Question 1

Which of the following is the oxoanion of bromine called the bromate ion?

Accepted Answer

A)  BrO3- 
B)  BrO32- 
C)  BrO42- 
D)  BrO2- 
E)  BrO- 
A)  BrO3- 
B)  BrO32- 
C)  BrO42- 
D)  BrO2- 
E)  BrO- A

Question 2

In the early 1900s, Ernest Rutherford performed an experiment with thin foils of gold and alpha particles to probe the structure of the atoms. He observed that most of these alpha particles penetrated the foil and were not deflected. Realizing that atoms are electrically neutral (that is, they have equal numbers of protons and electrons) and that the mass of a proton is significantly greater than the mass of an electron, use Rutherford's data to propose a structural model of an atom.

Accepted Answer

(Answers will vary.) Atoms are mostly empty space. The mass is concentrated mostly at the center of the atom.

Question 3

Which of these compounds is most likely to be ionic?

Accepted Answer

A)  KF 
B)  CCl4 
C)  CS2 
D)  CO2 
E)  ICl 
A)  KF 
B)  CCl4 
C)  CS2 
D)  CO2 
E)  ICl A

Question 4

What is the formula for lead(II) oxide?

Accepted Answer

A)  PbO 
B)  PbO2 
C)  Pb2O 
D)  PbO4 
E)  Pb2O3 
A)  PbO 
B)  PbO2 
C)  Pb2O 
D)  PbO4 
E)  Pb2O3

Question 5

Which of these scientists developed the nuclear model of the atom?

Accepted Answer

A)  John Dalton 
B)  Robert Millikan 
C)  J. J. Thomson 
D)  Henry Moseley 
E)  Ernest Rutherford 
A)  John Dalton 
B)  Robert Millikan 
C)  J. J. Thomson 
D)  Henry Moseley 
E)  Ernest Rutherford

Question 6

Two isotopes of an element differ only in their

Accepted Answer

A)  symbol. 
B)  atomic number. 
C)  atomic mass. 
D)  number of protons. 
E)  number of electrons. 
A)  symbol. 
B)  atomic number. 
C)  atomic mass. 
D)  number of protons. 
E)  number of electrons.

Question 7

Which field of study made a big contribution toward understanding the composition of the atom?

Accepted Answer

A)  Electricity 
B)  Radiation 
C)  Solution chemistry 
D)  Electrochemistry 
E)  Quantum mechanics 
A)  Electricity 
B)  Radiation 
C)  Solution chemistry 
D)  Electrochemistry 
E)  Quantum mechanics

Question 8

State the two important experimental results (and the names of the responsible scientists) which enabled the mass of the electron to be determined.

Accepted Answer

Thomson measured m/e, the mass

Question 9

What is the name of PCl3?

Accepted Answer

A)  phosphorus chloride 
B)  phosphoric chloride 
C)  phosphorus trichlorate 
D)  trichlorophosphide 
E)  phosphorus trichloride 
A)  phosphorus chloride 
B)  phosphoric chloride 
C)  phosphorus trichlorate 
D)  trichlorophosphide 
E)  phosphorus trichloride

Question 10

Many different compounds might be represented by the same empirical formula.

Accepted Answer

A) True 
 B)False

Question 11

A row of the periodic table is called a(n)

Accepted Answer

A)  group. 
B)  period. 
C)  isotopic mixture. 
D)  family. 
E)  subshell. 
A)  group. 
B)  period. 
C)  isotopic mixture. 
D)  family. 
E)  subshell.

Question 12

Who is credited with first measuring the charge of the electron?

Accepted Answer

A)  Dalton 
B)  Gay-Lussac 
C)  Thomson 
D)  Millikan 
E)  Rutherford 
A)  Dalton 
B)  Gay-Lussac 
C)  Thomson 
D)  Millikan 
E)  Rutherford

Question 13

Lithium forms compounds which are used in dry cells, storage batteries, and in high-temperature lubricants. It has two naturally occurring isotopes, 6Li (isotopic mass = 6.015123 amu) and 7Li (isotopic mass = 7.016005 amu). Lithium has an atomic mass of 6.9412 amu. What is the percent abundance of lithium-6?

