +2 
C)  0 
D)  -1 
E)  +1 
A)  -2 
B)  +2 
C)  0 
D)  -1 
E)  +1

Question 8

What process involves the addition of a hydrogen molecule to compounds containing multiple bonds?

Accepted Answer

A)  Hydration 
B)  Alkanation 
C)  Hydrogenation 
D)  Esterification 
E)  Coagulation 
A)  Hydration 
B)  Alkanation 
C)  Hydrogenation 
D)  Esterification 
E)  Coagulation

Question 9

What are the products of the reaction of strontium hydride and water?SrH2(s) + H2O(l) →

Accepted Answer

A)  Sr2+(aq) + H2(g) + O2(g) 
B)  Sr2+(aq) + H2(g) + OH-(aq) 
C)  Sr(s) + H2(g) + OH-(aq) 
D)  Sr(s) + H3O+(aq) 
E)  Sr2+(aq) + H-(aq) 
A)  Sr2+(aq) + H2(g) + O2(g) 
B)  Sr2+(aq) + H2(g) + OH-(aq) 
C)  Sr(s) + H2(g) + OH-(aq) 
D)  Sr(s) + H3O+(aq) 
E)  Sr2+(aq) + H-(aq)

Question 10

In a certain science fiction movie, one of the main characters describes an alien planet that has an atmosphere composed of carbon monoxide and fluorine gases. Could such an atmosphere really exist?

Accepted Answer

A)  Yes. 
B)  No, because fluorine would oxidize carbon monoxide to carbon dioxide. 
C)  No, because fluorine would reduce carbon monoxide to methane. 
D)  No, because carbon monoxide would oxidize fluorine to oxygen difluoride. 
E)  No, because carbon monoxide would reduce fluorine to hydrogen fluoride. 
A)  Yes. 
B)  No, because fluorine would oxidize carbon monoxide to carbon dioxide. 
C)  No, because fluorine would reduce carbon monoxide to methane. 
D)  No, because carbon monoxide would oxidize fluorine to oxygen difluoride. 
E)  No, because carbon monoxide would reduce fluorine to hydrogen fluoride.

Question 11

How many lone electron pairs are in the N2 molecule?

Accepted Answer

A)  1 
B)  4 
C)  3 
D)  5 
E)  2 
A)  1 
B)  4 
C)  3 
D)  5 
E)  2

Question 12

What is formed when molecular hydrogen combines with any alkali metal?

Accepted Answer

The answer of What is formed when molecular hydrogen combines...

Question 13

Which of the following elements is essential to life because it is a component of proteins and nucleic acids?

Accepted Answer

A)  Phosphorus 
B)  Sulfur 
C)  Chlorine 
D)  Bromine 
E)  Nitrogen 
A)  Phosphorus 
B)  Sulfur 
C)  Chlorine 
D)  Bromine 
E)  Nitrogen

Question 14

Which of the following elements can be oxidized by nitric acid to form its corresponding oxoacid?

Accepted Answer

A)  Sulfur 
B)  Gold 
C)  Phosphorus 
D)  Both Sulphur and Phosphorus 
E)  Both Sulphur and Gold 
A)  Sulfur 
B)  Gold 
C)  Phosphorus 
D)  Both Sulphur and Phosphorus 
E)  Both Sulphur and Gold

Question 15

What is the general electron configuration for atoms of all elements in Group 5A?

Accepted Answer

A)  ns2np1 
B)  ns2np6 
C)  ns2np5 
D)  ns2np3 
E)  ns2np4 
A)  ns2np1 
B)  ns2np6 
C)  ns2np5 
D)  ns2np3 
E)  ns2np4

Question 16

Name the three different classes (types) of hydride, and list some of their important characteristics.

Accepted Answer

Ionic hydrides form with metals from Gro

Question 17

The chemical that ranks first in production among all industrial chemicals is

Accepted Answer

A)  NH3, ammonia. 
B)  H3PO4, phosphoric acid. 
C)  NaOH, sodium hydroxide. 
D)  Na2CO3, sodium carbonate. 
E)  H2SO4, sulfuric acid. 
A)  NH3, ammonia. 
B)  H3PO4, phosphoric acid. 
C)  NaOH, sodium hydroxide. 
D)  Na2CO3, sodium carbonate. 
E)  H2SO4, sulfuric acid.

