Question 1

Sodium peroxide is an oxidizer used to bleach animal and vegetable fibers. What is its formula?

Accepted Answer

A)  NaO 
B)  NaO2 
C)  Na2O2 
D)  Na2O 
E)  NaH2O2 
A)  NaO 
B)  NaO2 
C)  Na2O2 
D)  Na2O 
E)  NaH2O2

Question 2

Barium fluoride is used in embalming and in glass manufacturing. Which of the following gives the formula and bonding for barium fluoride?

Accepted Answer

A)  BaF2, ionic compound 
B)  BaF2, covalent compound 
C)  BaF, ionic compound 
D)  BaF, covalent compound 
E)  Ba2F, ionic compound 
A)  BaF2, ionic compound 
B)  BaF2, covalent compound 
C)  BaF, ionic compound 
D)  BaF, covalent compound 
E)  Ba2F, ionic compound

Question 3

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 4

Which one of the following formulas of ionic compounds is the least likely to be correct?

Accepted Answer

A)  CaCl2 
B)  NaSO4 
C)  MgCO3 
D)  KF 
E)  Cu(NO3)2 
A)  CaCl2 
B)  NaSO4 
C)  MgCO3 
D)  KF 
E)  Cu(NO3)2

Question 5

The colorless substance, MgF2, is used in the ceramics and glass industry. What is its name?

Accepted Answer

A)  magnesium difluoride 
B)  magnesium fluoride 
C)  magnesium(II) fluoride 
D)  monomagnesium difluoride 
E)  None of these choices are correct 
A)  magnesium difluoride 
B)  magnesium fluoride 
C)  magnesium(II) fluoride 
D)  monomagnesium difluoride 
E)  None of these choices are correct

Question 6

Bromine has two naturally-occurring isotopes. 79Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

Accepted Answer

A)  77.9 amu 
B)  80.0 amu 
C)  80.1 amu 
D)  80.9 amu 
E)  88.9 amu 
A)  77.9 amu 
B)  80.0 amu 
C)  80.1 amu 
D)  80.9 amu 
E)  88.9 amu

Question 7

A column of the periodic table is called a

Accepted Answer

A)  group. 
B)  period. 
C)  isotopic mixture. 
D)  pillar. 
E)  shell. 
A)  group. 
B)  period. 
C)  isotopic mixture. 
D)  pillar. 
E)  shell.

Question 8

Which of the following is a metal?

Accepted Answer

A)  nitrogen, N, Z = 7 
B)  phosphorus, P, Z = 15 
C)  arsenic, Z = 33 
D)  thallium, Tl, Z = 81 
E)  silicon, Si, Z = 14 
A)  nitrogen, N, Z = 7 
B)  phosphorus, P, Z = 15 
C)  arsenic, Z = 33 
D)  thallium, Tl, Z = 81 
E)  silicon, Si, Z = 14

Question 9

In the modern periodic table, the order in which the elements are placed is based on

Accepted Answer

A)  atomic mass. 
B)  mass number. 
C)  atomic number. 
D)  atomic size. 
E)  chemical reactivity. 
A)  atomic mass. 
B)  mass number. 
C)  atomic number. 
D)  atomic size. 
E)  chemical reactivity.

Question 10

Which of the following elements are the least reactive?

Accepted Answer

A)  alkali metals 
B)  noble gases 
C)  halogens 
D)  alkaline earth metals 
E)  metalloids 
A)  alkali metals 
B)  noble gases 
C)  halogens 
D)  alkaline earth metals 
E)  metalloids

Question 11

Which of the following compounds is covalent?

Accepted Answer

A)  CaCl2 
B)  MgO 
C)  Al2O3 
D)  Cs2S 
E)  PCl3 
A)  CaCl2 
B)  MgO 
C)  Al2O3 
D)  Cs2S 
E)  PCl3

Question 12

J. J. Thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. His results showed that

Accepted Answer

A)  the mass/charge ratio varied with as the cathode material was changed. 
B)  the charge was always a whole-number multiple of some minimum charge. 
C)  matter included particles much smaller than the atom. 
D)  atoms contained dense areas of positive charge. 
E)  atoms are largely empty space. 
A)  the mass/charge ratio varied with as the cathode material was changed. 
B)  the charge was always a whole-number multiple of some minimum charge. 
C)  matter included particles much smaller than the atom. 
D)  atoms contained dense areas of positive charge. 
E)  atoms are largely empty space.