Accepted Answer

A)  92.53% 
B)  86.65% 
C)  49.47% 
D)  7.47% 
E)  6.015% 
A)  92.53% 
B)  86.65% 
C)  49.47% 
D)  7.47% 
E)  6.015%

Question 14

What element is represented by X in the atomic symbol notation   ?

Accepted Answer

A)  Iridium 
B)  Platinum 
C)  Palladium 
D)  Selenium 
E)  Magnesium 
A)  Iridium 
B)  Platinum 
C)  Palladium 
D)  Selenium 
E)  Magnesium

Question 15

Ionic compounds may carry a net positive or net negative charge.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is a type of radioactive radiation that consists of positively charged particles and is deflected away from the positively charged plate?

Accepted Answer

A)  α rays 
B)  β rays 
C)  γ rays 
D)  δ rays 
E)  ε rays 
A)  α rays 
B)  β rays 
C)  γ rays 
D)  δ rays 
E)  ε rays

Question 17

What name is given to the simplest organic compounds which only contain carbons and hydrogens?

Accepted Answer

The answer of What name is given to the simplest...

Question 18

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon.

Accepted Answer

A)  29.2252 amu 
B)  28.9757 amu 
C)  28.7260 amu 
D)  28.0855 amu 
E)  27.9801 amu 
A)  29.2252 amu 
B)  28.9757 amu 
C)  28.7260 amu 
D)  28.0855 amu 
E)  27.9801 amu

Question 19

What is the name of ClO - ion?

Accepted Answer

A)  hypochlorite 
B)  chlorate 
C)  chlorite 
D)  perchlorate 
E)  perchlorite 
A)  hypochlorite 
B)  chlorate 
C)  chlorite 
D)  perchlorate 
E)  perchlorite

Question 20

Why was it more difficult to design an experiment that would prove the existence of neutrons than it was to design an experiment that would prove the existence of either protons or electrons?

Accepted Answer

A)  Neutrons are smaller than either protons or electrons, so their presence is much more difficult to detect. 
B)  Because neutrons are 1840 times heavier than protons, they are difficult to separate, and therefore, to count. 
C)  Neutrons do not deflect charged particles. 
D)  The similarity of the magnetic and electrical properties of protons and neutrons made them experimentally indistinguishable. 
A)  Neutrons are smaller than either protons or electrons, so their presence is much more difficult to detect. 
B)  Because neutrons are 1840 times heavier than protons, they are difficult to separate, and therefore, to count. 
C)  Neutrons do not deflect charged particles. 
D)  The similarity of the magnetic and electrical properties of protons and neutrons made them experimentally indistinguishable.

Exam 2: Atoms, Molecules, and Ions

Which of the following is the oxoanion of bromine called the bromate ion?

Which of these compounds is most likely to be ionic?

What is the formula for lead(II) oxide?

Which of these scientists developed the nuclear model of the atom?

Two isotopes of an element differ only in their

Which field of study made a big contribution toward understanding the composition of the atom?

State the two important experimental results (and the names of the responsible scientists) which enabled the mass of the electron to be determined.

What is the name of PCl3?

Many different compounds might be represented by the same empirical formula.

A row of the periodic table is called a(n)

Who is credited with first measuring the charge of the electron?

What element is represented by X in the atomic symbol notation ?

Ionic compounds may carry a net positive or net negative charge.

Which of the following is a type of radioactive radiation that consists of positively charged particles and is deflected away from the positively charged plate?

What name is given to the simplest organic compounds which only contain carbons and hydrogens?

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon.

What is the name of ClO - ion?

Why was it more difficult to design an experiment that would prove the existence of neutrons than it was to design an experiment that would prove the existence of either protons or electrons?

Chemistry: the Central Science

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

Organic Chemistry

Filters

What is the name of PCl₃?

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, ²⁸Si, ²⁹Si, and ³⁰Si. Calculate the atomic mass of silicon.

What is the name of ClO^- ion?