Question 18

The presence of ozone in the upper atmosphere is important because

Accepted Answer

A)  O3 absorbs outgoing radiation from the earth's surface, thus helping to keep the earth warm. 
B)  O3 absorbs harmful solar radiation. 
C)  O3 dissolves in water droplets and is very reactive. 
D)  O3 is a major reactant in photosynthesis. 
A)  O3 absorbs outgoing radiation from the earth's surface, thus helping to keep the earth warm. 
B)  O3 absorbs harmful solar radiation. 
C)  O3 dissolves in water droplets and is very reactive. 
D)  O3 is a major reactant in photosynthesis.

Question 19

Which of these elements occupies a position on the periodic table that is not entirely consistent with its chemical properties?

Accepted Answer

A)  H 
B)  He 
C)  Ar 
D)  Al 
E)  U 
A)  H 
B)  He 
C)  Ar 
D)  Al 
E)  U

Question 20

Which of the following is an accurate comparison of the properties of nitrogen and oxygen?

Accepted Answer

A)  Both oxygen and nitrogen form anions easily. 
B)  Oxygen is a strong oxidizing agent while nitrogen is a strong reducing agent. 
C)  Nitrogen uses more oxidation states in its compounds than oxygen does. 
D)  Nitrogen is more reactive than oxygen. 
E)  Nitrogen does not form naturally occurring compounds, but oxygen does. 
A)  Both oxygen and nitrogen form anions easily. 
B)  Oxygen is a strong oxidizing agent while nitrogen is a strong reducing agent. 
C)  Nitrogen uses more oxidation states in its compounds than oxygen does. 
D)  Nitrogen is more reactive than oxygen. 
E)  Nitrogen does not form naturally occurring compounds, but oxygen does.

Exam 25: Organic Chemistry

Explain why a human should not drink D2O.

The strongest elemental oxidizing agents are found in the ________ ________ region of the periodic table while the strongest reducing agents are found in the ________ ________ region of the periodic table.

Which of these substances will have a Lewis structure with an incomplete octet?

Hydrogen is placed at the top of Group 1A of the periodic table, so it must be a metal.

Which oxide is an amphoteric oxide?

What is the formal charge on the oxygen atom in N2O (the atomic order is N-N-O) with a triple bond between the two N atoms and a single bond between N and O?

What process involves the addition of a hydrogen molecule to compounds containing multiple bonds?

What are the products of the reaction of strontium hydride and water?SrH2(s) + H2O(l) →

In a certain science fiction movie, one of the main characters describes an alien planet that has an atmosphere composed of carbon monoxide and fluorine gases. Could such an atmosphere really exist?

How many lone electron pairs are in the N2 molecule?

What is formed when molecular hydrogen combines with any alkali metal?

Which of the following elements is essential to life because it is a component of proteins and nucleic acids?

Which of the following elements can be oxidized by nitric acid to form its corresponding oxoacid?

What is the general electron configuration for atoms of all elements in Group 5A?

Name the three different classes (types) of hydride, and list some of their important characteristics.

The chemical that ranks first in production among all industrial chemicals is

The presence of ozone in the upper atmosphere is important because

Which of these elements occupies a position on the periodic table that is not entirely consistent with its chemical properties?

Which of the following is an accurate comparison of the properties of nitrogen and oxygen?

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Filters

Explain why a human should not drink D₂O.

The strongest elemental oxidizing agents are found in the region of the periodic table while the strongest reducing agents are found in the region of the periodic table.

What is the formal charge on the oxygen atom in N₂O (the atomic order is N-N-O) with a triple bond between the two N atoms and a single bond between N and O?

What are the products of the reaction of strontium hydride and water?SrH₂(s) + H₂O(l) →

How many lone electron pairs are in the N₂ molecule?