Question 13

For the element bromine, the symbol, group number, group name and physical state are, respectively

Accepted Answer

A)  Bo, 17, noble gas, gas. 
B)  B, 13, semimetal, solid. 
C)  Br, 17, halogen, liquid. 
D)  Br, 17, halogen, gas. 
E)  Br, 15, chalcogenide, gas. 
A)  Bo, 17, noble gas, gas. 
B)  B, 13, semimetal, solid. 
C)  Br, 17, halogen, liquid. 
D)  Br, 17, halogen, gas. 
E)  Br, 15, chalcogenide, gas.

Question 14

What is the chemical symbol for the group 6A (16) element that lies in period 4?

Accepted Answer

A)  Cr 
B)  Hf 
C)  W 
D)  Ti 
E)  Se 
A)  Cr 
B)  Hf 
C)  W 
D)  Ti 
E)  Se

Question 15

Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

Accepted Answer

A)  S2N4 
B)  S4N2 
C)  4SN2 
D)  S4N 
E)  S2N 
A)  S2N4 
B)  S4N2 
C)  4SN2 
D)  S4N 
E)  S2N

Question 16

Which of the following sets are isoelectronic (i.e., have the same number of electrons)? 
i. Br-, Kr, Sr2+
Ii. C, N-, O2-
Iii. Mg2+, Ca2+, Sr2+
Iv. O2-, O, O2+
V. Ag+, Cd2+, Pd

Accepted Answer

A)  i and ii 
B)  i and v 
C)  i, iii and iv 
D)  ii, iii and v 
E)  i, iii iv and v 
A)  i and ii 
B)  i and v 
C)  i, iii and iv 
D)  ii, iii and v 
E)  i, iii iv and v

Question 17

After an atom has lost an electron it becomes a/an ______ and has a _______ charge.

Accepted Answer

A)  anion, positive 
B)  isotope, negative 
C)  anion, negative 
D)  cation, positive 
E)  nucleus, positive 
A)  anion, positive 
B)  isotope, negative 
C)  anion, negative 
D)  cation, positive 
E)  nucleus, positive

Question 18

Which of the following symbols does not represent an element?

Accepted Answer

A)  O2 
B)  Co 
C)  HF 
D)  Cs 
E)  Xe 
A)  O2 
B)  Co 
C)  HF 
D)  Cs 
E)  Xe

Question 19

Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81,   . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively.

Accepted Answer

A)  35, 46, 81 
B)  35, 81, 46 
C)  81, 46, 35 
D)  46, 81, 35 
E)  35, 81, 116 
A)  35, 46, 81 
B)  35, 81, 46 
C)  81, 46, 35 
D)  46, 81, 35 
E)  35, 81, 116

Question 20

The formula C9H20 is an empirical formula.

Accepted Answer

A) True 
 B)False

Exam 2: The Components of Matter

Sodium peroxide is an oxidizer used to bleach animal and vegetable fibers. What is its formula?

Barium fluoride is used in embalming and in glass manufacturing. Which of the following gives the formula and bonding for barium fluoride?

What is the formula for lead (II) oxide?

Which one of the following formulas of ionic compounds is the least likely to be correct?

The colorless substance, MgF2, is used in the ceramics and glass industry. What is its name?

Bromine has two naturally-occurring isotopes. 79Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

A column of the periodic table is called a

Which of the following is a metal?

In the modern periodic table, the order in which the elements are placed is based on

Which of the following elements are the least reactive?

Which of the following compounds is covalent?

J. J. Thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. His results showed that

For the element bromine, the symbol, group number, group name and physical state are, respectively

What is the chemical symbol for the group 6A (16) element that lies in period 4?

Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

Which of the following sets are isoelectronic (i.e., have the same number of electrons)? i. Br-, Kr, Sr2+ Ii. C, N-, O2- Iii. Mg2+, Ca2+, Sr2+ Iv. O2-, O, O2+ V. Ag+, Cd2+, Pd

After an atom has lost an electron it becomes a/an ______ and has a _______ charge.

Which of the following symbols does not represent an element?

Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81, . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively.

The formula C9H20 is an empirical formula.

Keys to Studying Chemistry Definitions, Units, and Problem Solving

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

The colorless substance, MgF₂, is used in the ceramics and glass industry. What is its name?

Bromine has two naturally-occurring isotopes. ⁷⁹Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

Which of the following sets are isoelectronic (i.e., have the same number of electrons)? i. Br^-, Kr, Sr²⁺ Ii. C, N^-, O^2- Iii. Mg²⁺, Ca²⁺, Sr²⁺ Iv. O^2-, O, O²⁺ V. Ag⁺, Cd²⁺, Pd

After an atom has lost an electron it becomes a/an and has a _ charge.

The formula C₉H₂₀ is an empirical formula.