Question 1

If the density of lead is 11.34 g/cm3, how many atoms are in a piece of lead that is 2.00 cm wide, 1.00 m long, and 2.00 mm thick?

Accepted Answer

A)  1.32 × 1024 atoms 
B)  1.16 × 1023 atoms 
C)  1.32 × 1023 atoms 
D)  1.16 × 1022 atoms 
E)  6.60 × 1023 atoms 
A)  1.32 × 1024 atoms 
B)  1.16 × 1023 atoms 
C)  1.32 × 1023 atoms 
D)  1.16 × 1022 atoms 
E)  6.60 × 1023 atoms

Question 2

Which of the following is a metalloid?

Accepted Answer

A)  mercury 
B)  selenium 
C)  bismuth 
D)  radium 
E)  calcium 
A)  mercury 
B)  selenium 
C)  bismuth 
D)  radium 
E)  calcium

Question 3

Which is the proper chemical symbol for tungsten?

Accepted Answer

A)  Te 
B)  Ti 
C)  Tm 
D)  W 
E)  Tc 
A)  Te 
B)  Ti 
C)  Tm 
D)  W 
E)  Tc

Question 4

A species that differs in charge from another atom of the same element: 
I. is called an isotope
II. has more or less neutrons
III. has lost or gained electrons
IV. is called an ion
V. has the same number of protons

Accepted Answer

A)  I and II 
B)  I and III 
C)  II and IV 
D)  III and IV 
E)  III, IV, V 
A)  I and II 
B)  I and III 
C)  II and IV 
D)  III and IV 
E)  III, IV, V

Question 5

What mass of magnesium is necessary to make 10.5 g of magnesium bromide if 1.04 g of magnesium makes 7.88 g of magnesium bromide?

Accepted Answer

A)  1.39 g 
B)  79.9 g 
C)  1.58 g 
D)  3.66 g 
E)  7.89 g 
A)  1.39 g 
B)  79.9 g 
C)  1.58 g 
D)  3.66 g 
E)  7.89 g

Question 6

An element has 5 stable isotopes. The mass and percentage of each are: 69.9243 20.52%
71)9217 27.43%
72)9234 7.76%
73)9219 36.54%
75)9214 7.76%
The element is which of the following?

Accepted Answer

A)  As 
B)  Se 
C)  Ge 
D)  Ga 
E)  Zn 
A)  As 
B)  Se 
C)  Ge 
D)  Ga 
E)  Zn

Question 7

Lead has 4 stable isotopes with masses of 203.973 (1.48%), 205.9745 (23.6%), 206.9759, and 207.9766 respectively. What are the percentages of the last two isotopes?

Accepted Answer

A)  77% and 23% 
B)  50% and 50% 
C)  37% and 38% 
D)  64% and 11% 
E)  24% and 50% 
A)  77% and 23% 
B)  50% and 50% 
C)  37% and 38% 
D)  64% and 11% 
E)  24% and 50%

Question 8

Magnesium has 3 stable isotopes with masses of 23.98504, 24.98584, and 25.98259 respectively. Mg-25 is 10.13%. What are the percentages of the other two isotopes?

Accepted Answer

A)  78.9% and 10.9% 
B)  50% and 50% 
C)  44.9% and 44.9% 
D)  83.6% and 16.4% 
E)  78.9% and 21.1% 
A)  78.9% and 10.9% 
B)  50% and 50% 
C)  44.9% and 44.9% 
D)  83.6% and 16.4% 
E)  78.9% and 21.1%

Question 9

A 3.214 g sample of magnesium reacts with 8.416 g of bromine. The only product is magnesium bromide. If 1.934 g of magnesium is left unreacted, how much magnesium bromide is formed?

Accepted Answer

A)  1.280 g 
B)  5.202 g 
C)  9.696 g 
D)  7.136 g 
E)  3.268 g 
A)  1.280 g 
B)  5.202 g 
C)  9.696 g 
D)  7.136 g 
E)  3.268 g

Question 10

A cation has 13 neutrons and 10 electrons. If it has a charge of +1, what is its correct symbol?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 11

The total numbers of neutrons, protons, and electrons in 138Ba2+ are ________.

Accepted Answer

A)  138 neutrons, 56 protons, 54 electrons 
B)  82 neutrons, 56 protons, 54 electrons 
C)  56 neutrons, 82 protons, 80 electrons 
D)  82 neutrons, 56 protons, 58 electrons 
E)  82 neutrons, 82 protons, 82 electrons 
A)  138 neutrons, 56 protons, 54 electrons 
B)  82 neutrons, 56 protons, 54 electrons 
C)  56 neutrons, 82 protons, 80 electrons 
D)  82 neutrons, 56 protons, 58 electrons 
E)  82 neutrons, 82 protons, 82 electrons

Question 12

Sodium is a member of the family called ________.

Accepted Answer

A)  alkali metals 
B)  earth alkali metals 
C)  metalloids 
D)  actinide metals 
E)  transition metals 
A)  alkali metals 
B)  earth alkali metals 
C)  metalloids 
D)  actinide metals 
E)  transition metals

Question 13

A 0.920-gram sample of magnesium is allowed to burn in 0.321 g of oxygen gas. The sole product is magnesium oxide. After the reaction, no oxygen remains and 0.809 g of magnesium oxide has been formed. What mass of magnesium is left unreacted?

Accepted Answer

A)  0.210 g 
B)  0.432 g 
C)  1.408 g 
D)  0.111 g 
E)  0.488 g 
A)  0.210 g 
B)  0.432 g 
C)  1.408 g 
D)  0.111 g 
E)  0.488 g

Question 14

The natural abundance of calcium in the earth's crust is 3.4% by mass. How many calcium atoms are present in a 1.50 g sample of the earth's crust?

Accepted Answer

A)  6.6 × 1023 atoms 
B)  3.1 × 1022 atoms 
C)  7.7 × 1020 atoms 
D)  7.7 × 1022 atoms 
E)  5.1 × 1020 atoms 
A)  6.6 × 1023 atoms 
B)  3.1 × 1022 atoms 
C)  7.7 × 1020 atoms 
D)  7.7 × 1022 atoms 
E)  5.1 × 1020 atoms

Question 15

How many moles of Fe is present in 1.2 grams of Fe?

Accepted Answer

A)  2.15 × 10-2 mol 
B)  0.215 mol 
C)  4.30 × 10-2 mol 
D)  2.15 × 10-1 mol 
E)  0.430 mol 
A)  2.15 × 10-2 mol 
B)  0.215 mol 
C)  4.30 × 10-2 mol 
D)  2.15 × 10-1 mol 
E)  0.430 mol

Question 16

J. J. Thomson suggested the "plum pudding" model of the atom.

Accepted Answer

A) True 
 B)False

Question 17

57.7 g Ni contains how many atoms?

Accepted Answer

A)  6.13 × 1023 atoms 
B)  3.47 × 1023 atoms 
C)  5.92 × 1023 atoms 
D)  1.24 × 1024 atoms 
E)  0.983 atoms 
A)  6.13 × 1023 atoms 
B)  3.47 × 1023 atoms 
C)  5.92 × 1023 atoms 
D)  1.24 × 1024 atoms 
E)  0.983 atoms

Question 18

Choose the INCORRECT statement.

Accepted Answer

A)  The Law of Constant Composition is the Law of Definite Proportions. 
B)  Objects of like charge repel each other. 
C)  Electrons were once known as cathode rays. 
D)  Alpha particles are the same mass as a helium nucleus. 
E)  Gamma rays are the same as electrons. 
A)  The Law of Constant Composition is the Law of Definite Proportions. 
B)  Objects of like charge repel each other. 
C)  Electrons were once known as cathode rays. 
D)  Alpha particles are the same mass as a helium nucleus. 
E)  Gamma rays are the same as electrons.

Question 19

All matter is composed of atoms.

Accepted Answer

A) True 
 B)False

Question 20

Choose the information a mass spectrometer is unable to provide.

Accepted Answer

A)  the relative abundance of two isotopes of potassium 
B)  the number of protons in potassium 
C)  the atomic mass of a single isotope of potassium 
D)  the mass of a proton 
E)  the number of stable isotopes of potassium 
A)  the relative abundance of two isotopes of potassium 
B)  the number of protons in potassium 
C)  the atomic mass of a single isotope of potassium 
D)  the mass of a proton 
E)  the number of stable isotopes of potassium

Exam 2: Atoms and the Atomic Theory

If the density of lead is 11.34 g/cm3, how many atoms are in a piece of lead that is 2.00 cm wide, 1.00 m long, and 2.00 mm thick?

Which of the following is a metalloid?

Which is the proper chemical symbol for tungsten?

A species that differs in charge from another atom of the same element: I. is called an isotope II. has more or less neutrons III. has lost or gained electrons IV. is called an ion V. has the same number of protons

What mass of magnesium is necessary to make 10.5 g of magnesium bromide if 1.04 g of magnesium makes 7.88 g of magnesium bromide?

An element has 5 stable isotopes. The mass and percentage of each are: 69.9243 20.52% 71)9217 27.43% 72)9234 7.76% 73)9219 36.54% 75)9214 7.76% The element is which of the following?

Lead has 4 stable isotopes with masses of 203.973 (1.48%), 205.9745 (23.6%), 206.9759, and 207.9766 respectively. What are the percentages of the last two isotopes?

Magnesium has 3 stable isotopes with masses of 23.98504, 24.98584, and 25.98259 respectively. Mg-25 is 10.13%. What are the percentages of the other two isotopes?

A 3.214 g sample of magnesium reacts with 8.416 g of bromine. The only product is magnesium bromide. If 1.934 g of magnesium is left unreacted, how much magnesium bromide is formed?

A cation has 13 neutrons and 10 electrons. If it has a charge of +1, what is its correct symbol?

The total numbers of neutrons, protons, and electrons in 138Ba2+ are ________.

Sodium is a member of the family called ________.

A 0.920-gram sample of magnesium is allowed to burn in 0.321 g of oxygen gas. The sole product is magnesium oxide. After the reaction, no oxygen remains and 0.809 g of magnesium oxide has been formed. What mass of magnesium is left unreacted?

The natural abundance of calcium in the earth's crust is 3.4% by mass. How many calcium atoms are present in a 1.50 g sample of the earth's crust?

How many moles of Fe is present in 1.2 grams of Fe?

J. J. Thomson suggested the "plum pudding" model of the atom.

57.7 g Ni contains how many atoms?

Choose the INCORRECT statement.

All matter is composed of atoms.

Choose the information a mass spectrometer is unable to provide.

Matter - Its Properties and Measurement

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 I: Groups 1, 2, 13, and 14

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

The total numbers of neutrons, protons, and electrons in 138Ba²⁺ are ________.